RSRobince Studio

Free online tools

Simple utilities for everyday work. Everything runs in your browser, so your files and data stay on your device. No sign-up, no watermarks.

PDF Tools

PDF Merge

Combine multiple PDF files into one document in seconds. Free, no sign-up, no watermark, and your files never leave your device.

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PDF Editor

Edit PDFs in your browser: add text and images, white-out content, rotate, reorder or delete pages. Free, private, no upload.

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JPG to PDF Converter

Convert JPG, PNG and WebP images into a single PDF. Reorder pages, choose A4, Letter or fit-to-image size. Free and private.

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Split PDF

Split a PDF by page ranges, into single pages, or every N pages. Download as separate PDFs in a ZIP. Free, private, no upload.

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PDF to JPG

Convert PDF pages to JPG or PNG images in your browser. Choose resolution and quality, pick pages, download one image or a ZIP. Files never leave your device.

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Rotate PDF

Rotate PDF pages 90, 180 or 270 degrees. See thumbnails, turn single pages or the whole document, then save a fixed PDF. Private, in your browser.

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Compress PDF

Shrink a PDF in your browser: rebuild pages as compressed images for big savings, or tidy structure only. Shows before and after size. No upload.

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Delete PDF Pages

Remove unwanted pages from a PDF or keep only the pages you choose. Click thumbnails to select, then save a new PDF. Runs privately in your browser.

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Add Page Numbers to PDF

Add page numbers to a PDF with your choice of position, format, start number and font size. Skip the cover page. Works fully in your browser.

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Watermark PDF

Add a text watermark such as CONFIDENTIAL or DRAFT to every PDF page. Set size, opacity, rotation and colour. Latin text only; runs in your browser.

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PDF to Text

Extract the text from a PDF page by page, then copy it or download a .txt file. Works in your browser. Scanned PDFs have no text layer and need OCR.

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Sign PDF

Sign a PDF in your browser: draw, type or upload a signature, add initials, a date or text, drag it into place and download. Nothing is uploaded.

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Redact PDF

Redact a PDF in your browser: draw boxes over sensitive areas, flatten pages to remove the hidden text for real, and verify with a text-extraction check.

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Fill PDF Form

Fill in a fillable PDF form in your browser. Every field gets a proper input, with live page preview, optional flatten and save. Nothing is uploaded.

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Flatten PDF

Flatten a PDF online: bake form fields into the page, or rasterise pages to also lock comments and markup. See before and after size. No upload needed.

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PDF Metadata Editor

View and edit PDF metadata: title, author, subject, keywords, creator, producer and dates. One click removes it all. Runs privately in your browser.

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Crop PDF

Crop PDF pages in your browser. Drag a crop frame, set exact margins in mm, inches or points, auto-detect white borders and apply to one or all pages.

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Reorder PDF Pages

Rearrange PDF pages by dragging thumbnails. Select several pages, duplicate, delete, reverse, merge odd and even scans, undo moves and save a new PDF.

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Text to PDF

Turn pasted text or a .txt or .md file into a PDF. Choose A4, Letter or Legal, margins, font, size and spacing, add page numbers and see the page count live.

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Image Tools

Image Compressor

Reduce image file size up to 90% without visible quality loss. Compress JPG, PNG and WebP in your browser. Free, private, batch download.

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Crop Image

Crop any photo online with a drag-to-select box and presets for 1:1, 4:3 and 16:9. Works on phones, runs in your browser, so your image is never uploaded.

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Rotate & Flip Image

Rotate an image 90, 180 or 270 degrees or flip it horizontally or vertically, then download it as PNG or JPG. Free, instant and done in your browser.

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Image to Base64

Convert an image to a Base64 string or data URL to embed in HTML, CSS or JSON. Copy it, see the size overhead, and keep your file private in the browser.

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Base64 to Image

Paste a Base64 string or data URL and see the decoded image instantly. The file type is detected from its bytes, and you can download it. Private, no upload.

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Remove EXIF Metadata

Strip EXIF data, GPS location and camera details from JPG, PNG and WebP photos. Re-saves the image on a clean canvas in your browser, showing file sizes.

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Color Picker from Image

Click any pixel of a photo to get its HEX and RGB colour, build a palette, and see the six dominant colours of the image. Runs in your browser, no upload.

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Favicon Generator

Make a complete favicon set from one image: 16, 32, 48, 180, 192 and 512 pixel PNGs plus favicon.ico, bundled in a ZIP with the HTML link tags to paste.

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Watermark Image

Add a text watermark to a photo with adjustable position, size, colour and opacity, or tile it across the image. Download PNG or JPG. Private, in-browser.

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SVG to PNG

Convert SVG code or files to PNG at 1x to 4x scale with a transparent or coloured background. Rendered safely as an image, entirely in your browser.

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Blur & Pixelate Image

Blur, pixelate or black out faces, plates, names and numbers in a photo or screenshot. Draw boxes, adjust strength, download. Runs in your browser.

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HEIC to JPG Converter

Convert HEIC and HEIF photos from iPhone to JPG or PNG online. Batch convert, set JPG quality, and download a ZIP. Files stay on your device.

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Image Resizer

Resize JPG, PNG and WebP images to exact pixel dimensions or a percentage while keeping the aspect ratio. Free, private and no upload.

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Image Converter (PNG, JPG, WebP)

Convert images between PNG, JPG and WebP in bulk. Adjust quality and download as a ZIP. Free and private, with no upload.

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JSON & Data Tools

JSON Formatter

Format, validate, beautify and minify JSON instantly. Shows the exact line and column of any error. Free and runs in your browser.

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JSON to CSV

Convert a JSON array to CSV in your browser. Flattens nested objects, picks delimiters and downloads a ready .csv for Excel or Sheets.

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CSV to JSON

Convert CSV to JSON in your browser. Auto-detects delimiter, uses the header row as keys, and can convert numbers and booleans.

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JSON to XML Converter

Convert JSON to well-formed XML online with a custom root element, proper escaping and pretty printing. Runs in your browser; your data is never uploaded.

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XML to JSON Converter

Convert XML to JSON online using your browser’s own XML parser. Attributes become @keys, text becomes #text and repeated tags become arrays. Private and free.

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JSON Diff

Compare two JSON documents and see added, removed and changed paths in colour. Key order is ignored, so only real differences are reported. Free and private.

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JSON to TypeScript

Generate TypeScript interfaces or types from sample JSON. Handles nested objects, arrays, optional keys, null and unions. Free and private, in-browser.

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JSONPath Tester

Test JSONPath expressions against your JSON. See every match with its path. Supports $, ., [], [*], .., slices and simple filters. Free and private.

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XML Formatter & Validator

Format, indent, minify and validate XML online. Reports well-formedness errors from the browser’s XML parser. Private, free and no sign-up needed.

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SQL Formatter

Format and beautify SQL queries online for standard SQL, MySQL, PostgreSQL, SQLite, BigQuery and more. Choose keyword case and indent, or minify. Private.

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CSV Delimiter Converter

Convert between comma, semicolon, tab and pipe separated files. Auto-detects the delimiter, handles quoted fields, shows a preview. Free and private.

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CSV Viewer

Open a CSV file and browse it as a sortable, searchable table with row counts and 100-row paging. Download the filtered rows. Private; nothing is uploaded.

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Excel to CSV Converter

Convert .xlsx sheets to CSV in your browser. Preview rows, pick a sheet, set delimiter and BOM, or export all sheets as ZIP. Files stay on your device.

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YAML to JSON Converter

Convert YAML to JSON instantly with clear error messages. Pretty-printed output, file upload and download. Free and private.

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JSON to YAML Converter

Convert JSON to clean, readable YAML instantly. Choose indent size, copy or download the result. Free and runs in your browser.

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Text Tools

Word Counter

Count words, characters, sentences and paragraphs instantly. Also shows reading time, speaking time and your most-used keywords. Free and private.

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Case Converter

Convert text to uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case and more in one click. Free, runs in your browser.

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Lorem Ipsum Generator

Generate lorem ipsum placeholder text by paragraphs, sentences or words. Copy in one click for mockups, designs and templates. Free and instant.

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Text Diff Checker

Compare two blocks of text side by side and see added and removed lines highlighted. Ignore case and spaces. Free, private, runs in your browser.

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Remove Duplicate Lines

Remove duplicate lines from any list instantly. Keeps the first occurrence, with options to ignore case, trim spaces and drop blank lines.

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Sort Lines

Sort lines of text alphabetically A–Z or Z–A, numerically, by length, reverse the order or shuffle randomly. Free online line sorter.

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Slug Generator

Turn titles into clean URL slugs. Removes accents and symbols, uses hyphens or underscores, and supports a maximum length. Free SEO slug maker.

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Remove Extra Spaces

Remove extra spaces, trim every line, delete blank lines and strip line breaks from pasted text. Free, instant and private; nothing leaves your browser.

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Text to Speech

Turn typed or pasted text into speech using your browser’s built-in voices. Choose voice, speed, pitch and volume, with play, pause and stop controls.

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Reverse Text

Reverse text by characters, word order, each word or line order. Handles emoji and accented letters safely. Free, instant and works in your browser.

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Find and Replace Text

Find and replace text in bulk with plain search or regular expressions. Match case, whole word, capture groups and a live replacement count. Free and private.

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Markdown to HTML Converter

Convert Markdown to clean HTML with a live, sanitised preview. Copy the raw HTML output for blogs, emails or your site. Free and runs in your browser.

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HTML to Markdown Converter

Convert HTML to Markdown with options for heading style, bullet markers and code blocks. Paste a web snippet and copy tidy Markdown. Runs in your browser.

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Text to Binary & Morse Code Translator

Translate text to binary, hex or Morse code and back again. Supports A-Z, 0-9 and punctuation, plus UTF-8 for any language. Free and private.

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Developer Tools

PX to REM Converter

Convert pixels to rem and em, and back, with a custom root font size. Includes a table of common sizes from 8px to 64px and a copy-ready CSS declaration.

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Base64 Encode & Decode

Encode text to Base64 or decode Base64 back to text. Supports UTF-8 and URL-safe Base64. Free, instant and runs in your browser.

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URL Encode & Decode

Encode or decode URLs and query strings with percent-encoding. Choose component or full-URL mode. Free, instant and private.

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UUID Generator

Generate random version 4 UUIDs (GUIDs) in bulk. Copy one or hundreds, in uppercase or without hyphens. Uses your browser’s secure random generator.

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Hash Generator (SHA-256)

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes for text or files. Verify downloads and checksums. Runs locally in your browser.

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JWT Decoder

Decode a JWT to read its header, payload and expiry time. Free and runs locally, so your token is never sent to a server.

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Regex Tester

Test JavaScript regular expressions live. See matches highlighted, capture groups and indexes, with flags for global, case-insensitive and more.

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Unix Timestamp Converter

Convert Unix timestamps (seconds or milliseconds) to human-readable dates and back. Shows UTC, ISO 8601 and local time. Live current epoch.

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Color Converter

Convert colours between HEX, RGB and HSL with a live preview and colour picker. Copy ready-to-use CSS values. Free web colour converter.

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HTML Entities Encode/Decode

Encode special characters to HTML entities or decode named and numeric entities back to text. Named, decimal and hex output. Safe and private in your browser.

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CSS Minifier & Beautifier

Minify CSS by removing comments and whitespace, see the exact percentage saved, or switch to beautify mode to format compressed stylesheets. Private, instant.

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JavaScript Minifier

Minify JavaScript in your browser with Terser: mangle names, compress code, drop console calls, see size saved and get clear syntax errors with line numbers.

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HTML Minifier

Minify HTML by removing comments and collapsing whitespace between tags, while leaving pre, textarea, script and style content untouched. Shows bytes saved.

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CSS Gradient Generator

Build linear, radial and conic CSS gradients with up to five colour stops, angle and position controls, a live preview and copy-ready CSS code.

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Box Shadow Generator

Create CSS box-shadow code with multiple layers, inset shadows, blur, spread, colour and opacity controls and a live preview. Copy the CSS in one click.

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Cron Expression Explainer

Translate any 5-field cron expression into plain English, validate it, and see the next five run times in your time zone or UTC. Includes handy presets.

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Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal and any custom base from 2 to 36. Two-way live fields, BigInt precision and input validation.

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Chmod Calculator

Tick read, write and execute boxes for owner, group and others to get the chmod octal number and symbolic form. Includes setuid, setgid, sticky and presets.

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Meta Tag Generator

Generate copy-ready HTML meta tags: title, description, canonical, robots, Open Graph and Twitter card, with live character counters and a Google preview.

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Generators

Typing Speed Test

Test your typing speed in 15, 30 or 60 seconds with fresh sentences. See live WPM, raw WPM, accuracy and highlighted mistakes. Free and runs in your browser.

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Password Generator

Generate strong random passwords with custom length and characters. Uses your browser’s cryptographic randomness; nothing is sent or stored.

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QR Code Generator

Create QR codes for URLs, text or Wi-Fi. Custom colours and size, error correction levels, free PNG and SVG download. No watermark or expiry.

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Barcode Generator

Create barcodes in Code 128, EAN-13, EAN-8, UPC-A, Code 39 and ITF-14 with automatic check digits. Free PNG and SVG download, made in your browser.

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Random Number Generator

Generate random numbers between any min and max. Pick how many, allow or forbid repeats, use decimals. Unbiased and based on cryptographic randomness.

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Random Name Picker Wheel

Paste a list of names, spin the wheel and pick a fair random winner. Option to remove winners, winner history, and reduced-motion support. Free and private.

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Dice Roller & Coin Flip

Roll one or many dice from d4 to d20 with sum and history, or flip a coin and keep a heads and tails tally. Fair, instant and free in your browser.

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Passphrase Generator

Generate memorable multi-word passphrases from a 512-word list with honest entropy in bits. Choose word count, separator, capitals and a number. Private.

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Finance Calculators

Mortgage Calculator

Work out your monthly mortgage payment from price, down payment, rate and term, with optional tax, insurance and HOA, total interest and a yearly payoff table.

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Simple Interest Calculator

Calculate simple interest and the total amount from principal, annual rate and time in years, months or days. Shows the formula and a worked example.

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Inflation Calculator

See what today’s money will cost in future, or how much purchasing power an amount keeps, using your own annual inflation rate and number of years.

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CAGR Calculator

Calculate CAGR from a beginning value, ending value and years, or solve the ending value from a CAGR. Includes the formula and a worked example.

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ROI Calculator

Calculate return on investment from cost and final value, include fees, and see annualised ROI for a holding period. Shows the formula and an example.

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Profit Margin Calculator

Find profit, profit margin percentage and markup from cost and price, or work out the selling price you need for a target margin or markup in seconds.

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VAT Calculator

Add VAT or sales tax to a net price, or remove it from a gross price, using any rate you enter. Shows net, tax and gross amounts with the formulas.

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Salary Converter

Convert pay between hourly, daily, weekly, monthly and annual figures using your own hours per week, days per week and paid weeks per year, free online.

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Tax Bracket Calculator

Estimate progressive tax with your own brackets. Enter limits, rates and a deduction to see tax per bracket, effective rate, marginal rate and take-home.

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Home Loan EMI Calculator

Work out home loan EMI, total interest and cost with processing fee, then test extra monthly or one-time prepayments. Includes yearly and monthly schedules.

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Home Loan Eligibility Calculator

Estimate the maximum home loan you may qualify for from income, existing EMIs and an editable FOIR percentage. See how tenure changes the eligible amount.

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Loan Prepayment Calculator

See how a part-prepayment on an existing loan saves interest, comparing keeping your EMI to finish sooner against lowering the EMI over the same term.

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Car Loan Calculator

Calculate car loan EMI from on-road price, down payment, financed extras like insurance, rate, tenure and an optional balloon (residual) payment at the end.

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Personal Loan Calculator

Calculate personal loan EMI and total payable including processing fee, fixed charges and tax on fees, plus the effective annual rate (IRR) of the real cost.

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Flat vs Reducing Interest Calculator

Convert a flat interest rate to the equivalent reducing-balance rate (IRR) and compare EMIs and total interest side by side. See why flat looks cheaper.

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Loan Comparison Calculator

Compare two or three loan offers by EMI, total interest, processing fee and total cost. The cheapest is highlighted and the difference is shown in money.

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Credit Card Payoff Calculator

See how long a credit card balance takes to clear, the interest you pay, and the payment needed for a target month. Shows the minimum-payment trap.

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FD Calculator

Fixed deposit calculator with cumulative or periodic payout, monthly to yearly compounding, maturity date, optional TDS and a year-wise growth table.

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RD Calculator

Recurring deposit calculator: enter monthly deposit, rate and tenure to see maturity value, total deposited, interest and a quarterly or monthly table.

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PPF Calculator

PPF calculator with 15-year tenure, 5-year extension blocks, deposit at start or end of year, your own rate and a year-by-year balance table.

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Lumpsum Calculator

Lumpsum investment calculator: future value, absolute and annualised gain, an optional inflation-adjusted value, and a year-by-year growth table.

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Step-Up SIP Calculator

Step-up SIP calculator: monthly SIP that rises by a yearly percentage, with total invested, estimated value, gain and a year-wise growth table.

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SWP Calculator

SWP calculator: see your remaining balance each year, the month a corpus runs out and the effect of raising withdrawals yearly, at your expected return.

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NPS Calculator

NPS calculator: monthly contribution, expected return and retirement age to estimate corpus, lump sum, annuity amount and monthly pension. Editable rules.

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Retirement Calculator

Estimate the retirement corpus you need and the monthly investment required, using inflation-adjusted expenses and editable return assumptions. Free, private.

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Savings Goal Calculator

Find the monthly saving needed to hit a target amount, or how long it takes at a set monthly saving. Optional inflation adjustment and editable return.

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Gratuity Calculator

Estimate gratuity with the statutory formula (last drawn salary x 15 x years of service / 26), including the over-six-months rounding rule. Free and private.

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Rule of 72 Calculator

Find how many years it takes to double money at a rate, or the rate needed to double in N years, with exact ln(2) maths beside the 72, 70 and 69.3 rules.

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XIRR Calculator

Calculate XIRR for irregular investments and withdrawals. Paste dated cash flows from a spreadsheet, get the annual rate and absolute gain instantly.

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Break-Even Calculator

Find break-even units and revenue from fixed costs, price and variable cost. See contribution margin, margin of safety and a cost versus revenue chart.

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EMI Calculator

Calculate monthly EMI for home, car or personal loans. See total interest, total payment and a year-by-year amortization table. Free and instant.

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GST Calculator

Add GST to a price or remove it from a GST-inclusive amount. Shows net amount, GST, CGST/SGST split and IGST for 5%, 12%, 18% and 28% slabs.

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Compound Interest Calculator

Calculate compound interest with monthly contributions and your choice of compounding frequency. See a year-by-year table and growth chart. Free, no sign-up.

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SIP Calculator

Estimate the future value of a monthly SIP from your amount, expected return and years. Compare invested money with estimated returns, with optional step-up.

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Tip Calculator

Work out the tip and total for any bill, split it between people and optionally round up the total or each share. Quick presets for 10 to 25 percent.

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Discount Calculator

Find the sale price after a percentage discount, add a second stacked discount and sales tax, and see exactly how much you save. Free and instant.

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Calculators

Calorie and BMR Calculator

Estimate your basal metabolic rate with the Mifflin-St Jeor equation, daily calories for your activity level, and calorie targets for losing or gaining weight.

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Pregnancy Due Date Calculator

Estimate your due date from the first day of your last period (with cycle length) or conception date, see weeks pregnant today and trimester dates.

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Fraction Calculator

Free fraction calculator for mixed numbers and fractions. Add, subtract, multiply or divide and get the simplified fraction, mixed number, decimal and steps.

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GPA Calculator

Calculate semester and cumulative GPA on a 4.0 scale with plus and minus grades, credit hours and an editable grade point scale. Free and private.

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CGPA to Percentage Calculator

Convert CGPA on a 10-point scale to percentage with the common 9.5 multiplier or your own, and convert percentage back to CGPA. Free and instant.

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Ratio Calculator

Free ratio calculator: simplify ratios to lowest terms, scale a ratio to a known value, and solve proportions A:B = C:X with the formula shown.

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Quadratic Equation Solver

Solve ax² + bx + c = 0 for real or complex roots. See the discriminant, vertex, axis of symmetry and step-by-step working. Free and runs in your browser.

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Prime Number Checker

Check whether a number up to 2^53 is prime, see its smallest factor and prime factorisation, or list all primes up to 1,000,000 with a sieve.

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GCD & LCM Calculator

Find the greatest common divisor (HCF) and least common multiple of 2 to 10 numbers, with prime factorisations and Euclidean algorithm steps shown.

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Standard Deviation Calculator

Calculate sample and population standard deviation, variance, mean, sum and count from a list of numbers, with a step-by-step table of deviations.

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Permutation & Combination Calculator

Calculate nPr and nCr exactly with big integers, with or without repetition, and see the factorial working. Handles values of n and r up to 10,000.

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Pythagorean Theorem Calculator

Solve any missing side of a right triangle with a² + b² = c². Also gives area, perimeter, both acute angles and a labelled diagram. Free and instant.

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Area and Perimeter Calculator

Find the area and perimeter of a rectangle, square, triangle, circle, trapezoid, parallelogram or ellipse in your chosen unit, with the formula shown.

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Aspect Ratio Calculator

Find the simplified aspect ratio of any width and height, then scale to a new width or height while keeping proportions. Includes 16:9, 4:3 and 21:9 presets.

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Download Time Calculator

Estimate how long a download takes from file size and connection speed in Mbps or MB/s, and see how much data video streaming uses at a given bitrate.

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Fuel Cost Calculator

Work out trip fuel cost, litres used and cost per km from distance, efficiency (km/L, L/100km, mpg) and fuel price. Split the cost and convert units.

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Time Duration Calculator

Add or subtract time durations in hh:mm:ss, sum a list of durations for timesheets, and convert between h:mm:ss and decimal hours. Free and private.

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Day of the Week Calculator

Find the day of the week for any date from year 100 to 9999, plus the day of the year, ISO week number, leap year status and days left in the year.

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Days Until Date Calculator

Count down the days, hours, minutes and seconds to any date, with presets like New Year and Christmas. Share the countdown with a link; nothing is stored.

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Percentage Calculator

Calculate percentages instantly: what is X% of Y, X is what percent of Y, and percentage increase or decrease. Free online calculator.

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Age Calculator

Calculate your exact age in years, months and days from your date of birth, plus total days lived and days until your next birthday.

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BMI Calculator

Calculate your body mass index from height and weight in metric or imperial units and see which adult category it falls in.

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Date Difference Calculator

Find the number of days, weeks, months and years between two dates, count business days, or add and subtract days, weeks, months or years from a date.

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Scientific Calculator

Free online scientific calculator with brackets, powers, roots, sin, cos, tan in degrees or radians, log, ln, factorial, pi and e. Keyboard input and history.

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Average & Grade Calculator

Find the mean, median, mode, range and standard deviation of a list of numbers, then calculate a weighted grade and the score you need on your final.

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Converters

Cooking Measurement Converter

Convert cups, spoons, ml, ounces and grams for 25 common ingredients such as flour, sugar, butter and rice. Approximate values, with US and metric cups.

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Currency Converter

Convert between 30 major currencies including USD, EUR, GBP and INR using European Central Bank reference rates. Works offline with saved rates.

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Unit Converter

Convert between units of length, mass, volume, area, speed, time, data and temperature. See every result at once. Free online converter.

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Time Zone Converter

Pick a date and time in any IANA time zone and see it in several other zones at once. Daylight saving aware, with 12 or 24-hour display. Free, private.

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Stopwatch & Countdown Timer

A free online stopwatch with lap times and a countdown timer with presets and an alarm beep. Accurate, timestamp-based timing that works in your browser.

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World Clock

See the live current time in any cities or time zones you choose, with date, UTC offset and hours difference from you. Your list is saved in your browser.

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Number to Words Converter

Convert numbers to English words, up to 999,999,999,999 with decimals. Optional capitalisation, “and” and Indian lakh/crore style. Free and instant.

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Roman Numeral Converter

Convert numbers 1 to 3999 into Roman numerals and Roman numerals back into numbers, with validation of improper forms. Free, instant and private.

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Private by design

Unlike many online converters, these tools do not upload your documents or images. PDF merging, JSON formatting, CSV conversion and image compression are all done locally using your browser, which is faster and keeps sensitive files private.