Compress images online
Drop in JPG, PNG or WebP images and shrink them in seconds. Adjust quality, optionally resize, compare sizes and download individually or as a ZIP. Images are never uploaded.
Runs in your browser. Your files are never uploaded.
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How to use Image Compressor
- Drop images onto the page or press “Add images”.
- Set the quality and, if you like, a maximum width or height.
- Download each image, or press “Download all (ZIP)”.
Why compress images?
Images are usually the heaviest part of a web page and of an email. Large photos slow websites down, hurt search rankings through poor page-speed scores, use mobile data, and hit upload size limits on forms and job portals. Compressing an image reduces its file size, often dramatically, while keeping it looking almost the same.
Lossy and lossless: how it works
JPG and WebP use lossy compression. They discard fine detail the eye barely notices, and the quality slider controls how much. Around 70–80% is usually the sweet spot for photos: files shrink by half or more with little visible change.
PNG is normally lossless, so it cannot be shrunk much by a quality setting alone. This tool applies colour quantisation, the same idea TinyPNG uses: it reduces the picture to a smaller palette of colours, which cuts PNG size sharply for screenshots, logos and illustrations while keeping transparency.
Which format should you choose?
- Photos: WebP is usually smallest, JPG is the most compatible.
- Screenshots, logos and graphics with flat colour or text: PNG, or WebP if the destination supports it.
- Images that need transparency: PNG or WebP, never JPG, because JPG has no transparent background and the tool fills it with white.
- Not sure: leave the format on “Keep original” and just adjust quality.
Practical size targets
- Web page images: aim for under 200 KB, and resize to the width actually displayed. Setting a maximum width of 1600 px is enough for most layouts.
- Email: keep the total under about 10 MB.
- Forms with a limit such as 100 KB: lower the quality in steps of 5–10% and set a smaller maximum width until the result fits.
Private and batch-friendly
Compression runs in your browser using the Canvas API. Your photos are never uploaded, which matters for personal pictures and ID documents. You can add many images at once, see before-and-after sizes for each, and download them individually or all together as a ZIP. Keep your originals: compression changes the pixels and cannot be undone.
Why use this image compressor tool
- JPG, PNG and WebP. PNG is optimised with colour quantisation, similar to TinyPNG.
- Batch processing. Compress many images at once and download a ZIP.
- Resize and convert. Limit dimensions or convert to WebP for the smallest size.
- Private. Compression runs on your device, so photos are never uploaded.
Frequently asked questions
How much can an image be compressed?
Photos often shrink 50–90%. Results vary with the image; screenshots and flat graphics compress well as PNG.
Does compression reduce quality?
A little, by design. At the default quality the difference is rarely visible, and you can raise quality if you need to.
Are my photos uploaded to a server?
No. Everything is processed in your browser.
Which format is smallest?
WebP is usually smallest, then JPG for photos. Keep PNG when you need transparency.