Compress image
Make a picture small enough to email, attach or put on a web page, while still looking good. You see the original and the result side by side with both file sizes, so you decide how far to push it. Your picture never leaves your computer.
How to use it
- 1 Drop one or more images onto the page, or click to pick them.
- 2 Choose a quality level, or name a size you need to hit and let it find the setting that gets there.
- 3 Compare the preview against the original at full zoom.
- 4 Download the compressed images individually or as a ZIP.
Formats this tool accepts
Each one has a reference page covering what it stores and where it is supported.
Questions about compress image
How much smaller will my image get?
For a photograph, a quality setting around 75 typically lands between a quarter and a half of the original size with no difference most people can see. Screenshots, logos and flat graphics behave differently: they compress much better as PNG or lossless WebP than as JPEG, and pushing lossy quality down on them produces visible ringing around text long before the file gets meaningfully smaller.
Does compressing lose quality?
Lossy compression always discards some information, but below a certain point the discarded information is detail your eye was not going to resolve anyway. The tool shows you the result before you download, and if you need a guaranteed pixel-identical file you can compress losslessly instead and accept a smaller saving.
Why did my file get bigger?
That usually means the source was already compressed harder than the setting you chose, so the encoder is spending more bits than the original did. It also happens converting a small palette image into a full colour format. Lower the quality, or keep the original if it is already smaller.
Are my files uploaded to a server?
No. The whole thing runs inside the browser tab you already have open. Your file is read straight from your own disk, worked on there, and handed back as a download. Nothing is sent anywhere, nothing is stored, and there is no account and no queue.
Is there a file size limit?
There is no server-side limit because there is no server. The practical ceiling is your device memory, since the file and its output both have to fit in the tab. Files up to a few hundred megabytes are usually fine on a desktop machine, while phones and older laptops will struggle sooner. If a large file fails, close other tabs and try again.
Does it work offline?
Yes, once the page has loaded once. The engine is cached by the browser, so you can turn off your connection, reload the page and keep working. That is a useful side effect of doing the processing locally rather than a separate offline mode you have to enable.
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