Squoosh
Compress and convert images in the browser, with a slider that shows the quality loss as you make the file smaller.
Cost
Completely free
Completely free. Built by Google's Chrome team.
Open source
Yes
The code is public. Anyone can inspect it, and it cannot be taken away from you.
Your data
Stays on your computer
Nothing is uploaded. This matters for anything confidential.
Use it for this
Getting a photo under an upload limit without it turning to mush. The side-by-side view means you can see exactly how far you can push it before it looks bad.
Do not use it for this
Batches of hundreds of images, or editing the picture itself.
A moment where you would reach for it
Shrinking a 6 MB phone photo to 400 KB for a form that rejects anything over 1 MB.
How hard is it to pick up?
Anyone can use this on day one.
Worth knowing before you use it
Runs entirely in your browser. The image is never uploaded anywhere — you can prove it by turning off your internet after the page loads and watching it still work.
Other things that do this job
No tool is best at everything. These solve a similar problem, with different trade-offs.
About this entry
Checked on 1 Sept 2026. Prices and free limits change without warning, and often quietly. Treat everything above as a starting point and confirm on the official site before you rely on it.
Nothing here is sponsored. A tool appears because it solves a real problem, not because someone paid for it to be listed.