What Squoosh is
Squoosh (squoosh.app) is a free, open-source image compression tool built by the Chrome team. It runs entirely in the browser via WebAssembly, so images never leave your device, and it supports WebP and AVIF alongside classic formats, with a live before/after slider.
FlexiWebP vs Squoosh
| FlexiWebP | Squoosh | |
|---|---|---|
| Batch processing | Drop in a whole folder, convert all at once | One image at a time |
| Requires a browser tab | No, native app | Yes |
| Watermarking | Add a text watermark during export | Not available |
| Output formats | WebP and AVIF | WebP, AVIF, and several others |
| Price | One-time purchase | Free |
When Squoosh might be the better choice
If you're converting one image now and then, Squoosh is free, has no install step, and supports a wider range of output formats. It's also genuinely private, everything happens client-side in your browser, nothing is uploaded.
When FlexiWebP fits better
If you regularly convert whole folders, product photos, a blog's image library, a batch export from a design tool, doing it one file at a time in a browser tab gets old fast. FlexiWebP handles the folder at once and adds a watermark option Squoosh doesn't have.
Convert a folder at once, not one file at a time
FlexiWebP batch-converts to WebP and AVIF on your Mac, no browser tab required.
Scan with your iPhone to install FlexiWebP
View on the App StoreFrequently asked questions
Is Squoosh safe to use for private photos?
Yes, Squoosh processes images locally in your browser and does not upload them to a server.
Can FlexiWebP open Squoosh's output files?
Yes, both produce standard WebP and AVIF files readable by any app that supports those formats.
Does FlexiWebP work without an internet connection?
Yes, it's a native Mac app and needs no connection to convert files.