2026-09-03
Squoosh and image-compressor-saas.shop are both free, run entirely in your browser, and never upload your images. Under the hood they are similar; as workflow tools they are opposites. Squoosh is Google's open-source playground for perfecting one image. This site is built to finish a stack of images fast. This comparison is deliberately fair: real strengths on both sides, real compression numbers from the same test photo, and a clear rule for which one to pick.
If you want the wider landscape first, we compared five alternatives in our TinyPNG alternatives roundup (/blog/best-tinypng-alternative-free), including Squoosh, ImageOptim, and Kraken.io.
Compressing a single image and want to fine-tune encoders by hand? Use Squoosh. Processing dozens of images, aiming for a specific size like "under 100KB", or repeating the same job every week? Use this site. Both are free and private, there is no switching cost, and honestly you should bookmark both.
For tasks like "this hero image matters, squeeze the best quality out of 300KB", Squoosh's manual control and visual comparison are genuinely the best you can get.
The trade-off is per-image finesse: no encoder-by-encoder tuning, no comparison slider. Our bet is that most people want fast and consistent, not a microscope.
Test sample: one 4032×3024 phone photo, 3.4 MB as-shot JPEG. Same device, same image, only the tool and settings changed:
As expected: at comparable quality settings the output sizes are the same order of magnitude — neither tool has magic math. The real gap is workflow. For one image versus forty, the hands-on time differs by more than 20x.
As of September 2026, the official Squoosh app processes one image at a time with no batch mode. For batches you need a different tool, or its command-line cousin libsquoosh.
No. Squoosh compresses in browser WASM, and image-compressor-saas.shop also compresses 100% locally in your browser. Files never leave your device with either one.
At equal visual quality WebP usually lands 20–30% smaller than JPEG, and all modern browsers support it. Stick with JPEG for old systems or email attachments.
The tool adjusts quality iteratively, measures the output size after each pass, and converges on your target. That search makes each run slightly slower than a fixed-quality preset.
This is not a zero-sum comparison. Squoosh perfects the art of the single image; this site compresses the time cost of a hundred images into a few seconds. Treat them as tools for two different jobs rather than rivals: fine-tune in Squoosh, mass-produce in image-compressor-saas.shop. And if you want to understand why any of this matters for your traffic, read our guide to how image compression affects page speed (/blog/image-compression-affects-page-speed) and the LCP fix walkthrough (/blog/core-web-vitals-fix-lcp-images).