In-browser compression
OpusImg vs Squoosh
Squoosh is Google's open-source in-browser image compressor, and it is the closest thing to OpusImg's compression philosophy on the web. If you only need to compress one image and you want to see exactly what the encoder is doing, it is excellent and you should use it.
Claims about Squoosh on this page were checked against their own live pages on . Pricing and limits change — verify anything you are about to act on.
Side by side
| OpusImg | Squoosh | |
|---|---|---|
| Where files are processed | In your browser, for compression and every other local tool. | In your browser. Their own words: images never leave your device. |
| Price | Free forever for the local tools. Pro $9/month unlocks the AI tools and the API beta. | Free. Open source. |
| Sign-up required | No account for any local tool. | No account. |
| Watermark | None. | None. |
| Batch | Yes — process a folder and download the set as a ZIP. | No. The web app handles one image at a time. |
| Encoder control | Quality and format, with sensible defaults and an automatic mode. | Extensive. Per-codec advanced options, a live side-by-side comparison, and a visual quality readout. |
| Other tools | 26, including conversion, resizing, cropping, redaction, OCR, PDF and AI editing. | Compression and resizing. That is the scope, deliberately. |
| API | Included with Pro, Business in beta: 1,000 operations/month, 20 MB maximum. | No hosted API. It is a web app, and the source is on GitHub if you want to run it yourself. |
| Offline | Installable as a PWA. | Yes, works offline. |
Where Squoosh is better
- The encoder controls are better than ours and better than almost anything else on the web. If you want to see what changing a specific MozJPEG or AVIF parameter does, with a live split-screen comparison at any zoom, Squoosh is the tool.
- It is open source. You can read exactly what it does, run it yourself, and satisfy a security review in a way that a closed product cannot match.
- It is free with no plan of any kind, and it is maintained by Google's Chrome team rather than by a company that needs it to make money.
- For a single image where you care about the last few kilobytes, its visual comparison view makes it easier to find the right quality setting than anything we offer.
Where OpusImg is better
- Batch. Squoosh handles one image at a time by design, and a folder of two hundred is where that stops being workable.
- Breadth. Compression is rarely the only step: the same file usually needs resizing, format conversion, cropping to a platform's ratio, or redaction before it ships.
- Presets for real destinations — social sizes, passport specifications, print dimensions — rather than raw encoder parameters.
We agree with them about architecture
This is an unusual comparison page because there is no disagreement about the important thing. Squoosh processes images locally because that is the right way to build an image compressor, and so do we. Their privacy claim and ours are the same claim, verifiable the same way: open the Network tab, run the tool, and watch nothing get uploaded.
That makes the comparison a narrow one about scope rather than a broad one about trust, which is a pleasant change.
Where the difference actually shows up
One image versus many. Squoosh is built around a single-image workflow with deep control, and it is very good at it. The moment the job is a folder, the model breaks down — not because the tool is bad, but because it was not built for that.
One step versus several. Preparing an image for a real destination is usually resize, then choose a format, then compress, and sometimes crop to a ratio or strip identifying metadata first. Doing that across two products means exporting an intermediate file, which is both slower and, if the intermediate is lossy, quality you did not need to lose.
An honest recommendation
If your question is "how small can I get this one image without it looking bad", open Squoosh. The side-by-side view will answer it faster than we will, and you will learn something about the codec while you are there.
If your question is "prepare these forty images for the site", that is the job we built for.
Which to use
Use Squoosh when
One image, maximum control, or you want to see and tune the encoder parameters directly — and you value that it is open source.
Use OpusImg when
A batch, or a job with more than one step, or you want presets for real destinations rather than codec parameters.
What we checked
Read on 7 September 2026. Squoosh is a product of its respective owners and is not affiliated with OpusImg.
Try it here
Terms used on this page: Lossy compression, Quantization, WebP, AVIF.
See every comparison, or the OpusImg pricing these numbers come from.