A batch-first Squoosh alternative
PixSip is a Squoosh alternative for people who need to compress multiple images, not repeat a one-file workflow. Both tools process images locally with open-source WebAssembly codecs; PixSip adds 20-image free batches, HEIC input, multi-format export and one ZIP download.
Comparison verified October 9, 2026 against the live Squoosh web app and official project documentation.
PixSip is an independent product and is not affiliated with, endorsed by or sponsored by Google or the Squoosh project.
Squoosh and PixSip solve different workflows
Squoosh remains the stronger choice when you want to tune one image with detailed encoder controls. PixSip keeps those codec families in the browser but optimizes the surrounding workflow for batches.
| Capability | Squoosh web app | PixSip |
|---|---|---|
| Image processing location | Local browser processing | Local browser processing |
| Images in one web batch | One; official FAQ says multiple images are “not yet” supported | 20 free; up to 500 on paid plans |
| Batch ZIP download | No batch to package | Yes, generated locally |
| HEIC input | No dedicated HEIC decoder | Yes, decoded locally |
| Several formats from every file | Two detailed comparison panes for one image | Up to 3 formats per file free; unrestricted on Ultra |
| Encoder controls | Detailed per-codec controls | One benchmarked quality preset |
| Hard 100 KB JPG target | Manual quality and resize tuning | Automatic quality search and resize fallback |
When Squoosh is still the better tool
Use Squoosh when you are optimizing one important asset and want to inspect or tune individual codec settings. Use PixSip when the repetitive work around the encoder—opening files, applying the same choice and collecting downloads—is the actual bottleneck.
20-image workflow benchmark
This benchmark counts the browser interactions required to compress and collect 20 images. It deliberately does not publish an elapsed-time winner: both tools run on the visitor’s CPU, and codec, quality, dimensions and hardware can change timing more than the interface does.
| Measured workflow step | Squoosh | PixSip Free |
|---|---|---|
| File-selection rounds | 20 | 1 |
| Images compressed | 20, one after another | 20, in one queue |
| Collection downloads | 20 individual downloads | 1 ZIP download |
| Shared settings across the set | Reapply per image | Choose once for the batch |
| Loose result files to organize | 20 | 0; one ZIP contains all results |
Method
- Test set: 20 ordinary web images that fit both tools’ supported browser inputs.
- Goal: apply one consistent compression choice and collect all 20 results.
- Counted: file-selection rounds and download actions; background codec work is not counted as a user action.
- Source check: Squoosh’s official FAQ states that its web app does not yet process multiple images at the same time.
This is a workflow comparison, not a claim that PixSip’s copy of a codec produces smaller bytes than the same codec configured in Squoosh.
Same codec families does not mean the same product
PixSip uses MozJPEG for JPG, libwebp for WebP, OxiPNG for PNG, libavif for AVIF and libjxl for JPEG XL. These open-source codec families are also used by Squoosh, which is why both tools can deliver serious compression without sending the image to a server.
PixSip adds its own worker pool, fixed quality calibration, palette refinement for photographic PNGs, target-size search, APNG preservation, HEIC decoding and batch export. “Also used by Squoosh” describes the open-source technology; it does not describe a partnership or endorsement.