A free Squoosh alternative that runs in your browser

Try it now: Image Compressor

Compress images instantly and reduce file size efficiently.

This is the real tool, not a demo. Open Image Compressor on its own page.

AltFTool vs Squoosh

Squoosh is not a service we are undercutting; it has the same privacy posture we do, and its encoder controls are better than ours. MozJPEG, OxiPNG, AVIF and JPEG XL with quality, effort and dithering exposed, plus a comparison slider that shows you exactly what you are trading — that is a better tool for tuning one image than anything here. Where AltFTool helps is the surrounding work: Squoosh is one image at a time and covers compression, conversion, resize and rotate only, so anything before or after that step happens elsewhere.

Squoosh's free tier, in their own words

• Completely free with no account, no ads and no advertised usage cap anywhere on squoosh.app
• Single-image workflow: the file picker is not multi-select (input has multiple=false), so there is no batch or bulk queue in the web app
• Scope is compression, format conversion, resize and rotate only — no PDF, no background removal, no wider tool suite
• Files stay local: "Images never leave your device since Squoosh does all the work locally" (squoosh.app) and "Squoosh does not send your image to a server. All image compression processes locally." (project README)
• The project README discloses that Squoosh uses Google Analytics to collect basic visitor data plus the before and after image size values

Checked on 2026-07-25 against the following sources, each opening in a new tab: squoosh.app/, github.com/GoogleChromeLabs/squoosh, raw.githubusercontent.com/GoogleChromeLabs/squoosh/dev/README.md, api.github.com/repos/GoogleChromeLabs/squoosh/contents/codecs. Vendors change their plans — if something here is out of date, trust Squoosh's own page over ours.

What Squoosh does better

Plenty of people should keep paying for Squoosh, and these are the reasons why.

• It is fully client-side and free, exactly like AltFTool — the same privacy posture, not a weaker one. Anyone recommending local-only image compression is on solid ground recommending Squoosh.
• Best-in-class encoder control: MozJPEG, OxiPNG, WebP, WebP v2, AVIF, JPEG XL and QOI codecs compiled to WebAssembly, with granular quality, effort, quantization and dithering settings that most one-click compressors hide entirely.
• The live side-by-side comparison slider with an instant file-size readout is the clearest way to actually judge a quality/size tradeoff, and the app is open source (Apache-2.0), installable as an offline PWA, and auditable or self-hostable.

And what AltFTool does not do

• Squoosh exposes codec internals we do not: MozJPEG, OxiPNG, WebP v2, AVIF and JPEG XL with quality, effort, quantization and dithering settings.
• No side-by-side comparison slider with a live size readout — the clearest way to judge a quality tradeoff, and Squoosh's best feature.
• Squoosh is open source and self-hostable; our tools are not, so you cannot audit or run them yourself.

Visit Squoosh (opens in a new tab)

Where each Squoosh job goes here

Left: what you clicked on Squoosh. Right: the tool that does the same job here.

• Compress an imageImage Compressor
• Resize on exportImage Resizer
• Change format (WebP → PNG/JPG)WebP to PNG / JPG Converter
• Convert HEIC from an iPhoneHEIC to JPG Converter
• Compare two versionsImage Resolution Compare
• Crop before encodingImage Cropper

The tools that cover Squoosh work

• Image CompressorCompress images instantly and reduce file size efficiently.Open
• Image ResizerResize images with custom dimensions, social media presets, fit/crop modes, batch processing, and format export.Open
• WebP to PNG / JPG ConverterConvert WebP images to high-quality PNG, JPG, or PDF files quickly in your browser. Batch convert multiple files and download as a ZIP archive.Open
• HEIC to JPG ConverterConvert Apple HEIC/HEIF images into standard JPG or PNG files locally in your web browser. Supports batch conversions, custom image quality, and ZIP exports.Open
• Image Quality CheckerAnalyze image quality with nine professional metrics including sharpness, brightness, contrast, noise, exposure, and histogram analysis.Open
• Image Resolution CompareCompare image resolution, quality, sharpness, DPI, and compression like a professional. Analyze two images side-by-side with detailed metrics.Open
• Image CropperCrop your image according to your needsOpen
• SVG to ImageRasterise SVG markup to a downloadable PNG, JPEG or WebP at any scale, entirely in your browser.Open

Questions people actually ask

Is Squoosh better than AltFTool for compression?

For tuning a single image carefully, yes. Its codec controls and comparison slider are more precise than ours, and it is open source. We are the better fit when compression is one step in a longer job.

Do both really keep images on my device?

Yes. Squoosh states it plainly, and our image tools work the same way. This is a rare case where two tools make the same privacy claim and both are accurate.

Can either of them batch-process a folder?

Squoosh's web app cannot — its file picker takes one image. Ours accepts multiple files on some tools, but a browser tab is still the ceiling; a build-time CLI is better for a whole folder.