Which image formats does Zqueezy support?

Zqueezy supports importing and encoding major modern web formats, including WebP, AVIF, MozJPEG, and PNG (powered by Squoosh and Oxipng WebAssembly codecs).

How do I install Zqueezy on Android or iPhone/iPad?

On Android, open Chrome or Edge, tap the browser menu (⋮), and select 'Install app' or 'Add to Home screen'. On iPhone or iPad, open Safari, tap the Share icon, scroll down, and tap 'Add to Home Screen'. Zqueezy installs as a standalone native app running in full-screen mode.

Which image format achieves the best compression ratio?

AVIF consistently achieves the highest compression efficiency, producing files 20% to 50% smaller than WebP and up to 80% to 90% smaller than legacy JPEG while preserving fine gradients and high dynamic range details.

Who develops and maintains Zqueezy?

Zqueezy is engineered and provided free and open-source by Zoviny Studios (https://zovinystudios.com).

Free Offline Batch Image Compressor & Optimizer

Q: Are my images uploaded to external servers when using Zqueezy?

No. Zqueezy processes 100% of your images locally on your device inside an isolated browser thread using WebAssembly. Your photos and personal data are never sent to external servers or cloud services, guaranteeing complete GDPR and CCPA compliance.

Q: How does Zqueezy compare to Google Squoosh?

Zqueezy is engineered as a modern, multi-featured successor to Google Squoosh. While preserving Squoosh-grade multi-threaded WebAssembly codecs (WebP, AVIF, MozJPEG, Oxipng), Zqueezy introduces full batch queue processing, 1-click ZIP export, bidirectional channel synchronization, a mobile touch scroll joystick, and native PWA installation across mobile and desktop devices.

Q: Can I compress multiple images simultaneously in batch?

Yes. Zqueezy features a full Bulk Mode where you can queue dozens of files, apply shared compression presets, inspect real-time byte savings, and export all optimized assets in a single ZIP archive.

Q: Does Zqueezy work offline without an internet connection?

Yes. Zqueezy is built as a Progressive Web App (PWA). Once loaded, all WebAssembly binaries and application scripts are cached locally, allowing full image optimization anywhere without an active internet connection.

Compress, resize, quantize, and inspect WebP, AVIF, MozJPEG, and PNG images locally on your device. Powered by WebAssembly with zero server uploads, 100% privacy, and instant ZIP batch export.

Supported WebAssembly Codecs & Algorithms

WebP Compression

Google libwebp WASM with lossy and lossless modes, near-lossless filtering, and configurable compression effort levels (1–6).

AVIF Compression

Next-generation AV1 image format. Achieves up to 90% size reduction over legacy JPEG while preserving fine gradients and dynamic range.

MozJPEG Encoding

Mozilla MozJPEG algorithm featuring progressive scans, trellis quantization, and psychovisual luminance optimizations.

Oxipng & Quantization

Lossless DEFLATE trial optimization with Oxipng, plus 2-to-256 color palette reduction with Floyd-Steinberg dithering.

Frequently Asked Questions (FAQ)

Are my images uploaded to external servers when using Zqueezy?

No. Zqueezy runs 100% locally in your browser using multi-threaded WebAssembly. Your photos and personal files never leave your device.

How does Zqueezy compare to Google Squoosh?

Zqueezy preserves Squoosh's proven WebAssembly codecs while adding full batch queue processing, 1-click ZIP export, bidirectional channel synchronization, a mobile touch scroll joystick, and offline PWA installation.

Can I compress multiple images simultaneously in batch?

Yes. Switch to Bulk Mode, queue dozens of images, apply shared compression presets, and download all optimized files in a single ZIP archive.

Does Zqueezy work offline without an internet connection?

Yes. Zqueezy is an offline Progressive Web App (PWA). All scripts and WebAssembly binaries are cached locally on your device for full functionality in Airplane Mode.