Image Compressor

Compress JPEG, WEBP, and AVIF images to reduce file size while maintaining quality. 100% client-side with zero data upload.

Smaller file ← → Better quality
Drop images here or click to browseSupports: JPEG, WEBP, AVIF, PNG (multiple files)
🛡️Zero server logs. All compression runs 100% inside your browser. Your files never leave this tab.
🛠️Developer Tool Belt
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Image Compressor

Image Compressor is a 100% browser-based tool for reducing image file sizes. All processing happens locally via Web Workers — your images never leave your device.

🔒 Client-side only⚡ Web Worker processing🌐 Works offline🛡️ Zero server logs

How to Compress Images Online

  1. Drag and drop an image or click to select from your device.
  2. Adjust the quality slider to find the perfect balance between size and quality.
  3. Click Compress and download your optimized image.

Frequently Asked Questions

Got questions about image compression? We've got answers.

What image formats can be compressed?

Image Compressor supports JPEG, WEBP, and AVIF compression. PNG images will be displayed but compression is most effective on lossy formats.

Will compression reduce image quality?

Compression reduces file size by removing some image data. The quality slider lets you control this trade-off — higher quality means larger files, lower quality means smaller files.

Is Image Compressor safe to use?

Yes, absolutely. All processing happens entirely in your browser via Web Workers. Your images are never uploaded to any server.

Automated E2E Test Suite Logs

Our build systems validate edge-case processing under extreme conditions before each deployment.

Stability
100.0%
Passed
10/10
Env
V8-Sandbox
Engine: Vitest RunnerUpdated: 2026/6/13 02:40:10
PASSCompress Operation should support JPEG, WEBP, and AVIF
PASSCompress Operation should be async function
PASSCompress Operation should throw on invalid image
PASSImageCompressorTool should render dropzone when empty
PASSImageCompressorTool should render Compress button
PASSImageCompressorTool should render quality slider
PASSImageCompressorTool should render privacy strip
PASSImageCompressorTool renders dropzone with multiple accept attribute
PASSImage Compressor Worker should handle compress action
PASSImage Compressor Worker should return error for unknown action
⏱️ 0.18ms📦 1.5KB🎚️ Max Nesting: 3🌿 AST Nodes: 48🛡️ V8 Heap: Healthy
$ codecaven-validator --scope=tool● CLUSTER COMPLIANT

Tool Changelog & Updates

v1.1.02026-06-12
  • Feature: Batch image compression — upload multiple images at once, process in parallel via Web Workers, and download all results.
  • Fix: Fixed double-encoding bug where the browser re-encoded at default quality after compression, negating the user-set quality — now uses a single encode pass for accurate file size reduction.
  • UX: Redesigned UI with thumbnail cards showing original size, compressed size, and savings percentage per image.
v1.0.02026-06-11
  • Feature: Initial release with JPEG, WEBP, and AVIF lossy compression — 100% client-side via Web Worker.
  • UX: Quality slider with real-time file size comparison and compression ratio display.
  • UX: Format detection with warning for non-optimizable image types.
  • Security: Web Worker isolation ensures zero data uploads — all processing stays in the browser.