About krzen
krzen.com is a free image compression tool that runs entirely in your browser using the Canvas API. No images are uploaded to any server. Everything is processed locally on your device.
Features
- Drag and drop or file picker for JPEG, PNG, and WebP
- Quality slider (1-100) for precise compression control
- Output format selection: JPEG, WebP, PNG
- Resize with aspect ratio preservation
- Before/after slider comparison
- Compression stats: original size, compressed size, savings
- Bulk mode: drop multiple images, compress individually
How It Works
The tool uses the HTML5 Canvas API to read your image, optionally resize it, then re-encode it using canvas.toBlob() with your chosen format and quality settings. This is the same compression pipeline used by modern browsers for native image rendering.
Part of the zovo.one Network
krzen.com is built by zovo.one. More tools: