Image Compressor – Compress Image Online (Free Tool)

Image Compressor shrinks PNG, JPG, and WebP file sizes by re-encoding at a target quality. Useful for speeding up page loads, fitting into upload limits, or just saving bandwidth. Compression runs in the browser using canvas re-encoding — your image stays local and you can compare before/after side-by-side before downloading.

• Works offline after the first page load
• Lightweight page weight that loads quickly even on slow connections
• Works on desktop, tablet, and mobile in any modern browser
• Output preserves color profile and metadata except when stripping is explicitly requested
• Supports PNG, JPG, WebP, GIF, and SVG with consistent quality across formats

1. Upload one or more images to Image Compressor
2. Adjust the output dimensions, quality, or format
3. Click the action button — processing happens client-side using Canvas
4. Save each result individually or download all at once

• Optimising blog images for Core Web Vitals (Lighthouse loves smaller bytes)
• Reducing email attachment sizes below mail-server caps
• Preparing product photos for an e-commerce platform that imposes upload limits
• Compressing screenshots before pasting into a chat / issue tracker
• Saving storage on a personal cloud drive

Compressed image looks blocky / has artefacts.

Quality is too low. Raise the slider until artefacts disappear — 75-85 is a safe range for photographic content.

PNG size barely changed.

PNG is lossless. Convert to JPEG (for photos) or WebP (for both) to see real savings — quality 80-90 keeps it visually identical.

Output looks worse than the input even at quality 100.

Re-encoding always introduces some loss. If the original is already optimal, accept it — or try a lossless format like PNG → WebP-lossless.