Image Compressor
Shrink JPG, PNG and WebP files in your browser — quality you control, zero uploads.
Free · No sign-up · Runs locally in your browser · Also available in Chinese (中文)
What is Image Compressor?
An image compressor reduces file size by removing data the eye barely misses: redundant pixels, higher-entropy color detail and unused metadata. Smart compression typically cuts a photo by 60–90% with no visible difference, which directly speeds up page loads and saves storage and bandwidth.
This tool compresses entirely on your device using the browser's own encoding engine — your photos never leave it. That makes it safe for private, client or confidential imagery, and it works offline once loaded. You set the quality level and the maximum dimensions; the tool handles the rest and shows the before/after size.
How to use it
- 1Drop your images onto the page or click to pick files — batch processing works.
- 2Set the quality slider (75–85 is usually indistinguishable from the original).
- 3Optionally cap the width/height for web usage.
- 4Compare the size savings per file, then download the compressed results.
Common use cases
- Optimizing blog and e-commerce images so pages pass Core Web Vitals.
- Shrinking phone photos before emailing or uploading them to a form with size limits.
- Reducing a folder of screenshots before zipping and sharing it.
Frequently asked questions
▸Will compression visibly reduce quality?
At quality 75–85 the difference is essentially invisible for photos. Below ~50 you may see blocking on fine detail and text — always check the preview before saving.
▸Are my images uploaded to a server?
No. Compression runs in your browser with Canvas/WebCodecs. Your files stay on your device, and the tool keeps working offline.