Image Compressor
Lossy / lossless compression. Reduce file size while preserving quality. Use our free online calculator for fast, accurate results with no registration required. Simple, private, and ready to use in seconds.
How to use Image Compressor
- 1Click "Upload image" and choose JPG / PNG / WEBP (batch supported).
- 2Drag the quality slider or pick "lossy / lossless", watch the size preview update live.
- 3Compare original vs compressed, then click "Download".
How image compression works and which mode to pick
lossy: output ≈ source × quality factor; lossless: drops only redundant data, pixels unchangedLossy compression drops high-frequency detail the eye barely notices to shrink size a lot — great for photos. Lossless removes file redundancy without altering any pixel, ideal when every detail must survive.
Compression runs locally with no upload, so you can quickly slim images for the web, email attachments, or storage, and compare before/after visually.
Frequently asked questions
Lossy or lossless?
Use lossy for photos and banners where looks matter; lossless for screenshots, line art, or assets you will edit again.
Can I recover after compression?
Lossy is irreversible — keep the original. Lossless can be re-exported with no detail change.
Is my image leaked?
No. All compression is local in your browser; nothing is uploaded.