Free Image Compressor

How to compress an image

1. Click Choose images or drag your files onto the box.
2. Adjust the quality slider — lower means smaller files.
3. Download each compressed image. Done.

Why compress images?

Large images are the single most common cause of slow-loading web pages. A page that takes more than a few seconds to load loses visitors and ranks worse in search. Compressing your images keeps them looking sharp while cutting the file size by anywhere from 50% to 90%. Beyond websites, smaller images are easier to email (many providers cap attachments at 25 MB), faster to upload, and gentler on your device's storage. Because this tool works entirely offline in your browser, it's faster and far more private than upload-based services.

How image compression works

Photos contain far more detail than your eye can perceive, especially in smooth areas like skies, walls, and skin. Lossy compression, used by JPEG and WebP, cleverly discards the information you're least likely to notice while preserving the edges and shapes that define the image. That's why a photo can shrink dramatically with no visible change. This tool re-encodes your image at the quality level you choose, giving you direct control over the trade-off between size and fidelity.

Choosing the right quality level

• 90–100%: near-original quality, modest size savings — good for archival or print.
• 75–85%: the sweet spot for the web. Most people can't tell the difference from the original, and files shrink substantially.
• 50–70%: noticeably smaller, with slight softening — fine for thumbnails and previews.
• Below 50%: visible artifacts around edges and text; use only when size matters more than looks.

JPEG vs. WebP output

This tool outputs JPEG for photos and WebP where it helps most. WebP, developed by Google, typically produces files 25–35% smaller than JPEG at the same visual quality, and every modern browser supports it. If you need maximum compatibility with older software, keep a JPEG copy as well. For a deeper comparison, see our guide on choosing between JPG, PNG, and WebP.

Tips for the smallest possible file

• Resize before you compress. If an image will display at 1200px wide, there's no reason to keep it at 4000px. Use our Image Resizer first, then compress.
• Don't re-compress repeatedly. Each pass through a lossy encoder throws away more detail. Always start from the best original you have.
• Batch your work. You can drop many images at once and download them individually.

Is it safe and private?

Yes. Unlike most "online image compressor" websites, this tool never uploads your photos. Everything happens locally using your browser's built-in Canvas API, so your images never touch a server. That makes it safe for sensitive or personal pictures and means it keeps working even if you lose your internet connection after the page loads.