Compress Image Online

1. Open your image

   Click the “Choose image” button, drag the file straight onto the page, or paste it with Ctrl+V. Want a test run first? Click “Try a sample photo”.

2. Pick the output format

   Use the format selector to stay on JPG, switch to WebP or keep PNG. For photos, JPG and WebP shrink the file far more; PNG makes sense for graphics with few colors.

3. Adjust the “Quality” slider

   Move the “Quality” slider between 10% and 100% and watch the Original/New comparison update live, with a badge showing the reduction as a percentage. Somewhere between 75% and 85% is almost always the sweet spot.

4. Download the compressed file

   Happy with the file size? Hit “Download” and get the smaller file instantly, with no watermark. The “Undo” button takes you back to the original image at any time.

Almost any time a photo has to travel. Email attachments have strict limits: many providers block messages over 25 MB, and four smartphone shots are enough to hit that ceiling. Online forms for job applications, grant submissions and school portals often reject files over 2 MB. On WhatsApp, an oversized image gets recompressed automatically with aggressive settings — compressing it yourself first, choosing the quality, almost always gives a better result. And if you run a website, every KB you save shortens page load times and improves the experience for mobile visitors. One tip: if the image is also huge in pixels, resize it first and compress afterwards — together, the two operations can cut the file size by 90%.

The “Quality” slider runs from 10% to 100%, but the relationship between quality and file size isn't linear: the first few percentage points you give up save an enormous amount, the last ones save almost nothing you'd notice. Here's a rough map for photos:

The Original/New comparison with its −% badge shows in real time how much you're saving: stop as soon as the preview starts to degrade.

The output format matters as much as the slider. JPG is the time-tested compromise: effective compression for photos and total compatibility with any program or device. WebP does even better: at the same visual quality it produces files roughly 25-30% smaller, making it the ideal choice for images headed for a website; if that's the only format you need, there's also a dedicated WebP conversion tool. PNG, being lossless, doesn't respond to the quality slider the way the other two do: it stays heavy for photos, but for logos, flat graphics and screenshots with text it's the best fit. To really understand the strengths and weaknesses of each, the guide to the differences between JPG, PNG and WebP compares them with concrete examples.

This tool uses your browser's Canvas API: the image is decoded, re-encoded in the chosen format at the quality you set, and handed back as a new file. Everything happens locally, on your computer or phone: the photo never leaves your device, and the export strips the EXIF metadata (camera model, GPS coordinates, date taken) — a detail that shaves off a few KB and keeps you from sharing information you never meant to. The engine handles images up to 4096 pixels on the long side, more than enough for web and social media. And because there's no upload, compression is instant even on a slow connection. For a complete strategy on file sizes and quality, see the guide on how to compress photos without losing quality.

• Start at 80% and only go lower if you must.
• For the web pick WebP: same look, fewer KB.
• Watch the −% badge: below 20% savings, try switching format.