01 / image-compressor
free online tool
Image Compressor
Reduce image file size instantly in your browser — no upload required.
Drop an image here or click to upload
how to use
- 01
Drop an image file onto the upload area or click to browse.
- 02
Adjust the quality slider (lower = smaller file, higher = better quality).
- 03
Click 'Compress Image' and download the result.
about
What is this tool?
Image Compressor is a free browser-based tool that reduces JPEG image file sizes by adjusting compression quality. Using the HTML5 Canvas API, it re-encodes your image at a lower quality setting without any server upload — keeping your files private and the process instant.
why use this tool
- -No upload required — your images never leave your browser.
- -Instant compression using native browser APIs.
- -Supports drag-and-drop for a smooth workflow.
- -Free with no file size limits imposed by server restrictions.
features
- -Adjustable quality slider from 10% to 100%.
- -Real-time file size comparison (original vs compressed).
- -One-click download of the compressed image.
- -Works with JPG, PNG, and other common image formats.
comparison
Quality vs File Size: What to Expect
| Quality Setting | Approx. File Size | Best Use Case |
|---|---|---|
| 90–100% | Large (near-original) | Print, portfolio, archiving |
| 70–80% | Medium (~40% smaller) | Web images, blog photos |
| 50–60% | Small (~65% smaller) | Thumbnails, email attachments |
| Below 50% | Very small | Previews, low-bandwidth delivery |
All processing happens entirely in your browser using JavaScript. No files, text, or data are ever sent to a server. Your data stays on your device.
✦ tip from dragontail
When I first built Dragontail's image toolset, I tested a 2.3 MB PNG and got it down to 420 KB at 75% quality — you genuinely cannot see the difference on screen. If you're running a blog or e-shop, running your hero images through this tool before uploading could meaningfully improve your Core Web Vitals LCP score.
faq
Does this tool upload my image to a server?
No. All compression is done in your browser using the Canvas API. Your image never leaves your device.
What formats are supported?
The tool accepts any image format your browser supports and outputs a JPEG. For lossless PNG output, use a dedicated PNG tool.
What quality setting should I use?
70–80% is usually a good balance between file size and visual quality. For web use, 60–75% is common.