Compress Image Online — Free, No Upload
Reduce image file size instantly in your browser. See exact savings before downloading. No account, no upload.
No Upload
Canvas API — your images never leave your browser.
Before/After Preview
See original vs compressed size and % saved instantly.
Batch Support
Compress dozens of images at once, download as ZIP.
When to compress images
- Website performance — large images slow down page load times and hurt Core Web Vitals scores
- Email attachments — most email providers have attachment limits (Gmail: 25MB)
- Social media uploads — platforms re-compress your images anyway; pre-compressing gives you control over the output
- Storage — a folder of compressed photos takes significantly less space
- Sharing apps — WhatsApp, Telegram, and similar apps often degrade image quality; starting with a well-compressed image gives better results
Frequently asked questions
How much can I reduce an image's file size online?
JPEGs at 75–80% quality are typically 30–70% smaller than the original, with minimal visible difference. PNG compression is more modest since PNG is already lossless — for maximum PNG compression, consider converting to WebP instead.
Will compressing an image reduce its dimensions?
No. The compressor reduces file size through quality/compression adjustment without changing the pixel dimensions. The output image has the same width and height as the input.
Are my images uploaded when I compress them online?
No. This tool uses the browser's Canvas API to compress images locally. Your files are never sent to any server — the compression happens entirely on your device.
Which quality setting should I use?
For most uses: 'Balanced' (75%) gives a good file size reduction with barely noticeable quality loss. For photos where quality is critical, use 'High Quality' (90%). For the smallest possible size (thumbnails, previews), use 'Maximum' (50–60%).
Can I compress multiple images at once?
Yes. Upload multiple JPG or PNG images and they are all compressed with the same quality setting. Download individually or as a ZIP archive.