Why compress images?
Large images are the number-one cause of slow pages, blown email attachment limits, and wasted storage. A single phone photo can be several megabytes — far more than a web page or message needs. Compressing trims that down by re-encoding the image at a lower quality setting, throwing away detail your eye barely registers. The result loads faster, uploads anywhere, and looks practically identical.
How to compress an image
- Drop your files — drag JPG or WEBP images onto the upload zone, click to browse, or paste from clipboard. Up to 30 at once.
- Set the quality — 80% is a safe default. Lower it for smaller files, raise it to protect detail.
- Click Compress — decoding and re-encoding happen locally with the Canvas API. Your files stay on your device.
- Check the savings and download — each file shows its before/after size and percent saved. Download one by one or all at once as a ZIP.
Compressing vs. resizing
These solve different problems. Compressing keeps the same dimensions (pixel width and height) but lowers the encoding quality to cut file size. Resizing changes the actual pixel dimensions — a 4000×3000 photo down to 1280×960, for example. For the smallest possible file, do both: resize to the dimensions you actually need, then compress. An image resizer is coming soon; for now this tool handles the compression half.
Choosing a quality setting
| Quality | Best for | Trade-off |
|---|---|---|
| 90–100% | Archival, print, images with text or logos | Largest files, minimal savings |
| 75–85% | Most web photos — the sweet spot | Big size drop, loss hard to spot |
| 50–70% | Thumbnails, previews, tight size limits | Visible artifacts on detail and edges |
What about PNG?
PNG is a lossless format, so there is no quality dial to turn — re-encoding a PNG does not make it smaller. The most effective way to shrink a PNG is to convert it to WEBP, which preserves transparency and is typically much smaller. Use our PNG to WEBP tool for that. If you do not need transparency, PNG to JPG shrinks photographic PNGs even further.
Privacy
Every byte stays in your browser. No upload, no temporary server file, no log. The compression runs in a <canvas> element using the browser's built-in JPG and WEBP encoders.