How to use it
- Choose your photo or drop it into the box.
- Keep the target at 400 KB, or change it to any size you need.
- Check the preview, then download the new file.
Why 400KB?
400KB is a common limit for product photos, blog images and visa uploads. 400KB keeps nearly all visible detail while cutting a typical phone photo by 90 percent or more.
How it works: the tool tries the best JPEG quality that fits under your limit. If quality alone is not enough, it reduces the image dimensions a little at a time until the file fits. Everything happens inside your browser tab, so there is no upload, no account and no watermark.
Tip: if the result looks too soft, crop away empty space first (a smaller picture needs less compression) or raise the target a little.
Questions
How do I compress an image to 400KB?
Choose your photo, keep the target at 400KB and download the result. The tool finds the highest JPEG quality that fits under 400KB and only shrinks the dimensions if it has to.
Is my photo uploaded to a server?
No. Compression runs entirely in your browser, so your image never leaves your device.
Will the quality drop at 400KB?
Some loss is unavoidable when a file gets smaller, but the tool keeps the best quality that still fits the limit. Photos with fine detail lose more than simple images; raise the target if the result looks too soft.
Which formats work?
JPG, PNG and WebP can be used as input. The output is always a JPG, the format that gives the smallest file for photos. Transparent areas of a PNG become white.