Know what the limit is about
Forms usually limit file size in kilobytes (KB) or megabytes (MB), and sometimes the pixel dimensions as well. The two are different: a large image can have a small file size if it is compressed well, and a small image can have a large file size if it is not. This tool targets the file size and only reduces the dimensions when the quality alone cannot reach the limit.
The image presets (100 KB, 200 KB, 500 KB and 1 MB) cover the most common caps, and Custom lets you type any number in KB.
Step by step
- Open the image compressor and drop your photo. It is processed on your device.
- Pick the size from the form. If the form says 200 KB, pick 200 KB.
- Choose JPEG for maximum compatibility, or WebP if the site accepts it and you want a smaller file.
- Press Compress and download the result. Check that it still looks right before uploading.
JPEG, WebP or PNG?
- JPEG is the safest choice for photos and works everywhere.
- WebP gives smaller files at similar quality, but a few older systems do not accept it.
- PNG is lossless, so its size cannot be tuned. The tool converts it to JPEG or WebP. Transparent areas become white in JPEG; use WebP to keep transparency.
Quality or resolution?
The tool first searches for the highest quality that fits. Only when even a low quality is still too big does it shrink the picture, step by step. That keeps as much detail as possible. If you already know the form needs a specific size in pixels, resize the image to that size first and then compress it.
Tips
- Crop away empty areas first. Less picture means less data.
- Avoid screenshots of screenshots. Each copy loses detail.
- Keep your original. Always upload the compressed copy and keep the full-quality file.
- iPhone HEIC photos work too: the compressor opens them in your browser and saves a JPEG or WebP that any form accepts.