Image compressor help

The Image Compressor re-encodes one selected image locally in your browser, keeps the original dimensions, previews the result, and shows output file size before download.

Supported Files

Use common browser-readable still images such as PNG, JPG, JPEG, WebP, and BMP. Animated images, very large files, unusual color profiles, or files your browser cannot decode may fail or export only a still frame.

Local Processing And Privacy

PixTools does not require an account and does not upload your selected image to a PixTools server for compression. The preview and download are created by your browser's image and Canvas APIs.

Compression Versus Quality

The slider is labeled Compression because higher values request more of the available browser-side size reduction for the selected file. 0% keeps the current file state, 100% uses the browser's most aggressive export, and values between them aim for that part of the available reduction while keeping as much quality as the browser can.

PNG And BMP Limits

Browser PNG export is lossless, so a quality-style slider does not reduce PNG output the same way it does for JPEG or WebP. This compressor exports PNG and BMP originals as JPEG so the compression setting can affect file size. Transparent pixels are flattened onto white.

Downloads

The download button uses the current rendered preview. Filenames add a compressed suffix and use the output extension, such as JPG or WebP.

Troubleshooting

If preview or download fails, try a smaller image, reduce compression, refresh the page, or use a current version of Chrome, Edge, Firefox, or Safari. If the result is larger than expected, increase compression or resize the image first.

Related Tools

Use Image Resizer when dimensions also need to change, Image Converter when the file type is wrong, or Image Upscaler when a small source needs a larger copy.

FAQ

Does compression resize my image?

No. The compressor keeps the original pixel dimensions. Use Image Resizer when width or height changes.

How does the compression slider work?

The slider is scaled to the selected file. 0% keeps the current file state, 100% uses the browser's most aggressive export, and values between them aim for that part of the available size reduction.

Why did my PNG become JPEG?

PNG and BMP originals export as JPEG in this tool so the compression slider can affect file size. Transparent pixels are flattened onto white.