How much can image compression reduce file size?

Typical reductions are 40–70% for JPEG images and 20–40% for PNG images, depending on the content. Photographs with many colours compress more than graphics with flat areas.

Will my images look worse after compression?

At default settings, the quality loss is minimal and not noticeable to most viewers. You can adjust the quality slider to prioritise size or quality according to your needs.

Is my data uploaded to a server?

No. Compression runs entirely in your browser. Your images are never uploaded, stored, or processed on any server.

Best Free Online Image Compressor

Large image files slow down websites, drain mobile data, and take up unnecessary storage. devtoolkit.sh's Image Compressor reduces file sizes significantly while keeping images looking sharp to the human eye. It supports JPEG, PNG, and WebP formats, and you can compress multiple images at once. Smart compression algorithms automatically select the best approach for each image type — lossy for photographs, lossless for graphics with flat colours. Everything happens in your browser, so your photos and sensitive images never leave your device. The tool shows the original and compressed file sizes side by side, so you always know exactly how much you are saving.

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FAQ

How much can image compression reduce file size?: Typical reductions are 40–70% for JPEG images and 20–40% for PNG images, depending on the content. Photographs with many colours compress more than graphics with flat areas.
Will my images look worse after compression?: At default settings, the quality loss is minimal and not noticeable to most viewers. You can adjust the quality slider to prioritise size or quality according to your needs.
Is my data uploaded to a server?: No. Compression runs entirely in your browser. Your images are never uploaded, stored, or processed on any server.