JS Image Compressor
JS Image Compressor — compress an image in your browser by re-encoding it as JPEG. Nothing is uploaded and everything is processed locally on your device.
JS Image Compressor is a browser-based web developer tool on WebDevToolsBase. JS Image Compressor — compress an image in your browser by re-encoding it as JPEG. Nothing is uploaded and everything is processed locally on your device. To use it, choose an image, adjust Quality %, and download the generated JPEG — no signup and nothing to install.
JS Image Compressor is a free JavaScript Tools utility that runs entirely in your browser — nothing you enter is uploaded.
How to use JS Image Compressor
- Choose the image you want to re-encode as JPEG.
- Adjust Quality % and wait for the new JPEG and its size summary.
- Review the JPEG preview and byte size; re-encoding does not guarantee a smaller file.
- Use Download JPEG to save the actual image. Copy summary copies only the text summary, not image bytes.
About this tool
JS Image Compressor re-encodes a selected image as JPEG at the chosen quality. It shows a preview and byte-size summary; the output can be larger than the source.
The selected source is processed in your browser. Processing time and supported file sizes depend on the file and your device.
Frequently asked questions
What does JS Image Compressor do?
JS Image Compressor re-encodes a selected image as JPEG at the chosen quality. It shows a preview and byte-size summary; the output can be larger than the source.
Is JS Image Compressor free to use?
Yes — JS Image Compressor is completely free, with no usage limits.
Does JS Image Compressor upload my data?
No — JS Image Compressor processes everything locally in your browser, so nothing you enter is uploaded or stored.
Does JS Image Compressor work offline?
Once the page has loaded, JS Image Compressor keeps working with no network connection.