Frequently asked questions

No. Every step — opening the file, cropping, resizing, making it smaller and bundling several together — happens right inside the web page on your own device. Your files never leave your computer or phone, and nothing is kept once you close the tab.

Images in PNG, JPEG and WebP, and PDF documents. You can also switch an image from one type to another while you compress it — for example turning a large PNG screenshot into a much smaller WebP.

For scanned or picture-heavy PDFs, Byteshrink takes a fresh, lower-resolution snapshot of each page and saves those as a new PDF. If you would rather keep the text selectable, there is a lighter option that just removes hidden information and tidies the file up.

For JPEG and WebP, a lower quality setting trades some fine detail for a smaller file. The preview step shows the original and the smaller version side by side, so you can pick a setting you are happy with before downloading. PNG stays perfectly sharp unless you turn on the colour-saving option.

There is no set limit. The real limit is how much memory your device has, since all the work is done locally. Byteshrink warns you when a file is big enough that it might be slow.

Yes. You can drag the corners, pinch to zoom, move the picture around, and rotate or flip it, with aspect-ratio presets and a helpful grid. It is built for touch first.

Yes. Because all the work happens on your own device, there are no server costs to pass on. There is no account, no sign-up and no watermark on your files.

Yes. Add several files in the first step and Byteshrink handles them all with the same settings, then lets you download each one on its own or all of them in a single ZIP file.