Online tools that never upload your files

Three checks that actually work. First, read the description: a genuinely local tool says so plainly ('runs locally', 'file never leaves your device', 'no upload'). Second, load the page, disconnect from the internet, and use it — if it still works, the processing is local. Third, open your browser's Network panel and watch while you process a file: a local tool produces no large outbound request.

Image processing (background removal, watermark removal, resizing, compression), PDF handling (compare, merge, convert), audio and video conversion, and a large set of small utilities. Modern browsers can do far more locally than most people assume.

For files up to a few hundred megabytes it's usually indistinguishable and often faster, since there's no upload and no queue. The constraint is your device's memory, not the network. Very large jobs are still better served by a desktop application.

That's exactly the use case this page is built for. Prefer tools that state they process locally and collect no data, and verify with the Network-panel check above. No upload means no third party can retain a copy.

Once the page has loaded, many do — which is also the simplest way to verify the claim. Those that need a first network request for the app itself will still usually keep your file local afterwards.