To test something before you trust it with a real document: a converter, an upload form, a size limit, a slow connection. A known file makes the result easy to judge. If the output looks wrong, you know it was the tool and not your file — and you have not handed over anything private.

Every file here is made by this site, with real content — tables, photos, video with sound. Sizes up to 1 MB download straight from the site. Anything bigger — 5 MB, 100 MB, 1 GB, or any size you type — is made on your own device in a moment and saved straight to your disk, so nothing large is stored on a server. Text, documents and archives are written in full at every size; photos and video are the 1 MB file made bigger with space the format allows, so they open normally.

And the tools on this site run in your browser too: try a sample with them and nothing is uploaded — true for the sample, and for the real file you were worried about.