The work happens
on your side of the wire.
Every tool here works the way the rest of hushhh works: the file is opened by this tab, on your machine, and the result is handed straight back to you. There is no upload step, no queue, and nothing on our disks to delete afterwards.
Works without a connection
A conventional online converter takes your file, puts it on someone else's disk, does the work there and lets you download the result. Two copies of your file then exist somewhere you cannot see, for as long as that company decides. Here the code that does the work is shipped to your browser instead of your file being shipped to a server: the bytes are read by this tab, transformed in memory, and written back out as a download. Our server never sees them, so there is nothing for us to keep, log or lose.
One thing is counted, and here it is: when a tool finishes, this page tells the server which tool ran and whether it worked — never the file, its name, its size or anything read out of it, none of which ever leaves this tab. It is how we know which tools are worth keeping. The record is the same kind we keep for a one-time link: a truncated IP address, a country and a region.
Once the page has loaded, these tools keep working with the network switched off. That is the simplest proof that nothing is being sent anywhere.
The same idea, applied to sending things rather than changing them.