Notes on moving files around
Occasional writing about file transfer, checksums, splitting and the things that go wrong with them — from the people who build the tools on this site.
Posts
How to open a .001 file
Why the usual advice about PK headers is wrong, and what actually distinguishes the two cases.
How to send a file that is too big for WhatsApp or email
Splitting, a transfer code, a cloud link, or a USB stick — and the FAT32 trap in the last one.
How to verify a download with SHA-256
A digest published beside the download proves less than people think. Here is what it is good for.
How to extract frames from a video without uploading it
Seeking lies, the first frame is often black, and codec support is a real limit rather than a bug.
Why uploading your files to an online tool is a risk
How to check for yourself, in about fifteen seconds, whether a page is sending your file anywhere.
Why there are only five
Because each one had to contain something we could only write after building the thing it describes — a measurement, a failure we hit, a piece of behaviour we checked rather than assumed. There is no shortage of topics; there is a shortage of posts that would be worse if someone else wrote them.
Move a file between two devices
A six-digit code on each end. No account, nothing to install, and the session deletes itself.
Start a session →