Bū tools
Verify a copy
Compare a folder and its copy, byte by byte, and find duplicates.
What it does
Checks that a copy is complete and intact: a card and the disk you offloaded it to, a disk and its backup. Everything is read on your device, nothing is sent.
- Choose (or drop) the original folder and the copy. Files are paired by their path inside the folder; the folders themselves can have different names.
- Content compares every pair byte by byte: the only way to be sure. Size only is fast but misses a damaged file of the right size.
- Duplicates: files with the same content in the original, whatever their names (SHA-256).
- The speed depends on your disks: a card reader or a USB drive is often the limit.
- On iPhone and iPad, Safari can’t choose a folder: choose the files instead; they are paired by name.
Free, no account, nothing is sent: it runs in your browser, even offline.
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