Evidence hash checker and chain of custody form

Pick a file. Its SHA-256 and SHA-1 are worked out here in your browser: the file is never uploaded and never leaves your computer. Then check it against a known value and print a chain of custody form.

1. The file

Drop a file here, or tap to choose one

SHA-256

SHA-1

2. Check it against a known hash (optional)

Paste the hash you were given

3. Chain of custody form

Case or matter number Item number Collected by Date and time collected Where it was collected Device or source (make, model, serial)

Description of the item

Doing this for a whole case?

Cyfirx hashes evidence as it comes in, keeps the chain of custody for every item, and builds the report. The free tier covers three active cases.

Get Cyfirx free

The hashes are calculated by your own browser with its built-in cryptography. Very large files (over about 1 GB) may not fit in a browser's memory; use a desktop tool for disk images. This form is a general template, not legal advice: follow your own agency's or court's requirements. © Cyfirx.