The SHA-1 hash of any text or file
Hashed as UTF-8, exactly as typed, including spaces and line breaks.
Hashes
SHA-1 produces a 160-bit hash, written as 40 hex characters. It was the standard hash for years and still turns up in Git, older checksums, and legacy systems.
Not for security. In 2017 the SHAttered attack produced two different PDF files with the same SHA-1 hash, and browsers no longer accept SHA-1 certificates. Use SHA-256 for anything new; SHA-1 remains fine for non-security uses such as detecting accidental changes.
Git names every commit, file, and tree by the SHA-1 hash of its contents, which is where commit IDs such as a1b2c3d come from. Newer versions of Git can use SHA-256 instead.
Click Hash a file and choose the file, then paste the checksum published by the site you downloaded it from into Check against a hash. A match means your copy is identical to the original, byte for byte.
hello
// SHA-1
aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d