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Hash

Compute SHA-256, SHA-1, or SHA-512 hashes of files.

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About Hash

Hash computes a SHA-256, SHA-1, or SHA-512 checksum of any file and returns it as JSON. It is the fastest way to verify that a download matches its published checksum, or to prove two files are byte-for-byte identical. Hashing happens entirely in your browser, so even sensitive files never leave your machine.

Category
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Input
Accepts: */*.
Output
Outputs: application/json.
Cost
Free, runs in your browser
Memory
low
Privacy: Hash runs entirely on your device. Files you provide never leave your browser — no uploads, no server, no tracking. The page works offline once loaded.

Common uses

  • Verify an ISO or installer download against the SHA-256 checksum the vendor published
  • Confirm a file you received over email is identical to the one you sent, byte for byte
  • Generate a SHA-512 fingerprint of a backup archive to detect silent corruption later
  • Check whether two copies of a document with different names are actually the same file
  • Produce a SHA-1 hash for a legacy system that still expects that algorithm
  • Create a tamper-evidence record by saving a file's hash alongside it

Frequently asked questions

Which hash algorithms are supported?

SHA-256, SHA-1, and SHA-512. SHA-256 is the standard choice for download verification; SHA-512 gives a longer digest, and SHA-1 is offered for legacy compatibility only.

What kinds of files can I hash?

Any file at all — the tool accepts every file type. Hashing operates on raw bytes, so images, PDFs, archives, and binaries all work.

Is my file uploaded to compute the hash?

No. The checksum is calculated locally in your browser using the Web Crypto API. The file's bytes never leave your device.

Why is SHA-1 marked as legacy?

SHA-1 is considered cryptographically weak against collision attacks and should not be used for security guarantees. Use it only when an older system requires it; prefer SHA-256 or SHA-512 otherwise.

Will the same file always give the same hash?

Yes. A given file and algorithm always produce the identical digest, which is exactly what makes hashing useful for integrity checks.

Keywords

  • hash
  • checksum
  • sha256
  • sha1
  • sha512
  • integrity

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