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Free online tool

Hash Calculator

Calculate common text or local-file digests in the browser and compare exact hexadecimal output for integrity checks.

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What Hash Calculator does

Calculate common text or local-file digests in the browser and compare exact hexadecimal output for integrity checks.

Worked example

Input

Text: hello using SHA-256

Result

2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824 (64 hexadecimal characters total)

How the result is produced

A cryptographic hash maps arbitrary input bytes to a fixed-length digest. A one-byte change should produce a different digest, but the digest cannot restore the original input.

Useful workflows

  • Compare a downloaded file with a publisher checksum
  • Generate repeatable test digests
  • Confirm whether two text values have identical bytes

Important limits

  • MD5 and SHA-1 are unsuitable for modern collision-resistant security.
  • A plain fast hash is not password storage; password systems require a salted, slow password-hashing function.
  • Different line endings or text encodings produce different digests.

Frequently asked questions

Can a hash be decrypted?

No. Hashing is one-way; weak inputs can still be guessed by hashing candidate values.

Why does my checksum differ?

Check the algorithm, exact file version, text encoding, capitalization and line endings.

Can a hash prove who created a file?

No. A matching digest checks byte equality, but authorship and trusted timestamps require signatures or another authenticated record.

Text is encoded as UTF-8 without trimming or Unicode normalization; the textarea uses LF line breaks. Files hash their original bytes, including any BOM or CRLF. Empty input is valid. Limits: one file up to 64 MiB (67108864 bytes), or 500000 UTF-16 code units of text; files are read whole into memory. Algorithms: MD5, SHA-1, SHA-256, SHA-384 and SHA-512, giving 32, 40, 64, 96 and 128 hexadecimal characters. Letter case changes only presentation. The result has algorithm, source, byte count and digest; copy it, since there is no download button. A matching digest is evidence, not mathematical proof of byte identity or authorship: collisions exist. Compare against an authenticated publisher checksum.

Processing takes place locally in your browser.