ToolBirch

File Checksum Calculator

SHA digests of a file to verify downloads.Security & Privacy

File Checksum Calculator

Compute SHA-1/256/384/512 digests of a file to verify downloads. Files are hashed locally with WebCrypto.

Up to 200 MB. Nothing is uploaded.

About this tool

Compute SHA-1/256/384/512 of any file locally with WebCrypto and compare against the digest a publisher publishes — the standard way to confirm a download arrived intact.

How to use the File Checksum Calculator tool

  1. Choose the file. Up to 200 MB; nothing is uploaded.
  2. Compute. All four digests are produced in one pass.
  3. Compare and copy. Each digest copies individually.

Supported formats

Input

  • Plain text or file input

Output

  • Converted or analysed output

Inputs are validated before anything is processed. Invalid values and unsupported files are rejected with a clear error instead of failing silently.

Frequently asked questions

Why four algorithms?

SHA-256 is the modern default; publishers still publish SHA-1 and SHA-512, so all are shown.

Is hashing a large file slow?

It is memory-bound; 200 MB is a sensible cap for a browser tab.

Is my file uploaded?

No. WebCrypto digests the bytes in place.

Privacy

Everything you enter stays in this browser tab. There is no upload endpoint for tool inputs, no account, and no server-side copy of your text or files. Results are produced locally and disappear when you close the page.

No account is required and no file is ever uploaded. See the privacy policy for details about analytics and the limited data this site stores.

Known limitations

  • MD5 and CRC32 are not offered — WebCrypto omits them and both are obsolete.

Related tools

Other free tools from the same collection.

Password Strength CheckerEstimate password strength from entropy and weak patterns.File Hash ComparatorCompare two files byte-for-byte via SHA-256.HMAC GeneratorKeyed message authentication with WebCrypto HMAC.JWT Signature VerifierCryptographically verify HMAC-signed JWTs.