Checksum Calculator

Summary

Type or paste text (or drop a file) to instantly compute MD5, SHA-1, SHA-256, SHA-512, and CRC-32 checksums entirely in your browser.

How it works

1. Type or paste text in the input area, or switch to File mode and drop/select a file.
2. The tool reads the content as a UTF-8 encoded byte array (text) or ArrayBuffer (file).
3. SHA-1, SHA-256, and SHA-512 are computed via the browser WebCrypto API.
4. MD5 is computed with a pure-JS implementation running entirely client-side.
5. CRC-32 is computed with a standard polynomial table lookup in JavaScript.
6. All five digests are displayed simultaneously with one-click copy buttons.

Use cases

• Verify a config file or script has not been unexpectedly modified.
• Generate a quick MD5 or SHA-256 fingerprint for a build artifact.
• Cross-check a downloaded file against a published checksum.
• Compute a CRC-32 for embedded systems or network protocol validation.
• Hash a password or token string for debugging purposes.
• Compare checksums of two strings to confirm they differ or match.
• Generate multiple algorithm digests at once for documentation.
• Audit file integrity before committing code to a repository.

Frequently Asked Questions