File Checksum Calculator
Calculate and verify file checksums (MD5, SHA-1, SHA-256, SHA-512).
Free online tool. No signup required. All processing runs in your browser.
Verify checksum
Paste the expected hash and select algorithm to compare with the file.
About this tool
Select a file to compute MD5, SHA-1, SHA-256, and/or SHA-512 hashes. Optionally paste an expected hash to verify. All processing runs in your browser.
What is File Checksum Calculator?
A checksum (hash) of a file is a short fingerprint. Comparing hashes verifies the file was not modified. MD5 and SHA-1 are legacy; SHA-256/SHA-512 are recommended.
How to use File Checksum Calculator
- Choose a file.
- Select which algorithms to run.
- Copy hashes or enter expected hash to verify.
Examples
Example input
(select a file)
Example output
SHA-256: a1b2c3...
FAQ
Is my file uploaded?
No. Hashing is done locally in the browser; the file never leaves your device.
Which hash should I use?
Prefer SHA-256 or SHA-512 for security. MD5 and SHA-1 are still used for non-security checksums.