Compare checksums
Compare a local file hash with the SHA-256 value published in release notes or download pages.
File Hash Calculator
🔒 Browser-side processing
Calculate SHA hashes for uploaded files locally in the browser.
Guide
File hash verification workflow
Calculate SHA hashes for downloads, release artifacts, and shared files in the browser to verify integrity.
No upload required
The browser reads the file and computes the hash locally; the selected file is not uploaded by this tool.
Record multiple hashes
When needed, keep SHA-256 and SHA-512 values together in verification notes.
More: how to use it, examples, and common errors
Workflow
How to use it
- Select the file you want to verify.
- Compare the calculated SHA value with the reference value from a release note, download page, or internal document.
- Ignore casing and extra whitespace when comparing hexadecimal strings.
- If the value differs, download the file again or review the transfer path.
Examples
Real input and output
Verifying a download
Input
ubuntu-24.04.isoOutput
SHA-256
9b2e1f...c47a3dIf a single character differs from the published checksum, the file is corrupted or tampered with.
Troubleshooting
Errors you will hit
Case differences look like a mismatch
Hex digests are case insensitive. 9B2E and 9b2e are the same value — normalize the case before comparing.
The browser stalls on large files
Hashing happens in memory, so multi-gigabyte files can overwhelm the tab. Use an OS command such as shasum or certutil for those.
Can you trust a SHA-1 result?
SHA-1 has demonstrated collision attacks and is unsuitable for security verification. Use SHA-256 or stronger.
Review
Things to check
Hashing is not encryption
A hash identifies file content and helps with integrity checks. It does not restore the original file or provide secrecy.
Large files take time
Very large files can use more browser memory and processing time. Wait briefly before assuming the calculation failed.
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