What This Tool Does
This tool computes checksums of a file using several common algorithms. You see the MD5, SHA-1, SHA-256 and SHA-512 hashes of the uploaded file in one report, and you can compare them with the value given by the sender to prove the file arrived intact.
Checksums are the standard way to verify downloads: if the hash matches the publisher's value, the bytes are the same.
What the Report Shows
- MD5, SHA-1, SHA-256 and SHA-512 hashes.
- Each hash with a copy-ready format.
- Optional: a match result when you paste the expected hash to compare.
Step by Step
- 1
Drop or upload the file.
- 2
Optionally paste the expected checksum into the comparison box.
- 3
Click Compute Checksum.
- 4
Compare the hashes with the publisher's values.
Which Algorithm Should I Use?
- Prefer SHA-256 or SHA-512 from a trusted source.
- MD5 and SHA-1 are shown for compatibility with older mirrors, not for security-sensitive checks.
- Match your comparison to the algorithm the provider published.
Troubleshooting
- Expected values are compared case-insensitively and with or without spaces.
- A mismatch means the bytes differ; re-download before trusting the file.
- Very large files are hashed in the streaming envelope without loading into memory.
Frequently Asked Questions
What is a checksum?
A short fingerprint computed from a file. The same file always produces the same hash, so matches prove identical content.
Which hash should I trust?
Use SHA-256 or SHA-512 when the source publishes one. MD5 and SHA-1 are for legacy comparisons.
Can I compare to a downloaded value?
Yes, paste the expected hash and the report will flag match or mismatch.
Is the file stored?
Only temporarily for hashing, then removed.
Do I need any software?
No, everything runs in the browser session.