1. Add your files
Choose or drag in one or two files. They are read by your browser and never uploaded.
File Hash Compare
Check whether two files are identical, or verify a download against a published checksum, using SHA-256, SHA-384, SHA-512 or SHA-1. Files are never uploaded.
- Free, no sign-up
- Instant results
- Nothing is stored
Add a file to begin
Add two files to compare them, or one file and a published checksum to verify it.
File A
File B
How it works
Prove two files are identical
2. Pick an algorithm
SHA-256 is the standard choice. Match whatever algorithm the publisher of a download used.
3. Read the verdict
A clear match or mismatch, with each full hash ready to copy for your records.
Algorithms
Which hash should you use?
| Algorithm | Length | Use it for |
|---|---|---|
| SHA-256 | 64 hex characters | The everyday standard for verifying downloads and comparing files |
| SHA-384 | 96 hex characters | Stronger variant, used in some security and certificate workflows |
| SHA-512 | 128 hex characters | Longest output, popular for Linux distribution checksums |
| SHA-1 | 40 hex characters | Legacy only. Fine for spotting accidental changes, not for security |
FAQ
Common questions
Are my files uploaded?
No. Files are read and hashed by your own browser using its built-in Web Crypto API. Nothing is sent to Dueter or anywhere else, so it is safe for private documents.
What is a file hash?
A hash is a short fingerprint calculated from every byte of a file. Change a single byte and the hash changes completely, so two files with the same SHA-256 hash are, for practical purposes, identical.
How do I verify a download?
Copy the checksum published by the software maker, paste it into "Expected checksum", choose the same algorithm (usually SHA-256) and add the downloaded file. A match means the file arrived complete and unaltered.
Why is MD5 not available?
Browsers do not include MD5 in the Web Crypto API because it is no longer considered secure. If a site only publishes an MD5 checksum, ask for SHA-256 or use a desktop tool.
Is there a file size limit?
Files are read into memory, so the practical limit depends on your device. Files up to about 1 GB work well on most computers; larger files may be slow or fail on phones.
Does the file name or date affect the hash?
No. Only the contents are hashed. Two copies of the same file with different names or dates have the same hash.
More tools