File Checksum
SHA hashes for any file, and compare against a published one.
About File Checksum
File Checksum computes SHA-1, SHA-256 and SHA-512 for any file and compares them against a published hash. This is how you verify a download arrived intact and was not tampered with in transit — routine for operating system images, installers and anything security sensitive. The file is read locally and never uploaded.
How to use it
- Drop in the downloaded file.
- Click Checksum and wait — large files take a moment.
- Paste the hash from the download page to compare. A match confirms the file is identical.
Questions
What does a matching checksum prove?
That your copy is byte-for-byte identical to the one the publisher hashed. It catches corrupted downloads and files altered in transit.
What does it not prove?
That the file is safe. If an attacker controls the site, they can publish a hash matching their own malicious file. The checksum must come from a source you trust independently.
Which algorithm should I compare?
Whichever the publisher lists — usually SHA-256. The tool computes all three and tells you which one matched.
Is there a file size limit?
The file is read into memory, so multi-gigabyte files may fail on a device with limited RAM.
File Checksum is free and runs entirely in your browser. No account, no upload, no watermark, no limit on use.