Try the File Hash & Checksum Verifier
Drop any file to compute its real SHA-256, SHA-1 and MD5 checksum locally with the Web Crypto API, then paste an expected hash to see instantly whether it.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
What is the File Hash & Checksum Verifier?
Software downloads, ISOs, firmware images and archives are often published with a checksum so you can confirm the file you received is exactly the one the publisher built — not corrupted in transit and not tampered with. This tool computes the real SHA-256, SHA-1 and MD5 hash of any file you drop in, using the browser's native Web Crypto API for SHA-256/SHA-1 and a from-scratch, test-vector-verified implementation of MD5 (which browsers don't expose natively), entirely on your device.
Paste the checksum the publisher listed into the 'expected hash' field and the tool automatically detects which algorithm it is by length (32 hex characters = MD5, 40 = SHA-1, 64 = SHA-256) and tells you in plain terms whether it matches — no manual copy-paste comparison of long hex strings by eye.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
SHA-256, SHA-1 and MD5 computed together from the same file, no need to guess which one a publisher used.
Paste a published checksum and the tool detects the algorithm by length and flags a real match or mismatch.
The file is read and hashed with the Web Crypto API in your browser; nothing is uploaded anywhere.
Software installers, ISOs, archives, documents — anything with a published checksum.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Anyone downloading an OS image or installer
Confirm the file wasn't corrupted mid-download or swapped by a compromised mirror before running it.
Try it freeDevelopers verifying a build artifact
Confirm a CI-built file matches the checksum recorded at build time.
Try it freeAnyone who received a file from an untrusted source
Compare it against a checksum obtained through a separate, trusted channel to catch tampering.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This utility | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Why does the file's hash matter?
A cryptographic hash is a fixed-length fingerprint of a file's exact bytes — if even one bit changes (from corruption, a bad download or tampering), the entire hash comes out completely different, so a match is strong evidence the file you have is identical to the one the publisher hashed.
Which algorithm should I trust most?
SHA-256 is the modern standard and by far the strongest of the three offered here. MD5 and SHA-1 are both considered cryptographically broken for security purposes (though still fine for accidental-corruption checks) and are included mainly because many older published checksums still use them.
Is the file uploaded anywhere to compute the hash?
No — the file is read and hashed entirely in your browser using the Web Crypto API (for SHA-256/SHA-1) and a local JavaScript MD5 implementation; it never leaves your device.
What does a mismatch mean?
The file you have is not byte-for-byte identical to the one the checksum was generated from — it could be a partial/corrupted download, a different version, or in rare cases a tampered file. Re-download from the official source rather than running it.
Can this hash a very large file?
Yes, up to whatever your browser can hold in memory to read the file — very large files (multiple gigabytes) may take longer and use more memory.
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Try the File Hash & Checksum Verifier now
Compute a file's real SHA-256, SHA-1 and MD5 checksum in your browser and compare it to. Free to use.
Try it free