What is File Hash Checker?

A file checksum calculator generates cryptographic hash values (MD5, SHA-1, SHA-256, SHA-512, BLAKE2b) for any file. Use it to verify file integrity after downloads, detect tampering, or compare two files. Everything runs locally — your files never leave your device.

All five hashes (MD5, SHA-1, SHA-256, SHA-512, and BLAKE2b) are computed on your device, never uploaded anywhere. Drop a published checksum into the verify field and the tool tells you instantly whether the bytes match. Switch to Batch to hash a whole folder of files at once, or Text to hash a typed or pasted string. Useful for ISO downloads, signed software releases, and confirming that two files are byte-identical.

How to use

1. Drop a file or click to select one from your device.
2. View the computed MD5, SHA-1, SHA-256, SHA-512, and BLAKE2b checksums instantly.
3. Paste a known checksum to verify it matches, or copy any hash to share.

When to use

• Verifying a Linux ISO or Docker image against the publisher's official checksum.
• Confirming two files on different machines are bit-for-bit identical.
• Spotting accidental file corruption after a long download or USB transfer.

Result

After downloading a Linux ISO, paste the SHA-256 from the website into the verify field. A green check confirms the file wasn't corrupted during download.

FAQ

Which hash should I trust for a real security check?

Use SHA-256 or SHA-512 for any tamper-detection scenario. MD5 and SHA-1 are fine for catching accidental corruption but have known collision attacks, so a determined attacker could substitute a file that produces the same MD5 or SHA-1 digest.

Are big files actually safe to hash here?

The whole file is read into memory once via FileReader, so a 4 GB ISO is fine on a desktop but might struggle on a phone with 4 GB of RAM. If the tab crashes on a huge file, retry on a machine with more memory.

Why are the hashes for an identical-looking file suddenly different?

Hashes change with any byte-level difference: line-ending conversion (CRLF vs LF), trailing whitespace, image metadata edits, or even an extra newline. Visually identical does not mean byte identical, and even a one-bit change cascades through the entire digest.

Does the file get uploaded somewhere when I compute its hash?

No. The computation happens entirely on your device with WebCrypto; nothing leaves the page. You can disconnect from the internet, hash a file, and the result will still appear. The file picker reads bytes locally only.

Is hashing the same as encrypting?

No. Hashing is one-way: any input maps to a fixed-length fingerprint, and you can't reverse it back to the original. Encryption is reversible with a key. Hashes are used to verify integrity, not to keep contents secret.

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