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File Hash Calculator

Drop one or more files and get every checksum you need in a single pass, without uploading anything.

Processed locally in your browser

Options

What is File Hash Calculator?

A file hash is a fingerprint of a file’s exact bytes. Software vendors publish SHA-256 or SHA-512 checksums next to downloads so you can confirm that what you received is byte-identical to what they released, and backups or transfers can be checked the same way.

This calculator reads each file in 4 MB chunks with a WebAssembly hasher, so files of several gigabytes never have to fit in memory. Choose the algorithms with the checkboxes; all of them are computed together in one pass. Results list the file name, size and every digest, and can be downloaded as a checksum file.

How does it work?

  1. Drop one or several files onto the drop zone, or click to browse.
  2. Tick the algorithms you need (MD5, SHA-1, SHA-256, SHA-384, SHA-512, CRC32) and choose uppercase if you prefer.
  3. Press Calculate hashes, watch the progress bar, then copy any digest or download the checksum text.

Common use cases

  • Checking an ISO, installer or firmware image against the SHA-256 published by the vendor.
  • Confirming that a large backup or upload arrived intact.
  • Detecting duplicate files by comparing digests.
  • Producing a SHA-256 manifest for the files you distribute.

Examples

Drop one or more files and get every checksum you need in a single pass, without uploading anything.

Privacy

File Hash Calculator runs entirely in your browser. The text or files you provide are processed on your device and are not uploaded, logged or stored on our servers.

Limitations

Files stay on your device and are read in chunks (limit 2 GB per file; above 500 MB it takes noticeably longer). A matching hash proves the file equals the reference, not that the file is safe. MD5 and SHA-1 detect accidental corruption only.

Frequently asked questions

Is my file uploaded anywhere?

No. The file is read locally by your browser and hashed in a background worker. Nothing leaves your device and there is no server involved.

Which algorithm should I compare?

Use the one the publisher provides. If you can choose, SHA-256 or SHA-512 are preferred; MD5 and SHA-1 are only suitable to detect accidental damage.

How long does a big file take?

Hashing speed depends on your disk and CPU, typically hundreds of MB per second for one algorithm. Selecting fewer algorithms makes it faster.

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