File Hash Calculator

The File Hash Calculator computes SHA-1, SHA-256, SHA-384, and SHA-512 digests for any file using the browser's native Web Crypto API, so nothing ever leaves your machine. Drag a file onto the drop zone or pick one with the file chooser, and all four hashes appear as copyable hex strings alongside per-algorithm compute times in milliseconds. A file info card shows the name, exact byte size, a readable size, and the MIME type the browser detected. Recompute re-runs the hashes against the same file, and Download report exports a text file with the file metadata, timestamps, and every digest — handy for attaching to release artifacts. Files over 500 MB are blocked to protect browser memory, and anything above 10 MB triggers a warning that the UI may pause briefly. The tool is candid about its crypto guidance: SHA-1 is marked broken and should never be used for security, and hashes cover raw bytes only, excluding names and dates. For verifying downloads, integrity-checking backups, or generating a release checksum file, this local SHA-256 hash calculator delivers trustworthy output without uploading sensitive files to a web service.

1. 1

   Drag a file onto the dashed drop zone, or click "Choose a file" and pick one.

2. 2

   Wait for the "Hashing…" state to finish — all four algorithms run in sequence.

3. 3

   Read each hash row under the Hashes card and click "Copy" to grab any digest.

4. 4

   Click "Recompute" to re-run hashes on the same file, or "Download report" to export everything.

5. 5

   Check the File info card for the detected type and readable size.

• Verifying that a downloaded installer matches the publisher's published SHA-256.
• Integrity-checking backups before migrating them to cold storage.
• Generating a checksums file to ship alongside open-source release binaries.
• Confirming two copies of a file are identical by comparing digests.
• Auditing which files changed between two exports without opening them.
• Hashing sensitive documents locally when company policy forbids uploads.

• Rely on SHA-256 or SHA-512 for integrity; treat SHA-1 results as reference-only.
• Use the Download report option so file metadata travels with the hashes.
• Keep files under the 500 MB limit and expect brief UI pauses above 10 MB.
• Compare against hashes from an independent source, not just a second copy you made.
• Remember the hash covers raw bytes only — renaming a file does not change it.

• Copy any digest with one click — each row has its own Copy button.
• Watch the ms badges to compare algorithm speed on your hardware.
• The report file name follows the pattern <filename>-hashes.txt.
• Hash the same release from two machines and diff the SHA-256 rows.