File Hash Calculator
About File Hash Calculator
Compute the SHA-256 and SHA-1 hash of any file to get a unique checksum that identifies its exact contents. Use it to verify a download is not corrupted, confirm two files are identical, detect tampering, and check integrity before deploying or archiving. The hash is calculated entirely in your browser using the Web Crypto API, so the file never leaves your device — making it safe for sensitive documents and unpublished binaries.
How To Use
- Choose a file from your device, or drag and drop it into the workspace.
- The tool computes the SHA-256 and SHA-1 hashes locally using the Web Crypto API.
- Copy the hash values to compare against a published checksum or share for verification.
Example
Input: A downloaded installer or archive you want to verify before running.
Output: A SHA-256 checksum you can compare against the publisher's published hash to confirm the file is intact.
Who Uses File Hash Calculator
- People who want quick private utilities (timers, PDF, emoji, etc.).
- Anyone avoiding installs and uploads.
- Users who value private — files and text stay on your device and are never uploaded to a server.
Frequently Asked Questions
What is a file hash used for?
A hash is a short fingerprint of a file's contents. Compare it against a published checksum to confirm a download is uncorrupted and untampered, or use it to prove two files are byte-for-byte identical.
Why SHA-256 and SHA-1?
SHA-256 is the modern standard for integrity checking. SHA-1 is included for compatibility with older checksums and legacy systems.
Is my file uploaded anywhere?
No. The hash is computed in your browser using the Web Crypto API. The file never leaves your device, which makes the tool safe for confidential documents.
Can I hash multiple files at once?
This tool hashes one file at a time. For batch checksumming and verified copying, use the checksum file mover tool in the same category.