File Hash & Checksum Calculator
Verify a download or check file integrity by computing its SHA-1, SHA-256 and SHA-512 hashes at once. The file is read locally with the browser's Web Crypto API and never uploaded, so even large or sensitive files stay on your device.
- 100% free
- Private & safe
- Runs in your browser
Your files are processed securely in your browser and are not uploaded to our servers.
Why use File Hash Calculator?
File Hash Calculator runs locally using your browser's built-in cryptography, so passwords, keys and hashes are never uploaded or logged.
- 100% private: files are processed in your browser and never uploaded.
- Completely free, with no account, no watermarks and no usage limits.
- Handles Input: any file; Output: SHA-1, SHA-256, SHA-512 (hex).
- Add any file.
- Works on any device — desktop, tablet and phone — and is fully keyboard accessible.
What it can do — and its limits
- Computes cryptographic checksums (such as SHA-256, SHA-1 and MD5) for any file.
- Lets you verify a download against a publisher's published hash for integrity.
- Hashing runs in your browser via the Web Crypto API; the file never leaves your device.
How to use File Hash Calculator
- Add any file.
- Its SHA-1, SHA-256 and SHA-512 hashes are computed.
- Compare against a published checksum.
- Copy any hash.
Examples
- Verifying an ISO download matches its published SHA-256.
- Checking two files are identical.
Worked example
Input
example.zip, compared to the publisher's listed SHA-256.
Output
SHA-256: 9f86d0818…f2b (64 hex characters). It matches the published value, so the download is intact.
Supported formats & limits
- Input: any file
- Output: SHA-1, SHA-256, SHA-512 (hex)
Hash algorithms at a glance
| Algorithm | Digest size | Use today |
|---|---|---|
| MD5 | 128-bit | Fast; broken — non-security checksums only |
| SHA-1 | 160-bit | Deprecated for security |
| SHA-256 | 256-bit | Recommended for integrity/security |
Limitations
- MD5 for files isn't included (Web Crypto doesn't support it); use the MD5 text tool for strings.
Common problems & fixes
The hash doesn't match the publisher's.
Re-download (the file may be corrupted), and confirm you're comparing the same algorithm.
Using MD5 or SHA-1 for security.
Both are broken against collisions — use SHA-256 for anything security-sensitive.
Sources & references
Last verified August 2026.
Frequently asked questions
Is my file uploaded?
No — hashing uses the browser's Web Crypto API entirely on your device.
Which algorithms are supported?
SHA-1, SHA-256 and SHA-512.
Can it handle large files?
Yes, within your browser's memory; very large files may take a moment.