File Hash — Calculate MD5, SHA-1, and SHA-256 Checksums
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for any file. Verify downloads and detect tampering. Free online tool.
File hashes (checksums) let you verify that a file has not been corrupted or tampered with during transfer. The MyPDF File Hash tool calculates MD5, SHA-1, SHA-256, and SHA-512 hashes for any file directly in your browser — nothing is uploaded to a server.
How to Calculate a File Hash
- Upload — Drop any file into the tool.
- Calculate — The tool computes multiple hash algorithms simultaneously.
- Compare — Copy the hash and compare it against the expected value provided by the file source.
Hash Algorithms
| Algorithm | Output Length | Security Level | Common Use |
|---|---|---|---|
| MD5 | 32 hex chars (128-bit) | Weak (collisions known) | Quick integrity checks |
| SHA-1 | 40 hex chars (160-bit) | Weak (deprecated) | Git commits, legacy systems |
| SHA-256 | 64 hex chars (256-bit) | Strong | Software downloads, certificates |
| SHA-512 | 128 hex chars (512-bit) | Strongest | High-security verification |
Practical Tips
- Always verify software downloads. Compare the SHA-256 hash of a downloaded installer against the hash published on the developer's website to ensure the file was not tampered with.
- Use SHA-256 for serious verification. MD5 and SHA-1 are vulnerable to collision attacks. SHA-256 is the recommended minimum for security-sensitive use.
- Hash before and after transfer. Calculate the hash on the source machine, transfer the file, then recalculate on the destination to confirm integrity.
Is the file uploaded to a server?
No. All hash calculations happen locally in your browser using the Web Crypto API. Your file never leaves your device.
Can I hash multiple files at once?
Yes. Drop multiple files and the tool calculates hashes for each one, making it easy to verify a batch of downloads.
What if the hashes do not match?
A mismatch means the file has been altered — it may be corrupted, incomplete, or tampered with. Re-download the file from the original source and check again.
Related Tools
- Base64 Encode/Decode — Encode files to Base64 text strings.
- Password Archive — Encrypt files with AES-256 protection.
- Extract Text — Extract text content from documents.
- Compress PDF — Reduce PDF file size before sharing.