#Free Hash Tool · SHA-1 · SHA-256 · SHA-512 · File Support
Free SHA-256 Hash Generator Online
Generate SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic hashes from text or any file. Uses the browser's native Web Crypto API — your data never leaves your device.
What is a Cryptographic Hash?
A cryptographic hash function takes any input (text or file) and produces a fixed-length string of hexadecimal characters — the hash or digest. The same input always produces the same hash, but even a single character change produces a completely different hash. Hashes are one-way: you cannot reverse a hash to get the original input. They are used to verify file integrity, store passwords securely, and generate checksums.
Hash Algorithm Comparison
| Algorithm | Output Length | Use Case | Security |
|---|---|---|---|
| SHA-1 | 160-bit (40 hex chars) | Legacy checksums, Git commits | Deprecated |
| SHA-256 | 256-bit (64 hex chars) | File integrity, passwords, Bitcoin | Secure |
| SHA-384 | 384-bit (96 hex chars) | TLS certificates, high-security | Very Secure |
| SHA-512 | 512-bit (128 hex chars) | Maximum security applications | Strongest |
FAQ — Hash Generator
Is my file uploaded to a server?
No. File hashing uses the browser's FileReader API and Web Crypto API — the file is read entirely in your browser memory. Nothing is uploaded anywhere.
What is SHA-256 used for?
SHA-256 is the most widely used cryptographic hash. It's used by Bitcoin for proof-of-work, by Linux distributions to publish ISO file checksums, by TLS certificates, and for password hashing (with bcrypt/scrypt/Argon2 wrappers).
Can I verify a file download with this tool?
Yes. Download the file, click "Hash a File" in the tool, select your file, and compare the generated SHA-256 hash with the checksum published by the software vendor.
Should I use SHA-1 for new projects?
No. SHA-1 is cryptographically broken for collision resistance. Use SHA-256 or SHA-512 for all new projects. SHA-1 is shown here for legacy compatibility (e.g., verifying old checksums).
Can I hash passwords with this tool?
SHA-256 alone is NOT suitable for password storage — it's too fast, making brute-force attacks practical. Use bcrypt, scrypt, or Argon2 for passwords. This tool is for file integrity and data checksums.