Hash Generator
Generate SHA-1 / SHA-256 / SHA-384 / SHA-512 hashes from text or files instantly.
Powered by Web Crypto API — no server load.
About
A free online tool that instantly generates SHA-1, SHA-256, SHA-384, and SHA-512 hash values from text or files directly in your browser using the standard Web Crypto API.
Use it to verify file integrity after downloads, confirm API signatures during development, or check password hashes. No data ever leaves your device.
How to Use
Choose Mode
Select the "Text" tab to type a string, or "File" tab to drop any file.
Enter Input
Type text for instant hashing. For files, computation starts automatically after selection.
Copy Result
All four hash values appear simultaneously. Click "Copy" next to any algorithm to copy it.
Glossary
- Hash Function
- A one-way function converting arbitrary data into a fixed-length digest. The same input always produces the same output.
- SHA-256
- A 256-bit hash from the NSA-designed SHA-2 family. Widely used in TLS/SSL and cryptocurrencies — the current standard.
- SHA-512
- A 512-bit SHA-2 hash. More secure than SHA-256 but produces longer output. Faster on 64-bit systems.
- SHA-1
- A 160-bit hash function. Collision vulnerabilities have been found; not recommended for security purposes.
- Checksum
- A verification value used to confirm data integrity. Used to detect tampering in downloaded files.
- Collision Resistance
- The property that makes it unlikely for two different inputs to produce the same hash value.
- Web Crypto API
- A browser-native cryptographic API enabling secure SHA hash computation from JavaScript.
FAQ
- Q.Is my data sent to a server?
- No. All computation is done in your browser using the Web Crypto API. No text or file data is transmitted externally.
- Q.Is MD5 supported?
- MD5 is not supported by the browser's Web Crypto API for security reasons. We support SHA-1 / SHA-256 / SHA-384 / SHA-512.
- Q.Can I hash large files?
- Yes. Files are processed as ArrayBuffers so large files work fine, subject to available browser memory.
- Q.Which algorithm should I choose?
- SHA-256 or above is recommended for security purposes. SHA-1 is legacy-only. SHA-512 is the strongest option.
- Q.Can I reverse a hash back to the original?
- No. Hash functions are one-way. It is computationally infeasible to recover the original data from a hash.
Use Cases
🔍 File Integrity
Verify that downloaded software matches the official checksum.
🔐 Password Security
Store and compare SHA-256 hashes of passwords instead of plaintext.
💻 API Signature Verification
Verify webhook and request signatures during development.
📝 Data Integrity
Confirm that text or data has not been altered using hash comparison.