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About Hash Functions
A cryptographic hash function converts input data of any size into a fixed-size string of characters (hash). The same input always produces the same hash, but even a tiny change in input creates a completely different hash.
Available Algorithms
- SHA-1 - 160-bit hash. Deprecated for security-critical uses but still used for checksums. Not recommended for passwords.
- SHA-256 - 256-bit hash. Part of SHA-2 family. Widely used, secure, and recommended for most purposes.
- SHA-384 - 384-bit hash. Part of SHA-2 family. More secure than SHA-256, used for high-security applications.
- SHA-512 - 512-bit hash. Part of SHA-2 family. Most secure SHA-2 variant, produces longest hash.
Common Use Cases
- Verify file integrity (checksums)
- Generate unique IDs from content
- Password storage (with salt, use bcrypt/argon2 for production)
- Digital signatures
- Blockchain and cryptocurrency
- API request signing
Important: This tool uses browser-based hashing (Web Crypto API). For password hashing, use specialized algorithms like bcrypt, argon2, or scrypt with proper salting. Never store passwords as plain hashes.
Updated: October 2026
Note: All hashing happens in your browser. No data is sent to any server.
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Frequently Asked Questions
What is a cryptographic hash?
A cryptographic hash function converts input data of any size into a fixed-size string of characters (hash). The same input always produces the same hash, but even a tiny change in input creates a completely different hash. Hashes are one-way (you cannot reverse a hash to get the original input).
Which hash algorithm should I use?
For most purposes, use SHA-256 (widely used, secure, good balance). Use SHA-512 for maximum security or when working with sensitive data. Avoid SHA-1 for security-critical applications (it has known vulnerabilities). MD5 is not available in this tool as it is considered broken for security.
Can I use this for password hashing?
No! Never use plain SHA hashes for storing passwords in production. This tool is for education and testing only. For password storage, use specialized algorithms like bcrypt, argon2, or scrypt with proper salting. Plain SHA hashes are vulnerable to rainbow table attacks.
What is the difference between SHA-256 and SHA-512?
SHA-256 produces a 256-bit (64-character) hash, while SHA-512 produces a 512-bit (128-character) hash. SHA-512 is more secure but produces longer hashes. SHA-256 is faster and sufficient for most use cases. Both are part of the SHA-2 family and are considered secure.
What are hashes used for?
Common uses: verifying file integrity (checksums), generating unique IDs from content, password storage (with proper salting), digital signatures, blockchain and cryptocurrency, API request signing, data deduplication, and ensuring data hasn't been tampered with.
Is this hash generator secure?
The hash generation uses the browser's native Web Crypto API, which is cryptographically secure. However, this tool is best for learning, testing, and non-sensitive use cases. For production cryptographic operations, use server-side libraries and proper key management.