Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text.
Hash Algorithm Comparison
All four algorithms are generated simultaneously. Choose the right one for your use case using this reference.
| Algorithm | Output bits | Hex chars | Security | Use case |
|---|---|---|---|---|
| MD5 | 128 | 32 | Broken | Checksums only (not security) |
| SHA-1 | 160 | 40 | Deprecated | Legacy systems only |
| SHA-256 | 256 | 64 | ✅ Secure | TLS, code signing, JWT |
| SHA-512 | 512 | 128 | ✅ Secure | High-security applications |
Common Uses for Hash Functions
File Integrity Verification
Hash a downloaded file and compare to the publisher’s checksum to confirm no corruption or tampering occurred in transit.
Password Storage
Developers store hashed passwords in databases instead of plain text. (Use bcrypt/Argon2, not MD5/SHA for this.)
API Authentication
HMAC-SHA256 is used to sign API requests, ensuring the request has not been tampered with and comes from an authenticated source.
Data Deduplication
Hash file or block content to quickly detect duplicates without comparing byte-by-byte — used by cloud storage systems.
Digital Signatures
Documents are hashed, then the hash is encrypted with a private key to create a verifiable digital signature.
Caching Keys
Hash request parameters or content to generate cache keys in CDNs, Redis, and server-side caching systems.
Important Security Notes
- →Never use MD5 or SHA-1 for passwords. These are one-way hashes, not password hashing functions. Use bcrypt, scrypt, or Argon2 for passwords — they include salting and are intentionally slow to resist brute-force attacks.
- →Hashing is not encryption. You cannot recover the original input from a hash. If you need to reverse the process, you need encryption (AES), not hashing.
- →SHA-256 is the current minimum standard. TLS certificates, code signing, and JWT tokens use SHA-256 as the minimum. SHA-512 provides extra security margin at minimal performance cost.
- →Same input always gives same output. Hash functions are deterministic. This is both useful (checksums) and a weakness for passwords (rainbow table attacks).
Frequently Asked Questions
What is a cryptographic hash function?
A hash function takes any input (text, file, data) and produces a fixed-length string called a hash or digest. The same input always produces the same output, but even a tiny change in input produces a completely different hash. It is a one-way function — you cannot reverse a hash to get the original input.
What is the difference between MD5, SHA-1, SHA-256, and SHA-512?
MD5 produces a 128-bit (32 hex character) hash — fast but considered cryptographically broken for security use. SHA-1 produces 160 bits (40 chars) — also deprecated for security. SHA-256 (256 bits, 64 chars) and SHA-512 (512 bits, 128 chars) are part of the SHA-2 family and are currently considered secure for most applications.
Is MD5 still safe to use?
MD5 is no longer considered secure for cryptographic purposes — collision attacks have been demonstrated (two different inputs producing the same hash). It is still useful for checksums and data integrity where security is not a concern, but never use MD5 for password hashing or digital signatures.
Which algorithm should I use?
For general checksums and non-security data integrity: MD5 or SHA-1 are fine. For password hashing: use bcrypt, scrypt, or Argon2 (not any SHA variant). For digital signatures and certificates: SHA-256 minimum. For maximum security margin: SHA-512.
Can I hash a file, not just text?
This tool currently hashes text input. To hash a file, copy its text content and paste it in. For binary file checksums, use platform tools like sha256sum (Linux/Mac) or CertUtil (Windows).
Is my text sent to your servers?
No. Hashing runs entirely in your browser using the built-in Web Crypto API. Your input is never transmitted to any server, logged, or stored.
What is a hash collision?
A collision is when two different inputs produce the same hash output. For MD5 and SHA-1, collisions have been demonstrated in practice. For SHA-256 and SHA-512, no practical collision has been found.
Is this hash generator free?
Completely free. No account, no limits. Type or paste any text and get hashes for all four algorithms simultaneously.
What users say about Hash Generator
Real feedback from ToolsBear users — reviewed and approved by our team.