Free Online Hash Generator — MD5, SHA-1, SHA-256, SHA-512
Generate cryptographic hashes from text or files instantly with this free online tool. Supports MD5, SHA-1, SHA-256, SHA-384, and SHA-512 algorithms. Includes HMAC generation with a secret key and a hash comparison tool to verify file integrity. No signup, no data stored — everything runs 100% in your browser using the Web Crypto API.
What is a Hash Function?
A cryptographic hash function takes an input (text, file, or any data) and produces a fixed-size string of characters called a hash or digest. The same input always produces the same hash, but even a tiny change in the input produces a completely different hash. Hash functions are one-way: you cannot reverse a hash to recover the original input.
Supported Hash Algorithms
- MD5 (128-bit) — Fast legacy hash, widely used for checksums. Not recommended for security purposes due to known collision vulnerabilities.
- SHA-1 (160-bit) — Successor to MD5, deprecated for certificates but still used for data integrity checks like Git commits.
- SHA-256 (256-bit) — Part of SHA-2 family, widely used in SSL/TLS, blockchain (Bitcoin), and digital signatures.
- SHA-384 (384-bit) — Truncated version of SHA-512, offering higher security than SHA-256 with slightly different performance characteristics.
- SHA-512 (512-bit) — Strongest SHA-2 variant, used when maximum security is required.
Common Use Cases
- File integrity verification — Compare file hashes to ensure downloads are not corrupted or tampered with
- Password storage — Websites store hashed passwords instead of plain text for security
- Digital signatures — Hash data before signing to ensure authenticity and non-repudiation
- Blockchain — SHA-256 is the backbone of Bitcoin and many other cryptocurrencies
- HMAC authentication — Verify message integrity and authenticity using a shared secret key
- Data deduplication — Identify duplicate files by comparing their hashes
Features
- Multiple algorithms — Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 simultaneously
- Text & file hashing — Hash typed text or drag-and-drop any file
- HMAC generation — Create keyed-hash message authentication codes with SHA algorithms
- Hash comparison — Paste two hashes to verify if they match (case-insensitive)
- Copy individual hashes — One-click copy for any algorithm's result
- Uppercase/lowercase toggle — Switch hash output format instantly
- Dark & light theme — Comfortable viewing in any environment
- 100% client-side — Uses Web Crypto API, no server requests
Frequently Asked Questions
Is my data safe?
Yes. All hashing happens entirely in your browser using the Web Crypto API (for SHA variants) and a pure JavaScript implementation (for MD5). No data is sent to any server.
What is HMAC?
HMAC (Hash-based Message Authentication Code) combines a cryptographic hash function with a secret key. It is used to verify both the integrity and authenticity of a message. HMAC-SHA256 is commonly used in API authentication, JWT tokens, and webhook verification.
Which hash algorithm should I use?
For security purposes (passwords, signatures), use SHA-256 or SHA-512. For quick checksums and file integrity, MD5 or SHA-1 are acceptable. Avoid MD5 and SHA-1 for any security-sensitive application.
Can I hash large files?
Yes. The tool reads files in your browser and processes them using the Web Crypto API. Most modern browsers handle files up to several hundred MB. For very large files, processing may take a few seconds.
Need More Developer Tools?
Check out our full collection of free tools — Base64 encoder, JSON formatter, QR code generator, password generator, and more.
Browse All Tools