Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text or files. All processing happens in your browser — nothing is uploaded to any server.
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A cryptographic hash function converts any input data into a fixed-size string of characters. The output (called a "hash" or "digest") is unique to each input — even a tiny change in the input produces a completely different hash. This makes hashing essential for data integrity verification, password storage, and digital signatures.
| Algorithm | Output Size | Security | Speed | Use Case |
|---|---|---|---|---|
| MD5 | 128 bits | ❌ Broken | Very Fast | Checksums only (not security) |
| SHA-1 | 160 bits | ⚠️ Weak | Fast | Legacy systems (being phased out) |
| SHA-256 | 256 bits | ✅ Strong | Moderate | Bitcoin, SSL, general security |
| SHA-512 | 512 bits | ✅ Very Strong | Moderate | High-security applications |
Both MD5 and SHA-1 are vulnerable to collision attacks, meaning two different inputs can produce the same hash. In 2017, Google demonstrated the first practical SHA-1 collision (SHAttered attack). For security-critical applications, always use SHA-256 or SHA-512.
No. Hash functions are one-way — you cannot reverse a hash to get the original input. This is by design. However, attackers can use rainbow tables or brute force to find inputs that match a known hash.
For security purposes, use SHA-256 or SHA-512. MD5 and SHA-1 are only suitable for non-security checksums (like verifying file downloads).