Hash Generator
Hash GeneratorCryptography
Algorithm Comparison
| Algorithm | Output Size | Security | Use Case |
|---|---|---|---|
| MD5 | 128 bits | Weak | Checksums only |
| SHA-1 | 160 bits | Deprecated | Legacy systems |
| SHA-256 | 256 bits | Strong | General purpose |
| SHA-384 | 384 bits | Strong | High security |
| SHA-512 | 512 bits | Very Strong | Maximum security |
About Hash Functions
A cryptographic hash function converts input data into a fixed-size string of characters. Hash functions are one-way - you cannot reverse the hash to get the original input.
SHA-256 is recommended for most security applications. MD5 and SHA-1 are only suitable for non-security purposes like checksums.
Related Tools
What is a Hash Function?
A cryptographic hash function is a mathematical algorithm that converts input data of any size into a fixed-size output called a hash or digest. Hash functions are one-way functions - it's computationally infeasible to reverse the process.
Key properties of cryptographic hash functions include: deterministic output (same input always produces the same hash), fast computation, collision resistance (hard to find two inputs with the same hash), and avalanche effect (small input changes produce dramatically different outputs).
Common applications include password storage, data integrity verification, digital signatures, and file checksums.
Common Use Cases
File Verification
Verify file integrity by comparing hashes before and after transfer or storage.
Password Storage
Store password hashes instead of plain text passwords for security.
Data Deduplication
Identify duplicate files by comparing their hash values.
Digital Signatures
Create digital signatures by signing the hash of a document.
Frequently Asked Questions
Which hash algorithm should I use?
For security applications, use SHA-256 or SHA-512. MD5 and SHA-1 are considered cryptographically broken and should only be used for non-security purposes like checksums where collision resistance isn't critical.
Can I reverse a hash to get the original text?
No. Hash functions are one-way by design. You cannot mathematically reverse a hash to get the original input. However, attackers may use rainbow tables or brute force to find inputs that produce a specific hash.
Why is MD5 considered insecure?
MD5 is vulnerable to collision attacks - researchers have demonstrated practical methods to create two different inputs that produce the same MD5 hash. This makes it unsuitable for security applications.
Is my data secure using this tool?
Yes. All hash calculations are performed entirely in your browser using JavaScript and the Web Crypto API. No data is sent to any server. Your input never leaves your device.