Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes instantly in your browser
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About Hash Generator
SHA hashes use the native Web Crypto API (crypto.subtle). MD5 is implemented in pure JavaScript. All computation happens in your browser — no data is ever sent to a server.
How to Use This Tool
- Type or paste the text you want to hash into the input field.
- Select one or more hash algorithms: MD5, SHA-1, SHA-256, or SHA-512.
- Hashes are generated automatically as you type.
- Click the copy icon next to any hash to copy it to your clipboard.
Common Use Cases
- Verifying file integrity by comparing a downloaded file's hash against the publisher's checksum.
- Generating SHA-256 hashes of passwords before storing them in a database (always use a proper KDF like bcrypt in production).
- Creating unique identifiers or cache-busting keys from content strings.
- Checking whether two pieces of text are identical by comparing their hashes.
- Learning and demonstrating the deterministic and one-way nature of cryptographic hash functions.
Frequently Asked Questions
What is the difference between MD5, SHA-1, SHA-256, and SHA-512?
MD5 produces a 128-bit (32 hex character) digest and is considered cryptographically broken — do not use it for security purposes. SHA-1 produces a 160-bit digest and is also deprecated for security uses. SHA-256 and SHA-512 are part of the SHA-2 family and are currently considered secure for cryptographic purposes.
Can I reverse a hash to get the original text?
No. Cryptographic hash functions are one-way: it is computationally infeasible to recover the original input from its hash. However, short or common inputs can be looked up in precomputed "rainbow tables".
Is hashing the same as encryption?
No. Encryption is reversible with a key; hashing is a one-way function with no key. Hashing is used to verify data integrity, not to protect confidentiality.
Should I use this tool to hash passwords for a production application?
No. Password storage requires slow, salted key derivation functions such as bcrypt, scrypt, or Argon2 — not fast hash functions like SHA-256. Fast hashes make brute-force attacks trivially easy with modern hardware.