Generate SHA hashes from text
Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes from text online. Free cryptographic hash generator tool.
Type or paste the text you want to hash into the input field. The tool accepts any text input including passwords, files content, API keys, or any string you need to generate a hash for.
The tool instantly generates hash values in multiple algorithms: SHA-1, SHA-256, SHA-384, and SHA-512. All hashes are computed simultaneously for easy comparison.
Copy any hash value to your clipboard by clicking the copy button next to the desired algorithm's output.
Use the generated hashes for data integrity verification, password storage, digital signatures, or any application requiring cryptographic hash functions.
Hash functions are fundamental to software security. Developers use them for password storage (never store plaintext passwords), data integrity verification (checking if a file has been modified), digital signatures, API authentication tokens, and content-addressable storage systems.
Verifying file integrity is a common use case. By comparing the hash of a downloaded file against the publisher's provided hash, you can confirm the file has not been corrupted or tampered with during transfer.
The tool generates hashes using the Web Crypto API, which provides native browser implementations of cryptographic algorithms. This ensures correct, standards-compliant hash computation.
All hash computation happens in your browser. Text you are hashing, which may include sensitive data like passwords or API keys, is never transmitted over the network.
Having multiple hash algorithms available simultaneously lets you compare output lengths and choose the appropriate algorithm for your specific use case: SHA-256 for most purposes, SHA-512 for maximum security.
SHA-256 is the current recommended standard for most hashing needs. SHA-1 is considered cryptographically weak and should be avoided for security-sensitive applications.
When hashing passwords for storage, always use a dedicated password hashing algorithm (bcrypt, scrypt, Argon2) with salt, not a general-purpose hash function like SHA-256.
Hash functions are one-way: you cannot reverse a hash to get the original text. If you need reversible transformation, use encryption instead.
Two different inputs can theoretically produce the same hash (a collision), but this is extremely unlikely with SHA-256 and SHA-512. SHA-1 has known practical collision attacks.
A hash function takes any input data and produces a fixed-size output (the hash or digest) that uniquely represents that input. Hash functions are used for password storage (storing hashes instead of plaintext passwords), data integrity verification (detecting file modifications), digital signatures, authentication tokens, blockchain technology, and content-addressable storage. A good hash function is deterministic (same input always produces same output), fast to compute, and practically impossible to reverse.
For most purposes, SHA-256 provides an excellent balance of security and performance. It produces a 256-bit (64-character hex) hash that is secure against all known attacks. Use SHA-512 when you need extra security margin or when working with systems that require it. Avoid SHA-1 for security-sensitive applications as practical collision attacks exist. For password hashing specifically, use dedicated algorithms like bcrypt, scrypt, or Argon2 instead of SHA functions.
No. Cryptographic hash functions are designed to be one-way functions. It is computationally infeasible to determine the original input from a hash output. This property is what makes hashing useful for password storage and data integrity verification. While rainbow tables and brute force attacks can find inputs that produce a given hash for short/common strings, this does not constitute reversing the function.
Hashing is a one-way process: data goes in, a fixed-size hash comes out, and you cannot get the original data back. Encryption is a two-way process: data is encrypted with a key, and can be decrypted back to the original using the correct key. Use hashing when you need to verify data without needing the original (like passwords). Use encryption when you need to protect data that must be recovered later (like stored documents).
Yes. All hash computation in this tool happens entirely in your browser using the Web Crypto API. The text you input is never sent to any server, never transmitted over the network, and never stored anywhere. This makes the tool safe for generating hashes of sensitive data including passwords, API keys, and confidential content.
This property is called the avalanche effect, and it is a crucial feature of good hash functions. Even a single bit change in the input produces a drastically different hash output. This ensures that similar inputs do not produce similar hashes, making it impossible to deduce information about the input by analyzing the hash. It also means you cannot predict how a change to the input will affect the hash output.