How to use the SHA256 Generator Online
1. Type or paste the text you want to hash into the input field.
2. Choose the output encoding: Hex (default) or Base64.
3. The SHA-256 hash appears instantly — click Copy to save it.
What is it?
SHA-256 is a cryptographic hash function that produces a 256-bit digest (hash) from any input. Hash functions are one-way — given the hash, it is computationally infeasible to recover the original input. Even a tiny change to the input produces a completely different hash (the "avalanche effect").
Common uses include: verifying file integrity (checksums), storing password hashes in databases, generating cache keys, creating digital signatures, and building content-addressable storage. Note: SHA-256 should not be used for password hashing in production — use bcrypt or Argon2 instead, which are designed to be slow.
Example
Hello, World!
dffd6021bb2bd5b0af676290809ec3a53191dd81c7f70a4b28688a362182986d
SHA-256 is the industry standard for checksums, TLS certificates, and code signing.
Benefits
Generate collision-resistant checksums for file and data verification
SHA-256 is the current standard for integrity verification — collision resistance makes it suitable for production security use.
Verify API webhook payloads haven't been tampered with
Compute SHA-256 of the raw webhook body and compare against the signature header to confirm authenticity.
Produce deterministic content identifiers for caching
SHA-256 of the same input always produces the same output — reliable as cache keys, deduplication hashes, and ETag values.
Satisfy compliance requirements for data integrity verification
SHA-256 meets NIST, FIPS 180-4, and most regulatory requirements for cryptographic hash functions in security-sensitive systems.
Frequently asked questions
Is SHA-256 secure for passwords?
No. SHA-256 is a fast general-purpose hash, which makes it unsuitable for password storage. Attackers can test billions of guesses per second using GPUs. Use a dedicated password hashing function like bcrypt, scrypt, or Argon2 for passwords.
What is the difference between Hex and Base64 encoding?
Both represent the same hash in different formats. Hex uses characters 0-9 and a-f (longer, all ASCII). Base64 uses A-Z, a-z, 0-9, +, / (shorter, URL-safe with modifications). Choose based on where you need to use the hash.
Can two different inputs produce the same hash (collision)?
In theory yes (collision), but for SHA-256 and SHA-512 collisions are considered computationally infeasible. SHA-1 has known theoretical weaknesses and should be avoided for security-sensitive applications.