Hash Generator
Generate cryptographic hashes (SHA-1, SHA-256, SHA-384, SHA-512) from any text, computed locally in your browser. Free and private.
How to use the Hash Generator
- 1Type or paste the text you want to hash into the input box. The field accepts anything from a single word to a long block of text or JSON.
- 2Select which algorithm you need using the SHA-1, SHA-256, SHA-384, or SHA-512 toggle. You can switch algorithms at any time to compare digests.
- 3The hash is computed instantly as you type, using your browser's Web Crypto API. No button click is required, though a Generate button is available if you prefer manual runs.
- 4Read the resulting hexadecimal digest in the output area, where the character length reflects the chosen algorithm (64 for SHA-256, 128 for SHA-512).
- 5Click the Copy button to place the digest on your clipboard for pasting into a checksum comparison, test file, or config.
- 6Clear the input to reset the tool, or paste a new value to fingerprint something else. Nothing is saved between sessions.
About the Hash Generator
Hash Generator turns any text you type into a fixed-length cryptographic digest using four members of the SHA family: SHA-1, SHA-256, SHA-384, and SHA-512. Everything happens inside your browser through the native Web Crypto API (crypto.subtle.digest), so the string you paste never leaves your machine, never touches a server, and is never logged. That local-only design is what makes the tool safe for hashing sensitive values like passwords, API keys, or configuration secrets while you experiment.
A hash is a one-way function: the same input always produces the same output, but you cannot reverse the digest back into the original text. SHA-256 returns a 64-character hexadecimal string, SHA-512 returns 128 characters, and even a single changed letter cascades into a completely different result. This makes hashes ideal for verifying that data has not been altered.
Concrete uses show up constantly in real work. Developers compare a file's or message's SHA-256 against a published checksum to confirm a download was not tampered with. Backend engineers pre-compute expected digests when writing tests for integrity checks. People setting up webhooks or signing flows generate reference hashes to validate signatures. Writers and researchers create content fingerprints to detect whether a document changed between versions. Anyone learning cryptography can watch, in real time, how avalanche behavior works by editing one character.
Practical tips: SHA-1 is included for legacy compatibility (Git object IDs, old checksums) but is considered cryptographically broken for collision resistance, so prefer SHA-256 or higher for anything security-critical. Hashing is case-sensitive and whitespace-sensitive, so a trailing space or newline changes the digest entirely. If you need password storage rather than verification, remember that a raw SHA hash is not enough on its own; production systems add salting and a slow algorithm like bcrypt or Argon2. For quick verification, integrity checks, and learning, this generator gives you instant, private, standards-based results with no installation and no upload.
Frequently asked questions
Why does SHA-256 produce a shorter string than SHA-512?
The number in the name is the digest size in bits. SHA-256 outputs 256 bits, which is 32 bytes shown as 64 hexadecimal characters. SHA-512 outputs 512 bits, or 64 bytes shown as 128 hex characters. SHA-384 is a truncated SHA-512 variant that returns 96 characters. Longer digests offer a larger space and are harder to brute-force, but for most integrity checks SHA-256 is the practical standard.
Can I get the original text back from a hash?
No. SHA hashing is a one-way function by design, so there is no mathematical way to reverse a digest into its input. Sites that appear to 'decrypt' hashes are really just looking up precomputed dictionaries of common inputs. If your original text was long or random, it cannot be recovered from the hash alone.
Is it safe to hash passwords or secrets here?
For experimenting and verification, yes, because the computation runs entirely in your browser via the Web Crypto API and the input is never uploaded, stored, or transmitted. However, a plain SHA hash is not a secure way to store passwords in a real application. Production password storage needs a salt plus a deliberately slow algorithm like bcrypt or Argon2 to resist offline cracking.
Should I still use SHA-1?
Only for legacy compatibility. SHA-1 remains useful for reproducing older checksums or Git object identifiers, but it has known collision weaknesses and is no longer considered safe for security-sensitive integrity or signature verification. For anything new, choose SHA-256 or SHA-512.
Why does my hash change when I add a space or newline?
Hashing is exact and byte-sensitive. A trailing space, an extra newline, or a change in letter case alters the input bytes, and even a one-character difference produces a completely different digest due to the avalanche effect. When comparing against a published checksum, make sure your input matches exactly, including invisible whitespace and line endings.
Related tools
Browse all free online tools in Generators and more.
Frequently asked questions
Is my text sent anywhere?+
No — hashes are computed locally using the browser's SubtleCrypto API.