Which SHA algorithm should I use?

SHA-256 is the modern default — used by TLS, Bitcoin and JWT signatures. Use SHA-512 for large data on 64-bit systems (slightly faster). Avoid SHA-1 for anything security-critical.

Can I use SHA to store user passwords?

No — plain SHA is far too fast to be safe for passwords. Use bcrypt, scrypt or argon2 instead. SHA is fine for integrity checks and HMAC.

Is my text sent to a server?

No — all hashing runs in your browser via the built-in Web Crypto API.

SHA-1 / SHA-256 / SHA-512 Hash Generator

Free Online Tool

SHA Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text — all four at once. 100% client-side using the Web Crypto API.

Your text

SHA-1 · 40 hex

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SHA-256 · 64 hex · most common

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SHA-384 · 96 hex

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SHA-512 · 128 hex

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Which SHA should I use?

SHA-256 — industry default. Used by Bitcoin, TLS, JWT signatures.
SHA-512 — same security level as SHA-256 but faster on 64-bit systems for large data.
SHA-1 — deprecated for security (broken by chosen-prefix attacks). Still useful for integrity checks / non-security purposes.
Never use plain SHA for storing passwords — use bcrypt/argon2 (SHA is too fast, easy to brute-force).

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