SHA-256 Hash Generator
Computed in your browser — your text is never sent to a server.
What is SHA-256 Hash Generator
SHA-256 (Secure Hash Algorithm 256-bit) is part of the SHA-2 family, published by NIST in 2001. It converts any input into a fixed 64-character hexadecimal string (256 bits). SHA-256 is the most widely deployed cryptographic hash function today: it secures Bitcoin transactions, TLS/SSL certificates, code signing, and file integrity checks. No practical collision attacks against SHA-256 have been demonstrated. This tool computes SHA-256 hashes entirely in your browser using the native Web Crypto API.
How to use
- Type or paste any text into the input field.
- The SHA-256 hash updates instantly as you type.
- Click Copy to copy the 64-character hash to your clipboard.
- To switch to another algorithm, choose MD5, SHA-1, or SHA-512 from the Algorithm dropdown — your input is preserved.
When to use it
Need to confirm a download wasn't tampered with before you ship it to production? Paste the file's contents (or its checksum text) and compare the 64-character SHA-256 against the value on the vendor's official release page. A perfect match tells you the binary is exactly what they published, byte for byte.
Frequently asked questions
Is SHA-256 secure?
Yes. SHA-256 is currently considered cryptographically secure. No practical collision or preimage attacks have been demonstrated against SHA-256 to date.
How long is a SHA-256 hash?
SHA-256 produces a 256-bit value displayed as 64 hexadecimal characters, regardless of the input size.
Why does Bitcoin use SHA-256?
Bitcoin uses SHA-256 in its proof-of-work mining algorithm and for hashing block headers. It was chosen for its security, well-studied properties, and consistent performance.
Is my text sent to a server?
No. SHA-256 is computed in your browser using the Web Crypto API. Your input never leaves your device.
Can I share this tool with my inputs pre-filled?
Yes. The URL updates automatically as you type. Copy it from the address bar or use the Share button — anyone who opens the link will see your exact inputs ready to go.
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