Which hash algorithm should I use?

For security use SHA-256 or SHA-512. MD5 and SHA-1 are considered cryptographically weak and should only be used for checksums.

Is my text sent to a server?

No. All hash computation runs in your browser using the Web Crypto API. Your input never leaves your device.

Can I reverse a hash to the original text?

No. Cryptographic hash functions are one-way. It is computationally infeasible to reverse a hash to its original input.

Hash Generator — MD5, SHA-256, SHA-512 Online Free

Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes from any text instantly. Runs entirely in your browser — your input is never sent to a server. Free with no signup.

Hash Generator — MD5, SHA-256, SHA-512 Online Free

MD5128-bit. Fast, but not collision-resistant. Use only for checksums, not security.

SHA-1160-bit. Deprecated for security use. Still common in legacy systems.

SHA-256256-bit. Current standard for most security applications.

SHA-512512-bit. Higher security margin, slightly slower. Good for password hashing pipelines.

Hash Generator — MD5, SHA-256, SHA-512 Online Free

—Text is sent to the server only to compute hashes — it is not stored or logged.
—HMAC signs text with a secret key. Common uses: webhook verification, API request signing.
—Do not paste real production secrets into any online tool including this one.
—Hashes are one-way — you cannot reverse a hash back to the original text.

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