Free SHA Hash Generator

How this tool computes its result

Uses the browser's native window.crypto.subtle.digest() (Web Crypto API) to hash UTF-8 encoded input text with a selectable algorithm — SHA-1, SHA-256, SHA-384, or SHA-512 — then renders the resulting digest bytes both as a lowercase hex string and as base64. The digest recomputes automatically via a useEffect any time the input text or selected algorithm changes, and the component checks window.crypto?.subtle up front to detect whether the API is even available in the current browsing context.

Worked example

Typing 'hello' with SHA-256 selected produces the hex digest 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824 (the well-known SHA-256 digest of the string 'hello') alongside its base64 equivalent, computed by the same digest bytes run through the tool's own toBase64() helper.

When not to use this tool

This hashes raw text typed into a browser textarea — it has no file input, so it cannot be used to verify a downloaded file's checksum, which is one of the most common reasons someone reaches for a 'hash generator' in the first place.

Common mistakes

• - Looking for MD5 as an algorithm option — only SHA-1/256/384/512 are exposed because that's exactly what SubtleCrypto.digest() supports natively; MD5 isn't implemented by the Web Crypto API at all.
• - Embedding this tool in a restricted context (a non-HTTPS page or a sandboxed iframe without crypto access) — it detects the missing window.crypto.subtle up front and shows 'Web Crypto API is not available in this browser context' instead of failing silently or throwing an unhandled error.
• - Assuming trailing whitespace or newlines get trimmed before hashing — the raw textarea value, including any trailing newline, is hashed exactly as typed, so two visually identical inputs with different invisible whitespace produce different digests.

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