SHA-256 Hash Generator
This free online SHA-256 hash generator computes the digest of any text using the Web Crypto API built into your own browser — the same FIPS 180-4 algorithm your operating system and every package manager rely on, with no server in the loop.
How to use
- Type or paste the text to hash into the editor below.
- The 64-character SHA-256 digest appears instantly as lowercase hex.
- Toggle uppercase output if your target system expects it; copy or download the digest.
Frequently asked questions
How is my text encoded before hashing?
As UTF-8, the universal default in modern tooling — command-line sha256sum, most programming language standard libraries and package registries all hash the UTF-8 bytes. Non-ASCII content (Chinese, emoji, accented letters) therefore produces the same digest you would get locally.
Is the SHA-256 output really computed in my browser?
Yes. The digest is computed by the Web Crypto API of your own browser on your device. There is no server round trip, so the result is available offline once the page has loaded and nothing you hash is transmitted.
Why does the tool only produce lowercase hex, or uppercase?
Lowercase hex is the common default. If the system you are comparing against prints uppercase digests, switch on uppercase output — the underlying bytes are identical, only the letter case differs.
Can I reverse a SHA-256 hash back to text?
No. SHA-256 is a one-way function: the digest cannot be decrypted. Anyone claiming to "decrypt" a hash is brute-forcing guesses. Use this tool to verify that two pieces of text match, not to recover lost content.
Is SHA-256 still safe to use?
For integrity checking, fingerprints and general verification, yes — it remains a current standard with no practical collision attacks. For password storage specifically, use a dedicated slow scheme such as Argon2 or bcrypt instead of a bare SHA-256.
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About this tool
This free online SHA-256 hash generator computes the digest of any text using the Web Crypto API built into your own browser — the same FIPS 180-4 algorithm your operating system and every package manager rely on, with no server in the loop. Paste or type the text and the 64-character hexadecimal digest appears instantly, recomputed live as you edit, so verifying that a config snippet, a license key or a piece of generated data matches an expected hash takes one glance. The input is encoded as UTF-8 before hashing, which is the convention used by virtually all modern tooling; the output is lowercase hex by default with an uppercase switch for systems that prefer it, and the digest can be copied from the preview or downloaded as a text file. Because the computation runs on your device, whatever you hash — passwords you are documenting for a team vault, API secrets, private keys fingerprints, contract text — never touches a network. Note the boundary honestly: this tool hashes text for verification and comparison; it is not a password "encryptor" and cannot recover anything from a hash.