SHA-256 Hash Generator & Checksum Tool
Generate SHA-256, SHA-1, and MD5 hashes of text or files: verify downloads, compare checksums, fingerprint data. Computed locally, free.
A hash is a file's fingerprint: the same input always produces the same SHA-256 output, and any change — even one byte — changes the hash completely. This is how you verify a downloaded installer matches what the publisher published, or that a file copied to a USB drive survived intact.
Hash text or drop a file of any size; the digest is computed locally with the browser's crypto engine. No upload, no size limit, no waiting on a server.
100% in-browser · no upload · no signup · nothing you paste or drop here leaves your device
Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes. 100% local — no data uploaded.
All hashing runs locally via the Web Crypto API — your input never leaves the browser.
All hashing is performed locally in your browser — no input is uploaded. MD5 and SHA-1 are cryptographically broken and must not be used for security-sensitive purposes. Use SHA-256 or SHA-512 for any security application.
What a hash function does — illustrated
A hash converts any input size to a fixed-length digest. It is one-way (you cannot undo it), deterministic (same input → same output), and avalanche-sensitive (a one-bit change scrambles the whole result).
SHA-256 always returns 64 hex characters (256 bits), whether you hash one word or a whole disk image. Hashing 'Hello World!' with SHA-256 gives 7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069.
Paste Hello World! into the tool and click Compute Hashes to verify the SHA-256 output below.
- Input:Hello World!
- SHA-256:7f83b1657ff1fc53…200126d9069
- Length:64 hex chars / 256 bits
About this SHA-256 hash generator
This page covers file checksum verifier online, md5 sha1 sha256 compare, verify download integrity, hash text online free — all the same underlying task as SHA-256 hash generator. The tool above is FreeToolHub's hash gen embedded in full: every feature works right here, and nothing you process is uploaded to any server.
Frequently asked questions
How do I verify a downloaded file's checksum?
Generate the hash of your downloaded file here (or with certutil/PowerShell/sha256sum locally) and compare it character-by-character with the publisher's published checksum. A match confirms the file arrived unmodified; any mismatch means corruption or tampering — re-download or find another source.
Why prefer SHA-256 over MD5?
MD5 is cryptographically broken: attackers can craft different files with the same MD5 hash, so an MD5 match no longer proves integrity. SHA-256 has no known practical collisions. MD5 remains fine for non-adversarial deduplication, but for anything security-relevant — downloads, signatures, certificates — use SHA-256.