SHA-256 / SHA-512 fingerprint calculator
Compute the SHA-256, SHA-512 or SHA-1 fingerprint of a text or a file, to verify a download is intact or to compare two contents. A single changed byte flips the whole 64-character SHA-256 string, which is what makes a fingerprint trustworthy. The file is read on your device and nothing is uploaded, so a document you are fingerprinting never leaves your machine.
- 100% local
- Free · no account
- Instant result
This tool runs entirely in your browser — nothing is sent to a server.
A hash function transforms any data into a fixed-size fingerprint: changing the slightest bit changes the fingerprint completely. SHA-256 (64 hexadecimal characters) is the current standard for verifying the integrity of a downloaded file or comparing contents.
This tool computes the SHA-256, SHA-512 or SHA-1 fingerprint of a text (live) or a file, entirely in your browser via the WebCrypto API — the file is never sent to a server.
How it works
Type the figures or drop the file you want to process — the tool checks them as you go.
Everything is computed directly in your browser. Nothing is sent to a server.
The result appears instantly, with the detailed breakdown ready to copy, download or keep.
Why use this tool
No account, no download, no limit: the result appears as soon as you enter your data.
Every rule, algorithm and check reflects what we use ourselves every day at Flexina.
The calculations follow the official standards, and the step-by-step detail lets you double-check the outcome.
What does running it locally bring you?
Files, figures and documents never leave your device: nothing is stored, nothing is sent.
Once the page is loaded, you can cut the network: the tool keeps working.
No upload, no account, no third-party server in between: results stay fast and fully private.
Frequently asked questions
How do I verify a download?
The publisher’s site publishes the expected fingerprint (often SHA-256). Compute the one of your downloaded file here and compare: if they differ, the file is corrupt or tampered with.
Why avoid SHA-1 and MD5?
Collisions (two different contents, same fingerprint) are achievable with MD5 and SHA-1: they are no longer suitable for security use. SHA-256 remains safe.
Can a hash reveal the original content?
No, hashing is one-way. But for predictable inputs (common passwords), precomputed tables exist — which is why passwords are hashed with dedicated algorithms (bcrypt, Argon2), not plain SHA.