Hash Generator
Generate a SHA-256 cryptographic hash from any text, computed locally.
How it works
Hashing turns any input into a fixed-length string of characters, and the same input always produces the same hash -- but you can't reverse a hash back to the original text. That one-way property is what makes hashing useful: verifying file integrity (comparing a downloaded file's hash against a published one), storing password verification data without storing the password itself, or generating a consistent short identifier for a piece of content.
This tool computes SHA-256, the most widely used general-purpose hash function today, using a pure JavaScript implementation that runs entirely in your browser -- your input text is never sent to a server, which matters if you're hashing anything sensitive.
Paste any text and get the 64-character hexadecimal SHA-256 digest instantly, ready to copy and compare or store.
Frequently asked questions
Can I reverse a hash back to the original text?
No. SHA-256 is a one-way function; hashes cannot be reversed, only compared against known values.
Why does the same text always give the same hash?
SHA-256 is deterministic -- identical input always produces identical output, which is exactly what makes hashes useful for verifying that two pieces of data match without comparing them directly.
Is SHA-256 still considered secure?
Yes, SHA-256 has no known practical collision attacks and remains the standard choice for most integrity-checking and cryptographic applications as of today.
Can I hash a whole file, not just text?
This tool accepts text input only. For files, you'd typically use a command-line tool (like sha256sum) or a dedicated file-hashing utility.