UUID v4 Generator
Developer Local only
SHA Hash Generator
Local onlyCalculate SHA-256, SHA-384, or SHA-512 for text and local files.
Ready
Web Crypto API Calculated locally on this device
Text
Hash text using the browser's Web Crypto API.
0 characters 0 UTF-8 bytes
Hash
A hexadecimal digest ready to copy and compare.
Your digest will appear here
Add text or choose a file, then calculate its secure hash.
How to use it
- 01
Choose text or file
Files remain local and are read directly by your browser.
- 02
Select an algorithm
Choose SHA-256, SHA-384, or SHA-512 from the Web Crypto API.
- 03
Calculate the digest
Copy the hexadecimal value to compare or store it.
Frequently asked questions
Is the selected file uploaded?
No. The browser reads it into local memory and calculates the digest on your device.
Why is there a file size limit?
Web Crypto digests require the complete file in memory. Nobuf limits files to 100 MB to avoid exhausting browser memory.
Related tools
Keep working with other private browser utilities.