UTF-16 Code Units Encode & Decode
View the UTF-16 code units (hex) of text and back. This tool does both encode and decode on one page — just pick a mode, paste your text, and click. Everything runs on your device, nothing is sent to a server.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
café
Example Output
0063 0061 0066 00e9
How to Use
- 1Choose Encode or Decode mode at the top.
- 2Type or paste your text into the Input field.
- 3Click the button (or press Ctrl+Enter) to process. The result appears in the Output field.
- 4Click Copy to copy the result, or "Swap input/output" to quickly reverse the operation.
About UTF-16 Code Units
The UTF-16 tool shows the UTF-16 code units of your text in hexadecimal (4 digits per unit), and can turn them back into text. UTF-16 is used internally by JavaScript and Windows.
How it works: each code unit (charCodeAt) is shown as 4 hex digits. Characters above the BMP use a surrogate pair, so they appear as two units.
Viewing UTF-16 code units is useful for understanding JavaScript string behavior, string lengths involving emoji, and interoperability with UTF-16-based systems.
FAQ
Can this UTF-16 Code Units tool both encode and decode?
Yes. This is a single page with a toggle — use Encode mode to transform text, and Decode mode to reverse it. No need for two separate pages.
Is my data sent to a server?
No. UTF-16 Code Units is processed entirely in your browser. The text you enter never leaves your device.