Convert UTF8 to WTF8
Convert UTF8 data to WTF8 data. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Convert UTF8 to WTF8
- 1. Paste the UTF-8 text. Type or paste the text you want expressed as WTF-8, such as the single letter A, into the input pane.
- 2. Choose a Separator. Enter the character placed between each output byte, matching the format your internal string handling code or reference document expects for byte sequences.
- 3. Copy the WTF-8 hex bytes. The output pane shows the byte values, identical to standard UTF-8 for any valid input, since WTF-8 only differs when it needs to represent an unpaired surrogate.
When to use Convert UTF8 to WTF8
Convert UTF8 to WTF8 produces output under the WTF-8 convention used internally by some programming languages and libraries, such as Rust's OsString on Windows, to hold strings that may contain lone surrogate code units. For ordinary valid text it is byte-identical to standard UTF-8.
- Understanding Rust's internal string handling. You are reading Rust standard library internals that reference WTF-8 for representing OsString values on Windows and want a concrete example of how it relates to UTF-8.
- Documenting how a library handles invalid Unicode. You maintain a library that needs to round-trip filenames containing lone surrogates and want to document the WTF-8 representation it falls back to for such cases.
- Verifying byte-for-byte equivalence for valid input. You want to confirm to a teammate that WTF-8 and UTF-8 produce identical bytes for any normal string, and only diverge for the edge case of an unpaired surrogate.
Examples
Convert
Input
A
Output
41
About the Convert UTF8 to WTF8 tool
Convert UTF8 to WTF8 runs as plain JavaScript in your browser tab, with no server behind it. Convert UTF8 data to WTF8 data. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's UTF-8 Tools section, 69 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the Separator setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Convert UTF8 to WTF8 cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.