Validate Unicode
Check if the given Unicode has valid encoding. 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 Validate Unicode
- 1. Paste the text to check. Enter the Unicode text you want validated into the input pane. This is especially useful for text reconstructed from raw bytes, code units or a manual escape process.
- 2. Review the validation result. The tool scans for encoding problems such as lone surrogate halves that never paired into a valid UTF-16 sequence, reporting whether the text is well-formed or exactly where it breaks.
- 3. Copy the report. Copy the validation message from the output pane, whether it confirms the text is clean or flags the specific issue found, for a bug report or a data quality check.
When to use Validate Unicode
Validate Unicode checks whether text is well-formed, flagging problems like lone surrogate halves that indicate broken UTF-16 encoding. Use it whenever text arrived through a process that might have mangled multi-code-unit characters, such as manual byte manipulation or a faulty split.
- Debugging a string that crashes a JSON serializer. A backend throws an encoding error when serializing a user-submitted string, and the cause is unclear. Validating the string reveals an unpaired surrogate left over from a bad substring operation.
- Checking output from a custom text-splitting function. You wrote code that slices strings by a fixed length and worry it might cut a surrogate pair in half. Validating the sliced pieces confirms whether any of them ended up malformed.
- Verifying data recovered from a corrupted file. A text file was recovered after a partial write or transfer error and some characters look suspicious. Validating the recovered text confirms whether the encoding is intact or damaged.
- Confirming a database migration preserved text encoding. You migrated string data between two systems with different encoding assumptions and want to check nothing broke along the way. Validating a sample of migrated rows catches any surrogate corruption early.
Examples
Valid
Input
Hello 🌍
Output
Valid: no encoding issues found.
About the Validate Unicode tool
Validate Unicode does its work locally, right in the browser. Check if the given Unicode has valid encoding. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Unicode Tools collection on EditSafely, a set of 98 small, focused Unicode utilities that share the same instant, private workspace.
There is nothing to configure. Provide the input and the result appears on its own. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Validate Unicode free to use?
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?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
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?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
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.