Validate UTF8
Check UTF8 encoding for errors and report them. 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 UTF8
- 1. Paste the text or bytes to check. Enter the string you want to verify, such as Héllo. The tool inspects the underlying byte sequence against the UTF-8 encoding rules.
- 2. Read the validation result. The output states whether the input is valid UTF-8. Plain readable text like Héllo reports Valid UTF-8, while malformed byte sequences are flagged with the reason they fail.
- 3. Act on the result. Use a passing result to confirm text is safe to store or transmit as UTF-8, or use a failing result to identify that the source data needs re-encoding or repair.
When to use Validate UTF8
Validate UTF8 checks whether a string's byte sequence conforms to the UTF-8 encoding rules and reports any errors it finds. It is a quick sanity check for data that is supposed to be UTF-8 but whose actual encoding you are not certain of.
- Diagnosing a mojibake report. A user reports garbled characters appearing in an exported file or email, and you suspect the data was mislabeled as UTF-8 when it is actually a different encoding entirely.
- Validating data before a database import. A CSV or JSON import job is about to load text into a column that requires strict UTF-8, and you want to confirm the source file will not trigger encoding errors partway through.
- Checking output from a legacy system. An older application exports text that is supposed to be UTF-8 but was historically inconsistent, and you want to confirm today's export is actually well-formed before piping it downstream.
Examples
Plain text is always valid UTF-8
Input
Héllo
Output
Valid UTF-8.
A lone continuation byte is invalid
Input
0x80
Output
Invalid UTF-8.
About the Validate UTF8 tool
Validate UTF8 does its work locally, right in the browser. Check UTF8 encoding for errors and report them. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the UTF-8 Tools collection on EditSafely, a set of 69 small, focused UTF-8 utilities that share the same instant, private workspace.
There is nothing to configure. Provide the input and the result appears on its own. 2 worked examples further down the page show exactly what the tool produces for real inputs.
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 UTF8 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.