Find UTF8 Length
Calculate the length of UTF8 text, character-wise and byte-wise. 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 Find UTF8 Length
- 1. Paste your text. Drop any string into the input pane, from a single word to a full paragraph. The tool reads it as UTF-8 and starts measuring it the moment it arrives.
- 2. Read the three counts. The output lists code points, UTF-16 units and UTF-8 bytes separately. Code points match what a person calls a character, UTF-16 units matter for JavaScript's string length, and bytes matter for storage or wire size.
- 3. Use the number that fits your context. Pick the code point count for a character limit, the UTF-16 count if you are debugging a JavaScript string.length mismatch, or the byte count for a database column or network payload size.
When to use Find UTF8 Length
Find UTF8 Length answers a question that trips up a lot of code: how long is this string, really. A string with emoji or accented characters can have a different code point count, UTF-16 length and byte size, and each one matters in a different place.
- Debugging a JavaScript length mismatch. A string with an emoji reports string.length as 2 instead of 1 because JavaScript counts UTF-16 code units. Checking the code point count here confirms what a user would actually call one character.
- Sizing a database column. A VARCHAR column is defined by byte size in some encodings, not character count. Checking the UTF-8 byte length of sample names with accents or emoji tells you whether the column will actually fit them.
- Setting a form or tweet character limit. You are validating an input field that must stay under a fixed character count. Confirming the code point count for text containing multi-byte characters keeps the limit fair across all alphabets.
- Checking an API payload size. A request body has a byte size cap and the text field includes non-Latin characters. Measuring the UTF-8 byte length before sending tells you whether the payload will be rejected.
Examples
Emoji counts as one character but four bytes
Input
😀
Output
Code points: 1 UTF-16 units: 2 UTF-8 bytes: 4
About the Find UTF8 Length tool
Find UTF8 Length runs as plain JavaScript in your browser tab, with no server behind it. Calculate the length of UTF8 text, character-wise and byte-wise. 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.
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.
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
Is Find UTF8 Length 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.