String Byte Size Counter
Measure UTF-8 and UTF-16 byte size of any string.
Reach for String Byte Size Counter when you're debugging data transport, building a test fixture or just learning how text is encoded. It converts both ways, is fully UTF-8 safe, and runs free and private in your browser.
About String Byte Size Counter
String Byte Size Counter measure UTF-8 and UTF-16 byte size of any string instantly, in both directions, right in your browser. It's the quick, UTF-8-safe utility developers reach for when debugging data transport, building test fixtures or learning how text is represented under the hood. Like every ToolJolt utility it runs 100% in your browser β no sign-up, no upload, and nothing ever sent to a server, so it's safe for proprietary code and confidential data.
How to use String Byte Size Counter
- 1Paste or type your input.
- 2Pick the direction (encode or decode) if applicable.
- 3The converted value appears instantly.
- 4Copy it wherever you need it.
Why use String Byte Size Counter?
- βConverts both directions instantly
- βFully UTF-8 aware β emoji and accents round-trip
- βCopy the result with one click
- βHandy for debugging, transport and learning
Frequently asked questions
Does String Byte Size Counter handle Unicode correctly?+
Yes. String Byte Size Counter is UTF-8 aware, so multi-byte characters such as emoji, accents and non-Latin scripts encode and decode without corruption.
Is encoding the same as encryption?+
No. Encoding only changes how data is represented so it can travel safely through text systems β anyone can reverse it. It provides no secrecy; use an encryption tool when you need confidentiality.
Is String Byte Size Counter free?+
Yes. String Byte Size Counter is completely free with no sign-up, no account, no usage limits and no watermarks. Use it as often as you like.
Does String Byte Size Counter send my data to a server?+
No. String Byte Size Counter runs entirely in your browser with JavaScript β your input never leaves your device, which makes it safe for private API payloads, schemas and source code.
Embed String Byte Size Counter on your website
Want String Byte Size Counteron your own site? Paste this snippet into any HTML page β it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/string-byte-counter" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="String Byte Size Counter β ToolJolt" loading="lazy"></iframe>