Byte Counter
Free byte counter. Measure UTF-8 byte size of your text.
100% runs in your browser — no upload, no trackingHow to use
Type or paste text; the byte count updates live.
Example
héllo → 6 bytes (UTF-8)
FAQ
Is my data uploaded to a server?
No. Every tool runs entirely in your browser. Your input never leaves your device.
Is this tool free?
Yes, all DevToolbox tools are free to use with no account required.
Does it work on mobile?
Yes, the interface is mobile-friendly and responsive.
How accurate is the conversion?
We use standard, well-tested algorithms (Web Crypto, Intl, DOMParser). Results match common reference tools.