What does UTF-8 Byte Counter do?

UTF-8 Byte Counter is a free online tool from MarkVibe that lets you count UTF-8 byte length. No sign-up, no install — open the page and use it.

Is UTF-8 Byte Counter free?

Yes, UTF-8 Byte Counter is 100% free with no credit card, no daily limit, and no watermark. Use it as often as you like.

Does UTF-8 Byte Counter send my data to a server?

No. UTF-8 Byte Counter runs entirely in your browser using client-side JavaScript, so your input stays on your device.

Does UTF-8 Byte Counter work on mobile?

Yes. UTF-8 Byte Counter is fully responsive and works on any modern browser — Chrome, Firefox, Safari, Edge on phones, tablets, and desktops.

Where can I find more developer tools?

MarkVibe ships 280+ free utilities including a full suite of developer tools. Scroll to the Related tools section below to discover more in this category.

UTF-8 Byte Counter — Free Online Tool

What is the UTF-8 Byte Counter?

The UTF-8 Byte Counter is a free online developer tools from Markvibe. Count exact UTF-8 byte length of text. It runs entirely in your browser — your data never gets uploaded — and works on desktop, tablet and mobile with no sign-up.

Reviewed by The Markvibe Team · Last updated 2026-06-28

Example

A worked example so you know exactly what to expect.

Input

(your input goes here)

Output

(the UTF-8 Byte Counter runs in your browser and shows the result instantly)

How to use UTF-8 Byte Counter

1Open the UTF-8 Byte Counter above on MarkVibe — it loads instantly with no sign-up.
2Enter or paste your input into the UTF-8 Byte Counter field.
3Adjust any options to control exactly how UTF-8 Byte Counter produces the result.
4UTF-8 Byte Counter runs locally in your browser and shows the result immediately.
5Copy the output to your clipboard or save it, then share the UTF-8 Byte Counter link with anyone.