Byte Counter — String Size Calculator
Count bytes, characters, and code points in any text. Shows UTF-8, UTF-16, and ASCII sizes. Free online tool.
UTF-8 Byte Breakdown
Why Count Bytes?
String length in characters is not the same as byte size. A single emoji like 🌍 is 1 character but 4 bytes in UTF-8. Knowing byte size is essential for database column limits, API payload sizes, HTTP headers, and file storage.
UTF-8 vs UTF-16
UTF-8 uses 1-4 bytes per character and is the web standard. UTF-16 (used by JavaScript and Windows) uses 2 or 4 bytes per character. ASCII characters always take 1 byte in UTF-8 and 2 bytes in UTF-16.
About This Tool
The Byte Counter is a free online tool available on CodeUtilo. Count bytes, characters, and code points. Shows UTF-8 and UTF-16 sizes. All processing happens directly in your browser — no data is ever sent to any server, ensuring your privacy and security. No signup or installation is required.
Key Features
- Browser-Based Processing — All byte counter operations run locally in your browser using JavaScript. Your data never leaves your device.
- Instant Results — Get results immediately as you type or paste your input. No waiting for server responses or page reloads.
- Free & No Signup — Use the byte counter as many times as you need without creating an account or paying anything.
- Mobile Friendly — Works on desktop, tablet, and mobile browsers. Access this tool from any device with an internet connection.
Common Use Cases
- Using the byte counter for day-to-day development tasks
- Saving time on repetitive tasks by using a browser-based tool instead of writing custom code
- Working on projects where installing software is not an option (school, work, shared computers)
- Quick prototyping and debugging without switching to a terminal or IDE
- Sharing the tool link with colleagues who need the same functionality
How to Use
Enter your input in the text area provided and the byte counter will process it instantly. Use the Copy button to copy the result to your clipboard. All operations are performed locally in your browser — no data is transmitted to any server.
Frequently Asked Questions
Is the Byte Counter free to use?
Yes, the Byte Counter is completely free with no usage limits. There is no signup or registration required. You can use it as many times as you need.
Is my data safe when using this tool?
Yes. All processing happens locally in your browser using JavaScript. Your data is never uploaded to any server or stored anywhere. Everything stays on your device.
Does this tool work on mobile devices?
Yes. The Byte Counter is fully responsive and works on smartphones, tablets, and desktop computers. You can use it from any modern browser on any device.
Do I need to install anything?
No. The Byte Counter runs entirely in your web browser. There is nothing to download or install. Just open the page and start using it immediately.
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Before This Tool