UTF-8 Converter

How to use UTF-8 Converter

1. Open UTF-8 Converter — it runs entirely in your browser with no setup.
2. Paste or type your input into the text area, or upload a file where supported.
3. Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server.
4. Review the output instantly; large inputs are handled locally without lag.
5. Copy the result to your clipboard or download it. Your data never leaves the page.

Why use UTF-8 Converter?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full developer tools suite, so related utf-8 tasks are one click away.

What people use UTF-8 Converter for

• Inspecting the exact bytes a string produces before writing it to a file or socket.
• Debugging mojibake, where text has been decoded with the wrong encoding.
• Working out why a string's byte length differs from its character length.

UTF-8 Converter: limits and things worth knowing

• UTF-8 uses one to four bytes per character. ASCII is one byte, most Latin accents and Greek and Cyrillic are two, most CJK is three, and emoji are four — which is why a 10-character string can be 40 bytes.
• Database column limits are usually in bytes, not characters. This is why MySQL's utf8mb4 needs four bytes per character and why an emoji can overflow a column that looked large enough.
• The UTF-8 BOM (EF BB BF) is legal but discouraged. It is a frequent cause of an unexpected character at the start of a parsed file.
• Mojibake almost always means UTF-8 bytes were decoded as Latin-1: the giveaway is the à sequence appearing before accented letters.

Sources

• The Unicode Standard

Is it private and secure?

Your privacy is built in. UTF-8 Converter runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Is It Safe to Paste Production Data Into Online Tools? — JWTs, API responses and env files get pasted into online formatters every day. Here's what actually happens to that data and how to check before you paste.