Base64 Encoder
Encode text to Base64 online. Supports full Unicode text, not just plain ASCII.
Your text is encoded entirely in your browser. Nothing is sent to a server.
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How to use this tool
- 1Type or paste the text you want to encode.
- 2The Base64 result appears automatically below as you type.
- 3Copy the result or download it as a .txt file.
Features
- Encodes as you type — no button to click.
- Full Unicode support (accents, CJK characters, emoji), not just plain ASCII.
- Copy result to clipboard, or download as a .txt file.
- No account or sign-up required.
Privacy
Your text is encoded entirely in your browser. It is never sent to a server, logged or stored.
Frequently asked questions
Is this Base64 encoder free?
Yes. You can encode unlimited text for free, with no sign-up required.
What is Base64 encoding used for?
Base64 turns arbitrary text or binary data into a string of printable characters. It is commonly used to embed data in URLs, JSON, emails and data: URIs.
Does it support non-English text?
Yes. Unlike the raw browser btoa() function, this tool correctly handles full Unicode text — accented letters, Chinese/Japanese/Korean characters and emoji — not just plain ASCII.
Is my text sent to a server?
No. Encoding happens locally in your browser using native JavaScript APIs.
Guides
- What Is Base64 Encoding and When Should You Use It?
Base64 turns binary data into plain text so it can travel safely through systems built for text. Here's how it works and when you actually need it.
- Base64 vs Base64URL: Fix Invalid Characters and Missing Padding
Learn why Base64 decoding fails, how Base64URL changes the alphabet, and when to restore padding, with safe JavaScript examples.
- What's Inside a JWT? How to Decode One Safely
A JWT looks like gibberish, but it's just Base64-encoded JSON. Here's what's actually inside a JSON Web Token and how to inspect one safely.
- What Is URL Encoding and Why Does It Matter?
Spaces and special characters can break a URL. URL encoding (percent-encoding) is what fixes that — here's how it works and when to use it.