Home / Tools / Base64 Encoder
Base64 Encoder
Encode and decode Base64 text (UTF-8)
Features
Encode / Decode
Convert text to Base64 or Base64 back to text with one click, switching modes anytime.
UTF-8 & Emoji Support
Based on UTF-8 byte encoding, Chinese, Japanese, emoji and other multi-byte characters round-trip losslessly.
Invalid Input Detection
Automatically detects invalid Base64 (illegal characters, wrong padding, bad length) with clear error messages.
Local Processing · Private
All encoding/decoding happens locally in your browser. Data is never uploaded, safe for sensitive text.
How to Use
Step 1: Choose a mode
Select "Encode → Base64" or "Decode → Text" in the toolbar, or click "Load Sample" to try it instantly.
Step 2: Enter content
Input text or a Base64 string (encoding supports Chinese and emoji; decoding validates the format automatically).
Step 3: Convert and copy
Click "Encode/Decode" for the result, then "Copy Result" to paste into your code or documents.
常见问题
Is the Base64 tool free?
Yes, completely free with no registration or usage limits.
Does it support Chinese and emoji?
Yes. Based on UTF-8 byte encoding, Chinese, Japanese, emoji and other multi-byte characters round-trip losslessly.
Will my data be uploaded to a server?
No. All encoding and decoding happens locally in your browser. Your data never leaves your device.
Is Base64 encryption?
No. Base64 is a reversible encoding, not encryption, and provides no security. Never use it to protect sensitive data — use real encryption instead.
仍有疑问？欢迎访问 AI Developer Toolbox 首页查看更多工具。
More Tools
Explore other free online developer tools