Base64 Encode/Decode - Momo Toolbox
Base64 Encode/Decode
Encode and decode text and files
Base64 Encode/Decode Tutorial
Enter text in the input box to automatically encode or decode. Use the toggle button to switch direction. UTF-8 supported.
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Base64 Encode/Decode - Use Cases
The Base64 encoder/decoder is useful for handling Data URLs, email attachments, JWT tokens, API data transmission, and embedding images in HTML/CSS. Use it to convert binary data or special characters to ASCII-safe format, or to restore Base64 to its original content.
Features
- Bidirectional: encode and decode with one toggle
- UTF-8 safe: correctly handles Chinese, emoji, and other multi-byte characters
- Real-time output: converts as you type, no button clicks needed
- Error messages: invalid Base64 shows clear error messages
- One-click copy: results can be quickly copied to clipboard
FAQ
Is Base64 encryption? Is it secure?
No. Base64 is just an encoding scheme — anyone can decode it. It provides no encryption security. Do not use it to store passwords or sensitive data.
Why is Chinese text garbled after decoding?
Usually because the original encoding used a non-UTF-8 charset (like GBK). This tool uses UTF-8 by default — ensure the encoding step also uses UTF-8.
Does it support the Base64URL variant?
The current version only supports standard Base64 (with + / = characters). Base64URL (using - _) is not supported — use the JWT Decoder for tokens.
Want more details? See the full Base64 Encode/Decode Tutorial