Free Online Base64 Text Encoder & Decoder
Encode and decode text in one click, with full UTF-8 support and instant processing. 100% in-browser, no data uploaded.
Key Features
Two-way Conversion
Convert plain text ⇄ Base64 in one click, with full UTF-8 support and no garbled Chinese.
Instant Processing
Encoding and decoding happen automatically as you type — no button clicks needed.
Fast on Large Text
Chunked conversion keeps things smooth even when you paste large blocks of text.
100% Local
All conversions run in your browser; your content never leaves the device.
How to Use
Choose Mode
Click Encode to turn text into Base64, or Decode to turn Base64 back into text.
Paste or Type
Paste your content into the input box — results appear on the right in real time.
Copy & Use
Click Copy to grab the result, ready for API testing or embedding resources.
Frequently Asked Questions
What is Base64 encoding used for?
It is commonly used to safely transfer binary or special-character data in URLs, JSON, and databases — ideal for text, configuration, and API parameters.
Will Chinese text get garbled?
No. The tool uses UTF-8 encoding, so Chinese text stays intact regardless of the system encoding.
Is my data uploaded to a server?
No. All encoding and decoding happens locally in your browser; your content never leaves the device.
How do I convert an image to Base64?
This tool focuses on text. For image ⇄ Base64 conversion, use the dedicated Image to Base64 tool on this site.