Base64 conversion
Base64 Encoder Decoder
Encode text to Base64 or decode Base64 strings back to text.
Your input is not stored on our server
How to use Base64 Converter
Use it for API tests, token checks, or quick data conversion when you need a Base64 value.
Recommended workflow
- 1.Paste text or a Base64 value.
- 2.Choose encode or decode.
- 3.Convert and copy the result.
Base64 Converter output checks
- Do not include passwords, API keys, or other secrets.
- Run or validate the output in a test environment.
- Confirm the encoding and formatting options match the destination.
Processing method
Text is converted to UTF-8 bytes before Base64 encoding, and decoding first checks whether the input is valid Base64.
How files and inputs are handled
This tool processes files and inputs in the current browser. OneClickTool does not receive or store the original content on its own server.
Frequently Asked Questions
Can I encode Korean or emoji?
Yes. Text is handled as UTF-8, so Korean, emoji, and symbols can be converted.
When does decoding fail?
If the input is not valid Base64 or has broken characters, the tool shows an error instead of copying a bad result.
Does this convert files to Base64?
This version focuses on text Base64 conversion. File conversion is better as a separate tool.
Supported Scope
Code formatting, JSON validation, Base64, URL encoding, and UTM URL building are supported.
External API calls, server log analysis, and security scanning are not currently supported.
Related Guides
Check the criteria before using the tool to review results faster.
Developer TasksFormat and Validate JSON
Make JSON readable, find syntax errors, choose indentation, and minify only after validating the structure.
Text TasksCharacters and Bytes
Understand why character limits and UTF-8 byte limits differ for English, Korean, emoji, line breaks, and copied text.