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Base64 conversion

Base64 Encoder Decoder

Encode text to Base64 or decode Base64 strings back to text.

Base64

Workspace

Convert text and Base64 both ways

Usage criteria

Base64 Converter: how to review the result

Review what the tool changes and how to check the output before using it elsewhere. Comparing your inputs with the destination requirements helps prevent an otherwise valid result from being rejected.

What the result means

Use it for API tests, token checks, or quick data conversion when you need a Base64 value.

Convert text and Base64 both ways

Recommended workflow

  1. 1Paste text or a Base64 value.
  2. 2Choose encode or decode.
  3. 3Convert and copy the result.

Checks before finishing

After processing, review UTF-8 text, Encode/decode, Copy result, Base64 encoder, Base64 decoder before using the result.

  • UTF-8 text
  • Encode/decode
  • Copy result
  • Base64 encoder
  • Base64 decoder

Processing method

Developer tools provide browser-based transformation and validation for quick checks. Re-test outputs before using them in production code or public links, and never paste passwords, API keys, or other secrets.

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

Core processing runs in the current browser whenever possible. OneClickTool does not store original files or tool inputs on its own server. Review the preview and output values before downloading or submitting an important result.

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.

  • Base64 encoder
  • Base64 decoder
  • Base64 converter

Related Guides

Check the criteria before using the tool to review results faster.

Developer Tasks
5 min read

Format and Validate JSON

Make JSON readable, find syntax errors, choose indentation, and minify only after validating the structure.

Text Tasks
5 min read

Characters and Bytes

Understand why character limits and UTF-8 byte limits differ for English, Korean, emoji, line breaks, and copied text.