Developer
Text to Base64 Converter
- Browser-based
- No signup
This text to Base64 converter encodes strings for HTTP headers, JSON fields, and Basic auth examples. Paste UTF-8 text, get Base64 output, and copy into Postman, curl, or your application code.
Basic auth uses Base64 of `username:password`—still send over HTTPS only.
Large files should use dedicated file Base64 tools rather than pasting megabytes into a text area.
100% Client-Side
Your data never leaves your computer.
How to use this tool
Paste or type text, click encode, copy Base64 output. Use decode mode to reverse the operation.
Worked example
Example: encode `user:password` to Base64 for an HTTP Basic Authorization header example in documentation.
When to use this
- Generating Basic auth header values.
- Embedding small config blobs in env vars.
- Creating test fixtures for unit tests.
Common examples
- UTF-8 email header value → Base64 for debugging MIME parts.
- Small JSON claim → Base64 segment inspection before JWT assembly.
- Data URL prefix stripped → decode image bytes from `data:image/png;base64,...` payloads.
- Small SVG icon → data URL for inline HTML email test.
- UTF-8 string with emoji → Base64 for API fixture matching production encoding.
What people search for
- base64 encode decode
- base64 encoder online
- base64 decoder
- encode string base64
- base64 converter
Common mistakes
- Encoding credentials and committing them to git.
- Using standard Base64 where URL-safe variant is required.
- Double-encoding already encoded strings.
Related long-tail tasks
- base64 encode json string
- convert file to base64 online
- base64 decode to text utf8
How it works
Choose Encode or Decode, then paste or type text. Encoding converts UTF-8 text to standard Base64. Decoding accepts standard or URL-safe Base64 (with optional whitespace) and returns the original text. All processing runs in your browser.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Related Base64 Encoder & Decoder guides
These pages use the same base64 encoder & decoder with guides tailored to specific search intents.
Frequently asked questions
Unicode emoji support?
Yes for UTF-8 text. Encoded output represents the UTF-8 byte sequence.
Line breaks in output?
Some tools wrap long Base64 lines. Remove whitespace if your parser rejects wrapped strings.
Decode invalid Base64?
Invalid characters or padding show an error instead of garbage text.
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