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.

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

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Common mistakes

Encoding credentials and committing them to git.
Using standard Base64 where URL-safe variant is required.
Double-encoding already encoded strings.

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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 on your device.

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 stays on your device and is not uploaded.

Related Base64 Encoder & Decoder guides

These pages use the same base64 encoder & decoder with guides tailored to specific search intents.

Base64 Encoder & Decoder — general payment estimate
Base64 Decoder Online
Image to Base64 Converter
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Base64 Encode and Decode Online
Base64 Encode Decode Tool
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FAQ

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.

Page last reviewed: July 6, 2026

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