Base64 Encoder & Decoder Guide
Reference for encoding and decoding Base64 text, handling UTF-8, padding, Base64URL differences, and token debugging limits.
Quick answer
Use the Base64 Encoder & Decoder to encode UTF-8 text into Base64 or decode Base64 back into readable text.
What this tool does
The tool is useful for inspecting API samples, token fragments, encoded JSON snippets, and transport-safe text values. Base64 is encoding, not encryption.
Supported input
- Plain UTF-8 text for encoding
- Base64 text for decoding
- Common padding forms
- Copy-ready encoded or decoded output
Data handling and processing behavior
Processing is handled in the browser for this tool based on the current public implementation. Avoid entering sensitive credentials or tokens unless you have reviewed the implementation and your own data handling requirements.
Step-by-step use
- Choose encode or decode
- Paste the text value
- Review validation messages
- Copy the output
- Format decoded JSON separately when needed
Common errors
Treating Base64 as encryption. Encoded text can be decoded by anyone with the value.
Mixing Base64 and Base64URL. Token segments often use URL-safe characters and padding rules.
Ignoring UTF-8. Non-Latin characters need consistent character encoding.
Limits
The tool does not decrypt content, verify JWT signatures, or decide whether a token is trusted.
Next steps
- JWT Decoder — inspect token header and payload segments
- URL Encoder & Decoder — handle percent-encoded values
- JSON Formatter — format decoded JSON