How to Encode or Decode Base64
Base64 is a way of representing binary or text data using only 64 printable characters (A-Z, a-z, 0-9, +, /), commonly used for embedding data in URLs, JSON, emails, and configuration files. This tool converts plain text to Base64 or decodes Base64 back to readable text, entirely in your browser.
Steps
- Choose Encode to turn text into Base64, or Decode to turn Base64 back into text.
- Paste your input into the box.
- Click the convert button and copy the result.
Worked example: Encoding Hello, World! produces SGVsbG8sIFdvcmxkIQ==. Decoding that same string back gives you the original Hello, World! text exactly.
Common Uses
Developers encode API keys or small payloads for embedding in config files or URLs. Anyone troubleshooting an email or API response that shows a Base64-encoded string can decode it back to plain text to see what it actually says. Base64 is not encryption — it is just a text-safe encoding — so it shouldn't be used to protect sensitive data, but it is useful for compatibility across systems that only accept plain text.
Base64 vs. Encryption
| Base64 | Encryption | |
|---|---|---|
| Purpose | Format conversion for compatibility | Confidentiality and security |
| Reversible without a key? | Yes, by anyone | No, requires the correct key |
| Protects sensitive data? | No | Yes, when implemented correctly |
Frequently Asked Questions
Is Base64 the same as encryption?
No, Base64 is just an encoding format, not encryption. It provides no security or confidentiality.
Why does decoding sometimes show an error?
This happens if the input isn't valid Base64 — check for missing characters or extra spaces.
Can I encode special characters and emojis?
Yes, the tool handles full Unicode text correctly during both encoding and decoding.
Is my data uploaded anywhere?
No, encoding and decoding happen entirely in your browser.
Why is there padding with = signs at the end?
Base64 processes data in 3-byte chunks; when the input length isn't a multiple of 3, one or two = characters are added as padding to complete the final group.