Base64 Encoder & Decoder
Base64 is an encoding scheme used to represent binary data in an ASCII string format. It's often used for Image DataURLs, Tokens, or URL-safe data transfer. This tool supports **UTF-8**.
Client-side Processing
Fast & Efficient
Developer Tool
Input Length: **0** chars
How to use Base64 Converter?
- 1Paste your text or Base64 string into the input area.
- 2Click 'Encode' to generate Base64, or 'Decode' to revert to plain text.
- 3The result will be instantly displayed in the card below.
- 4Use 'Copy' to save the result or 'Swap' for further conversion.
Base64 FAQs
Is Base64 a form of encryption?
No. Base64 is an encoding scheme, not encryption. It's used to represent binary data in an ASCII string format and can be easily reversed by anyone.
Is my data privacy protected?
Yes. All conversions happen locally in your browser. No data is ever uploaded to our servers.
Base64 Common Scenarios
- Data URI usage: Embed small assets directly into CSS/HTML to reduce round-trip requests.
- Protocol-safe Transfer: Send binary data over text-only protocols without corruption.
- API Authentication: Generate 'Basic Auth' headers for development and testing.
- Payload Debugging: Decode and inspect JSON Web Tokens (JWT) or complex network payloads.
Technical Deep Dive: How Base64 Works
Base64 represents binary data using printable ASCII characters. This tool uses TextEncoder and TextDecoder for UTF-8 text, then applies the browser's btoa or atob functions to encoded bytes. Processing runs locally in the browser; very large inputs may still be limited by available memory.
Verified Test Vectors
Use these known results to verify UTF-8 text handling. Base64 is reversible encoding—not encryption—and provides no integrity protection.
| Input | Base64 | Notes |
|---|---|---|
| hello | aGVsbG8= | UTF-8 / ASCII |
| 你好 | 5L2g5aW9 | UTF-8 |
| ✓ | 4pyT | U+2713 |