How to Use This Converter
Use this Base64 converter to quickly encode text for transport and decode Base64 payloads for debugging. Everything runs locally in your browser.
- 01
Select encode or decode
Switch modes based on whether your source is plain text or Base64 text.
- 02
Paste input
Paste your content into the input panel and output updates instantly.
- 03
Validate result
Check the output for expected text or Base64 format.
- 04
Copy output
Copy with one click for API requests, payloads, or docs.
Formula / Method
Encode mode converts UTF-8 bytes to Base64 using TextEncoder + btoa. Decode mode uses atob + TextDecoder to restore valid UTF-8 text.
Base64 Quick Reference
| Item | Symbol / Example | Description |
|---|---|---|
| Alphabet | A-Z a-z 0-9 + / | 64-character mapping |
| Padding | = | Used to align to 4-char blocks |
| hello | aGVsbG8= | Common test sample |
| Not encryption | N/A | Readable with simple decoding |
Frequently Asked Questions
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