Developer ToolsEncoders & DecodersFree Tool
Base64 Encoder
Encode any text into Base64 using the browser-native btoa() function, with full Unicode/UTF-8 support.
How to Use Base64 Encoder
- 1Paste your text
- 2Make sure the Encode tab is selected
- 3Click Process
- 4Copy the Base64 output
Frequently Asked Questions
Your text is first UTF-8 encoded, then passed through the browser's native btoa() function — this two-step process ensures non-ASCII characters (emoji, accented letters, non-Latin scripts) encode correctly, which plain btoa() alone can't handle.
Yes — use the Encode/Decode tabs above the input to switch. Decoding runs the exact reverse process (atob() then UTF-8 decode).
No hard limit is enforced by this tool, but very large inputs may be slow since btoa() processes the whole string synchronously in your browser.
No — encoding happens entirely in your browser using native JavaScript functions; nothing is uploaded.
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