Developer ToolsEncoders & DecodersFree Tool
Base64 Decoder
Decode Base64 back to readable text using the browser-native atob() function, with full Unicode/UTF-8 support.
How to Use Base64 Decoder
- 1Paste your Base64 string
- 2Make sure the Decode tab is selected
- 3Click Process
- 4Copy the decoded text
Frequently Asked Questions
Your Base64 string is passed through the browser's native atob() function, then UTF-8 decoded — this ensures characters outside the basic ASCII range decode back correctly.
atob() throws an error for invalid Base64 (wrong characters or padding), which this tool catches and displays as an error message rather than crashing.
Yes — use the Encode/Decode tabs above the input to switch directions with the same tool.
No — decoding happens entirely in your browser; nothing is uploaded.
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