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Instant Result
Base64 Decoder
Decode Base64 encoded strings back into readable UTF-8 text with auto error detection.
Initializing Base64 Decoder...
How to Use the Base64 Decoder
1. Paste your Base64 encoded string.
2. The tool automatically decodes the payload.
3. View and copy decoded plain text.
2. The tool automatically decodes the payload.
3. View and copy decoded plain text.
Algorithm & Formula Details
UTF-8 byte reconstruction from 6-bit Base64 index table.
All mathematical calculations, text transformations, and cryptographic hashes are executed strictly in memory inside your browser using modern Web APIs.
Frequently Asked Questions
Our decoder uses full UTF-8 decoding to properly render emojis and international characters.