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Base64 Encoder & Decoder
100% In-Browser Execution
Source Plain Text109 chars
Base64 Result
Tool Documentation, Shortcuts & FAQs
How to Use Base64 Encoder & Decoder
- 1Select 'Encode' or 'Decode' mode.
- 2Paste or type your input in the source text area.
- 3Toggle 'URL-Safe' if you need Base64 for URL parameters.
- 4View the output updated in real-time, then click 'Copy' or 'Download'.
Key Capabilities
Full UTF-8 Unicode Support
Correctly encodes and decodes emojis, international characters, and multi-byte UTF-8 symbols without corruption.
URL-Safe Base64 Mode
Replaces standard '+' and '/' characters with '-' and '_' for safe use in URL query parameters and filenames.
Live Character & Byte Statistics
Displays original length, encoded byte size, and padding information in real time.
File Download & Copy
Instantly copy results to clipboard or download encoded payloads as files.
Frequently Asked Questions
Older tools rely on naive `btoa()` and `atob()` functions which only support Latin1. Our tool uses browser-native TextEncoder and TextDecoder APIs to properly support full multi-byte UTF-8 Unicode.
Zero Data Retention
All calculations are performed strictly in client-side memory using your browser engine. No data is ever sent across the network.