Base64 Converter (Privacy-First)
Encode or decode text instantly. No server calls — everything happens in your browser.
The Safe Way to Encode & Decode Base64 Online
This Base64 encoder and decoder tool allows you to safely process data. Most online Base64 tools send your data to a backend server to process it. This creates a massive security risk if you are decoding sensitive data like API Keys, JWT Tokens, or Basic Auth headers.
Toolshref Base64 is different. Our tool runs 100% in your browser using JavaScript’s native window.atob() and window.btoa() functions. Your data never leaves your device, making this the safest way to convert strings, binaries, and credentials online.
How to Use This Tool
- To Encode: Paste your plain text (e.g.,
admin:password) into the input box and click “Encode to Base64”. The tool will generate a standard ASCII string safe for HTTP headers. - To Decode: Paste a Base64 string (e.g.,
YWRtaW46cGFzc3dvcmQ=) and click “Decode to Text” to reveal the original content. - Copying: Click the “Copy Result” button to save the output to your clipboard instantly.
Common Developer Use Cases
Convert username:password combinations into Base64 for the Authorization: Basic HTTP header.
Decode the payload section of JSON Web Tokens (JWT) to inspect user claims without needing a secret key.
Debug MIME email contents where attachments are often encoded as Base64 blocks.
Encode binary data or complex strings to safely pass them as URL parameters.
Frequently Asked Questions
Is it safe to decode passwords here?
Yes, provided you trust your own device. Unlike other sites, Toolshref does not send your input to a cloud server. However, we always recommend avoiding pasting production secrets into any web page if possible.
Does this support Unicode / Emojis?
Yes. Standard Base64 functions fail with Unicode characters (like emojis or non-English text). Our tool includes a UTF-8 wrapper to ensure special characters are encoded correctly without throwing “Latin1” errors.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is designed to ensure data remains intact without modification during transport (e.g., via email or HTTP).