Base64 Encoder / Decoder
Encode and decode text and data to/from Base64
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⚙️ How It Works
Paste your raw string into the text area to immediately view the Base64-encoded string. Switch to 'Decode' mode to unwrap encoded Base64 back into readable text. Select 'URL-safe' mode to strip special symbols and output web-friendly strings.
❓ Frequently Asked Questions
What is Base64 encoding?
Base64 is a widespread binary-to-text encoding scheme that represents binary data using 64 ASCII characters (A-Z, a-z, 0-9, +, /). It's primarily used for safely encoding data in URLs, sending email attachments, and embedding data URIs in CSS and HTML.
What is URL-safe Base64?
URL-safe Base64 replaces the plus `+` and slash `/` characters with a minus `-` and underscore `_`, and commonly removes the trailing `=` padding. This adaptation guarantees the encoded string is safe to use directly inside URL routes or query parameters without requiring further percent-encoding.
Is this Base64 tool safe to use with sensitive data?
Yes. All Base64 encoding and decoding operations happen locally inside your browser using JavaScript. Absolutely no text or data is transmitted to or stored on external servers.
Does the Base64 Encoder / Decoder work offline?
Yes, the Base64 Encoder / Decoder is fully functional offline. Because this tool runs entirely in your browser, no data is ever uploaded to external servers. Once the page is loaded, you can seamlessly continue using it without an active internet connection. You can also install Knicknaks as a Progressive Web App (PWA) for native-like offline access.