Base64 Encoder/Decoder

Convert text to Base64 strings, or decode Base64 to text.

JavaScript is required for this interactive tool.Static Reference / Engine Logic:const text = input.value.trim(); try { // Try decoding first const decoded = atob(text); // If it successfully decodes to printable chars, show it if(/^[\x20-\x7E]*$/.test(decoded) && text !== btoa(text)) { output.textContent = "Decoded text:\n" + decoded; return; } } catch(e) { } // Otherwise, encode const encoded = btoa(unescape(encodeURIComponent(text))); output.textContent = "Encoded Base64:\n" + encoded;

How it works

This tool runs entirely in your browser using vanilla JavaScript. Data is not sent to any server. Mechanically, it processes the input string or array buffer using native web APIs (like WebCrypto, TextEncoder, or regex matching).

Common Use Cases

Debugging broken files.
Verifying data integrity.
Extracting raw data structures.

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