Base64 and URL encoding are essential for developers. This free tool runs entirely in your browser using built-in JavaScript (btoa, atob, encodeURIComponent, decodeURIComponent). No data is sent to any server. Use Base64 Encode to convert text or to embed small images as data URIs in CSS; use Base64 Decode to read encoded strings. Use URL Encode to safely encode special characters in query strings or paths; use URL Decode to decode complex or encoded URLs.

Select the mode (Base64 Encode/Decode or URL Encode/Decode), paste or type your input, and click Convert. Copy the result with one click. The tool handles Unicode text correctly for Base64 via UTF-8 encoding. It is fast, lightweight, and works offline once the page is loaded.

Developers often need to encode or decode strings when building APIs, debugging, or working with data URIs. This tool provides a quick, private way to do it without leaving your browser or installing anything. Free and no sign-up required.