URL Encode / Decode

This tool is designed for cases where you need to encode a value that will be used as part of a URL rather than rewriting a full web address. Search keywords, campaign labels, file names, user-entered Japanese text, and values copied from spreadsheets often contain spaces or reserved symbols that should not be pasted directly into a query string. By applying `encodeURIComponent`, the value becomes safe to embed in links, API requests, redirects, and browser-based automation.

The decode mode is equally useful when you receive percent-encoded data in analytics exports, server logs, webhook payloads, support tickets, or third-party dashboards and want to inspect the human-readable text immediately. You can refer to the character mapping guide to understand how special characters are transformed. Because the result updates as you type, the tool works well for learning how reserved characters are encoded and decoded.

Everything runs locally in the browser, which helps when you need to inspect sensitive parameters without uploading them anywhere. The tool also displays both input and output character counts, making it easy to understand the impact of encoding on string length.