URL Encoder & Component Decoder Online

About Our Free URL Encoder & Decoder Tool

Uniform Resource Identifiers (URIs) only permit a specific subset of ASCII characters. Any reserved characters, spaces, punctuation, or non-ASCII unicode symbols must be converted using percent-encoding (such as turning spaces into %20) to prevent broken links, failed API requests, and web server errors. Whether building web scrapers, debugging REST API endpoints, or passing dynamic query parameters, having an exact URL encoding tool is essential.

UtilDash's URL Encoder & Decoder supports both standard full-URL encoding and component-level encoding (encodeURIComponent). It translates reserved characters like ?, &, =, /, and # accurately based on your chosen mode, preventing issues with nested URLs and tracking strings.

Everything runs client-side in your browser, ensuring confidential API tokens, webhook parameters, and sensitive links are never transmitted or logged.

Avoiding Common API Parameter Traps: One of the most frequent bugs in REST API integrations occurs when query parameter values contain ampersands (&) or plus signs (+). Without proper component-level percent-encoding, the receiving web server interprets an unencoded ampersand as the start of a new parameter rather than part of the string value. Utilizing encodeURIComponent prevents broken payloads and parameter drops.

Key Features

Standard RFC 3986 Compliance — Strict, accurate percent-encoding standards
Dual Mode Support — Choose between full URL encoding and parameter component encoding
Bi-Directional Operation — Switch easily between Encode and Decode modes
Instant Local Processing — Converts text in milliseconds with zero network requests
One-Click Clipboard Copy — Streamlined workflow for developers and QA engineers

How to Use URL Encoder & Decoder

Choose whether you want to Encode or Decode your string.
Paste your URL, query string, or parameter into the input area.
Review the converted output in real time.
Click Copy to save the result to your clipboard.

Frequently Asked Questions

What is the difference between encodeURI and encodeURIComponent?

encodeURI preserves protocol and domain separators (like :// and /), while encodeURIComponent encodes all special characters, making it suitable for passing a complete URL as a query parameter value.

What is percent-encoding?

Percent-encoding replaces unallowable characters in a URL with a percent sign (%) followed by their two-digit hexadecimal ASCII/UTF-8 representation (for example, a space becomes %20).

Does this tool support non-English characters and symbols?

Yes. Multi-byte UTF-8 characters are correctly encoded into their corresponding percent-encoded byte sequences.

Why does a plus sign (+) sometimes turn into a space in URLs?

Under application/x-www-form-urlencoded standards (used in HTML forms), a plus sign represents a space. In modern URL query strings, spaces should be encoded as %20 to avoid ambiguity.