URL Decoder
Decode percent-encoded characters, spaces, and query parameters in URLs and web links according to RFC 3986 standards.
Quick Answer & Understanding Your Result
A URL Decoder transforms percent-encoded strings (`%XX`) and form data back into human-readable UTF-8 plain text according to the IETF RFC 3986 standard in 0ms.
Core URL Percent-Decoding Capabilities
- Hexadecimal Sequence Conversion: Replaces
%20with space,%26with&,%3Fwith?, and%2Fwith/. - UTF-8 Multi-Byte Character Assembly: Reassembles multi-byte sequences into international Unicode characters (e.g.
%C3%A9→é). - Form Data '+' Translation: Converts
+signs in query strings to spaces when processing form-urlencoded payloads. - Structured Query Param Extraction: Automatically inspects and tabulates embedded URL search parameters into structured JSON.
Web Development & Debugging Applications
- Access Log Analysis: Decoding encoded tracking parameters from server web server logs.
- API Debugging: Inspecting encoded query strings from REST endpoints and OAuth callback flows.
Enter your percent-encoded URL or text above to decode characters and inspect query parameters instantly.
Formula & Calculation Logic
Technical Specification & ASTParses hexadecimal %XX octets into UTF-8 binary streams and reconstructs original Unicode strings conforming to RFC 3986.
Step-by-Step Guide
Enter Encoded URL or Text
Paste percent-encoded string (e.g. https%3A%2F%2F...) or encoded query string.
Select '+' Decoding Mode
Choose whether to convert '+' signs into spaces (Form Data mode) or preserve them literally.
Review Decoded Text & Query Parameters
Inspect clean readable text and structured JSON table of extracted parameters.
1-Click Copy Result
Copy the decoded text or query parameters directly into your clipboard.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Decode Encoded Search URL | Decodes %26 to &, + to spaces, and extracts query parameter values. | ||
| Nested OAuth Redirect Parameter | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
IETF RFC 3986 - Uniform Resource Identifier (URI): Generic Syntax
WHATWG URL Living Standard - Percent-Decoding
MDN Web Docs - decodeURIComponent()
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Decoded String = decodeURIComponent(EncodedString.replace(/+/g, ' '))
Last Reviewed: August 21, 2026
Primary Source: IETF RFC 3986 - Uniform Resource Identifier (URI): Generic Syntax
Reference Document: WHATWG URL Living Standard - Percent-Decoding
Computation Privacy: 100% client-side 0ms computation, zero data retention
All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.