Free URL Encoder & Decoder Online
Encode, decode, and parse web URLs, REST API parameters, and OAuth redirect URIs using calibrated RFC 3986 standards in browser memory.
Direct Answer & Pipeline Overview
URL Encoder & Decoder Online is a specialized, 100% client-side engineering utility developed by Atlyxen Studios. It processes calculations and conversions directly inside your browser memory using hardware-accelerated WebAssembly and WebGL, guaranteeing instant results with zero server file transfers and zero data retention.
How to Use the URL Encoder & Decoder Online
Choose Mode
Select Encoder & Decoder for direct string conversion, or Query Parser to inspect and edit URL parameters.
Enter URL or Text
Paste your web address, API endpoint, or percent encoded string into the editor.
Select Standard
Choose RFC 3986 Component, Full URI mode, or Form URL Encoded depending on your destination.
Copy or Open
Copy the formatted string to your clipboard or open the reconstructed URL directly.
Key Technical Capabilities
Bidirectional conversion: Instant percent encoding and decoding with one click input swapping
RFC 3986 strict component encoding, standard full URI mode, and x-www-form-urlencoded support
Interactive URL Query String Parser breaking URLs into protocols, hosts, paths, and fragments
Visual query parameters table allowing live editing, toggling on/off, adding, and deleting query keys
Pre-loaded sample payloads for OAuth 2.0 authorization, Google Analytics UTM parameters, and REST APIs
100% client side execution in browser memory with zero server logging and complete privacy
Frequently Asked Questions
What is percent encoding (URL encoding)?
Percent encoding represents characters that are reserved or not permitted in Uniform Resource Identifiers (URIs). It replaces characters with a percent sign followed by two hexadecimal digits representing the UTF-8 byte value (e.g. space becomes %20, ampersand becomes %26).
What is the difference between encodeURI and encodeURIComponent?
encodeURI is designed for entire URLs and preserves protocol and structural characters such as : / ? # &. encodeURIComponent is designed for individual query parameter values and escapes structural delimiters to prevent parameter injection.
How does form-urlencoded differ from standard percent encoding?
The application/x-www-form-urlencoded standard maps spaces to plus signs (+) instead of %20, which is standardly used by HTML forms and legacy HTTP POST requests.
Is any URL data sent to a remote server?
No. All string parsing, encoding, decoding, and query table updates run 100% locally in your web browser memory. Your sensitive API keys and tokens are never transmitted across the network.