URL Encoder
Percent-encode strings, query parameters, full URLs, form submissions, and Base64 URL-safe data adhering to RFC 3986 and WHATWG standards with custom casing options.
Runs in-memory with zero network requests for complete parameter privacy.
URL Encoding Standard & Formatting
Professional URL & Percent-Encoding Engine
Uniform Resource Identifiers (URIs) require specific character encoding to prevent conflicts between URL structure delimiters (?, &, #, /, :) and user data payload values. Percent-encoding converts reserved and non-ASCII characters into hexadecimal byte sequences preceded by '%'.
This utility provides multi-standard encoding including encodeURIComponent, full URL encodeURI, form-urlencoded (+ for space), RFC 3986 strict percent-encoding, and Base64 URL-safe format. All conversions run locally in your browser.
Core Tool Capabilities
- 5 Encoding Formats: Support for encodeURIComponent, encodeURI, application/x-www-form-urlencoded, strict RFC 3986, and Base64 URL-safe formats.
- Space & Hex Customization: Toggle space encoding between %20 and plus (+), and choose uppercase (%2F) or lowercase (%2f) hexadecimal outputs.
- Byte & Character Analytics: Real-time tracking of original byte size, encoded character length, and escaped sequence counts.
- Local Export: Copy encoded URL output to clipboard or download as text file.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • Web Development & API Integration
- • Web Analytics & Marketing Tracking
- • Form Submission & Data Transfer
- • Security & Penetration Testing
Technical Specifications & Platform Limits
Full compliance with modern web URI specifications and HTTP query string standards
Safely percent-encodes multi-byte Unicode strings, emojis, and non-Latin character sets
Instant execution using client-side JavaScript engine
No remote logging. The strings remain strictly in browser memory
Step-by-Step Workflow
Input URL or Query String
Paste your raw URL, query parameters, or string into the left-hand text editor.
Select Encoding Standard
Choose your target format (encodeURIComponent, encodeURI, Form URL-Encoded, RFC 3986, or Base64 URL).
Configure Formatting Options
Toggle space encoding (+) or lowercase hex characters if needed.
Copy or Download Output
Copy the resulting percent-encoded string to your clipboard or download as a text file.
Practical Real-World Use Cases
Web Development & API Integration
Developers encode query parameters when constructing GET request parameters for REST APIs.
Web Analytics & Marketing Tracking
Developers safely encode UTM campaign parameters and redirect targets inside URL links.
Form Submission & Data Transfer
Developers format form payload key-value pairs matching application/x-www-form-urlencoded specification.
Security & Penetration Testing
Developers test web application parameter handling against percent-encoded payloads.
Frequently Asked Questions
- What is the difference between encodeURI and encodeURIComponent?
- encodeURI preserves valid URL delimiters like ':', '/', '?', '#', and '&' so the full URL structure remains valid. encodeURIComponent encodes all characters including delimiters, making it suitable for single query string parameter values.
- Why do some URLs use '+' instead of '%20' for spaces?
- The application/x-www-form-urlencoded standard historical convention uses '+' to represent space characters in HTML form submissions, while standard percent-encoding uses '%20'.
- Does this tool support Base64 URL-safe encoding?
- Yes. Base64 URL-safe replaces standard Base64 '+' and '/' characters with '-' and '_' to make the output safe for web links without trailing equals (=) padding.
- Is my URL data stored on any server?
- No. All encoding processes take place entirely inside your web browser.
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Master this tool with Guides & Articles
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