Online URL Encoder & Decoder
Convert plain text and special characters into URL-safe percent-encoded strings, or decode percent-encoded URLs back into human-readable text. Handles all Unicode characters including accented letters, CJK scripts, and emoji.
Essential for working with query parameters, API requests, form submissions, and any context where special characters must be safely transmitted in URLs. All processing happens in your browser.
100% Client-Side Processing & Privacy Guarantee
All processing takes place strictly inside your client browser using WebAssembly, Canvas, and Web Workers. Your files, documents, and data never leave your device and are never sent to external servers.
Technical Specifications & Browser Capabilities
Local runtime details and instant zero-server processing environment
Step-by-Step Instructions
1. Enter Your Text
Paste a URL, query string, or plain text into the input field.
2. Encode or Decode
Click Encode to convert special characters to percent-encoded format, or Decode to restore encoded strings to readable text.
3. Copy the Result
Use the copy button to transfer the encoded or decoded output directly to your clipboard.
Core Advantages & Features
Full Unicode Support
Correctly handles multibyte characters, accented letters, Arabic, Chinese, Japanese, Korean text, and emoji using standard encodeURIComponent encoding.
Instant Two-Way Conversion
Switch between encoding and decoding with a single click. Swap input and output fields to quickly reverse operations.
Robust Error Handling
Gracefully handles malformed percent-encoded sequences with clear error messages instead of crashing silently.
Browser-Only Privacy
Your URLs, query parameters, and sensitive data are processed entirely in your browser and never transmitted to any server.
Frequently Asked Questions
What is URL encoding?
Why do special characters need to be encoded in URLs?
What is the difference between encodeURI and encodeURIComponent?
How does URL encoding handle Unicode characters?
Is it safe to decode URLs in this tool?
Related Online Tools
Online Base64 Encoder & Decoder
Encode and decode Base64 strings with full UTF-8 Unicode support. Free developer tool with instant swap, copy, and client-side processing.
Online JSON Formatter & Validator
Format, validate, prettify, and minify JSON data online. Free developer tool with syntax error highlighting, tree structure view, and 100% client-side privacy.
Online URL Slug Generator
Generate clean URL slugs from any title or text. Preserves non-Latin scripts (Arabic, CJK, Cyrillic) and normalizes diacritics. Free online SEO tool.
Free Online UUID Generator
Generate cryptographically secure UUID v4 identifiers instantly in your browser. Create one or hundreds of random UUIDs using the Web Crypto API — free, private, no sign-up.