Encode or decode URLs instantly with real-time auto-detection. Parse URLs, validate structure, bulk process, and handle complex query strings — all securely in your browser.
✦ Auto-Detection✦ URL Parsing✦ Bulk Processing✦ UTF-8 Support
📝 Input
0 B
📁 Drop file here
📦 Output
Ready0 B
📋 Bulk Processing — One URL per line
Input Size0 B
Output Size0 B
Size Change0%
Encoded Chars0
ModeAuto
Protocol
—
Hostname
—
Port
—
Pathname
—
Search / Query
—
Hash / Fragment
—
Origin
—
Query Parameters
—
Encode as Component (encodeURIComponent)
Spaces as + instead of %20
Prevent Double Encoding
Encode Full URI (encodeURI)
Real-Time Processing
Auto URL Validation
How It Works
Encode or Decode in 3 Simple Steps
Process URLs instantly with our intelligent auto-detection engine. No signup, no server — everything runs in your browser.
1
Paste Your Input
Paste a URL, query string, or any text that needs encoding or decoding into the input area.
2
Auto-Detect Mode
The tool detects if your input needs encoding or decoding automatically. Or manually pick a mode.
3
Get Instant Results
Results appear in real-time as you type. Copy, download, or swap input/output with one click.
4
Analyze & Validate
Use the URL Parser to inspect URL components, validate structure, and check for issues.
Features
Everything You Need for URL Processing
A comprehensive toolkit built for developers, SEO specialists, and web professionals.
⚡
Real-Time Processing
Results update instantly as you type or paste. No need to click buttons — see encoded/decoded output live.
🧠
Smart Auto-Detection
Automatically determines whether input needs encoding or decoding based on content analysis and percent-encoded patterns.
🔗
Full URL Parser
Break down any URL into protocol, hostname, port, path, query parameters, and fragment. Inspect every component.
🛡️
Double Encoding Prevention
Intelligently avoids re-encoding already-encoded characters, preventing %2520 and similar corruption issues.
📋
Bulk Processing
Process multiple URLs at once — paste them one per line and encode or decode them all simultaneously.
✅
URL Validation
Detect malformed URLs, missing protocols, invalid characters, and structural issues with clear visual feedback.
🔄
Encode & Decode Modes
Choose between encodeURI, encodeURIComponent, or full encoding. Control space handling with + or %20 format.
🌍
UTF-8 & Non-ASCII Support
Properly handles international characters, emojis, CJK text, and any Unicode content with UTF-8 percent-encoding.
🔒
100% Private & Secure
All processing happens entirely in your browser. No data is ever sent to any server. Your URLs stay private.
📊
Size Statistics
Track input/output sizes, size changes, and count of encoded characters to understand the impact of encoding.
⬇️
One-Click Download
Download processed results as a .txt file instantly. Also supports one-click copy to clipboard.
🎯
Selective Encoding
Choose between encoding the full URL or just query parameter values — preserve URL structure while encoding data.
FAQ
Frequently Asked Questions
URL encoding (also called percent-encoding) converts special characters like spaces, accents, and non-ASCII characters into a format that can be safely transmitted over the internet. For example, a space becomes %20, and é becomes %C3%A9 in UTF-8 encoding. This is essential because URLs can only contain a limited set of ASCII characters.
encodeURI() is designed to encode a full URL — it preserves characters like :, /, ?, #, &, = that are part of URL structure. It only encodes characters that are not allowed in URLs.
encodeURIComponent() encodes ALL special characters including structural ones. Use it for encoding individual query parameter values, like encoding "John Doe" to "John%20Doe" before placing it in a URL parameter.
Double encoding happens when you encode text that is already encoded. For example, encoding %20 (a space) again turns the % into %25, producing %2520 — which is no longer a space when decoded once. This tool's "Prevent Double Encoding" option detects already-encoded sequences and skips them, ensuring clean output.
Absolutely. All encoding and decoding happens 100% in your browser using JavaScript. No data is ever sent to any server. Your URLs, query strings, and any text you process remain completely private on your device. We don't use cookies, analytics, or any tracking on this tool.
Yes! The tool uses UTF-8 encoding which supports all Unicode characters. This includes accented characters (café → caf%C3%A9), CJK text (你好 → %E4%BD%A0%E5%A5%BD), Arabic, Cyrillic, emojis (🎉 → %F0%9F%8E%89), and any other Unicode text.
The auto-detection algorithm analyzes your input for percent-encoded sequences (like %20, %3A, %2F). If it finds a significant number of these patterns that are valid percent-encoded bytes in UTF-8, it determines the input needs decoding. Otherwise, it assumes encoding is needed. A visual indicator shows the detected mode in real-time.
Yes! Proper URL encoding is important for SEO. Search engines need correctly encoded URLs to crawl and index your pages. This tool helps you ensure URLs are properly formatted, validate URL structure, and check that special characters in URLs are correctly encoded for optimal SEO performance.