Percent-Encode &
Decode URL Strings
Encode URLs for parameters transmission safely, decode structured endpoints instantly. Native browser execution guarantees zero data leaks.
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Input Chars
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Input Bytes
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Output Chars
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Output Bytes
Load Common URL Formats
Click any card to instantly load the preset example into the encoder input field.
Simple 4-Step Process
Paste URL
Paste your raw query parameters or percent-encoded strings into the Input area.
Select Mode
Toggle between encode and decode, then choose the encoding precision (e.g. URI Component).
Process
The tool calculates ASCII hexadecimal substitutions instantly directly in your browser.
Copy Result
Click the copy button to capture the output and paste it into your code parameters safely.
Designed For Web Workflows
Ensures proper character transmission across networks and data pipelines.
Web Developers
Format callbacks or callback callbacks parameters cleanly for JavaScript/Node.js.
API Testing
Encode OAuth state params, access tokens, and JSON strings to prevent payload request breaking.
SEO Managers
Fix UTM variables with spaces or non-ASCII characters to keep web logs clean and trace tracking.
Backend Services
Perfect for Python, Django, Node.js and Java programmers resolving character mismatch bugs.
Handcrafted Performance
Unicode Support
Fully compatible with emojis, special symbols, and foreign languages encoding natively.
Base64 Converter
Option to encode or decode variables to binary safe Base64 headers easily.
Browser-Only
Processes raw sequences locally without transmitting query tokens across the web.
Speed Optimized
Sub-millisecond processing speeds for large text variables and payloads.
Offline Ready
Capable of processing conversions even when disconnected from the Internet.
Free Forever
100% free developer utility with no rate-limits or payload cap restrictions.
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OpenEncoding & Decoding Guides
What is URL Encoding?
Learn why specific characters break URL structures and how percent-encoding fixes network packets.
Read Guide →encodeURI vs encodeURIComponent
A complete deep-dive comparing the two native JavaScript APIs and when to apply them safely.
Read Guide →URL Encoding Best Practices
Avoid query parameter parsing exceptions by standardizing OAuth tokens and callbacks encoding.
Read Guide →Frequently Asked Questions
URL encoding converts unsafe or non-ASCII characters into a safe ASCII sequence using a percent sign (%) followed by two hexadecimal digits. Spaces become %20, ampersands become %26, etc.
encodeURI encodes characters that are unsafe in a full URL but leaves structure separators like / ? & = # untouched. encodeURIComponent encodes absolutely everything except basic ASCII alphanumeric characters, which is ideal for query parameters.
Yes, 100% safe. All encoding and decoding logic runs strictly locally inside your web browser. No data is ever sent to our servers or stored on remote databases.
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