URL Decoder
Decode percent-encoded URLs, query strings, and nested escaped sequences back into readable UTF-8 text with recursive multi-pass resolution and automatic query parameter parsing.
Decodes entirely client-side with zero telemetry or remote analytics.
URL Percent-Decoding Engine Configuration
Professional URL & Percent-Decoding Engine
URLs frequently arrive encoded with percent sequences (such as %20, %3A, %2F) or nested double-encodings (%2520). Reading or debugging these obfuscated strings manually can be difficult when inspecting API requests or web logs.
This tool decodes percent-encoded strings back to clean UTF-8 readable text. It includes a double-decoding pass option for deeply nested strings and automatically parses query parameters into a structured key-value table.
Core Tool Capabilities
- Percent Sequence Decoding: Converts percent-encoded hex sequences (%20, %3A, %2F) back to original characters.
- Double-Decoding Pass: Support for multi-pass decoding of double-encoded or nested URL parameters.
- Query Parameter Inspector: Extracts and displays query parameters as a clean, scannable key-value parameter breakdown.
- Local Export: Copy decoded text to clipboard or export directly as a plain 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 Log & Analytics Debugging
- • API Development & Testing
- • Security Analysis
- • Data Extraction
Technical Specifications & Platform Limits
Converts percent hex representations back to standard UTF-8 text and Unicode characters
Gracefully parses partial or invalid percent sequences without throwing runtime errors
Instant execution directly within your web browser
All URL decoding is performed locally on your device without server transmission
Step-by-Step Workflow
Input Encoded URL
Paste your percent-encoded URL or string into the top input text area.
Toggle Multi-Pass Decoding
Enable the double-decoding pass checkbox if decoding nested %25 sequences.
Review Decoded Output
Inspect the decoded plain text result and the automatically extracted query parameters table.
Copy or Download
Click Copy Result to save the decoded text to your clipboard or download as a text file.
Practical Real-World Use Cases
Web Log & Analytics Debugging
Developers decode obfuscated URL parameters in web access logs, referrer strings, and tracking links.
API Development & Testing
Developers inspect incoming query parameters and webhook payload URLs during API integration.
Security Analysis
Developers de-obfuscate percent-encoded payloads during web application security reviews.
Data Extraction
Developers extract readable values from complex redirect URLs and tracking links.
Frequently Asked Questions
- How does the tool handle malformed percent sequences?
- The engine isolates invalid percent sequences and decodes valid portions without crashing or throwing errors.
- What is double-decoding pass?
- Double-decoding runs a second pass over the decoded output to resolve nested encodings, such as %2520 which decodes to %20 on pass 1 and space on pass 2.
- Are query parameters extracted automatically?
- Yes. Any URL query string containing '?' or '=' is automatically parsed into a structured key-value list.
- Is my URL content kept private?
- Yes. Decoded URLs remain strictly in your browser memory.
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