How URL Percent-Encoder, Decoder & UTM Query Parameter Parser Works & When to Use It
Percent-encode or decode URLs (`encodeURIComponent` / `decodeURIComponent`) and inspect query string parameters. Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server.
Step-by-Step Instructions
- Enter the labelled values or choose an example.
- Run the tool and review the result and its assumptions.
- Copy or download the result. Reset restores defaults; Undo restores the previous settings.
Worked Examples
| Scenario | Input Parameters | Example Output |
|---|---|---|
| Percent-Encode Query String with Spaces & % | {"inputStr": "GST Calculator India & slabs=18%", "mode": "encode"} |
GST%20Calculator%20India%20%26%20slabs%3D18%25 |
| Decode "GST%20Calculator%20India%20%26%20slabs%3D18%25" | {"inputStr": "GST%20Calculator%20India%20%26%20slabs%3D18%25", "mode": "decode"} |
GST Calculator India & slabs=18% |
Formula, reference and effective date
- Reference Standard / Authority: RFC 3986 URI Percent-Encoding Standard
- Applicable Period / Effective Date: 2025-2026
- Privacy & Execution Mode: Browser-Local Only (Zero Server Upload) (None (Pure Vanilla JS & Web Crypto))
Important Limitations & Edge Cases
Handles malformed % sequences gracefully with a clear error message. Check the assumptions and output against your intended task before relying on the result.
Frequently Asked Questions (FAQs)
1. Is URL Percent-Encoder, Decoder & UTM Query Parameter Parser completely free to use without registration?
Yes. Every tool on Easy Tools Today is 100% free with no paywall, no sign-up, and no subscription required.
2. Are the numbers or files I enter uploaded to any server?
Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server.
3. What should I check before using the result?
Check the assumptions and output against your intended task before relying on the result. Reference: RFC 3986 URI Percent-Encoding Standard.