URL Encoder Decoder & Query Inspector
Encode or decode URLs and inspect query parameters in one place. Debug tracking links, API query strings, and encoded values quickly in your browser.
Encoded preview
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Decoded preview
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Query inspector (0 parameter(s))
No query parameters found.
Built for practical URL debugging
Real-world example
https://site.com/callback?next=%2Fdashboard%3Ftab%3Dbilling&utm_source=newsletter&utm_medium=email
Decode to read quickly, then inspect each query key/value to confirm routing and tracking values.
URL bugs are often tiny but expensive: one broken escape sequence, one malformed redirect param, or one duplicate query key can break payment flows, OAuth callbacks, and campaign attribution.
This page combines encoding/decoding and query inspection in one place so you can verify links before they reach production.
What to validate before shipping
- Redirect target parameters (e.g. next, returnTo) decode correctly.
- UTM keys are present and not overwritten by duplicates.
- Encoded values do not break when copied across systems.
- Empty values are intentional, not a serialization bug.
- Special characters remain valid after decode/re-encode cycles.
High-impact use cases
Marketing QA: Confirm campaign links preserve all UTM fields.
OAuth Debugging: Verify callback, state, and code parameters.
API Testing: Quickly inspect encoded query values in requests.
Support Ops: Reproduce user-reported broken URLs in seconds.