DukoTools

URL Encoder Decoder

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Encode and decode URL strings with visual change highlighting.

Free Forever
No Signup Required
No Files Stored

Diff highlight

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<iframe src="https://dukotools.com/tools/url-encoder-decoder?embed=1" width="100%" height="600" frameborder="0" allow="clipboard-write" loading="lazy" title="url-encoder-decoder tool"></iframe>

About URL Encoder Decoder

URL Encoder Decoder converts unsafe characters into percent-encoded form and decodes encoded strings back to readable text. This is essential for query parameters, callback URLs, signatures, and interoperable API requests. The tool supports both full URL strings and component-level encoding workflows. A simple diff highlight shows what changed between input and output, helping users verify transformations before deployment. It is lightweight, fast, and useful for QA, support, and engineering teams.

Key Features

  • Bi-Directional Conversion

    Switch between encode and decode workflows instantly.

  • Live Output

    Output updates as you type to accelerate debugging loops.

  • Diff Highlight

    Visual cues reveal changed segments for confidence and review.

  • Error Feedback

    Decode errors are surfaced clearly for malformed input strings.

  • Copy Support

    Copy transformed URL values directly into your request tooling.

  • Shareable State

    Mode and key parameters are shareable through URL state.

How to Use

  1. 1

    Choose encode or decode mode

    Set the tool mode based on your transformation direction.

  2. 2

    Paste input string

    Add URL or component text in the input area.

  3. 3

    Review transformed output

    Inspect resulting encoded or decoded string in the output panel.

  4. 4

    Verify diff highlight

    Use highlighted segments to confirm only expected characters changed.

  5. 5

    Copy final value

    Copy output for use in APIs, links, or debugging tools.

Real-World Use Cases

Query Parameter Safety

A developer encodes user-provided filter text before appending to request URLs.

Webhook Debugging

A QA engineer decodes callback payload links to verify exact values.

Support Ticket Reproduction

A support engineer recreates encoded URL flows from user-provided logs.

Frequently Asked Questions

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