#178 · Converters & Encoding Text Tool

URL Decoder

URL Decoder turns percent-encoded sequences back into readable text and flags malformed or double-encoded URL fragments.

Text Input

Converter input

Encoded URL, query value, or API parameter.

Decode target

Plus handling

Convert + to spaces Live decoding Highlight malformed escapes Detect double encoding

Recent History

No history yet.

How to use this text tool

Paste or upload your text into the input box.
Choose the conversion format and any repair or live-preview options.
Run the tool, then copy, download, or export the result.

What this tool does

Decoded output = percent sequences such as %20 converted to their UTF-8 characters.

If the result still contains encoded sequences like %2520, the input may have been encoded twice.

Example

Example input: hello%20world%3Fname%3DCallText%26lang%3Den. Run the tool to generate the converted result and view integrity metrics.

Use cases

Programming and debugging
API and web development
Encoding lessons and documentation
Data cleanup before import or export

Tips for better output

Use auto-detect when pasted data has mixed separators or formats.
Check the data integrity score before copying output into code.
Use JSON or CSV export when documenting conversion results.
For non-ASCII text, prefer Unicode or UTF-8 workflows.

Processing details

This tool runs locally in the browser and performs deterministic text conversion without uploading your input. Metrics include size, validity, and character-level analysis where relevant.

Browser text decoding may display binary data as replacement characters. For sensitive secrets, remember that encoding is not encryption.

FAQ

How do I decode a URL encoded string?

Paste the encoded value and run the decoder. Percent sequences such as %20 are restored to readable characters.

Why is my URL encoded twice?

Patterns such as %2520 indicate that the percent sign itself was encoded. Decode once more only if that second layer is intentional.

How do I fix malformed URL encoding?

Malformed escapes such as % or %2 are invalid. The tool flags them so you can repair or remove the broken sequence.

How do I decode API query parameters?

Paste the parameter value, enable plus-to-space handling if needed, and decode it into readable text.

Why does %20 become a space in URL decoding?

%20 is the percent-encoded UTF-8 byte for a space character, so decoding restores it as a normal space.

Related text tools

Text to HTML #161 · Converters & Encoding →HTML to Text #162 · Converters & Encoding →Text to Binary #167 · Converters & Encoding →Binary to Text #168 · Converters & Encoding →

Conversion modules

Module	Purpose
Conversion Engine	Applies the selected encoder or decoder.
Validation	Detects invalid input, malformed sequences, or unsupported characters.
Data Integrity Score	Scores conversion safety from 0 to 100.
Export Tools	Copies or downloads output as TXT, CSV, or JSON.

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