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Developer Tool

URL Encoder & Decoder

Encode and decode URLs and query string parameters safely online

Local Conversion
Zero Server Upload
Percent Encoding Standard
Offline Capable
Samples:

Input Content

Encode Mode
0 chars

Converted Result

🔄

Awaiting Output

Encoded or decoded result will appear here

URL Percent Encoding Guide

Learn about URL specification encoding, reserved characters, and data safety

How to Use URL Tool

  • 1
    Select Conversion Mode

    Select either "Encode" (converts spaces/special characters to `%XX` codes) or "Decode" (restores percent-encoded URLs back to readable format).

  • 2
    Enable Autopilot Filters

    Keep "Auto Mode" checked to run conversions in real-time as you type or paste queries into the editor sandbox.

  • 3
    Review Structured breakdowns

    Analyze the colored URL breakdown segment list to inspect protocols, query parameters, host domains, and hashes separately.

  • 4
    Export and Persist

    Click Copy or Download to save your results locally. The workspace preferences are safely stored locally in your browser cache.

Key URL Coding Rules

URL Encoding is also known as Percent Encoding, since it replaces non-ASCII characters with a `%` followed by their hex values.
Reserved characters are characters that have special meaning in URLs (e.g. `?` splits search parameters, `#` splits fragment hashes).
Spaces in URLs are converted either to `%20` (standard) or to a `+` symbol depending on the application context.
Browsers parse URL components deterministically, so protocols and domains must remain unencoded while query parameters are encoded.
All processes occur locally: The conversion scripts execute 100% locally in your browser. No server queries are triggered.

Frequently Asked Questions

What is URL encoding?

URL encoding converts unsafe URL characters into standard US-ASCII characters using percent escaping.

Why do URLs need to be encoded?

URLs can only contain specific alphanumeric characters. Unsafe characters (like spaces or brackets) must be encoded to prevent protocol parsing errors.

How do I decode a URL?

Paste your percent-encoded URL query into the input field. The tool will decode it back to a readable string.

What is the difference between encodeURI and encodeURIComponent?

`encodeURI` leaves URL routing symbols (like `/`, `?`, `:`) intact, while `encodeURIComponent` escapes all symbols, making it safe for query parameters.

Is my URL data safe?

Yes. The URL encoding and decoding operations happen locally in your browser, and no data is sent to a server.

Why does a space become %20 or +?

RFC 3986 specifies `%20` for spaces in URLs. HTML form submissions historical rules allow converting spaces to `+` in query blocks.

Can I encode non-ASCII characters?

Yes. The characters are converted to UTF-8 binary bytes first, then percent-escaped.

Why does my URL fail to decode?

Malformed percent sequences (like a `%` not followed by two hex digits) will trigger an invalid URI error.

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