URL Decoder

What Is a URL Decoder?

URL decoding is essential for debugging web applications, reading server logs, and processing URL-encoded form data. When users submit forms or APIs receive requests, the data arrives percent-encoded. Decoding reveals the original text, making it readable for debugging and data extraction. This tool decodes the full range of percent-encoded characters following RFC 3986.

Example

URL-Encoded Input:

Hello%20World%21%20%26foo%3Dbar

Text Output:

Hello World! &foo=bar

How to Use This Converter

Paste your URL-Encoded data into the input panel.
View the converted Text output — it updates instantly.
Click Copy to copy the result to your clipboard.
Verify the output matches your expectations before using in production.

Developer Tips

Percent-encoded URLs from analytics tools are unreadable until decoded. Campaign tracking parameters with encoded equals signs and ampersands become readable after a single decode pass.
Some services double-encode URLs when passing them as parameters. If decoding once still shows %25 sequences, decode again - the content was encoded twice.
Server logs store URLs in encoded form. When searching logs for a specific page, you may need to search for both the encoded and decoded versions since different log formats handle encoding differently.

Related Converters

All conversions run entirely in your browser — no data is sent to any server. For the specification, see RFC 3986 — URI Generic Syntax.

Frequently Asked Questions

What is URL decoding?

URL decoding reverses percent-encoding — it converts %XX sequences back to their original characters. %20 becomes a space, %26 becomes &, %3D becomes =. This reveals the original text hidden behind URL-safe encoding.

When do I need to decode URLs?

Decode when reading query parameters from a URL, debugging API requests, analyzing web server logs, or extracting data from URL-encoded form submissions. Encoded URLs are human-unreadable, so decoding is essential for debugging.

Can I decode double-encoded URLs?

Yes — sometimes URLs are accidentally encoded twice (e.g., %2520 instead of %20). Run the decoder twice, or check for double-encoding if the first pass still shows percent signs.

Is URL decoding safe?

Decoding itself is safe, but be cautious about using decoded values directly in HTML or SQL — they may contain malicious content (XSS or injection attacks). Always sanitize decoded input before rendering or executing it.

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