Free Toolkit

URL DecoderDecode percent-encoded URL strings back to readable text.

URL Decoder illustration
📝

URL Decoder

Decode percent-encoded URL strings back to readable text.

How to Use
1

Paste Encoded URL

Paste the percent-encoded URL or string.

2

Auto-Decode

Percent-encoded sequences are converted back to characters.

3

Copy Result

Copy the decoded readable text.

What Is URL Decoder?

The URL Decoder converts percent-encoded URL strings back to readable text. Sequences like %20 become spaces, %26 becomes &, and multi-byte UTF-8 sequences are reassembled into their original characters. This is useful for reading encoded URLs, debugging API requests, decoding query parameters, and understanding the actual content of encoded strings.

Why Use Our URL Decoder?

  • Read and understand encoded URL parameters
  • Debug API requests with encoded query strings
  • Decode URLs copied from browser address bars
  • Convert percent-encoded filenames back to readable names

Common Use Cases

API Debugging

Decode encoded API request URLs to inspect parameter values.

URL Analysis

Decode long encoded URLs to understand their content.

Data Extraction

Decode query string values from log files or analytics data.

Link Inspection

Check what a percent-encoded link actually points to.

Technical Guide

The tool uses JavaScript's built-in decodeURIComponent() function to reverse percent-encoding. Each %XX sequence is converted back to its byte value, and multi-byte UTF-8 sequences are properly reassembled into Unicode characters. The function throws a URIError if the input contains invalid percent-encoding sequences (like %ZZ or incomplete sequences), which the tool catches and reports. The plus sign (+) is preserved as-is since standard percent-encoding uses %20 for spaces; the + convention is specific to application/x-www-form-urlencoded format.

Tips & Best Practices

  • 1
    Use this to inspect encoded URLs from browser address bars
  • 2
    Invalid encoding sequences will show an error message
  • 3
    For form-encoded strings where + means space, replace + with %20 first
  • 4
    Handles multi-byte UTF-8 character sequences correctly

Related Tools

URL Encoder

Encode text for safe use in URLs with percent-encoding.

Text Tools

HTML Entity Decoder

Decode HTML entities back to their original characters.

Text Tools

URL Extractor

Extract all URLs (http/https) from text and list unique results.

Text Tools

JSON Escape/Unescape

Escape text for JSON strings or unescape JSON string values.

Text Tools

Word Counter

Count words, unique words, characters, and see word frequency in any text.

Text Tools

Character Counter

Count characters with and without spaces, plus word, line, and paragraph counts.

Text Tools

Frequently Asked Questions

QWhy does + stay as + and not become a space?
Standard URL encoding uses %20 for spaces. The + for spaces is a form-encoding convention. Replace + manually if needed.
QWhat causes the error message?
Invalid percent-encoding like %ZZ, lone % signs, or incomplete multi-byte sequences cause decoding errors.
QCan I decode an entire URL?
Yes, but be aware that some structural characters like / and ? may also get decoded if they were encoded.
QDoes it handle double-encoding?
It decodes one level. For double-encoded strings like %2520 (which is %20 encoded), run the decoder twice.
QWhat about Unicode characters?
UTF-8 multi-byte sequences like %E2%82%AC are properly decoded to their Unicode characters (€ in this case).

About URL Decoder

URL Decoder is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.