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URL Encoder & Decoder (Percent-Encoding)

Encode query parameters and URI components into percent-encoded ASCII or decode URLs back into readable characters.

Result
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How to Use the URL Encoder & Decoder (Percent-Encoding)

1
Paste your URL or text string into the input field.
2
Click "Encode URI Component" to convert spaces and symbols into safe percent representations (%20, %26, etc.).
3
Click "Decode URI Component" to restore percent-encoded strings to human-readable text.

Formula & Underlying Logic

RFC 3986 Percent-Encoding Standards

Uniform Resource Identifiers (URIs) reserve certain characters (such as ?, &, =, and spaces) for structural routing. Transmitting literal spaces or non-ASCII characters in query parameters requires translating byte values into %HH hexadecimal triplets.

Worked Step-by-Step Example

Encoding Spaces and Special Symbols

Plain String: salary tax & allowances

Percent-Encoded: salary%20tax%20%26%20allowances

Frequently Asked Questions

Yes. Our decoder automatically converts URL query plus signs (+) into standard space characters.

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Sep 26, 2026