— Encoders & generators

URL Encoder / Decoder

Percent-encode text for safe use in URLs and query strings, or decode an encoded URL back to readable text — live, in your browser.

— What it does

The URL Encoder / Decoder is a free tool that converts text to and from URL-safe percent-encoding. It uses encodeURIComponent to escape characters like spaces, ampersands, and slashes for query parameters, offers full-URL encoding when you only want to escape unsafe characters, and decodes any percent-encoded string back to plain text. Everything runs locally — nothing you type is uploaded.

  • Encode with encodeURIComponent for query values, or encodeURI to keep URL structure intact.
  • Decode percent-encoded strings like %20 and %3D back to readable characters.
  • Live conversion as you type, with one-click copy of the result.
  • Runs entirely in your browser — nothing you paste is ever uploaded to a server.

How to use it

1

Choose encode or decode

Use the Encode / Decode toggle to set the direction you want to convert.

2

Paste your text or URL

Type or paste the value into the input. When encoding, pick component-style or full-URL encoding.

3

Copy the result

The output updates instantly. Copy the encoded or decoded string to your clipboard.

Frequently asked

When should I use encodeURIComponent vs encodeURI?
Use component encoding (encodeURIComponent) for individual query-string values, since it escapes characters like &, =, /, and ? that would otherwise break the query. Use full-URL encoding (encodeURI) when you have a complete URL and only want to escape spaces and other unsafe characters while preserving the URL structure.
Why does decoding fail with an error?
Decoding throws a URI malformed error when the input contains an invalid percent sequence, such as a lone % sign or %ZZ. Check that every % is followed by two valid hexadecimal digits, then try again.
What does %20 mean?
%20 is the percent-encoded form of a space character. Percent-encoding replaces unsafe characters with a % followed by their two-digit hexadecimal byte value, so a space (byte 0x20) becomes %20.
Is my data uploaded anywhere?
No. All encoding and decoding happens locally in your browser with JavaScript. Nothing you type is sent to a server or stored, so it is safe for URLs containing tokens or sensitive parameters.

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← All free tools

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