URL Encode/Decode

Encode or decode your URLs safely. It is completely free and very easy to use.

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Technical Overview: How URL Encode/Decode Works

URL Encode / Decode converts strings to and from Percent-Encoded format (RFC 3986), ensuring URLs safely transmit special characters, spaces, and non-ASCII text over HTTP query parameters.

Implements standard RFC 3986 percent-encoding using native JavaScript `encodeURIComponent()` and `decodeURIComponent()`. Replaces reserved and unsafe characters with `%` followed by two hexadecimal digits representing their UTF-8 byte values (e.g. spaces to `%20`, `&` to `%26`).

Practical Examples & Usage

Percent-Encoding URL Query Parameter with Special Characters

Input:Text: "search=developer tools & code=100%"

Output:Encoded: search%3Ddeveloper%20tools%20%26%20code%3D100%25

Encodes spaces to `%20`, ampersands to `%26`, equals signs to `%3D`, and percent signs to `%25`.

Real-World Applications & Use Cases

Encoding search query parameters, redirect URLs, and OAuth callback parameters in web development.
Decoding percent-encoded query strings from server logs, tracking links, and API request URLs.
Preventing parameter injection attacks where unencoded `&` or `=` characters break URL query parsing.
Encoding non-ASCII international characters in URL paths and deep links.

How to use URL Encode/Decode

Paste the text or URL you need to process into the input field.
Click "Encode" to convert special characters into safe URL formats (e.g., spaces become %20).
Click "Decode" to revert an already encoded URL back into readable text.
Review the processed string in the output area below.
Click the "Copy" button to grab the result instantly.

Edge Cases & Limitations

•`encodeURI()` differs from `encodeURIComponent()`; `encodeURI()` preserves full URL protocol delimiters (`:`, `/`, `?`, `#`), whereas `encodeURIComponent()` encodes all special characters.
•Plus signs (`+`) represent spaces in legacy `application/x-www-form-urlencoded` query strings but `%20` is the strict RFC 3986 standard.
•Malformed percent-sequences (e.g. `%ZZ` or incomplete `%2`) will trigger a URIError during decoding.

Recommended Best Practices

•Always use `encodeURIComponent()` on individual query parameter values rather than encoding the entire URL string at once.
•Decode URL parameters at the receiving API endpoint before querying databases or performing business logic.
•Ensure UTF-8 encoding is used consistently when encoding international non-Latin character sets.

Frequently Asked Questions

Why do URLs need to be encoded?

URLs can only be sent over the Internet using the ASCII character-set. Encoding translates unsafe or special characters (like spaces or ampersands) into a globally accepted format.

Is my data secure?

Yes. The encoding and decoding functions utilize native browser APIs, ensuring your sensitive links, tokens, and parameters are never transmitted to our servers.

What is the difference between encodeURI and encodeURIComponent?

Our tool correctly uses encodeURIComponent to safely encode all special characters, ensuring entire query strings and parameters are transmitted without breaking the URL structure.

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