URL encoder decoder

What is this tool?

Encode or decode a URL component such as the value of a query parameter. Reserved characters can otherwise be interpreted as part of the URL’s structure. This utility changes representation, not the meaning or trustworthiness of a destination.

How to use it

1. Read the input labels and limits below, then choose the operation that matches your task.
2. Choose Encode or Decode for the text you have.
3. Paste a single component or value and run the operation.
4. Review the output before incorporating it into a larger URL.
5. Check the result against the worked example or original file before copying, downloading or using it elsewhere.

Worked example

A value containing an ampersand can accidentally look like the start of another query parameter. Component encoding represents that character safely within the value. Encode each value at the point where the URL is assembled.

Questions & limits

How to use url encoder

Encode uses encodeURIComponent, which escapes reserved characters in a component such as a query value. Decode reverses percent escapes. Use this for individual parameter values rather than entire URLs, because encoding a complete URL also escapes its structural separators.

A practical example

The query value tea & coffee becomes tea%20%26%20coffee. Insert that value after a parameter name, such as ?q=tea%20%26%20coffee.

Know the limits

Decode rejects malformed percent sequences and invalid UTF-8. A plus sign stays a plus sign: form-encoded data sometimes uses + for a space and needs separate handling.

Tool documentation updated October 4, 2026.

When should I encode a URL component?

Encode a value before inserting it into a query parameter so spaces and reserved characters are represented safely. Avoid encoding an entire working URL when you only need to encode one parameter.

Can I decode the same value repeatedly?

Avoid doing so unless the surrounding format explicitly requires multiple layers. Decoding twice can turn an originally literal percent sequence into a different character.

Check the receiving system

Use a small known example first when connecting this result to an application. Encoding, formatting and color conversion each follow specific conventions, and the receiving system must expect the same convention. Keep an unchanged copy of important input before transforming it. Review identifiers and punctuation carefully rather than relying only on whether the operation completed. This page runs a focused utility; it does not validate the full behavior, security or business rules of the application where you will use the output.