Question 1

What is URL encoding (percent encoding)?

Accepted Answer

URL encoding, also known as percent encoding, is a mechanism for encoding information in a Uniform Resource Locator (URL) under certain circumstances. It converts special characters to a percent sign (%) followed by two hexadecimal digits representing the character's UTF-8 byte value. This ensures URLs remain valid and can be transmitted safely over the internet using the ASCII character set.

Question 2

When should I use URL encoding?

Accepted Answer

Use URL encoding when: passing special characters in query parameters (e.g., spaces, &, =, ?), including user input in URLs, sending non-ASCII characters (Unicode, emojis, international text) in URLs, constructing API requests with dynamic parameters, or handling data that might contain URL-reserved characters. Essentially, encode any data that will appear in a URL and might contain special characters.

Question 3

Does the URL encoder handle Unicode and international characters?

Accepted Answer

Yes, our URL encoder fully supports Unicode characters including emojis, Chinese characters, Arabic script, Cyrillic, and all international text. These characters are first converted to UTF-8 byte sequences, then each byte is percent-encoded. For example, the Chinese character 中 becomes %E4%B8%AD. This ensures URLs work correctly across all languages and regions.

Question 4

Can I encode a complete URL or just components?

Accepted Answer

Both! Use "Full URL" mode to encode special characters within a complete URL while preserving the structure (protocol, domain, path). Use "Component" mode (equivalent to encodeURIComponent) for encoding individual query parameters or path segments. The difference is important: encoding a full URL preserves :// and ? characters, while component encoding treats all special characters as data.

Question 5

Is my URL or data stored when using the encoder?

Accepted Answer

No, absolutely not. All URL encoding and decoding happens locally in your browser using JavaScript. Your URLs, API endpoints, query parameters, and any sensitive data they contain are never transmitted to any server, stored in any database, or logged anywhere. This makes it safe for encoding URLs containing API keys, tokens, or confidential parameters.

Question 6

What characters need to be URL encoded?

Accepted Answer

Characters that must be encoded include: space (becomes %20 or +), non-ASCII Unicode characters, reserved characters when used as data (&, =, ?, #, /), unsafe characters (<, >, {, }, |, , ^, ~, [space]), and the percent sign itself (% becomes %25). Unreserved characters (A-Z, a-z, 0-9, -, _, ., ~) never need encoding.

Question 7

What is the difference between encodeURI and encodeURIComponent?

Accepted Answer

encodeURI is designed for full URLs — it encodes special characters but preserves URL structure characters like : / ? #. encodeURIComponent is for URL components (query parameters, path segments) — it encodes everything including / ? # which would otherwise break URL structure. Use encodeURI for complete URLs, encodeURIComponent for individual parameters you're inserting into URLs.

Question 8

Why do spaces become %20 or + in URLs?

Accepted Answer

In the URL path and most contexts, spaces should be encoded as %20. However, in HTML form data submitted via GET method (application/x-www-form-urlencoded), spaces are traditionally encoded as + for historical reasons. Our tool handles both formats: %20 is the RFC 3986 standard, while + is the application/x-www-form-urlencoded convention.

URL Encoder/Decoder

Common Characters

URL Encode and Decode Online

Enter URL or Text

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What is URL Encoding (Percent Encoding)?

How URL Encoding Works

Safe and Unsafe Characters

Safe (Unreserved)

Reserved

Unsafe

When to Use URL Encoding

Query Parameters

API Requests

Form Submissions

International Characters

Encode vs Decode: When to Use Each

URL Encode

URL Decode

URL Encoder Features

Full & Component Modes

Unicode Support

Programming Examples

Privacy Protected

Common URL Encoding Issues

Double Encoding

Plus Sign Confusion

Encoding Entire URLs

Frequently Asked Questions

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