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URL Encoding — Percent-Encoding Guide

6 min read

2026-02-10

A complete guide to URL encoding: how Percent-Encoding works, which characters are encoded, and why it is needed.

What Is URL Encoding?

URL encoding (Percent-Encoding) is a mechanism for replacing unsafe characters in a URL with their hexadecimal codes in the format %XX.

Why URL Encoding Is Needed

A URL can only contain certain ASCII characters. Spaces, Cyrillic characters, and special characters require encoding for proper transmission.

Which Characters Are Encoded

CharacterEncoded Form
Space%20 or +
&%26
=%3D
?%3F
#%23
Cyrillic%D0%... (UTF-8)

How to Use the Tool

1.

Paste text or a URL into the input field

2.

Select the mode: encode or decode

3.

Get the result instantly

4.

Copy the encoded URL

Encoding Modes

RFC 3986 Standard

Modern URL encoding follows the RFC 3986 standard, which defines the set of reserved and unreserved characters.

See also: Base64 Encoding, HTML Encoding, Unicode Lookup

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