Internet addresses are barely case sensitive for all names. For example, it doesn’t matter if you use uppercase or lowercase letters with “,” it will still reach a specific page. However, once you type the page name, file, or directory in the address, it’s case sensitive. So does capitalization and spaces matter in Internet addresses?

It is shocking for many people when they learn that URLs are case sensitive (unlike the real domain name). In a nutshell, while it does not really matter how your domain name can spell ( or or, it makes a huge difference in how you spell your URLs (domain or domain name). com / Page12).


The use of capital letters is the writing of a word with its first letter in capital letters and the remaining letters in lowercase letters. Experienced writers are stingy with capital letters. It is better not to use them if there is any doubt.

Capitalization in internet name

When typing an Internet address, uppercase letters may be important. Internet addresses are only case sensitive for everything after a domain name. For example, it doesn’t matter if you use uppercase or lowercase letters with “,” still reaching the same page. However, when typing the name of a page, file, or directory in the URL, it is case sensitive.


No spaces are allowed in any internet address. Therefore, never use spaces when typing in one direction. If you need to create a URL or an address with spaces, replace the spaces with a + (more). If not, the browser will automatically encode space to a value of %20 when entered through the address bar.

Spaces in internet address

Does the URL contain white space?

URLs with white space characters are not recommended, as they could cause problems when site visitors share or link to the URL, which could lead to broken links and loss of potential link equity.

The white space characters in the URLs act as insecure, so most modern CMS platforms will not generate URLs with blanks.

Should URLs all be lowercase?

If you are not sure whether the page or directory is uppercase or lowercase, always use lowercase letters. Most pages on the Internet will use all lowercase letters. If you create a webpage, we recommend that all file names be lowercase.

URL cannot contain literal space. In some cases, additional white spaces (spaces, line breaks, tabs, etc.) can be added to break the long URL across the line. Spaces are ignored when URIs are extracted.

Does Email addresses are case sensitive?

Each email address has two parts separated by an @ sign – the user name and domain where the email account was created. Both parties usually contain upper and lower case letters and may contain numbers, underscores, or periods. It’s easy to make mistakes when typing an email address, and it’s important to use the right lowercase and uppercase letters.

For example [email protected]/[email protected]

Technically this is a different email address, however, you might be fine.

The domain section of the email address ( is not case sensitive. So “” is the same as “”. However, recipients (local parts) have the potential to be case sensitive, so “Hello” is different from “Hello”. Because of this, real-world mail servers tend not to enforce this (I have never found one that did it) – because it is only confusing and tends to user error. If you keep your e-mail address, you may need to save it in the original case (at least the recipient) to be safe. However, always compare them with small letters to avoid duplicates.