'How can I remove the file extension in the website url?

So, I've already tried to use the .htaccess code, that I'll put down here, but it doesn't work. Can someone help me please?

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.*)$ $1.html
phphtmlcss


Solution 1:[1]

RewriteEngine on
RewriteCond %{THE_REQUEST} /([^.]+)\.html [NC]
RewriteRule ^ /%1 [NC,L,R]
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^ %{REQUEST_URI}.html [NC,L]

Sources

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Source: Stack Overflow

Solution Source
Solution 1 tntzx

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