Nettsiden er tilgjengelig for alle.

It can mean either, depending on context.

Literally, nettside is web page:

• nett = net/web/internet
• side = page

But in everyday Norwegian, many people also use nettside to mean website as a whole. In a sentence like Nettsiden er tilgjengelig for alle, English often translates it as The website is available to everyone.

Because Norwegian usually writes compound nouns as a single word.

So:

• nett
  • side → nettside

This is very normal in Norwegian. English is less consistent with compounds, but Norwegian strongly prefers joining them.

The ending -en is the definite article attached to the noun. Norwegian often puts the at the end of the word instead of using a separate word.

So:

• en nettside = a website / a web page
• nettsiden = the website / the web page

Yes, nettsida can also be correct in Bokmål. That is because side is traditionally a feminine noun:

• ei nettside = a website
• nettsida = the website

But Bokmål often allows feminine nouns to be treated like masculine nouns:

• en nettside
• nettsiden

Both forms are used. Nettsiden is very common.

Er means is.

It is the present tense of å være = to be.

So:

• Nettsiden er tilgjengelig = The website is available

Tilgjengelig means available or accessible.

In this sentence, it is an adjective describing nettsiden after the verb er.

You can also see it in other forms:

• en tilgjengelig nettside = an available/accessible website
• et tilgjengelig dokument = an available document
• tilgjengelige nettsider = available websites
• Nettsidene er tilgjengelige = The websites are available

So the basic form is tilgjengelig, but it can become tilgjengelige in the plural.

With tilgjengelig, Norwegian normally uses for to show who something is available or accessible to.

So:

• tilgjengelig for alle = available to everyone

Using til here would sound unnatural in standard Norwegian. Til usually points more toward direction, destination, or recipient, while for is the normal choice with this adjective.

Here it means everyone or all people.

Alle can mean:

• all
• everyone

In for alle, the idea is for everyone.

It follows normal Norwegian main-clause word order:

• Nettsiden = subject
• er = verb
• tilgjengelig for alle = rest of the sentence

So the pattern is basically: subject + verb + complement

Norwegian is a verb-second language, which means the finite verb usually comes early in the sentence and is typically in second position in main clauses.

A rough pronunciation is:

til-YENG-eh-li

A few helpful notes:

• gj here is often pronounced a bit like y
• the -lig ending is often pronounced more like -li in everyday speech
• pronunciation varies somewhat by dialect

So you may hear something close to til-yeng-eh-li.

It is capitalized only because it is the first word of the sentence.

In Norwegian, ordinary nouns are not capitalized the way they are in German. So in the middle of a sentence, you would normally write:

• nettsiden
• ikke Nettsiden