Nagłówek na tej stronie jest zbyt duży.

Nagłówek usually means header, heading, or headline, depending on context.

In a website/interface sentence like this, nagłówek most naturally means a header or heading on the page.

It is not always the same as tytuł:

• tytuł = title
• nagłówek = header/heading/headline

So if you are talking about the main title of an article, tytuł may be better. If you mean a page heading or a visual header element, nagłówek is very natural.

Polish normally says na stronie for on the page or on the website/page.

So:

• na stronie = on the page
• na tej stronie = on this page

Using w tej stronie would sound unnatural in standard Polish for this meaning.

This is similar to how Polish often uses na with surfaces, pages, websites, and platforms:

• na stronie = on the page
• na Facebooku = on Facebook
• na zdjęciu = in the picture / on the picture

Because after na here, strona changes form.

The basic form is:

• ta strona = this page

But in the sentence, na requires the locative case when it means on in a static location:

• na tej stronie = on this page

So:

• nominative: ta strona
• locative: na tej stronie

That is why you see tej, not ta.

It is the locative case.

In this sentence, na means on in the sense of location, not movement. When na expresses location, Polish uses the locative:

• na tej stronie = on this page

Compare:

• na tę stronę = onto this page / to this page direction or movement
• na tej stronie = on this page location

So here there is no movement. The header is located on the page, so Polish uses the locative.

In the present tense, Polish usually uses jest = is in sentences like this:

• Nagłówek ... jest zbyt duży. = The header is too big.

Unlike Russian, for example, Polish normally does not omit the present-tense to be in standard sentences of this kind.

So:

• Nagłówek jest duży = correct
• Nagłówek duży = not standard in normal neutral Polish

Both can mean too big, but there is a nuance:

• zbyt duży = too big, often a bit more formal or neutral
• za duży = too big, very common in everyday speech

So your sentence:

• Nagłówek na tej stronie jest zbyt duży.

is perfectly correct and sounds a little more formal or written.

A more conversational version would often be:

• Nagłówek na tej stronie jest za duży.

Both are natural.

Because duży has to agree with nagłówek.

Nagłówek is a masculine singular noun, so the adjective must also be masculine singular:

• duży nagłówek = a big header

Compare:

• duża strona = a big page feminine
• duże okno = a big window neuter
• duży nagłówek = a big header masculine

In predicate position, after jest, the adjective still agrees with the noun:

• Nagłówek jest duży.

A good first clue is the dictionary form ending.

Many Polish nouns ending in a consonant are masculine, and nagłówek ends in a consonant sound.

So:

• nagłówek → probably masculine

You can also confirm it by agreement:

• ten nagłówek = this header masculine
• duży nagłówek = big header masculine

That said, there are exceptions in Polish, so the ending is a useful clue, not an absolute rule.

Yes. Polish word order is fairly flexible.

The neutral order here is:

• Nagłówek na tej stronie jest zbyt duży.

But you could also say:

• Na tej stronie nagłówek jest zbyt duży.

This puts a little more focus on on this page.

You could even say:

• Zbyt duży jest nagłówek na tej stronie.

But that sounds more marked or stylistic.

So the original sentence is the most natural neutral version.

A rough pronunciation guide is:

• na-gWOH-vek

A few important points:

• ł sounds like English w
• ó sounds like u
• stress in Polish is usually on the second-to-last syllable, so here it falls on łó

So nagłówek is approximately:

• na-GWOO-vek or na-GWOH-vek

depending on how you represent the vowel for learners.

Approximate pronunciation:

• duży ≈ DOO-zhih
• tej stronie ≈ tay STRO-nyeh

Helpful details:

• ż sounds like the s in measure
• j in tej sounds like English y
• ie in stronie is pronounced, not silent

So:

• duży = DOO-zhih
• tej stronie = tay STRO-nyeh

Yes, absolutely.

• Ta strona ma zbyt duży nagłówek. = This page has too big a header.

That sentence is also natural, but the structure is different:

• Nagłówek na tej stronie jest zbyt duży. focuses on the header
• Ta strona ma zbyt duży nagłówek. focuses more on the page as the thing that has the header

Both are correct. The original sentence is slightly more direct if the header itself is the topic.

It sounds neutral to slightly formal, mainly because of zbyt.

• jest zbyt duży = neutral/written/slightly formal
• jest za duży = more everyday conversational

So if this appeared in feedback, UX review, editing notes, or written comments, it would sound very natural.

In casual speech, many people would more often say:

• Nagłówek na tej stronie jest za duży.