Das Kleingedruckte steht unten.

Because it is being used as a noun.

In German, words that are originally adjectives or participles can be turned into nouns. When that happens, they are capitalized. So:

• kleingedruckt = printed in small type
• das Kleingedruckte = the fine print / the small print

This is called a nominalized adjective/participle.

The article is das because this nominalized form is treated as neuter singular when it refers to something abstract or general, like a category of text.

So das Kleingedruckte does not mean one specific neuter object in a physical sense; it means something like:

• the fine print
• the small print
• what is printed in small letters

This neuter singular pattern is very common in German with nominalized adjectives, for example:

• das Gute = the good
• das Neue = the new thing / what is new
• das Wichtigste = the most important thing

It comes from:

• klein = small
• gedruckt = printed

So literally, it is something like that which is printed small.

Over time, this became the standard German word for fine print or small print, especially in contracts, ads, and legal text.

Because it is a nominalized adjective/participle with a definite article: das.

In das Kleingedruckte, the word takes the adjective ending you would expect after das. This is the weak adjective ending:

• das Kleingedruckte

Compare:

• das gute Essen
• das Alte
• das Bekannte

So even though it functions like a noun, it still keeps adjective-style endings.

It is in the nominative case because it is the subject of the sentence.

You can tell because it is the thing doing the grammatical action in the sentence:

• Das Kleingedruckte steht unten.

Also, the verb is steht, which is 3rd person singular, matching the singular subject das Kleingedruckte.

This is very natural in German.

stehen often means not just to stand, but also to be located or to appear written somewhere, especially with text. So German can say:

• Das steht unten. = That is written at the bottom.
• Was steht da? = What does that say? / What is written there?

So in this sentence, steht means something like:

• is written
• appears
• is located

not literally stands upright.

Unten means down below or at the bottom.

In this sentence, it tells you where the fine print is located:

• unten = below / at the bottom

It is an adverb of place.

Depending on context, English might translate it as:

• at the bottom
• below
• down below

Because unten can work by itself as an adverb.

German often uses simple location adverbs without a preposition, for example:

• oben = at the top / above
• unten = at the bottom / below
• links = on the left
• rechts = on the right

So Das Kleingedruckte steht unten is perfectly natural.

If you want to be more specific, you could add more information:

• Das Kleingedruckte steht unten auf der Seite. = The fine print is at the bottom of the page.

This is the normal German word order for a simple statement:

1. subject
2. verb
3. other information

So:

• Das Kleingedruckte = subject
• steht = verb
• unten = place adverb

German main clauses usually keep the conjugated verb in second position. That is the key rule here.

Yes. That is also correct.

German allows different elements to come first for emphasis, as long as the conjugated verb stays in second position:

• Das Kleingedruckte steht unten.
• Unten steht das Kleingedruckte.

The second version emphasizes where it is.

Yes, very common.

It is the normal way to say the fine print or small print, especially in contexts like:

• contracts
• insurance
• advertisements
• terms and conditions

You will often see or hear things like:

• Lies auch das Kleingedruckte. = Read the fine print too.
• Im Kleingedruckten steht, dass ... = In the fine print, it says that ...

It can mean either, depending on context.

Unten can refer to:

• the lower part of a page or document
• downstairs
• a lower physical location
• below in a visual layout

In this sentence, because the subject is das Kleingedruckte, the most natural interpretation is at the bottom of the page/document/screen.

A more explicit version could be:

• Das Kleingedruckte steht unten auf der Seite.
• Das Kleingedruckte steht am unteren Rand.
• Das Kleingedruckte ist unten zu finden.

But the short original sentence is very natural and idiomatic. It sounds concise and clear.