Hun tog et skærmbillede af referatet og lagde det i en mappe, hvilket var lettere end at skrive det hele igen.

Yes. Et skærmbillede is the standard Danish word for a screenshot.

It is a compound noun:

• skærm = screen
• billede = picture/image

So literally it means screen picture.

You may also see screenshot in informal tech Danish, but skærmbillede is the normal native Danish word.

Because skærmbillede is a neuter noun in Danish, so it takes et.

In Danish, nouns are either:

• common gender: take en
• neuter gender: take et

So:

• et skærmbillede
• skærmbilledet = the screenshot

A useful clue is that the last part of the compound is billede, and et billede is neuter. In Danish compounds, the final element usually determines the gender.

Because referatet is the definite form: the report/the minutes/the summary.

Compare:

• et referat = a summary / a set of minutes
• referatet = the summary / the minutes

Danish often adds the definite article to the end of the noun instead of using a separate word like English the.

So:

• et referat
• referatet

In this sentence, referat most likely means minutes, a written summary, or a report of what was said.

Depending on context, et referat can mean:

• meeting minutes
• a summary
• a written account

So et skærmbillede af referatet means a screenshot of that written summary/minutes.

Because Danish normally uses af after skærmbillede to mean of.

So:

• et billede af noget = a picture of something
• et skærmbillede af noget = a screenshot of something

Here:

• af referatet = of the summary/minutes

This is very natural Danish.

Because the sentence describes completed actions in the past:

• Hun tog = she took
• (hun) lagde = she put/placed

These are the past tense forms of:

• at tage → tog
• at lægge → lagde

Both verbs are common, and tage is irregular.

So the sentence narrates a sequence:

1. She took a screenshot.
2. She put it in a folder.

Because Danish, like English, often leaves out the second subject when the same subject continues across coordinated verbs.

So:

• Hun tog et skærmbillede ... og lagde det i en mappe

means:

• She took a screenshot ... and put it in a folder

You could say og hun lagde det i en mappe, but it is less economical and usually unnecessary unless you want extra emphasis or clarity.

This is a very common Danish learner question.

• at lægge = to lay / put / place something
• at ligge = to lie / be lying

So:

• Hun lagde det i en mappe = She put it in a folder
• Det lå i en mappe = It was lying in a folder

A quick rule:

• lægge usually takes an object: you put something somewhere
• ligge describes position/state: something is lying somewhere

Here she actively places the screenshot into the folder, so lagde is correct.

Here det refers to et skærmbillede.

Because skærmbillede is neuter (et-word), the pronoun is det.

So:

• et skærmbillede
• det

This is pronoun agreement by grammatical gender.

Here det means it, but in a broader sense: the whole thing, meaning the content of the summary/minutes.

The expression det hele means:

• all of it
• the whole thing

So at skrive det hele igen means:

• to write the whole thing again
• to rewrite it all

Even though det is the same word as earlier, it does not have to point to exactly the same physical object. Here it refers more naturally to the text/content that would have to be written again.

Here hvilket means which, but it refers to the whole previous idea, not just one noun.

So:

• Hun tog et skærmbillede af referatet og lagde det i en mappe, hvilket var lettere ...

means:

• She took a screenshot of the summary and put it in a folder, which was easier ...

In other words, hvilket refers to the entire action/situation: taking the screenshot and saving it.

Because hvilket is the natural choice when the relative word refers to an entire clause or situation, not just a single noun.

Compare:

• Bogen, som jeg læste = the book that I read
  Here som refers to bogen

• Han kom for sent, hvilket irriterede mig = He arrived late, which annoyed me
  Here hvilket refers to the whole fact that he arrived late

In your sentence, hvilket refers to the whole previous action, so hvilket is the better choice.

Because Danish uses commas to mark subordinate clauses, and hvilket var lettere end at skrive det hele igen is a subordinate relative clause.

So the comma helps show:

• main clause: Hun tog et skærmbillede af referatet og lagde det i en mappe
• subordinate comment: hvilket var lettere end at skrive det hele igen

This is normal Danish punctuation.

Yes, at is natural here because skrive is an infinitive.

• lettere = easier
• end = than
• at skrive = to write

So:

• lettere end at skrive det hele igen = easier than writing it all again / easier than to write it all again

In idiomatic English we usually say easier than writing it all again, but Danish commonly uses end at + infinitive in this kind of structure.

Det hele is a very common expression meaning:

• the whole thing
• all of it
• everything

Examples:

• Jeg forstod det hele. = I understood all of it.
• Hun måtte gøre det hele igen. = She had to do the whole thing again.

So in your sentence, skrive det hele igen means rewriting the entire content.

Igen means again.

In skrive det hele igen, it means:

• write it all again
• rewrite the whole thing

Putting igen at the end is very natural in Danish. Danish often places adverbs like this after the object or near the end of the phrase.

So:

• at skrive det hele igen sounds completely normal.

It can mean either, depending on context.

• en mappe = a folder

That could be:

• a physical folder
• a digital folder on a computer or phone

In this sentence, because it involves a screenshot, many readers will imagine a digital folder, but the word itself can be used for both.