Stavekontrollen fandt ikke alle mine tastfejl, så jeg retter teksten langsomt selv.

Stavekontrollen means the spell-checker or the spell check.

In Danish, the definite article is usually added to the end of the noun:

• en stavekontrol = a spell-checker / a spell check
• stavekontrollen = the spell-checker / the spell check

So the -en ending is the Danish way of saying the.

Danish very often forms compound nouns by writing them as a single word.

Here:

• tast = key / keystroke
• fejl = mistake / error
• tastfejl = typing error / typo

This is extremely common in Danish. English often separates these words or uses a phrase, but Danish usually joins them.

Other examples:

• stavemåde = spelling
• arbejdsdag = workday
• sommerferie = summer holiday

In Danish, alle normally comes before possessives like min, mit, mine.

So the natural order is:

• alle mine tastfejl = all my typos

Not:

• mine alle tastfejl ❌

A few similar examples:

• alle mine bøger = all my books
• alle deres børn = all their children

In a main clause, Danish usually places the finite verb in second position, and ikke often comes after that verb.

So:

• Stavekontrollen fandt ikke alle mine tastfejl

Structure:

• subject: Stavekontrollen
• finite verb: fandt
• negation: ikke

This is a very common Danish pattern in main clauses:

• Jeg kommer ikke i morgen = I am not coming tomorrow
• Han forstår ikke spørgsmålet = He does not understand the question

Fandt is the past tense of finde:

• finde = to find
• finder = find / finds
• fandt = found
• har fundet = have/has found

So:

• Stavekontrollen fandt ikke ... = The spell-checker did not find ...

This is an irregular verb, so learners usually need to memorize it.

Danish often uses the present tense when talking about what someone is doing now or what they do as a result of something.

Here the sentence means something like:

• The spell-checker didn’t find all my typos, so I am correcting the text slowly myself

So retter is present tense:

• rette = to correct
• retter = correct / am correcting

It sounds natural in Danish because the speaker is describing their current action or response.

Here så means so, connecting two main clauses.

After this kind of så, Danish normally keeps ordinary main-clause word order:

• så jeg retter teksten ... = so I correct / am correcting the text ...

So this is correct:

• ..., så jeg retter teksten langsomt selv.

If you wrote så retter jeg ..., that would sound like then I correct ..., where så functions more like then or an adverb placed first, causing inversion.

Compare:

• Jeg var træt, så jeg gik hjem. = I was tired, so I went home.
• Så gik jeg hjem. = Then I went home.

Here selv means myself or personally.

So:

• jeg retter teksten langsomt selv = I correct the text slowly myself

It emphasizes that the speaker is doing it personally, instead of relying on the spell-checker.

Putting selv near the end is very natural in Danish when it adds emphasis:

• Jeg gjorde det selv = I did it myself
• Hun skrev brevet selv = She wrote the letter herself

Teksten means the text.

Again, Danish usually adds definiteness as an ending:

• en tekst = a text
• teksten = the text

The definite form is used because the speaker is referring to a specific text they are working on.

Langsomt is an adverb meaning slowly.

In this sentence it comes after the object:

• jeg retter teksten langsomt selv

That is a natural placement, especially when the speaker wants the focus to be on how they are correcting it.

You may see adverbs in different positions in Danish, but this version sounds very normal.

Compare:

• Jeg læser bogen langsomt. = I read/am reading the book slowly.
• Hun skrev svaret hurtigt. = She wrote the answer quickly.

It can mean either, depending on context.

Stavekontrollen can refer to:

• the spell-check feature in a program
• the spell-check system/tool generally

In this sentence, it most naturally refers to the spell-check function of some software.

Not in exactly the same way.

• Stavekontrollen fandt ikke ... = The spell-checker / the spell-check did not find ...
• Stavekontrol fandt ikke ... sounds incomplete or unnatural in this sentence

If you wanted an indefinite meaning, you would normally say:

• En stavekontrol fandt ikke ... = A spell-checker did not find ...

But since the speaker is probably talking about the specific spell-check tool they used, stavekontrollen is the natural choice.