Allego tutta la documentazione.

Allego is the 1st person singular present indicative of allegare, which means to attach or to enclose.

So allego = I attach / I am attaching.

In Italian, the simple present often covers both:

• I attach
• I’m attaching

In this kind of sentence, it is very common in emails, letters, and formal messages.

Italian often omits subject pronouns when they are clear from the verb ending.

• allego already tells you the subject is I
• so io allego is possible, but usually unnecessary

Using io would add emphasis, as if you were saying:

• I am attaching it

But in a normal email, Allego tutta la documentazione sounds natural and standard.

Tutta means all or the whole of.

It agrees with la documentazione, which is:

• feminine
• singular

So:

• tutto = masculine singular
• tutta = feminine singular
• tutti = masculine plural
• tutte = feminine plural

Because documentazione is feminine singular, Italian uses tutta.

In Italian, when tutto means all the / the whole, it usually comes with the definite article.

So:

• tutta la documentazione = all the documentation

This is the normal structure:

• tutto il giorno = all day
• tutta la settimana = all week
• tutti i documenti = all the documents
• tutte le pagine = all the pages

Without the article, the meaning or structure would be different and usually unnatural here.

Italian documentazione is often a collective or mass noun, like documentation in English.

So even if it refers to many papers or files, Italian treats it as a singular noun:

• la documentazione

That is why the sentence uses:

• tutta la documentazione not
• tutte le documentazioni in normal usage

English learners sometimes expect a plural like documents, but Italian often prefers the singular collective noun here.

Yes, absolutely.

There is a slight difference in nuance:

• Allego tutta la documentazione = I attach all the documentation / all the paperwork
• Allego tutti i documenti = I attach all the documents

Documentazione sounds a bit more:

• formal
• administrative
• collective

Documenti sounds more like individual documents.

Both are correct, but documentazione is especially common in formal or bureaucratic contexts.

Yes, it sounds neutral to formal, and it is very common in:

• emails
• cover letters
• business communication
• administrative messages

For example, you might write:

• Allego tutta la documentazione richiesta.
• Allego la documentazione necessaria.

It is not overly stiff, but it definitely sounds more formal than everyday spoken Italian.

No. Allegare can mean to attach in several formal contexts, especially when talking about:

• email attachments
• enclosed documents
• forms sent together with a request
• supporting paperwork

So it can mean:

• attached digitally
• enclosed physically with a letter or application

That is why it is a very useful verb in professional Italian.

It often appears with extra context, for example:

• Allego tutta la documentazione richiesta.
• Allego tutta la documentazione necessaria.
• In allegato troverà tutta la documentazione.
• Le allego tutta la documentazione.

These are all common in formal writing.

The original sentence is already complete, but in real communication it is often expanded slightly.

Le allego tutta la documentazione includes the indirect object pronoun Le, meaning to you in a formal sense.

So:

• Allego tutta la documentazione = I attach all the documentation
• Le allego tutta la documentazione = I attach all the documentation for you / I am attaching all the documentation to you

The version with Le is especially common in polite business Italian.

The natural stress is:

• allégo
• documentazióne

So approximately:

• ah-LEH-go
• do-koo-men-ta-tsyo-NEH

That stress pattern is important for sounding natural.

In many real email situations, yes, English may translate it that way.

Grammatically, allego is present tense, so literally it is:

• I attach or
• I am attaching

But in English, when sending an email, people often naturally say:

• I’ve attached all the documentation

So the best translation depends on context and natural usage, not just tense matching word for word.