Komm bitte herein.

Komm is the imperative form, used to give a command or invitation to one person you address as du.

So:

• du kommst = you come / you are coming
• Komm! = Come!

In German, the du-imperative is often formed from the verb stem:

• kommen → stem komm- → Komm!

That is why the sentence is Komm bitte herein.

It is the informal singular imperative.

German has different command forms depending on who you are speaking to:

• Komm bitte herein. → to one person, informal (du)
• Kommt bitte herein. → to more than one person, informal (ihr)
• Kommen Sie bitte herein. → formal (Sie)

So this sentence would be used with a friend, child, family member, classmate, etc.

Yes, here bitte means please and makes the command sound more polite or friendly.

Compare:

• Komm herein. → Come in.
• Komm bitte herein. → Please come in.

In German, bitte is extremely common and useful. It can also mean things like you’re welcome, here you go, or be used in requests, but in this sentence it simply softens the imperative.

Herein means something like in here or into here, with motion toward the speaker.

It is built from:

• her- = movement toward the speaker
• ein / hinein / herein = inward, inside

So herein is more specific than just in.

Compare:

• Komm herein. → come in / come in here
• Geh hinein. → go in / go inside

German often distinguishes between movement toward the speaker (her-) and movement away from the speaker (hin-).

These are related, but they differ in style and nuance.

1. herein

Used for motion toward the speaker:

• Komm herein. = come in (toward me / into this place)

2. hinein

Used more for movement away from the speaker or just into something:

• Geh hinein. = go inside

3. rein

This is a shorter, more colloquial form of herein/hinein in many contexts:

• Komm rein. = come in

In everyday spoken German, Komm rein is often more common than Komm herein.
Herein can sound a bit more careful, clear, or slightly more formal.

Because in German, separable directional elements and particles often appear later in the clause, and imperatives commonly place the verb first and other elements after it.

So:

• Komm = imperative verb
• bitte = polite particle
• herein = direction

This order is very natural:

• Komm bitte herein.

You may also hear:

• Bitte komm herein.
• Komm herein, bitte.

All are possible, but Komm bitte herein is very standard.

Yes, it is natural and correct. But in everyday speech, many native speakers would very often say:

• Komm bitte rein.
• Komm rein.
• Bitte komm rein.

So herein is not wrong at all; it just sounds a little more explicit or slightly less casual than rein in many situations.

If you are learning standard German, Komm bitte herein is a perfectly good sentence.

Yes. Bitte is flexible.

Common options:

• Komm bitte herein.
• Bitte komm herein.
• Komm herein, bitte.

They all mean basically the same thing, but the feel is slightly different:

• Bitte komm herein. can sound a bit more like a polite invitation
• Komm bitte herein. is very neutral and common
• Komm herein, bitte. may sound slightly more marked depending on context

For learners, Komm bitte herein is an excellent default pattern.

Because it is the first word of the sentence.

In German, verbs are not normally capitalized just because they are verbs. They are capitalized here only because the sentence begins with Komm.

Compare:

• Komm bitte herein.
• Ich komme gleich.

Only the first word and nouns are regularly capitalized.

A simple guide:

• Komm → sounds roughly like kom
• bitte → roughly BIT-uh
• herein → roughly heh-RINE

A more helpful breakdown:

• Komm = short o, not like English comb
• bitte = two syllables: BIT-te
• herein has stress on the second syllable: he-REIN

If spoken naturally, it may sound a bit like:

Komm bitte herein.
→ kom BIT-te heh-RINE

Yes. Both punctuation marks are possible.

• Komm bitte herein. → neutral, calm, polite
• Komm bitte herein! → stronger, more direct, more clearly an invitation/command

In modern German, people often use a period even with imperatives if they want a softer tone. So the version with a full stop is completely normal.

The formal version is:

• Kommen Sie bitte herein.

This is what you would say to:

• a stranger
• a customer
• a patient
• a teacher or other person you address as Sie

Compare:

• Komm bitte herein. → informal, one person
• Kommen Sie bitte herein. → formal

So the original sentence tells you immediately that the speaker is addressing someone informally.

Yes, absolutely. German imperatives are not always harsh commands.

Komm bitte herein. can sound like:

• a friendly invitation
• welcoming someone at the door
• asking someone to enter a room

Tone of voice matters a lot. With a warm tone, it can feel very close to:

• Please come in
• Do come in

So even though it is grammatically an imperative, it is often socially just an invitation.