Έβαλες ερωτηματικό αντί για τελεία, αλλά δεν πειράζει.

Έβαλες is the 2nd person singular aorist of βάζω, which means to put, to place, or in context to use/type.

So Έβαλες ερωτηματικό means: You put/used a question mark.

The aorist is used because this is seen as a completed action: you already put the punctuation mark.

Greek often drops subject pronouns when they are not needed, because the verb ending already shows who the subject is.

• έβαλα = I put
• έβαλες = you put
• έβαλε = he/she/it put

So Έβαλες already means you put, and adding εσύ would usually only be for emphasis or contrast.

Ερωτηματικό means question mark.

A very important Greek-specific point: in standard Greek punctuation, the question mark is written as ; rather than ?.

So:

• Greek ; = English ?
• Greek ? is not the normal standard question mark in Greek writing

The noun ερωτηματικό still means question mark, regardless of the symbol shape used.

Τελεία usually means full stop / period in punctuation.

It can also mean dot in some contexts.

For example:

• βάλε τελεία = put a period
• μια τελεία = a dot

So in this sentence, τελεία clearly means the punctuation mark .

Αντί για means instead of.

So:

• ερωτηματικό αντί για τελεία = a question mark instead of a period

This is a very common structure in Modern Greek:

• αντί για καφέ, ήπια τσάι = instead of coffee, I drank tea
• αντί για λεωφορείο, πήρα ταξί = instead of the bus, I took a taxi

Greek often leaves out the article when talking about something in a general or indefinite way, especially in short practical statements like this one.

So:

• Έβαλες ερωτηματικό αντί για τελεία = You put a question mark instead of a period

You could also hear:

• Έβαλες ένα ερωτηματικό αντί για μια τελεία
• Έβαλες το ερωτηματικό αντί για την τελεία

But those versions sound a bit more specific or more explicit. The article-less version is very natural here.

Δεν πειράζει is a very common expression meaning:

• it doesn’t matter
• it’s okay
• never mind
• no problem

Literally, πειράζω can mean to bother, to affect, to disturb, or sometimes to tease depending on context. So δεν πειράζει has the basic idea of it doesn’t affect things in an important way.

In this sentence, αλλά δεν πειράζει means: but it doesn’t matter / but it’s okay.

This is an impersonal expression in Greek.

Δεν πειράζει works like English it doesn’t matter, where it does not refer to a specific concrete thing. Greek often uses the 3rd person singular for this kind of general statement.

So even though no explicit subject appears, the phrase is complete and natural:

• Δεν πειράζει. = It doesn’t matter.

Αλλά means but.

It connects the correction to a softening comment:

• Έβαλες ερωτηματικό αντί για τελεία = You put a question mark instead of a period
• αλλά δεν πειράζει = but it doesn’t matter

So the speaker is correcting something, but in a gentle way.

It sounds fairly mild and polite, especially because of αλλά δεν πειράζει.

Without that second part, the sentence would sound more like a direct correction:

• Έβαλες ερωτηματικό αντί για τελεία.

With αλλά δεν πειράζει, the speaker is saying: You made this small mistake, but it’s fine.

So the overall tone is reassuring rather than harsh.

Because the speaker is referring to something that has already happened: the other person already typed or wrote the wrong punctuation mark.

• Βάζεις ερωτηματικό... = You are putting / you put (habitually) a question mark...
• Έβαλες ερωτηματικό... = You put / you used a question mark...

The aorist έβαλες is the normal choice when talking about a single completed action.

Then you would use βάλατε instead of έβαλες.

So:

• Έβαλες ερωτηματικό αντί για τελεία, αλλά δεν πειράζει. = singular informal you
• Βάλατε ερωτηματικό αντί για τελεία, αλλά δεν πειράζει. = plural you or formal you

This is a very important Greek distinction:

• έβαλες = you singular informal
• βάλατε = you plural or polite/formal singular