فيه فرق كبير.

Here فيه means there is / there are.

So فيه فرق كبير literally works like:

• فيه = there is / there are
• فرق = difference
• كبير = big

A very natural English rendering is There’s a big difference.

One thing that confuses learners: فيه can also look like in him / in it in other contexts, because the spelling is the same. Here, though, it is the common Egyptian existential word meaning there is/are.

In Arabic, the present tense often does not use a separate verb like English is/are in simple statements.

So instead of saying something like there is a difference with a verb is, Egyptian Arabic commonly uses فيه as an existential expression.

That means فيه فرق كبير is a complete natural sentence even though there is no separate word corresponding exactly to English is.

A common Egyptian pronunciation is:

fīh farʔ kebīr

A few useful notes:

• فيه = fīh
• فرق is often pronounced farʔ in Egyptian, because ق is commonly pronounced as a glottal stop ʔ
• كبير is commonly pronounced kebīr in Egyptian speech

So it may sound roughly like:

feeh far’ kebeer

Because Egyptian Arabic often pronounces ق as a glottal stop ʔ rather than a hard q sound.

So:

• فرق in Modern Standard Arabic is farq
• in Egyptian Arabic it is usually farʔ

This is one of the most noticeable pronunciation differences between Egyptian Arabic and Standard Arabic.

Because in Arabic, adjectives usually come after the noun they describe.

So:

• فرق = difference
• كبير = big

Together:

• فرق كبير = a big difference

This is the normal noun + adjective order in Arabic.

Because فرق is a masculine singular noun, so the adjective must match it.

Agreement in Arabic usually means the adjective follows the noun in:

• gender
• number
• definiteness

So here:

• فرق = masculine singular
• كبير = masculine singular

That is why كبير is correct.

Because the sentence means a big difference, not the big difference.

In Arabic:

• فرق = a difference
• الفرق = the difference

So:

• فيه فرق كبير = There is a big difference
• فيه الفرق الكبير would mean something more like the big difference is there, which is not the intended meaning here

Indefinite nouns in Arabic do not need a separate word like English a/an.

This sentence is very natural in Egyptian Arabic.

In Modern Standard Arabic, you are more likely to see something like:

• هناك فرق كبير
• يوجد فرق كبير

Egyptian Arabic commonly uses فيه for there is/there are, so فيه فرق كبير sounds very normal in speech.

Yes. In Egyptian Arabic, فيه is commonly used for both singular and plural existence.

So:

• فيه فرق كبير = There is a big difference
• فيه فروق كبيرة = There are big differences

English changes from is to are, but Egyptian فيه often stays the same.

A very common Egyptian negative form is:

مفيش فرق كبير

This means:

There isn’t a big difference

You may also see it explained as:

• فيه = there is
• مفيش = there isn’t / there isn’t any

This is a very useful pattern in Egyptian Arabic.

In informal writing, spelling can vary a bit, but فيه is very common.

Learners should know that colloquial Arabic spelling online is often less standardized than Standard Arabic spelling. So you may see slight variation in how people write dialect, but فيه فرق كبير is a very normal and recognizable way to write this sentence.

It sounds natural and conversational.

It is the kind of sentence you would hear in everyday Egyptian speech. It is not slang, but it is clearly more colloquial than a formal Standard Arabic sentence like هناك فرق كبير or يوجد فرق كبير.

Not in this context.

Even though فيه can resemble a phrase meaning in him / in it depending on context, here native speakers understand it as the existential there is.

So the intended reading is definitely:

There is a big difference

not

In it, a big difference.

Context usually makes this completely clear.