Tôi thu nhỏ hình.

Yes. Tôi is the standard, neutral way to say I in Vietnamese.

A few useful notes:

• It is polite and fairly safe in many situations.
• Vietnamese pronouns depend a lot on age, relationship, and social context, so people do not always use tôi in everyday speech.
• But in textbooks and neutral examples, tôi is very common.

So in this sentence, tôi simply means I.

Thu nhỏ is written as two words, but it functions together as a single verbal expression meaning to reduce, to shrink, or to make smaller.

You can think of it as:

• thu = to draw in, gather, reduce
• nhỏ = small

Together, thu nhỏ means make smaller.

In modern usage, it is very common for things like:

• shrinking an image
• zooming out
• reducing size in editing or design

Because Vietnamese often uses a main verb followed by another element that shows the result or direction of the action.

Here:

• thu gives the idea of reducing or drawing in
• nhỏ gives the resulting state: small

So thu nhỏ literally has the sense of reduce so that it becomes small.

This verb order is normal in Vietnamese. English speakers sometimes expect an adjective before a noun or a different order, but here thu nhỏ is a verb phrase, not a noun phrase.

Here, hình means something like image, picture, or photo, depending on context.

The word hình is quite broad. It can refer to:

• a picture
• a photo
• an image
• sometimes even a shape or form

So Tôi thu nhỏ hình most naturally means I shrink the image/picture.

If the context is a computer or phone screen, image is often the best translation.

Vietnamese does not use articles the same way English does.

English needs words like:

• a
• an
• the

Vietnamese usually does not.

So hình can mean:

• a picture
• the picture
• pictures in some contexts

The exact meaning depends on context.

If you want to be more specific, Vietnamese can add extra words, for example:

• một hình = one picture / a picture
• bức hình = a picture/photo
• hình này = this picture
• hình đó = that picture

Not necessarily. Hình by itself is possible, especially in short, practical, or technical contexts.

But yes, bức hình is also very natural when you are clearly talking about a photo or picture as a countable object.

Compare:

• Tôi thu nhỏ hình. = I shrink the image.
• Tôi thu nhỏ bức hình. = I shrink the picture/photo.

The version without a classifier can sound more general or more like software/interface language. The version with bức can sound a little more concrete, like an actual picture.

Yes, quite similar in this sentence.

The structure is:

• Tôi = subject
• thu nhỏ = verb
• hình = object

So it follows a basic Subject–Verb–Object pattern:

• I / shrink / the image

That is one reason this sentence is fairly easy for English speakers to understand.

Yes, it can be natural, especially in a context like editing, design, phones, or computers.

However, depending on context, native speakers might also say:

• Tôi thu nhỏ hình ảnh.
• Tôi thu nhỏ bức hình.
• Tôi làm cho hình nhỏ lại.

These are slightly different in tone or style:

• hình ảnh can sound a bit more formal or explicit
• bức hình clearly means a picture/photo
• làm cho... nhỏ lại is a more transparent make ... smaller structure

So your sentence is fine, but context affects which version sounds most natural.

A rough pronunciation guide is:

• Tôi ≈ toy
• thu ≈ too but shorter and with Vietnamese vowel quality
• nhỏ ≈ something like nyaw with the nh sounding like Spanish ñ
• hình ≈ roughly hinh with a short vowel and final nasal sound

Tones:

• tôi: level-ish tone with a slight glide in standard pronunciation
• thu: level tone
• nhỏ: hỏi tone, a dipping/curving tone in the North
• hình: huyền tone, low falling

If you are learning Northern Vietnamese, the tones matter a lot. In Southern Vietnamese, some tone distinctions are pronounced differently, but the sentence is still the same in writing.

Yes. Hình is a flexible word.

It can mean things like:

• picture
• image
• photo
• shape
• form

You know the intended meaning from context.

Because the verb is thu nhỏ (shrink / reduce in size), the most likely meaning here is:

• an image on a screen
• a picture
• a photo

If the context were geometry, hình might instead mean shape or figure.

Sometimes, yes. Vietnamese often drops subjects when they are already clear from context.

For example, in a conversation or while giving instructions, someone might simply say:

• Thu nhỏ hình.

That could mean:

• Shrink the image
• I’m shrinking the image
• (You) shrink the image

The exact meaning depends on context and intonation.

Including tôi makes it clearly I shrink the image.

Not always, but they can overlap.

Thu nhỏ literally means make smaller or reduce size.

Depending on context, it may mean:

• shrink the image itself
• reduce the displayed size
• zoom out

But zoom out is not always exactly the same as make smaller.

For example:

• In image editing, thu nhỏ hình may mean reducing the size of the image.
• In viewing software, it might function like zoom out.

So the best English translation depends on the situation, even though the core meaning is make the image smaller.