karaasanpuru wo kuraberu.

を marks the direct object of the verb.

So in カラーサンプルを比べる, the thing being compared is カラーサンプル.

• カラーサンプル = color sample(s)
• を = object marker
• 比べる = to compare

A very literal breakdown is:

• color samples + object marker + compare

Because Japanese usually puts the verb at the end of the sentence.

English: Compare color samples.
Japanese: カラーサンプルを比べる。

This is a very common Japanese word order:

• object + を + verb

So this sentence follows a basic pattern:

• 何をする
• What do (you) do?

Here:

• カラーサンプルを = color samples
• 比べる = compare

比べる is the dictionary form, also called the plain form.

It can mean different things depending on context, such as:

• to compare
• compare
• will compare
• compares

Japanese non-past plain form does not always map to just one English tense.

In a short standalone sentence like this, it could sound like:

• a neutral statement: (Someone) compares color samples
• a heading or label: Compare color samples
• a description of an action: to compare color samples

It is read くらべる.

So the full sentence is read:

カラーサンプルをくらべる。

You may also want to notice that:

• 比 is the kanji
• べる is written in hiragana

This is very common in Japanese verbs.

Because カラーサンプル is a loanword-style expression, based on English color sample.

Katakana is commonly used for:

• foreign loanwords
• technical or industry terms
• product/design vocabulary
• words used for a modern or commercial feel

In contexts like printing, design, paint, fabric, or manufacturing, カラーサンプル sounds very natural.

A more native-Japanese-style expression might be something like:

• 色見本（いろみほん） = color sample / color chart / swatch

But カラーサンプル is perfectly normal in many real-world settings.

It can mean either one or more, depending on context.

Japanese often does not mark plural the way English does. So:

• カラーサンプル can mean a color sample
• or color samples

If the meaning shown to the learner is color samples, that is a very natural interpretation.

Context usually makes the number clear.

Because Japanese often omits the subject when it is obvious from context.

So instead of saying:

• I compare color samples
• We compare color samples
• Please compare color samples

Japanese may simply say:

カラーサンプルを比べる。

Who is doing the action is often understood from the situation.

This is one of the biggest differences from English: Japanese frequently leaves out information that English normally requires.

In modern Japanese, the particle を is usually pronounced o, even though it is written with the character を.

So:

• written: を
• pronounced: お

That means カラーサンプルを比べる sounds like:

karā sanpuru o kuraberu

Not usually. Standard Japanese writing normally does not use spaces between words.

So this would normally be written as:

カラーサンプルを比べる。

Spaces are sometimes added in teaching materials to make sentences easier for learners to read, but they are not standard in normal Japanese text.

Yes. 比べる is often used in patterns that include と when you explicitly say what is being compared with what.

For example:

• AとBを比べる = compare A and B
• AをBと比べる = compare A with B

In your sentence, カラーサンプルを比べる, the idea is simply compare the color samples as a group, so と is not necessary.

Yes. Depending on context, you might also see:

• 色見本を比べる = compare color samples / color swatches
• 見本を比べる = compare samples
• 色を比べる = compare colors

The best choice depends on what exactly is being compared:

• the physical sample cards or swatches → カラーサンプル / 色見本
• the colors themselves → 色

So カラーサンプルを比べる is especially natural when talking about actual sample materials or design samples.