invsitsWhat's the difference?

Quick tell: in is a preposition, its is a determiner, so they fill different roles in a sentence.

Which to use

“in” is a preposition and “its” is a determiner - they look or sound alike but fill different roles in a sentence.

#6
“in” frequency rank
#75
“its” frequency rank
81
confusion score

Side-by-Side Comparison

Feature in its
Definition Used to indicate location, inclusion, or position within spatial, temporal or abstract limits. Belonging to it.

Where the eye mixes in and its

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

2 ch
in
3 ch
its

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: in is /ən/ while its is /ɪts/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (preposition vs determiner), which is usually the fastest check. Our composite confusion score for this pair is 81, derived from the frequency rank of both members and their visual similarity.

in is recorded at frequency rank #6, classified as aprep, pronounced /ən/. its is at rank #75, tagged as adet, pronounced /ɪts/.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 81, this pair ranks #529,921 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of in vs its

Shared letters: i. Private to "in": n. Private to "its": st.

"in" · 2 letters · shape VC  ·  "its" · 3 letters · shape VCC

Frequently Asked Questions

Can "in" and "its" be used interchangeably?
No - they are not even the same part of speech. "in" is a preposition and "its" a determiner, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "in" or "its"?
"in" is the more common of the two: it sits at frequency rank #6 in our English list, against #75 for "its". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list