On to or onto?
on to is a preposition meaning “Upon; on top of”; onto is a preposition meaning “Arriving upon or on top of (speaking of a physical or metaphorical movement)”. on to is written as two words and onto as one word; they are used differently.
What is the difference between on to and onto?
| on to | onto | |
|---|---|---|
| Part of speech | preposition | preposition, adjective, prefix |
| Meaning | Upon; on top of informalAware of | Arriving upon or on top of (speaking of a physical or metaphorical movement) informalAware of Attaining each of the values in its codomain; having its image equal to its codomain |
| Example | My cat just jumped on to the keyboard | My cat just jumped onto the keyboard |
| Forms | onto | none |
| Pronunciation | not recorded | /ˈɒn.tuː/ /ˈɑn.tu/ /ˈɔn.tu/ |
| In writing | not counted (the list counts single words) | 59 times per million words |
Sources: on to and onto in the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Every current meaning of on to and onto
on to
- 1
Upon; on top of
My cat just jumped on to the keyboard
- 2
informalAware of
The thought-police were on to my plans of world domination
- 3
Used to indicate, or signpost, logical progression to a new topic in a talk or discourse
Now. On to the system of active water uptake
onto
- 1
Arriving upon or on top of (speaking of a physical or metaphorical movement)
My cat just jumped onto the keyboard
- 2
Attaining each of the values in its codomain; having its image equal to its codomain
Considered as a function on the real numbers, the exponential function is not onto, as it never takes on values less than or equal to zero
- 3
being
- 4
informalAware of
The thought-police were onto my plans of world domination
- 5
Being an onto function with a codomain of (see below)
The exponential function maps the set of real numbers onto the set of positive real numbers
Source: the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); obsolete, archaic, dialect and rare senses left out.
Which is more common, on to or onto?
on to is a phrase, which the list of single words does not count; onto 59 times per million words.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How many people search on to vs onto?
“on to vs onto” is searched about 1,900 times a month on Google and 120 on Bing in the United States. Google counts close variants of a query together (“onto vs on to”, “on to or onto”).
Sources: Google Ads keyword data through DataForSEO and Microsoft Advertising keyword data through DataForSEO, the average month from September 2025 to August 2026.