onto
on·to/ˈɒn.tuː/preposition, adjective
onto is spelled O-N-T-O: 4 letters and 2 syllables (on·to). It appears 59 times per million words in written English, the 1,758th most frequent word form (wordfreq, 2021 data). People search “on to vs onto” about 1,900 times a month (Google, United States). As a preposition, onto means “Arriving upon or on top of (speaking of a physical or metaphorical movement)” (English Wiktionary, September 2026).
How many letters and syllables are in onto?
| Letters | 4: O-N-T-O |
|---|---|
| Syllables | 2: on·to |
| In writing | 59 times per million words; the 1,758th most frequent word form |
| Wrong spellings searched | none measured in search |
| Pairs people search | |
| Same letters |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is onto?
Onto appears 59 times per million words in written English, the 1,758th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce onto?
- UK /ˈɒn.tuː/
- /ˈɑn.tu/
- /ˈɔn.tu/
Onto has 2 syllables, split on·to in writing.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-onto.wav, LL-Q1860_(eng)-Wodencafe-onto.wav, Wikimedia Commons (author and licence on each file's page).
Words people confuse with onto
Word pairs people search, with the monthly searches for “a vs b” (G: Google, B: Bing, United States).
Also written: on to (one word or two).
Sources: Google and Bing searches (September 2025 to August 2026, through DataForSEO); English Wiktionary (homophones, alternative spellings).
What rhymes with onto?
No other word on PlainSpell ends in the same sounds as onto (/ɒntu/).
Spelled with the same letters in another order: toon.
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of onto
- on to
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does onto mean?
The meanings the English Wiktionary records, quoted as written there (source below).
preposition
- 1
Arriving upon or on top of (speaking of a physical or metaphorical movement).
My cat just jumped onto the keyboard.
- 2
informalAware of.
The thought-police were onto my plans of world domination.
- 3
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.
adjective
- 1
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.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Onto in Spanish, French, German and Portuguese
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does onto come from?
From on + to, after into. Compare Saterland Frisian antou (“up to”).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).