“onto” vs. “on to”
Use "onto" (one word) as a single preposition describing movement to a position on/touching a surface; use "on to" (two words) when "on" is part of a phrasal verb (move on, hold on, log on) followed by "to" introducing the next element.
onto
"Onto" is a single-word preposition meaning to a position on top of or in contact with something, describing movement toward a surface ("the cat jumped onto the table"). It combines "on" and "to" into a single preposition specifically to describe directional movement resulting in contact with a surface, distinct from simple static location (which would use "on" alone).
on to
"On to" is a two-word combination where "on" functions as part of a phrasal verb (like "hold on," "move on," "log on") and "to" functions as a separate preposition introducing what follows ("she held on to the railing," "let's move on to the next topic"). Unlike "onto," which is a single preposition of direction, "on to" involves two grammatically distinct words that happen to appear next to each other because of an unrelated phrasal verb construction.
The real distinction
The key test for distinguishing "onto" from "on to" is whether "on" belongs grammatically with the verb before it (forming a phrasal verb like "move on," "hold on," "log on," "carry on") rather than with "to" as a single preposition of direction — if "on" is part of the verb phrase, the words should stay separate as "on to" ("let's move on to the next agenda item," where "move on" is the phrasal verb and "to the next item" specifies the destination); if instead the sentence describes movement resulting in a position on top of or in contact with a surface, "onto" works as a single word ("the ball rolled onto the field"). A helpful diagnostic: try removing "to" entirely and see if the sentence still makes grammatical sense with "on" alone attached to the verb — "let's move on" and "she held on" both work fine without "to," confirming that "on" belongs with the verb, meaning you need the two-word "on to" when "to" is added back; but "the cat jumped on" (without "to") sounds incomplete in a way that confirms "onto" functions as a single, unified preposition of direction in the original sentence. This distinction is genuinely subtle and frequently gets blurred even in edited writing, making it one of the more advanced points of English usage.
Examples with “onto”
- The cat leaped gracefully onto the kitchen counter.
- She climbed onto the roof to fix the antenna.
- The ball rolled onto the field during the game.
- He stepped onto the stage to accept the award.
- The dog jumped onto the couch the moment they left.
- Water spilled onto the floor from the overflowing sink.
- She hopped onto the train just before the doors closed.
- The child climbed onto her father's shoulders for a better view.
- He tossed the keys onto the counter as he walked in.
- The plane touched down smoothly onto the runway.
Examples with “on to”
- Let's move on to the next item on the agenda.
- She held on to the railing as the boat rocked.
- Please log on to the system before the meeting starts.
- He passed the information on to his colleagues immediately.
- They decided to carry on to the next town despite the rain.
- She hung on to hope even during the hardest weeks.
- The team moved on to the semifinals after their win.
- He forwarded the email on to the rest of the department.
- They pressed on to the summit despite the worsening weather.
- She clung on to the last of her savings during the layoff.
Memory trick
Test it by dropping "to" entirely: if the sentence still works fine with just "on" attached to the verb ("move on," "hold on"), keep the two words separate as "on to." If dropping "to" leaves the sentence feeling incomplete (you wouldn't just say "the cat jumped on" and stop), you need the single word "onto" describing direction toward a surface.