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I was writing something along "... I could only read upto page 34" when my spell-check app Grammarly complained that I should rather use "up to".

So, what's the difference between the two and is there really any difference? Or is it that the condensation "upto" is not technically allowed?

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    You can use the following self-test: Does the single word say something different from the two words? If not, stay with two words. By contrast, into and onto do mean things other than in to and on to, so they work as single words. Commented Jun 25, 2017 at 17:29
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    It is not off topic - I am here as a native speaker and linguist because Microsoft Word rejected it, and I was looking for a linguistic discussion. I do not allow my non-English background students to use Grammarly because it makes things worse in my experience. I was spending time correcting one draft, only to find the next draft was worse because they had past it through Grammarly first. I don't know to what extent there are even native speakers associated with the product. Commented Jan 10, 2018 at 8:15
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    David - it is off topic here. If you read our tour and How to Ask pages you will understand this site's scope.
    – Rory Alsop
    Commented Jan 10, 2018 at 9:01

2 Answers 2

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Upto is a misspelling of up to. -- Wiktionary

Use up to with a space between the two words. Also, as Yosef Baskin says:

You can use the following self-test: Does the single word say something different from the two words? If not, stay with two words. By contrast, into and onto do mean things other than in to and on to, so they work as single words.

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    Excellent advice - only problem is it doesn't always work. There are many words involving prepositions or particles (clitics) where spell checkers correct me away from what I regard as correct and vice-versa. And these conventions change over time. The words into and onto are not intrinsically different from out of and up to - and as a native speaker and linguist I regard upto as perfectly correct when it functions. I too am here because Microsoft Word rejected it and was looking for a linguistic discussion. Commented Jan 10, 2018 at 8:13
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Up to is always two words. Upto isn't listed in the dictionaries. You should always avoid it.

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