Use vertical text in Keynote on iPhone
Keynote supports vertical text in shapes and text boxes, so you can enter and edit text from top to bottom, such as in Chinese, Japanese and Korean. Each new line appears to the left of the one before it.
To use vertical text, your presentation must be formatted for Chinese, Japanese or Korean, or you must have at least one of these languages on your device’s preferred language list. To learn more, see Format a presentation for a different language and Change a presentation’s language and formatting.
Add vertical text to a text box or shape
You can turn vertical text on or off in text boxes and shapes at any time.
Tap a text box or shape.
Choose Make Text Vertical.
If the object already contains text, it becomes vertical and any additional text you add is vertical. If the object didn’t already contain text, any text you add is vertical.
To make the text horizontal again, tap the object, then choose Make Text Horizontal.
To return to your slide, tap
.
Fit characters horizontally in vertical text
You can fit two to four characters horizontally within vertical text. This is useful for writing a few Latin characters, such as numbers, so they can be read from left to right.
While writing vertical text, select two to four characters you want to rotate.
Tap
, then in the Text tab, tap 
.Tap Rotate to Horizontal.
When editing the horizontal characters, you can make all the characters bold, italic and so on, but you can’t edit the individual characters separately.
If you want the horizontal characters to appear vertically again, delete the characters and re-enter them.
Make characters full width
You can change text to full-width, upright characters.
Select the vertical text you want to make full width.
Tap
, then tap in the Text tab.Tap Make Full Width.
Tips for using vertical text
Here are a few things to keep in mind about using vertical text in your presentation:
If you copy an object that contains vertical text, such as a text box or shape, and then paste it into a Pages, Numbers or Keynote document, the object appears in the other document with vertical text.
If a Keynote presentation with vertical text in objects is opened in an older version of Keynote that doesn’t support vertical text, all text appears horizontally.
Keynote for iCloud can open a read-only image of a presentation with vertical text.