Quick answer: A deck looks right on the author's machine and different on the presenter's laptop. The font is replaced, the line breaks shift, and the text overflows the boxes. The cause is almost always the same: the font isn't installed on the second machine.

Why it happens

PowerPoint stores the font name in the file, but not the font itself, unless it's embedded. When the file opens on a machine without the font, PowerPoint substitutes a different one that has different metrics: the widths and the line heights differ, and the layout reflows.

The signs

  • The headline wraps to a different line.
  • The text overflows the box or leaves a large gap.
  • The font looks "almost right but not quite."
  • The font name in the font menu is different.
  • A warning about fonts appears in the document.

How to confirm

  1. Select the text and read the font name.
  2. Open the font list on the presenting machine and check whether the font is installed.
  3. If the font is missing, PowerPoint has substituted it.

The fixes

1. Embed the font. The embedding keeps the font in the file, with the embedding steps here.

2. Use a standard font. Fonts that are installed with the operating system don't get replaced on the same platform.

3. Install the font. The presenting machine can install the font if the license allows it.

4. Send the PDF. A read-only PDF preserves the layout and the fonts.

The cross-platform case

A font that exists on Windows may not exist on macOS, and the reverse. The same issue appears when the deck moves from a web tool to PowerPoint. The Canva export guide covers the web-to-PPTX case.

The CJK case

Missing Chinese, Japanese, and Korean fonts are more noticeable because the substitute can be from a different language. The correct font for the language matters:

  • Japanese: Yu Gothic.
  • Korean: Malgun Gothic.
  • Simplified Chinese: Microsoft YaHei.
  • Traditional Chinese: SimSun.

The CJK guide details the language-specific choice.

The layout fix after substitution

Even after the font is restored, the boxes may have been adjusted. Check:

  • The headline and the body line breaks.
  • The text box alignment to the grid.
  • The charts and the labels that reflowed.
  • The table cells.

Frequently asked questions

Why does the deck look fine on one computer but not another? The font is installed on one machine and not the other. Does embedding fully prevent the change? When the license allows embedding and the reader supports it, yes. Can I see which fonts are missing? The PowerPoint font warnings and the font menu list the fonts; the file inspection also shows embedded fonts. Does the PDF help? The PDF preserves the look but is not editable.

Embed the font, check the presenting machine, and send the PDF as the read-only backup.

Related guide: the AI PowerPoint generator guide.