How to check local fonts for presentation symbols

A symbol can look fine on your computer and turn into a square, question mark, or different character when you open the presentation elsewhere. This often happens because the font in use does not include that symbol, or the other computer does not have the font installed.

Use the Installed Fonts tool to preview text in fonts available on your computer. Then check the same symbols in your presentation app before sharing the deck.

Check the symbols in your fonts

1. Open the Installed Fonts tool in Chrome or Edge on a computer. Other browsers may show a reduced version of the tool or may not be able to list local fonts.
2. Collect the exact characters you plan to use. Include the symbols in context, such as →, ≤, €, accented letters, or the full sequence of a special character. Copy them from the source you will use in the slides so you do not accidentally test a similar-looking character.
3. Enter or paste your sample into the tool's text preview. Look through the font previews for a clear, consistent appearance. Check each character, not just the words around it.
4. Choose a likely font and try the same sample in the actual presentation. Select that font for the text, then check the symbols in slide view and in an exported copy if you plan to export the deck.

Test combinations as well as single symbols. For example, a letter with a combining accent can be made from more than one character, and some emoji or technical symbols may render differently depending on the font and operating system.

What the result means

The symbols look consistent in the font preview and in your slides

You have a usable font on this computer for the sample you tested. Check that the presentation is actually using that font for the symbols, rather than just nearby text. If other people need to edit the slides, they will also need access to the font or a suitable substitute.

A symbol appears as a box, blank space, or unexpected character

The font may not contain that character, or the tool or app may be substituting another font. Try a different font and test again. If the symbol still fails in the presentation, check that the source character is correct and that the app has not replaced it during copying or export.

The preview looks right, but the presentation does not

The presentation app may be using a different font, or it may handle the character differently from the browser preview. Select the intended font directly in the app, re-enter the sample if needed, and test an exported copy. A correct-looking browser preview alone does not prove that the finished deck will render the same way.

The deck works on your computer but not on another

The other computer may not have the font. The presentation can substitute a different font, changing symbols, line breaks, or spacing. Use a font available on the destination computer, embed the font if your presentation software supports it, or share a PDF when recipients only need to view the slides.

Fix missing or inconsistent symbols

1. Check the exact character. Copy the symbol from a trusted source and paste it into the slide again. Similar characters can have different code points, such as a hyphen and a minus sign.
2. Try a font with broader symbol coverage. Use the preview tool to compare other fonts, then confirm the result inside the presentation. A font may support common currency signs but not a less common technical or language symbol.
3. Confirm the font is installed. On Windows 11, check Settings › Personalization › Fonts. On macOS, open Font Book and look for the font in the list. If it is missing, install it from a source you trust, then close and reopen the presentation app.
4. Check the font applied to the symbol itself. Select the symbol or the specific text containing it and inspect the font setting in your presentation app. Some apps use a fallback font for a character even when the rest of the line uses your chosen font.
5. Test a copy on another device. Open the deck on a computer that does not have your preferred font, or ask a colleague to check it. If the layout changes, embed the font if supported, use a more widely available font, or provide a PDF for viewing.
6. Keep symbol fonts simple. If a specialized symbol is only available in a separate font, apply that font to the symbol alone and check its size and alignment. Avoid changing the entire paragraph to a decorative symbol font.

Why a symbol preview can be misleading

Browsers and presentation apps can substitute a different font when the selected font lacks a character. This fallback can make the symbol appear correctly even though the chosen font does not contain it. The substitute may have a different shape, weight, or baseline, so a line can look uneven even when nothing is missing.

For an important slide, check the symbol in the actual presentation app with the intended font selected. Then inspect the exported file or open a copy on another computer. For more on font testing before sharing, see how to check fonts before sharing a presentation and why a font may display characters it does not contain.

Installed Fonts works best in Chrome and Edge on a computer, and previews the fonts available to your browser without requiring an installation.