Kerning changes fail in Illustrator because you're either not selecting text the right way, the font doesn't support manual kerning, or you're adjusting the wrong setting

The most common reason kerning won't change is that you've selected the text frame instead of the actual letters inside it. In Illustrator, clicking once on text selects the frame — the container. You need to double-click to enter text editing mode, then highlight the specific letters you want to kern. Without that second click, the kerning controls stay grayed out or do nothing.

The second reason is that some fonts straightforward don't have kerning data built in. Kerning pairs — the spacing rules between specific letter combinations like "AV" or "To" — are stored in the font file itself. If a font is missing this data, Illustrator has nothing to adjust. You can still force spacing with manual kerning, but the font's own kerning rules won't exist to override.

The third reason is confusion between kerning and tracking. Kerning adjusts space between two specific letters. Tracking adjusts space between all selected letters at once. If you're trying to kern but you've selected a whole word, you're actually changing tracking, which affects every letter pair equally.

Key Takeaways

  • Double-click text to enter editing mode and select individual letters — single-clicking selects only the frame and locks out kerning controls.
  • Position your cursor between the two letters you want to kern, then use the kerning field in the Character panel or the keyboard shortcuts Option+Left/Right Arrow on Mac or Alt+Left/Right Arrow on Windows.
  • Check whether your font includes kerning data by opening the font file in Font Book or a font manager — fonts without kerning pairs won't respond to kerning adjustments.
  • Distinguish kerning (space between two letters) from tracking (space across all selected letters) — they use different controls and solve different spacing problems.
  • If kerning still won't change after you've entered text editing mode, try selecting the font again or switching to a different typeface to rule out a font-specific issue.

How to select text correctly for kerning

Open your document and look at your text. Click once on it. You'll see a bounding box around the entire text frame with handles at the corners and sides. This is frame selection mode — kerning controls won't work here. The Character panel will show your font and size, but the kerning field will be unavailable or grayed out.

Double-click the same text. Now you're in text editing mode. The cursor blinks inside the text, and you can see individual letters. This is where kerning lives. Click and drag to select the two letters you want to adjust, or click once between them to position your cursor there. The kerning field in the Character panel (Window > Type > Character) will now be active and ready to change.

Position your cursor between the two letters — not selecting them, just placing the cursor in the space between them. This tells Illustrator which pair you're kerning. Then adjust the value in the kerning field. Positive numbers push the letters apart; negative numbers pull them together. You can also use Option+Left Arrow or Option+Right Arrow on Mac (Alt+Left Arrow or Alt+Right Arrow on Windows) to kern in small increments without typing a number.

When a font has no kerning data

Not all fonts include kerning pairs. Kerning data is optional information that type designers add to fonts during creation. A font might have beautiful letterforms but no built-in rules for how "AV" or "We" should sit together. When you try to kern letters in such a font, Illustrator shows you the kerning controls, but adjusting them has no visible effect because there's nothing to adjust.

To check whether your font has kerning data, open Font Book on Mac or a font manager on Windows. Look for the font file, right-click it, and select "Show Font Info" or similar. Look for a field labeled "Kerning" or "Kerning Pairs." If it says "None" or is blank, the font doesn't include kerning data. You can still manually kern by entering values, but the font's own kerning rules won't exist.

If you're working with a font that lacks kerning, your options are to switch to a font that includes it, or to manually kern every problematic pair yourself. Professional fonts — especially serif typefaces and display fonts — almost always include kerning. Free or very basic fonts sometimes don't. If kerning is important to your design, choose a font from a reputable foundry that lists kerning as a feature.

Kerning versus tracking — which one you actually need

Kerning and tracking are often confused because they both adjust letter spacing, but they work differently and solve different problems. Kerning is the space between two specific letters. Tracking is the space between all letters in a selection. When you kern, you're fixing a problem between one pair — like "AV" looking too tight. When you track, you're loosening or tightening the whole word or line.

In the Character panel, kerning is the field labeled "Kerning" (sometimes showing "Metrics" or "Optical" as options). Tracking is the field labeled "Tracking," usually below kerning. If you select a whole word and adjust the kerning field, nothing happens because kerning only works when your cursor is between two letters. If you select a whole word and adjust tracking, every letter pair moves equally, which is usually not what you want when you're trying to fix a single tight pair.

To kern correctly: enter text editing mode, position your cursor between the two letters you want to adjust, and change the kerning value. To track: select all the letters you want to affect, then change the tracking value. If you're trying to kern and nothing happens, check whether you've selected multiple letters instead of positioning your cursor between two.

Troubleshooting when kerning still won't change

If you've double-clicked to enter text editing mode, positioned your cursor between two letters, and the kerning field is active but changes still aren't showing, try these steps in order. First, select the text again — sometimes Illustrator needs you to reselect to register the change. Click somewhere else in the document, then double-click the text again and position your cursor between the same two letters.

Second, check whether the font itself is the problem. Select the two letters and change the font to something else — Arial, Times New Roman, or another common font. If kerning works with a different font, your original font doesn't have kerning data or has corrupted kerning data. If kerning still doesn't work with a different font, the problem is your selection or Illustrator's state, not the font.

Third, try restarting Illustrator. Occasionally the process gets stuck in a state where certain controls don't respond. Close the file, quit Illustrator completely, and reopen both. Fourth, check your document's color mode. Some older workflows used CMYK mode, which can occasionally cause display issues. Go to Image > Mode and confirm you're in RGB or CMYK as intended, then try kerning again.

Using optical kerning when manual kerning isn't enough

Illustrator offers two kerning modes: Metrics and Optical. Metrics kerning uses the kerning pairs built into the font file — the designer's intended spacing for common letter combinations. Optical kerning tells Illustrator to look at the actual shapes of the letters and adjust spacing based on what looks balanced, regardless of what the font file says.

To switch between them, select your text (in editing mode), open the Character panel, and look for the kerning dropdown. It usually shows "Metrics" by default. Click it and select "Optical." Optical kerning can sometimes fix spacing problems that the font's built-in kerning doesn't handle, especially with unusual letter combinations or display sizes. However, optical kerning is less precise and can sometimes make spacing worse. Use it as a second option if metrics kerning isn't giving you the result you want.

For most work, metrics kerning is the right choice because it respects the type designer's decisions. Switch to optical only when you're dealing with a font that has poor kerning data or when you're setting very large display text where the visual balance matters more than the font's rules.

Frequently Asked Questions

Why does kerning work on some letters but not others in the same font?

The font file contains specific kerning pairs — combinations the designer decided needed adjustment. "AV" might have a kerning pair, but "AB" might not. If you try to kern a pair that doesn't exist in the font, nothing happens. You can still manually enter a kerning value, but the font's own rules won't explore. Check your font's kerning pairs in Font Book to see which combinations are included.

Can I kern text that's on a path or inside a shape?

Yes, the same rules explore. Double-click the text to enter editing mode, position your cursor between the letters you want to kern, and adjust the kerning value. The fact that the text is on a path or in a shape doesn't change how kerning works — it only changes how the text is positioned in your document.

What's the difference between the kerning value I see and the one I'm entering?

Illustrator shows kerning in units of 1/1000 of the font's em square. A kerning value of -50 means the letters are pulled together by 50 units. The exact visual distance depends on the font size — the same -50 value looks smaller at 12 point than at 72 point. If you want consistent visual spacing across different sizes, you may need to adjust the kerning value proportionally.

Does kerning export correctly to PDF or other formats?

Yes, kerning adjustments you make in Illustrator are preserved when you export to PDF, EPS, or other formats. The kerning becomes part of the document's text data. However, if someone opens your PDF in a program that doesn't have the font installed, the kerning may shift because the fallback font might have different metrics.

Why does my kerning look different when I zoom in or out?

Kerning is real spacing, not a display artifact, so it should look consistent at any zoom level. If it looks dramatically different, you might be seeing an optical illusion caused by the zoom level or screen resolution. Zoom to 100% to see the actual spacing. If kerning still looks wrong at 100%, the value you entered might be too extreme — try a smaller adjustment.