So many things can affect a Style - literally any difference in the Style that creeps in
Invisible Style Mismatches --- When you paste or import content from one document to another, InDesign compares all applied formatting even stuff buried deep in preferences, hidden XML metadata, or platform-level text settings. The override might be triggered by:
- Language differences (like switching between "English: UK" and "English: USA")
- Slight differences in the font version (even with the same name)
- Default character-level settings that differ (superscript size, underline offset, optical margin alignment etc.)
- Minor typographic controls like that drop cap alignment or obscure Japanese/Asian text features (even if your doc is set to Roman languages)
Text Engine Garbage ---- Some overrides stem from what I'd call "text engine lint" InDesign hanging on to properties that were set somewhere in the document history, or imported from Word or XML. Things like:
- IdeoSpaceBehavior
- Diacritic positioning
- Mojikumi (Japanese justification rules)
These might not be relevant to your document, but if the original content had them even if hidden they stick.
Document-Specific Style Definitions
Even if you name paragraph styles the same across multiple documents, InDesign treats styles as unique to each document. If you copy from Doc A to Doc B, and "Body Text" has even one internal difference (like space after = 5.1mm vs 5.0mm), you get an override or a style conflict.
If InDesign has to choose between the two, it’ll usually take the destination doc’s version and mark pasted content as overridden.
Page Item vs. Text Frame Styles
Sometimes, overrides aren’t on the text itself but on the container.
For example
- Baseline grid settings
- Optical alignment
- Paragraph composer differences (single-line vs Adobe every-line)
- Hidden character-level tweaks that come from manually adjusted spacing
Best practices (sort of)
Paste without formatting: Use Paste Without Formatting (Ctrl+Shift+V / Cmd+Shift+V) to bypass this junk, or copy via the Story Editor. (You can also change your Preferences in the Clipboard Handling section you can choose to Paste Plain Text (this bypasses the 'junk'), but you'll lose other style formating, like bold etc))
Synchronise Book Styles
If you work with InDesign Books, you can sync all styles from a master doc to all others.
Create and stick to one Style Source Master file
Always copy from the same ‘golden’ doc with the cleanest styles.
What it all means
These overrides aren't your fault. They're InDesign trying to be precise, but sometimes it’s like measuring raindrops with a micrometer. If they don't affect the look, they're safe to clear, but you're right not to ignore them they can indicate deeper inconsistencies that may cause issues down the line, especially in XML workflows or accessibility exports.
This is why I always work with the Style Override Highlighter on - and clear as much inconsistencies as I can (usually all of them - and sometimes not - I get lazy I don't make a style for 1 line of text that has tracking -10, I just leave maybe that as an override - and to be honest, it's helpful when updating the document next time, I can see where I had to adjust text slightly to fit in a pinch - not everyone's cup of tea - that's why it's optional I guess).
AdChoices