Limits of 'Fit to Artwork Bounds' in Illustrator: Exclusion of Locked, Hidden, and Symbol Objects

Answer

The exclusion of locked layers, hidden layers, symbol instances, and text overflow is intentional and documented in Illustrator’s behavior: Fit to Artwork Bounds calculates the artboard size from the bounding box of only visible, unlocked objects.

Confirmed facts

• Objects on locked or hidden layers are not examined for the calculation.
• A symbol instance is treated as a single object whose bounds are the symbol’s registration point; the internal geometry of the symbol definition is ignored unless the instance is expanded.
• Text frames are measured by their rectangular frame, not by the glyph outlines, so any overflow text does not enlarge the artboard.
• This design keeps the command predictable and avoids accidental artboard growth from content the user has chosen to lock, hide, or treat as a reusable symbol.

Steps to include the excluded content

1. Locked/hidden layers: In the Layers panel, unlock the layer(s) and click the eye icon to show them. Run Object → Artboards → Fit to Artwork Bounds again.
2. Symbol instances: Select the instance(s) and choose Object → Expand (or Break Link to Symbol then expand). After expansion, run the fit command.
3. Text overflow: Either convert the text to outlines (Type → Create Outlines) or resize the text frame to fit its content (Type → Area Type Options, adjust height, then run the fit command).

When to ask for more detail

If you need to keep symbols editable or preserve layer lock/hide states while still enlarging the artboard, let me know which workflow priority (editability vs. artboard size) is most important, and I can suggest a non‑destructive alternative.