Start with the reversible iPhone and iPad option
The system appearance setting and the accessibility inversion controls solve different problems. Dark Mode themes supported interfaces; Invert Colours changes how content is displayed and is more likely to affect a bright PDF page.
Use Smart Invert or Classic Invert
- Open the Settings app on your iPhone or iPad.
- Tap Accessibility.
- Tap Display & Text Size.
- Scroll down and toggle on Smart Invert.
Smart Invert tries to leave images and media unchanged. Classic Invert reverses everything. Test a page with photos before deciding which is more legible.
Make inversion easy to toggle
Add your preferred inversion control under Settings → Accessibility → Accessibility Shortcut. You can then use the device’s accessibility shortcut when entering and leaving the PDF reader.
Annotation apps need an extra check
A display inversion can also change the apparent color of highlighters, pen strokes, diagrams, and imported images. Before annotating a long document, add a few test marks and turn inversion off again. Confirm that the saved ink colors are what you intended.
| Goal | Best starting point | Watch for |
|---|---|---|
| Read without editing | Smart Invert | Mixed pages with photos |
| Maximum whole-screen inversion | Classic Invert | Every image and app color changes |
| Share a dark-looking file | Converted copy | Rasterized output limitations |
Create a copy that stays dark in other apps
- Open the PDF dark mode tool in Safari.
- Choose the PDF from Files and select a reading palette.
- Preview a photo-heavy page and a text-heavy page.
- Convert, download, and save the new copy back to Files.
- Open that copy in the destination app before adding annotations.
Important preservation limit
The current converted file is made from rendered pages. It does not retain selectable text, links, form fields, or existing annotations. Keep the source document.
Need a portable dark copy?
Use this when the appearance must survive after Smart Invert is switched off or when the file moves to another device.
Convert a PDF in Safari →Official reference
Apple’s Display & Text Size guide explains Smart Invert, Classic Invert, contrast, and color filters.