The PDF Dark Blog
Guides on converting, inverting, and darkening PDFs — browser-specific tips, platform walkthroughs, and how the conversion works under the hood. Every post has the converter one click away.
PDF Dark Mode in Chrome
Chrome's built-in PDF viewer has no dark toggle. Skip the extensions — convert in the browser itself.
PDF Dark Mode in Firefox
Firefox's PDF.js viewer only darkens the toolbar, not the pages. Here's the real fix.
How to Darken a PDF
A three-step walkthrough: drop, pick a theme, download. No accounts, no extensions, no uploads.
Darken a Scanned PDF Online
Free, browser-only tool for scanned PDFs that wash out your screen at night. Pick OLED for the deepest contrast.
Invert PDF Colors, Keep Your Images
Basic inverters turn photos into negatives. Here photos keep their colors — automatically, or under your control.
How the Conversion Works
Vector recoloring, image detection, and a per-page fallback chain — the engineering under the hood.
PDF Dark Mode in Microsoft Edge
Edge's dark theme skips your PDFs entirely. There's a flags-page hack that forces it — at the cost of every image in the document.
PDF Dark Mode in Adobe Acrobat
The 'Dark Gray' theme only skins the toolbar. The real page-darkening setting is buried in Accessibility preferences — and it's per-install, not per-file.
PDF Dark Mode Extensions, Mapped
What the Chrome and Edge stores actually offer, what breaks (images, local files, permissions), and a 4-point checklist before you install.
PDF Dark Mode on Mac
macOS Tahoe added a dark toggle to Preview. It's Preview-only and needs the latest macOS — here's what actually travels with the file.
PDF Dark Mode in Sumatra PDF
Sumatra already has two built-in tricks — the i key and a settings.txt edit. Here's why they fall short, and what stays dark everywhere instead.
PDF Dark Mode on Android
Android's default PDF viewers still don't have a real dark mode, and screen-invert flips everything negative. Convert once, read dark anywhere.
PDF Dark Mode on iPad & iPhone
iOS 26 finally added a Dark Background toggle for PDFs in Files and Books. Here's what it fixes — and what it still doesn't.
PDF Readers with Dark Mode, Compared
Acrobat, Foxit, Sumatra, Preview, Chrome, Edge, Firefox, mobile apps, extensions — which ones really darken the page, side by side.