Convert Your PDF to Dark Mode Instantly — Private & Free
Tired of straining your eyes while reading PDFs at night? DimlyPDF's PDF dark mode converter uses a hybrid MuPDF WebAssembly pipeline — rewriting vector color operators for typed text while smart-inverting embedded images, charts, and scanned pages. Unlike browser-level dark mode filters that simply invert the screen, this tool produces a real dark-mode PDF you can download and share. Choose from four carefully calibrated themes: OLED Black for AMOLED displays, Midnight for late-night reading, Warm Sepia to reduce blue-light exposure, and Dim Grey for a neutral dark background. All processing happens locally — your file never leaves your device.
Frequently asked questions
Does converting to dark mode affect text quality?
No. For text-based PDFs we only adjust drawing colors in the content stream. The text layer, fonts, and vector structure are unchanged, so selection and search behave like the original.
What dark themes are available?
Four themes: OLED Black (true black #000000, ideal for AMOLED displays), Midnight (deep navy, easier on the eyes), Warm Sepia (low-blue-light warm tone), and Dim Grey (neutral dark). Pick one before you convert.
Is there a file size limit?
Yes — each file can be up to 100 MB. Processing runs locally in your browser, so very large files depend on your device memory.
Can I convert scanned PDFs to dark mode?
Yes. DimlyPDF detects scanned pages and rasterizes them with smart color inversion so black ink and white paper swap correctly. Pure scans may lose text selectability; mixed documents keep typed text selectable while images are inverted.
What happens to charts, logos, and images in my PDF?
Embedded images are decoded and smart-inverted — near-white becomes your theme background and near-black becomes light grey, matching vector text. Enable “Preserve photo colors” to skip photographic images.
Do my files get uploaded to a server?
Never. The MuPDF engine runs as WebAssembly in your tab. Your PDF never leaves your device unless you save it yourself.
Will links and bookmarks still work after conversion?
Yes. Only the color drawing operators are rewritten. All hyperlinks, internal bookmarks, and annotations remain intact in the converted PDF.
How is DimlyPDF different from browser dark mode?
Browser dark mode applies a CSS filter to the screen — it doesn't change the actual file. DimlyPDF produces a real dark-mode PDF that looks dark everywhere, including in PDF viewers and print.