Add PDF Dark to Readers and viewers

[1436941541]

Adds PDF Dark to the Readers and viewers section.

Closes #18

What it does

PDF Dark is a free, open-source web app that converts any PDF to dark mode entirely in the browser. It uses PDF.js for rendering and applies color inversion + theme transforms client-side, so files are never uploaded — making it usable for sensitive or confidential documents too. Supports four themes (true dark, sepia, blue-tint, high-contrast) and preserves embedded images.

Why it fits

The Readers and viewers section already lists tools like mozilla/pdf.js and Sioyek. PDF Dark serves the same purpose — a PDF reader/viewer — with a complementary niche (eye-friendly dark mode for night reading) and a notable privacy property (zero upload, fully client-side).

• Website: https://pdfdark.org
• Repo: https://github.com/1436941541/pdf-dark
• License: MIT

[1436941541]

Friendly ping on this one 👋 — happy to adjust placement, wording, or anything else that would make it easier to merge. Thanks for maintaining the list!

[avvertix]

Hi @1436941541 at a glance converting a PDF to dark mode make sense and is also a quite complex task.

Took me a bit of time to test and check all the pages of https://pdfdark.org/

I see a few problems at a glance

1. A couple of PDFs I tested result in pink (picture 1) colors for every theme
2. For PDF that worked the end result doesn't look sharp as you convert each page to image, and become even worse when there are tables (picture 2)
3. The privacy policy is missing the data controller, which should explicitly mention a company name and address that can be verified

Picture 1	Picture 2

The Readers and viewers section already lists tools like mozilla/pdf.js and Sioyek. PDF Dark serves the same purpose

I have a tendency to say that your service is not a viewer, it goes under "creation and process" as the final output is a downloadable PDF.

[1436941541]

Rebased onto the latest main — the merge conflict should be resolved and the PR is now mergeable. Happy to adjust the wording or section if needed. Thanks for maintaining the list!