# DimlyPDF

> Free online tool that converts any PDF to dark mode in seconds. Text stays selectable and searchable. All processing happens locally in the browser — no file uploads, no server, no account required.

URL: https://dimlypdf.akashdev.pro/

## What it does

DimlyPDF takes a standard PDF (white background, black text) and converts it to a dark-mode version. The output PDF has a dark background (user-selectable theme) with light-coloured text. Unlike raster-based converters, DimlyPDF uses MuPDF WebAssembly to rewrite PDF color operators directly inside the content streams, so all text layers, hyperlinks, bookmarks, and form fields remain fully functional.

## How to use

1. Open https://dimlypdf.akashdev.pro/
2. Select a dark-mode theme: OLED Black, Midnight (navy), Warm Sepia, or Dim Grey
3. Drop a PDF file onto the upload zone or click to browse
4. Click "Convert to Dark Mode"
5. Download the converted PDF

No account or sign-up required. The file never leaves the user's browser.

## Key features

- **Selectable text preserved** — color operators in PDF content streams are rewritten, not rasterized
- **100% client-side** — powered by MuPDF compiled to WebAssembly; zero server contact
- **Four dark themes** — OLED Black (#000000), Midnight (#00132d), Warm Sepia (#2a241e), Dim Grey (#2c2c2e)
- **Links and bookmarks intact** — only draw instructions are modified
- **Up to 100 MB** — large files processed entirely in browser memory
- **Free, no account** — open the site and start converting immediately
- **Offline capable** — works after initial page load with no network required

## Technical details

- Engine: MuPDF 1.27 compiled to WebAssembly, running in a Web Worker
- Conversion method: PDF content stream rewriting (rg/RG/g/G/k/K color operators inverted; explicit dark background rectangle prepended per page)
- Build: React 18 + TypeScript + Vite, served as a static single-page app
- Privacy: no analytics beyond standard CDN access logs; no file data ever transmitted

## Target audience

- Students and researchers reading academic papers, textbooks, or lecture slides in low-light environments
- Professionals who receive white-background PDFs (reports, contracts, documentation) and prefer dark mode
- Anyone who experiences eye strain from bright document backgrounds

## Frequently asked questions

**Does text stay selectable?**
Yes. For text-based PDFs, the native MuPDF pipeline rewrites only color instructions. All text, hyperlinks, and bookmarks remain intact.

**Does it work on scanned PDFs?**
Partially. The dark background is applied; however, scanned page images embedded in the PDF are not re-colorised by the content-stream approach.

**Is my file safe?**
Yes. Nothing is uploaded. Processing is entirely in-browser using WebAssembly.

**Is it free?**
Yes — completely free, no account, no usage limits beyond the 100 MB per-file cap.

## Contact / source

Site: https://dimlypdf.akashdev.pro/