I built a small tool to make PDFs easier to read at night

I read a lot of PDFs at night, especially on my phone. And honestly, PDFs are not great for that. Most of them still feel like digital paper: white background, fixed layout, and tiny text. Dark mode helps a bit, but many tools only change the page color. The bigger problem for me was mobile reading. When the text is too small, I have to pinch zoom, move the page left and right, zoom out again, then repeat the same thing on the next paragraph. After doing that too many times, I thought: Why can’t I just read the PDF text like an article? So I built a small free tool: PDF Dark Mode It has two reading modes. Page color mode This keeps the original PDF layout, but makes the page darker and easier to read at night. I use this for scanned PDFs, tables, image-heavy documents, or files where the original layout matters. Text reading mode For selectable PDFs, the tool can extract the text and show it in a cleaner reading view. You can adjust the font size, line height, font family, and theme. This is the part I personally wanted most, because it makes mobile reading much more comfortable. Instead of constantly pinch-zooming a fixed PDF page, the PDF starts to feel more like a normal article. Privacy The tool runs locally in the browser. Your PDF is not uploaded to a server, and refreshing the page clears the current session. Try it You can try it here: PDF Dark Mode I built it for my own night reading, but I’d love to hear feedback from anyone who reads PDFs on mobile. Also, if you ever need to convert a dark PDF back to a light version, I made a related tool for that too: PDF Light Mode