Drop it
Choose one PDF or dump in a whole stack. Nothing gets sent anywhere.
100% local / 0% suspicious cloud nonsense
Stop letting PDFs flashbang you.
Drop in a painfully white PDF. Get back a dark one with searchable, selectable text still alive and kicking.
🧠 no sign-up
🔒 never uploaded
⚡ browser-powered
LOCAL LAB
STAYS
ON DEVICE
Night shift starts here
Feed me your PDFs.
ON DEVICE
Toss PDF(s) here
or click the giant obvious button
Multiple files? Sure. Huge textbook? Your RAM decides.
Three extremely difficult steps
So simple it is almost insulting.
Browser magic
NightPDF flips the page colours locally while keeping native text intact.
Yoink it back
Download the dark copy and continue pretending sleep is optional.
WHY IT DOESN'T SUCK
Your PDF stays a PDF.
Many “dark PDF” tools flatten every page into an image. NightPDF edits the document structure instead, so text remains selectable, searchable, and crisp.
✓ no server upload
✓ no watermark
✓ no account
✓ no sad JPEG pages
A tiny nerd corner
Difference blend mode.
It injects a white page-sized layer using PDF blend math, flipping the underlying colours without rasterizing the content.
white + Difference = night mode