RollPDF is a single-file horizontal PDF viewer with smooth drag-inertia scrolling, designed for reading manga, comics, and multi-page documents.
- Drag & drop — open a PDF by dropping it onto the page or via the Open button
- Horizontal scroll — all pages laid out side by side with no gaps; scroll continuously left or right
- Left / Right binding — toggle L-bind / R-bind; auto-detected from PDF ViewerPreferences
- Smooth inertia — short drag releases with friction decay; long drag (1s+) releases into constant-speed continuous scroll
- Fit Height — one-click scale to fill the viewer height; applied automatically on load
- CSS zoom — zoom in/out instantly via Ctrl+Wheel or toolbar buttons without re-rendering pages
- Fullscreen mode — press F or the fullscreen button; toolbar slides in on mouse hover at top edge
- Auto-hide overlays — page numbers and scroll indicator fade out 3 seconds after the last interaction
- URL parameters — open a specific PDF, page, binding, and autoscroll state via query string
- A modern web browser (Chrome, Edge, Firefox, Safari)
- No server or installation required — runs entirely as a static HTML file
Open a file Drop a PDF onto the viewer or click Open.
Navigate Drag horizontally to scroll. Use the mouse wheel (or trackpad) for horizontal scroll. Arrow keys move one step at a time.
Continuous scroll Drag for 1 second or more, then release — the viewer keeps scrolling at the average drag speed. Click or press Escape to stop.
Zoom
Use Ctrl + Wheel to zoom in/out, or the + / − toolbar buttons. Click FIT to fit the page height to the window.
Binding direction Click L-bind / R-bind to toggle page order. Right-to-left PDFs (manga) are detected automatically.
Fullscreen Press F or click the fullscreen button. Move the mouse to the top of the screen to reveal the toolbar.
URL parameters
| Parameter | Values | Description |
|---|---|---|
pdf |
URL | Remote PDF to load on startup |
page |
number | Page to scroll to on open |
binding |
R / L |
Override binding direction |
autoscroll |
on / off |
Start continuous scroll automatically |
Example:
RollPDF.html?pdf=https://example.com/book.pdf&page=3&binding=R&autoscroll=on