Mobile & touch

Pinch zoom, two-finger rotate, swipe, long-press, palm-rejected stylus input, and a responsive toolbar that folds excess actions into an overflow menu on narrow viewports.

Touch gestures

import { bindTouchGestures } from '@trupdf/viewer';
 
bindTouchGestures(host, { engine, sensitivity: 1 });

Gesture	Action
Single-finger drag	Pan
Two-finger pinch	Zoom
Two-finger rotate	Rotate page
Two-finger swipe	Page nav
Long-press	Context menu (annotation hit-testing)
Double-tap	Zoom-to-fit / zoom-to-text-region

Stylus & pen

import { bindStylusInput, applyPressureCurve } from '@trupdf/viewer';
 
bindStylusInput(canvas, {
  pressureCurve: applyPressureCurve('firm'),
  palmRejection: true,
  coalesce: true,
});

Apple Pencil (iPad) — via PointerEvents; pressure, tilt, twist.
S Pen (Android Galaxy) — via PointerEvents.
Wacom tablets — via PointerEvents on Chrome / Edge.
Catmull-Rom stroke smoothing.
Coalesced events for low-latency ink rendering.
Palm rejection on by default.

Buttons are 36 px on mouse pointers, 44 px on coarse pointers (matches Apple HIG / Material touch target). The toolbar folds excess actions into an overflow menu on narrow viewports.

CSS auto-detect:

@media (pointer: coarse) {
  .trupdf-viewer {
    --trupdf-button-size: 44px;
  }
}

Collapsible panels

On small screens the left dock (thumbnails / outline / comments) collapses to a fly-out drawer. Trigger via the hamburger or a swipe gesture from the left edge.

iOS / iPadOS

File picker uses input[type=file], which iOS surfaces through the Files app and iCloud.
PencilKit bridge planned (Phase 6 follow-up) for native ink → XFDF.
Standalone PWA install supported when hosted at trupdf.truenotech.com.

Android

File picker uses the system Storage Access Framework.
S Pen hover preview supported on Galaxy Tab / Note devices.
File attachment open uses the share intent.