doPreview Help & FAQ

doPreview Help & FAQ

This page is focused on setup, controls, and troubleshooting for doPreview on iOS and macOS.

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Quick Start

  1. Open doPreview and select an image.
  2. Select target displays in the display list (default is all selected).
  3. Choose Window Size: Full Screen or 50% Display Size.
  4. (Optional) Enable Prevent Display Sleep.
  5. Click Start Preview.

Supported Platforms

  • iOS: iOS 16.0 or later (iPhone and iPad)
  • macOS: macOS 13.7.8 or later
  • Displays: Built-in plus supported external displays (USB-C/HDMI and AirPlay where available)
  • Localization: 11 languages

Controls

iOS

  • Pan with touch drag.
  • Zoom with pinch or on-screen zoom controls.
  • Change background using preset colors or custom color.
  • Close active previews from the close control.

macOS

  • Pan with mouse/trackpad drag or scrolling.
  • Zoom with gestures and zoom controls.
  • Use background presets and custom color picker.
  • Close image windows from controls or app commands.

Zoom range: 10% to 6400%.

Keyboard Shortcuts (macOS)

  • Open Image: ⌘O
  • Start Preview: ⌘↩
  • Refresh Displays: ⌘R
  • Close Image Windows: ⇧⌘W
  • Close Image Windows (Escape): Esc
  • Show/Hide Preview Controls: ⌘/
  • Prevent/Allow Display Sleep: ⇧⌘S
  • Zoom In: ⌘=
  • Zoom Out: ⌘-

Shortcuts App Action

doPreview includes a Start Image Preview action with parameters for image file, target displays (built-in/external/all), window size, controls visibility, background, and zoom percent.

Supported Image Types

doPreview uses Apple image decoding frameworks. Common supported types include JPEG, PNG, HEIF/HEIC, TIFF, GIF, and BMP, plus other formats supported by iOS/macOS image frameworks on your device.

Troubleshooting

Start Preview is disabled

Select an image first. Start Preview is enabled only after an image is loaded.

External display is not showing output on iOS

Connect the display first (USB-C/HDMI or AirPlay), confirm it appears in the display list, keep it selected, then start preview again.

Preview controls are hidden

Enable Show Preview Controls in the main app settings (or use the Preview menu command on macOS).

FAQ

Do all displays stay synchronized?

Yes. Pan, zoom, and background settings are shared across active preview outputs.

Can I hide the overlay controls?

Yes. Toggle Show Preview Controls off.

Support

Questions: dennis@dohernandez.net

Privacy details: doPreview Privacy