Image to PDF & Document Filters
NVIN Scanner makes it simple to convert existing photo albums, gallery screenshots, and receipts into standardized, shareable PDF documents.
Importing from Device Gallery
If you already took photos using your phone's default camera or downloaded images from WhatsApp, you can batch import them directly:
- Open NVIN Scanner and tap the Import Gallery button on the home screen.
- Select one or multiple images in the Android media picker.
- In the thumbnail reorder screen, drag and drop cards to adjust the sequence of pages.
- Tap any individual page to fine-tune edge crops or rotate orientation.
- Choose your preferred document filter preset and tap Compile PDF.
Choosing the Right Document Filter
PresetBlack & White (High-Pass Threshold)
Ultra Compact (typically 150KB - 400KB per 10 pages)Analyzes luminance across local pixel neighborhoods to push paper textures and ambient shadows to pure white (#FFFFFF) while sharpening text to deep black (#000000).
PresetGrayscale (Monochrome Gradient)
Medium (approx. 500KB - 1.2MB for 10 pages)Removes chrominance color channels while maintaining 256 levels of smooth gray shading, preserving delicate handwriting gradients without clipping.
PresetOriginal (True Color)
Standard (approx. 1.5MB - 3.5MB for 10 pages depending on resolution)Retains the full RGB color spectrum captured by your camera sensor. Applies subtle contrast enhancement to ensure vivid legibility without altering original colors.
Was this documentation guide helpful?
Your feedback helps our engineering team refine application documentation.