Deep Dive: Image to PDF Converter
PDF generation from images involves creating document structure (header, page tree, content streams), embedding image data as objects, defining page dimensions matching image aspect ratios or standard sizes (A4, Letter). This tool uses PDF libraries that construct valid PDF syntax in JavaScript—reads your images into memory, embeds as JPEG or PNG streams within PDF objects, writes cross-reference tables and trailers. Supports multiple images becoming individual pages or layouts (2x2 grid, contact sheet). Resolution considerations: 300 DPI for print quality, 150 DPI for screen viewing, 72 DPI for email-friendly sizes. All processing client-side—scanned receipts, personal photos, business documents never transmit externally. Useful for creating submission-ready document packages, archiving photos in widely-compatible format, consolidating multi-image workflows into single files.
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Privacy Architecture
This tool uses client-side WebAssembly to ensure your data never touches a server. Secure, fast, and privacy-focused by design.
Core Capabilities
- Convert JPG, PNG, and WEBP to PDF
- Merge multiple images into one PDF
- Drag and drop reordering
- Adjust page orientation (Portrait/Landscape)
- No file size limits
- 100% Private (No uploads)
- Works offline
- Free to use
Why It Matters
- Organization: Combine scattered photos into one neat document.
- Sharing: Send one PDF instead of 20 separate image attachments.
- Privacy: Your personal photos never leave your computer.
- Quality: Preserves the visual quality of your images.
- Speed: No upload wait times for large files.
Quick Start Guide
Drag and drop your images into the upload area.
Arrange the images in the order you want them to appear.
Choose your preferred page size and orientation.
Click 'Convert to PDF' to generate your document.
Download your new PDF file instantly.
Usage Examples
Receipt Collection
Scenario 01Combine expense receipts into single PDF
10 receipt photos (JPG)
expenses_march.pdf - all receipts in one file
Photo Portfolio
Scenario 02Create professional portfolio PDF
25 photos from photoshoot
portfolio.pdf - ready to send to clients
Scanned Documents
Scenario 03Multi-page document from phone scans
Page 1.jpg, Page 2.jpg... Page 15.jpg
complete_contract.pdf - printable document!
Common Scenarios
Expense Report Submission
Combine all receipt photos for reimbursement.
Property Listing
Create PDF brochure from property photos.
Presentation Handout
Convert slide screenshots to PDF.
Digital Portfolio
Photographers/designers create portfolio PDF.
Questions?
Technical Architecture
How Image→PDF Conversion Works
**The Process**: 1. **Load Images**: Read all JPG/PNG/WebP files 2. **Create PDF Pages**: Each image becomes one page 3. **Fit to Page**: Scale image to fit chosen page size 4. **Maintain Aspect Ratio**: No distortion 5. **Combine**: Merge all pages into single PDF 6. **Download**: Save as .pdf file **Page Sizing**: - Portrait: Fits vertical images (photos) - Landscape: Fits horizontal images (slides) - Auto: Chooses best fit per image **Quality**: Images embedded as-is. No compression or quality loss during conversion!
Page Size & Orientation
**Standard Page Sizes**: - A4 (210×297mm) - Most common - Letter (8.5×11in) - US standard - Custom - Match image dimensions **Orientation**: - **Portrait** (vertical): Best for phone photos, receipts - **Landscape** (horizontal): Best for screenshots, wide photos **Fitting Images**: Images scaled to FIT page without cropping: - Smaller image → centered with white space - Larger image → scaled down to fit - Aspect ratio always preserved (no stretching) **One image = One page**: Upload 10 images → get 10-page PDF!
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