Best Practices for Converting Images to PDF (JPG, PNG, WebP) for Crisp, Professional Output

Different image formats offer distinct compression advantages when compiling a multi-page PDF: - **JPEG (JPG)**: Best suited for photographs, scanned paper receipts, and camera captures. JPEG uses lossy discrete cosine transform compression, resulting in compact file sizes with realistic color gradients. - **PNG (Portable Network Graphics)**: Ideal for digital diagrams, architectural blueprints, software screenshots, and documents containing sharp vector-like typography or transparent backgrounds. PNG uses lossless Deflate compression, ensuring razor-sharp line clarity. - **WebP**: Modern high-efficiency format developed by Google that delivers 25% to 35% smaller file sizes than JPG at equivalent visual quality.

When converting photos into PDF pages, avoiding distortion is critical: - **Aspect Ratio Locking**: Always scale images proportionally within the target page canvas. Stretching a 4:3 camera photo into an A4 aspect ratio results in unnatural distortion. - **Centering & Margins**: Adding a subtle 15mm margin around receipts and document scans creates a professional document appearance and prevents printer edge clipping. - **Uniform Page Sizing**: For formal submissions, enforce a consistent page box (such as A4: 595 x 842 pt, or US Letter: 612 x 792 pt) across all pages.

When taking pictures of paper documents with your phone: 1. **Ensure Flat Lighting**: Avoid harsh shadows across text lines by using indirect natural light or overhead LED illumination. 2. **Shoot Straight-On**: Position your phone parallel to the paper surface to minimize keystoning perspective distortion. 3. **Pre-Crop Rough Edges**: Use Crop Image to remove wooden desks, carpets, or background clutter before building your PDF. 4. **Fix Rotations**: If the phone camera saved the image sideways, rotate the thumbnail 90 degrees in the converter workspace.

Follow these steps on PDFDock: 1. Open [Images to PDF](/tools/images-to-pdf/). 2. Drag and drop all your images (JPG, PNG, WebP) into the workspace. 3. Reorder pages using drag-and-drop thumbnail cards to set your preferred reading order. 4. Rotate any sideways images using the individual 90° rotation buttons. 5. Click **Process Files** to build the PDF document in your browser's local RAM. 6. Click **Download** to save the finished PDF.