Image to PDF: turning a stack of photos into a clean document
By the Converterzilla Team
We build privacy-first PDF and image tools that run entirely in your browser. Our team has shipped JavaScript file-processing apps used by thousands every day, and we write here about the libraries, trade-offs and patterns we use.
Image-to-PDF is one of those tools you don't realize you need until you do — and then you need it constantly. Receipts for expense reports, photos of whiteboards, product shots for a brief, scans of handwritten notes. Sending 12 separate JPGs is amateur hour. A single PDF is the move.
Page size matters
Auto-fit (each page sized to the image) looks the most modern and works perfectly for screen viewing. A4/Letter centers each image with whitespace and looks more "document-like" — better for printing or formal contexts.
Image order
If your images are named sequentially (IMG_001, IMG_002), most tools sort alphabetically and you're fine. For drag-and-drop input, the order you drop in becomes the order in the PDF. Always preview before sending.
Compression
JPGs go into the PDF compressed (no re-encoding needed). PNGs get embedded losslessly, which can produce a large file if you have many high-resolution screenshots. For a smaller PDF from PNG inputs, convert them to JPG first.
Common use cases
- Expense report receipts — A4 with header showing date
- Photo album sharing — Auto-fit, no margins
- Scanned multi-page documents — A4 with title on first page
Our upcoming Image to PDF tool will offer all these layouts plus drag-to-reorder thumbnails.