Convert photo collections, scanned receipts, office documents, and web graphics into clean, high-resolution PDF files with our free Image to PDF Converter. Upload single or multiple images (JPG, PNG, WebP, GIF) and combine them into a single PDF document. Choose between auto-fitting page sizes, standard A4 Portrait, A4 Landscape, or US Letter page presets—all processed locally inside browser RAM with zero file uploads.
Select JPG, PNG, WebP, GIF, or HEIC image files from your computer.
Reorder image thumbnails, set page orientation (portrait/landscape), and adjust margins.
Click Convert to PDF to compile all images into a clean PDF document and save.
Upload multiple JPG, PNG, WebP, or GIF files at once and sequence them sequentially into a single merged PDF file.
Scale photos automatically using Proportional Fit or align them to standardized A4 or US Letter page geometries.
All image embedding and PDF construction happen entirely within browser memory RAM. Zero files are uploaded to remote servers.
Inside a PDF document architecture, images are stored as independent stream objects known as Image XObjects (/Type /XObject /Subtype /Image). When converting JPEG images, pdf-lib embeds compressed DCT discrete cosine transform streams directly without re-compression, ensuring zero loss of original photographic clarity.
For web formats such as WebP or animated GIFs, client-side JavaScript utilizes the HTML5 createImageBitmap() API and offscreen 2D Canvas contexts to transcode pixels into lossless PNG byte streams (FlateDecode filters). This guarantees universal rendering across all desktop and mobile PDF viewers without requiring external native dependencies.
Page layout calculations convert physical page dimensions into 72 points-per-inch (DPI) vector space. When drawing images with page.drawImage(), aspect ratios are calculated (imgWidth / imgHeight) to center each image proportionally on the canvas, preventing stretching or distorting your photos.