Image to PDF Converter — Convert JPG, PNG & Images to PDF Online Free

What image formats can I convert to PDF?

The Image to PDF Converter supports all common image formats: JPEG/JPG, PNG, WebP, BMP, and GIF. When you upload an image that uses an unsupported format, it is automatically ignored — you'll see only the supported images in your list. For best results, use JPG for photographs (smaller file sizes with good quality), PNG for screenshots and graphics with text or transparency, and WebP for modern web-optimized images. The converter embeds the original image data into the PDF at full resolution, preserving the quality of your source files regardless of format.

Is my data private when converting images to PDF online?

Absolutely. This tool runs entirely in your browser using client-side JavaScript and the pdf-lib library. When you upload images, they are read into your browser's memory using the FileReader API and rendered onto an HTML5 Canvas — no data is ever transmitted over the network, uploaded to any server, stored in any database, or accessible by any third party. You can safely convert sensitive documents like scanned IDs, medical records, signed contracts, or confidential business materials without privacy concerns. The entire process works offline after the initial page load — once the tool loads, you can disconnect from the internet and continue converting images to PDF without any external connection.

Source: pdf-lib — Create and modify PDF documents entirely in JavaScript

Can I combine multiple images into a single PDF?

Yes. Select multiple images at once by holding Ctrl (Windows) or Cmd (Mac) while clicking files in the file picker, or simply drag and drop multiple files onto the upload area. The tool supports up to 50 images in a single session — each image becomes one page in the final PDF. You can reorder pages using the up and down arrow buttons, remove individual images, or add more images at any time without losing your existing list. The converter automatically assigns one image per page, so a 10-image upload produces a 10-page PDF with each image filling its own page. If you need to merge existing PDF files instead of images, try one of the dedicated PDF merging tools available online — this converter is specifically designed for images to PDF conversion.

Is there a file size limit for images?

No, there is no hard file size limit enforced by the tool. You can upload large, high-resolution images — including 20+ MB DSLR photos or 40+ MB scanned documents — and the converter will process them correctly. However, very large images (50+ MB) may take longer to render onto the Canvas and embed into the PDF, especially on lower-end devices. A 20 MB photo typically converts in under 2 seconds on a modern laptop, while the same conversion on a mobile device may take 5-10 seconds. The tool displays a processing indicator during conversion so you know the operation is progressing. For the best experience with extremely large files, consider resizing images to 3000-5000 pixels on the longest side before uploading — you can use UtilDaily's Image Resizer & Compressor tool to optimize your images first.

Source: MDN — FileReader API

Does the converter preserve image quality in the PDF?

Yes. The Image to PDF Converter embeds each image at its original resolution using pdf-lib's embedding functions. PNG images are embedded using the PNG embedding method which preserves lossless quality including transparency and alpha channels. JPEG images are embedded using the JPEG embedding method which maintains the original JPEG compression quality — no re-compression occurs, so there is no generational quality loss. WebP, BMP, and GIF images are drawn onto the Canvas first and then exported as PNG before embedding into the PDF, which may result in slightly larger file sizes but preserves visual fidelity. The PDF output is high-resolution and suitable for professional use, printing, or archiving. If you're concerned about file size, use JPG source images which produce smaller PDFs at equivalent quality levels.

What page sizes and orientations are available?

The converter offers four page size options: A4 (210×297mm, the international standard), Letter (215.9×279.4mm, the US and Canada standard), Legal (215.9×355.6mm, used for legal documents), and Auto which creates pages at the exact pixel dimensions of each image (plus margins). Auto mode is ideal when you want the PDF page to match the image's original aspect ratio exactly. For A4, Letter, and Legal sizes, you can choose between Portrait orientation (taller than wide) and Landscape orientation (wider than tall). The margin can be set from 0 to 200 points (default: 40pt) — this is the space on all four sides of each page. For images with significant white borders, reduce margins; for edge-to-edge photographs, use small margins (10-20pt).

Can I convert images to PDF on my phone or tablet?

Yes. The tool is fully responsive and works on mobile browsers including Safari on iOS, Chrome on Android, and Samsung Internet. You can select images from your device gallery, take a photo with your camera, or drag and drop from your file manager. The drag-to-reorder interface works with touch controls on mobile. However, converting very large images (20+ MB) on mobile devices may be slower due to limited memory and processing power. A 5 MP photo (approximately 2-3 MB) typically converts in 1-3 seconds on a modern smartphone. For the best mobile experience, limit each session to 10-15 images at a time. The tool's touch-friendly layout with large buttons and clear visual feedback makes it convenient for on-the-go document creation from photos.

How do I convert a photo or picture to PDF?

Tap or click the upload area to select a photo from your device, or drag and drop the picture file directly onto the tool. The image appears in the list with its filename and dimensions. Customize the page size (A4 works best for most photos), orientation, and margin using the settings panel. Click Convert to PDF, then download the result. A photo converted at A4 size with adequate margins produces a clean, printable PDF ready for sharing, emailing, or archiving. If you need to convert multiple photos into a single PDF document (for example, to create a photo album, travel journal, or property inspection report), upload all photos at once, arrange them in the desired order, and convert in one step.