axiomape.com

JPG to PDF Converter

Compile a stack of images into a single PDF document - entirely in your browser.

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Drag and Drop Your Images Here

Supports JPG, PNG, and WebP files. Add multiple images at once.

⚙️ Page Layout Settings

"Fit to Image" keeps original proportions. A4 and US Letter are standard document sizes used in offices and print shops. Page Geometry is the term for a page's physical dimensions and orientation.
Margins add white space around your image on each PDF page. "Full bleed" means the image extends to the very edge of the page - useful for photos.

The Ultimate Guide to Converting Images to PDF Format

Converting a collection of images into a single, unified PDF document is one of the most common document management tasks for students, office workers, and freelancers alike. Whether you have scanned receipts, photographed notes, product photos, or artwork to share, compiling them into one PDF creates a professional, universally readable package. Unlike a folder of loose image files, a PDF preserves the exact page order, can be emailed as a single attachment, and is viewable on virtually every device without installing special software. This tool was built to make that process as fast and private as possible - no accounts, no uploads, no waiting.

One of the most important concepts to understand when working with image-based PDFs is the aspect ratio - the mathematical relationship between an image's width and its height. For example, a standard smartphone photo commonly has a 4:3 aspect ratio, meaning it is four units wide for every three units tall. If a converter ignores the aspect ratio and stretches an image to fill a fixed page, the result looks distorted - people appear too wide or too tall, and text in the photo becomes illegible. This tool calculates each image's aspect ratio automatically and scales it to fit your chosen page size and margins without ever distorting it. The image may have empty white space along one edge to preserve its proportions, but it will never be stretched or squished.

Understanding the difference between raster images and vector graphics helps explain why very large photos can make PDF files so large. A raster image (which includes all JPG, PNG, and WebP files) is made up of a fixed grid of colored pixels - sometimes millions of them. A 12-megapixel camera photo contains 12 million individual color dots. When you embed that raw data into a PDF without any processing, the resulting file can exceed 50 to 100 megabytes for just a few photos. To prevent this, this tool uses the browser's built-in Canvas API to redraw each image at a screen-optimized resolution before writing it into the PDF. If your original image is wider than 2048 pixels, it is proportionally scaled down to a more manageable size. The visual quality remains excellent for screen viewing and standard printing, while the file size stays practical for email attachments and shared drives.

You may have heard the term lossy compression when reading about JPG files. Compression is the process of mathematically reducing a file's size by discarding data the human eye is unlikely to notice. JPG uses lossy compression, meaning some original pixel data is permanently removed each time the file is saved. PNG, by contrast, uses lossless compression - every pixel is preserved exactly. When this tool processes your JPGs for the PDF, it renders them at a quality level that balances sharpness and file size. The images are not re-compressed aggressively - fine detail like handwriting and product labels remains sharp and readable.

Finally, it is worth understanding what client-side rendering means, because it is the technical reason this tool is so private. Most online file converters send your images to a remote server - a computer in a data center somewhere - where the actual PDF processing takes place. Your files travel across the internet, sit in someone else's server memory, and may be logged or stored before the result is sent back. This tool uses client-side rendering: all processing happens inside your own web browser using JavaScript and your computer's own processor and memory. Your images never leave your device. The jsPDF library loaded by this page creates the PDF binary structure directly in your browser's memory, and the download happens as a local file transfer - no network connection is involved in the actual conversion.

When you upload files to an external server to convert them, you are handing your data to a third party. For personal photos, identity documents, medical records, or confidential business scans, this creates real privacy risks - even if the service claims to delete files immediately. Data breaches, server logs, and overly broad terms of service can all put your files at risk without your knowledge.

This converter uses client-side rendering, which means the PDF is assembled entirely by the JavaScript engine running inside your browser. The jsPDF library, loaded from a public CDN, constructs the PDF binary format in your browser's working memory. When you click "Generate PDF," the download is triggered as a local Blob URL - a temporary in-memory file reference that is automatically destroyed when you close the tab. No file ever leaves your computer. This is the gold standard for private document processing.
After uploading your images, they appear as a grid of thumbnail cards in the Image Queue. Each card shows the image, a page number badge, the filename, and the file size. To change the page order, simply click and hold any thumbnail, drag it to a new position in the grid, then release. The page number badges update automatically to reflect the new sequence.

This drag-and-drop system is powered by SortableJS, a lightweight open-source library. You will notice the cursor changes to a grab hand when you hover over a thumbnail - this is a standard UI convention that signals the item is draggable. When you generate the PDF, the images are processed in exactly the order they appear in the queue from left to right, top to bottom.
Tip: You can also remove individual images by clicking the red X button on any thumbnail before generating. This is useful if you accidentally added the wrong file or want to exclude a page.
Yes, always. The aspect ratio - the proportional relationship between an image's width and height - is preserved for every image regardless of the page size or margin settings you choose.

Here is exactly how it works: when you select Fit to Image mode, each PDF page is created with dimensions that exactly match the image's pixel dimensions (converted to PDF points). The image fills the page perfectly because the page was built around it.

When you select A4 or US Letter mode, the tool calculates the maximum width and height available after subtracting your margin setting, then computes a single scale factor that makes the image as large as possible while fitting entirely within those bounds. If a portrait-oriented photo is placed on a landscape-oriented page, it will not be rotated or stretched - it will simply be centered with white space on the sides. Your images will always look exactly as they do in real life.
PDF file size is directly tied to the resolution and encoding of the embedded images. A modern smartphone takes photos at 10 to 50 megapixels. A 48-megapixel photo contains 48 million pixels, each storing color data. Embedded raw into a PDF without processing, a single photo can produce a 15-30 megabyte file. Multiply that across 10 or 20 photos and the result is an unusable 300 megabyte PDF.

This tool addresses that in two ways. First, it uses the HTML5 Canvas API to redraw images that exceed 2048 pixels in their longest dimension, scaling them down proportionally before writing them to the PDF. The threshold of 2048 pixels is well above what most screens display and what most printers need for high-quality output, so this reduction is invisible in practice.
Raster Images - any image made from a grid of pixels (JPG, PNG, WebP, BMP) - are stored in PDF files by embedding their pixel data. The more pixels, the larger the file.
Second, the jsPDF library uses JPEG re-encoding at a balanced quality level for each image embedded in the PDF, which applies lossy compression to reduce file size while retaining visual sharpness. The result is a PDF that is practical to email, upload to cloud storage, or print from any standard office printer.
This tool accepts three formats: JPG (JPEG), PNG, and WebP - which together cover virtually every photo, screenshot, or graphic you are likely to work with.

JPG (Joint Photographic Experts Group) is the most common format for photographs. It uses lossy compression, which means it discards some fine pixel-level detail to achieve smaller file sizes. JPG is ideal for photos and natural images where perfect pixel accuracy is not critical.

PNG (Portable Network Graphics) uses lossless compression, meaning no data is lost. PNG is preferred for screenshots, graphics with text, logos, and any image where hard edges and sharp detail must be preserved exactly. PNG files are typically larger than equivalent JPGs.

WebP is a modern format developed by Google that supports both lossy and lossless compression. It typically produces smaller files than JPG or PNG at equivalent quality, and is commonly used by websites to speed up page loading. If you save a screenshot from a modern web browser, it may save as a WebP file.
Tip: If you have a HEIC file from an iPhone, you will need to convert it to JPG first before using this tool. HEIC is Apple's proprietary format and is not yet universally supported by web browsers.
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Privacy First: This document compiler runs entirely locally in your web browser. Your images, personal photos, and sensitive data are never uploaded, stored, or transmitted to external servers.