Is this JPG to PDF converter completely free?
Yes, PurePDF is completely free with no hidden costs, no subscription tiers, and no per-file fees. There are no limits on how many images you can convert or how many times you can use the tool. You do not need to create an account or provide an email address. The tool is funded independently and will remain free forever. No ads are shown inside the converter itself, so your experience stays clean and focused.
Are my JPG images uploaded to a server when I convert them?
No — your images never leave your device. PurePDF runs entirely in your browser using the JavaScript Canvas API, which means all image reading, encoding, and PDF packaging happens locally in memory. There is no backend server involved in the conversion process at all. This architecture means your photos, screenshots, and documents remain completely private. You can even disconnect from the internet after the page loads and the converter will still work.
How many JPG images can I convert at once?
You can drop as many JPG files as you need in one batch — there is no enforced upper limit on quantity. Each image becomes one page in the output PDF, and images are placed in the order you arrange them. Very large batches with many high-resolution images may take longer depending on your device's RAM and CPU speed. For best performance with large batches, 20–50 images at a time is a good practical range. If you run into slowdowns, try converting in two or three smaller batches instead.
Will my image quality be preserved after conversion?
PurePDF uses 92% JPEG quality by default, which is visually indistinguishable from the original for most photographs and graphics. You can adjust the quality slider — increasing quality produces a larger file but preserves fine details, while decreasing quality reduces file size at the cost of some sharpness. The original image is never permanently altered; only the PDF output reflects your quality setting. For archival-quality conversions, use 100% quality. For email attachments or web sharing, 75–85% is usually more than adequate.
What page sizes can I choose for the output PDF?
PurePDF supports A4 (210 × 297mm), US Letter (8.5 × 11in), and Original — which sizes each page to exactly fit its source image with no cropping or scaling. A4 and Letter modes scale images proportionally to fit within the page margins. You can also adjust the margin size around each image. Choosing the right page size depends on your use case: A4 for European documents, Letter for US submissions, and Original if you want pixel-accurate image placement without any padding.
Can I control the order of images in the final PDF?
Yes. After dropping your images into the upload zone, a drag-and-drop grid lets you rearrange them in any order before conversion. Each image appears as a small preview thumbnail so you can visually confirm the sequence. Simply drag a thumbnail to its new position and the page order updates instantly. This is particularly useful when scanning multi-page documents page by page and then assembling them into a single ordered PDF.
Does PurePDF work on mobile devices?
Yes, PurePDF is fully responsive and works in modern mobile browsers including Safari on iOS and Chrome on Android. You can select images from your phone's camera roll or files app and convert them directly. The quality and output are identical to the desktop version. Keep in mind that very large images or large batches may be slower on mobile due to limited RAM compared to a desktop or laptop computer.
What is the maximum file size for each JPG image?
There is no server-side file size limit because processing happens entirely in your browser. The practical limit depends on your device's available memory — modern browsers can typically handle images up to 20–30 MB each without any issue. Very high-resolution images (for example 50+ megapixel camera raws exported as JPEG) may use significant memory when rendered to canvas. If you encounter a browser crash or slowdown, try reducing the image resolution before converting, or break the batch into smaller groups.
Can I add multiple JPGs to a single PDF or get separate PDFs?
By default, all selected JPG images are combined into a single multi-page PDF where each image becomes one page. There is no option to generate separate individual PDFs per image in one operation — the tool is designed around the multi-page workflow. If you need a separate PDF per image, simply convert them one at a time. Each single-image conversion takes only a few seconds and you can download each resulting PDF individually.
Does PurePDF work offline after the page has loaded?
Yes. Once the PurePDF page has fully loaded in your browser — meaning all JavaScript assets have been downloaded — the converter works without any internet connection. This makes it suitable for use on planes, in areas with poor connectivity, or when handling sensitive documents that should never be transmitted over a network. Simply open the page while connected once, then you can safely go offline and continue converting files as normal.