How to convert
Drop your images on the box, or click to browse. They queue up in the order they arrive.
Reordering has three routes. Drag a row up or down, use the arrow buttons on the right, or open the magnifier and move the image from inside the full-size view. That last one earns its place, because the list thumbnail is about 52 pixels tall and that is nowhere near enough to tell page 4 of a handwritten set from page 7.
Then set page size, orientation and margin, and press Create PDF. The file arrives as images.pdf.
Fit to image is bigger than you think
This is the setting most people leave alone, and it quietly produces enormous pages.
A PDF does not measure pages in pixels. It measures them in points, and there are exactly 72 points to an inch. Fit to image takes the pixel dimensions of your photo and uses them as point dimensions, one for one. So an ordinary 12 megapixel phone photo, 4032 by 3024 pixels, becomes a page 56 inches wide and 42 inches tall. Acrobat will open that quite happily. Your printer will not.
| Source image | Fit to image page | For comparison |
|---|---|---|
| 4032 x 3024 (12 MP phone) | 56 x 42 in | A4 is 8.3 x 11.7 in |
| 1920 x 1080 screenshot | 26.7 x 15 in | Letter is 8.5 x 11 in |
| 2480 x 3508 (A4 scanned at 300 dpi) | 34.4 x 48.7 in | A0 is 33.1 x 46.8 in |
| 25326 x 6609 (iPhone panorama) | 351.8 x 91.8 in | past the ceiling, see below |
There is a hard ceiling as well. Adobe's implementation limits set the largest page at 14,400 by 14,400 units, which works out at 200 by 200 inches (PDF Reference 1.7, Appendix C). PDF 1.6 added a UserUnit entry to get around it, but the library behind this tool never writes one. An iPhone panorama can reach 63 megapixels, and one measured example runs 25,326 pixels wide, so Fit to image on a panorama makes a page that Acrobat flags as out of range.
The fix is dull and it works. Pick A4 or US Letter instead. A4 is fixed at 595.28 by 841.89 points, Letter at 612 by 792, and your image is scaled down to sit inside whichever you chose, centred, with its proportions kept.
Orientation and margins
Auto orientation checks each image and turns that page landscape when the photo is wider than it is tall. Portrait and Landscape override it for every page in the document.
Margins use the same 72-to-the-inch scale. None is zero. Small is 18 points, a quarter of an inch. Medium is 36 points, half an inch. Anything headed for a home printer wants Small at the very least, since most consumer inkjets cannot print to the paper edge and will clip whatever sits in that strip.
What happens to file size
JPG files pass through untouched. The original bytes go straight into the PDF as a DCTDecode stream, so nothing is recompressed and no quality is lost. Ten photos of 2 MB each give you a PDF of roughly 20 MB.
WebP, GIF, BMP and AVIF cannot go in that way. Each one is redrawn on a canvas and re-encoded as PNG first, and PNG is lossless, so a photo that was 400 KB as a WebP can land several times larger inside the PDF.Convert those to JPG first if size is tight.
When this is the right tool
- Application forms and upload portals that want one PDF and reject a folder of loose photos.
- Receipts and invoices gathered into a single expense claim.
- Whiteboards, lecture notes and handwritten pages photographed and filed properly.
- ID documents with the front and the back on consecutive pages.
Frequently asked questions
How do I convert a JPG to PDF for free?
Add your images, set the order, choose a page size, then press Create PDF. It is free, with no sign-up and no watermark, and the download is named images.pdf.
Which page size should I choose?
A4 or US Letter whenever the PDF will be printed or uploaded somewhere. Fit to image only when you want each photo at its own proportions and nobody is going to print it.
Which image formats can I use?
JPG, PNG, WebP, GIF, BMP and AVIF. JPG and PNG go in as they are. The rest are converted to PNG on the way through.
Can I change the page order after adding the files?
Yes, and there are three ways to do it: drag the rows, use the arrow buttons, or move an image while you have it open at full size.
Why is my PDF almost as large as the photos were?
Because your JPGs went in unchanged, which is the point. Shrink the images before you build the PDF if the total is a problem.
Will the text in my scans be searchable?
No. Every page is a picture, so there is no text layer to search or select. You would need OCR after the fact for that.
Related: convert HEIC to JPG first, compress images before building the PDF, or turn a PDF back into images.