Photographs of a signed contract, a stack of receipts, a passport page for an application — sending twelve loose image files is awkward and looks it. Upload your JPGs or PNGs above and get one PDF with a page per image, in the order you choose.
Below: how to get the order right, why a scanned document is usually the wrong thing to send as images, and what to do about page size and orientation.
The most common complaint about any image-to-PDF tool is that the pages came out shuffled, and the cause is almost always file naming.
Computers sort file names as text rather than numbers. A folder containing 1.jpg, 2.jpg and 10.jpg sorts them as 1, 10, 2 — because "10" begins with the character "1", which comes before "2". Select all and convert, and page 10 lands second.
Zero-padding fixes it. Rename them 01.jpg, 02.jpg, 10.jpg and text sorting matches numeric sorting exactly. For more than 99 files, pad to three digits.
Phone photos are usually fine as they are, since camera filenames like IMG_4471 already use a fixed number of digits and sort correctly. The problem is mostly with files you have renamed yourself.
Where the tool lets you drag pages into position, that is quicker than renaming — and you can see what you are arranging.
Most people converting images to PDF are photographing paper, not assembling a portfolio. A few minutes of care makes the result look like a scan rather than a snapshot.
Most phones now have a document scanning mode built into the camera or notes app, which handles perspective correction and contrast automatically. If you are photographing paper regularly, it is worth finding.
Worth being clear about, because it catches people out at exactly the wrong moment.
A PDF made from photographs contains pictures of pages. There is no text inside it — nothing to search, nothing to select, nothing to copy. Send it to an organisation that needs to process it and their systems may not be able to read a word.
If the document needs to be searchable, run the finished PDF through OCR PDF. That adds an invisible text layer behind the images, so the pages look exactly as photographed and Ctrl+F starts working. It is also what makes the document readable by a screen reader, which a plain image PDF is not at all.
For anything official — a benefits claim, a visa application, a legal filing — this step is worth taking.
Three practical points.
Aspect ratio never quite matches. A phone photo is 4:3 or 3:4; an A4 page is roughly 1:1.41. Something has to give — either the image fits inside the page with margins, or it fills the page and the edges are cropped. Cropping your photos to something close to page proportions before converting gives you control over which.
Mixed orientations look untidy. A set where some photos are portrait and some landscape produces a PDF the reader has to keep rotating. Rotate them consistently before converting.
Photographs make large PDFs. Twenty phone photos at four megabytes each produce an eighty-megabyte file — over most email limits and slow to open. Compress the images first, or run the finished PDF through Compress PDF. Around 2000 pixels on the long edge is plenty for a readable document page.
OCR PDF makes the finished document searchable, Compress PDF shrinks it for email, HEIC to JPG converts iPhone photos first, and Merge PDF combines the result with other documents. Browse all PDF tools.