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Sometimes the document you need to submit does not exist as a document yet — it is a handful of photos on your phone. Receipts, ID pages, signed forms, whiteboard notes and photographed paperwork all start life as images, and most organisations will only accept them as a single PDF.
Converting images to PDF is simple, but a few choices decide whether the result looks professional or like a hurried phone gallery.
Key takeaways
- PDF keeps multiple images together as one ordered, printable file.
- Use A4 or Letter for official paperwork; Fit for photos you just want to keep as-is.
- PDF quality is decided by the source images — photograph pages straight and well-lit.
- Resize oversized phone photos first so your PDF does not balloon in size.
Why PDF is usually the right target
A PDF keeps multiple images together as one file, in a fixed page order, at a size that prints consistently. That makes it the format of choice for anything that needs to be submitted, archived or emailed as a complete record.
It also plays nicely with the rest of the toolchain: once your images are a PDF you can compress it, add page numbers, merge it with other documents or protect it with a password.
How to convert images to a PDF
The free web tool handles the common formats — JPG, PNG, GIF and WebP:
- Open the Images to PDF tool.
- Select your images. You can add several at once.
- Arrange them in the order you want the pages to appear.
- Choose a page size: Fit keeps each image at its natural proportions, while A4 or Letter gives every page a consistent document size.
- Generate the PDF and download it.
Choose the right page size
The page-size setting matters more than people expect. Fit is convenient for photos because nothing is cropped or stretched, but the pages end up whatever shape the images are. A4 or Letter normalises every page to a standard sheet, which looks tidier for forms and print.
If you plan to print the result or submit it as official paperwork, A4 or Letter is usually the safer choice.
Avoid the blurry-print trap
The quality of the PDF is set by the images you put in, not by the conversion. A low-resolution photo will still look soft once it is a PDF.
For documents you intend to read or print, photograph each page straight-on in good, even light, fill the frame, and keep the camera still. If an image is enormous — a modern phone photo can be many megapixels — you can use Resize Image first so the PDF does not become needlessly heavy.
If your photos are in an awkward format, Convert Image can switch them to JPG or PNG, and PDF to JPG does the opposite when you need to turn pages back into pictures.
Turning a photo of a document into usable text
If what you actually need is the words on the page rather than a tidy PDF, converting the image and running OCR will give you searchable text. That is the step that turns a photographed letter into something you can copy, search and edit — worth remembering if your end goal is text, not a document.
Frequently asked questions
Which image formats can I convert to PDF?
The web tool accepts common formats including JPG, PNG, GIF and WebP. If you have a HEIC photo from an iPhone, convert it to JPG first with the Convert Image tool.
Can I combine images and existing PDFs into one file?
Yes, in two steps: convert the images to a PDF with this tool, then merge that PDF with your other documents using Merge PDFs.
Will my images be stretched or cropped?
With the Fit option, each image keeps its natural proportions. Choosing A4 or Letter fits images onto standard pages and may add small margins, which is usually what you want for printing.
How do I make the PDF file smaller?
Resize or convert the source images first, or run the finished PDF through Compress PDF. Large photos are almost always the reason a converted PDF is heavy.
Tools mentioned in this guide
Related guides
CompressionHow to compress a PDF without losing quality
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OCRHow to make a scanned PDF searchable
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