Turning phone photos and scans into a clean PDF

You do not need a scanner to turn paper into a tidy PDF. A phone camera and a little care produce documents that are perfectly fine for applications, expense claims, landlords and insurance companies. The difference between a clean result and an unreadable one is mostly in how you take the photos and what you do with them afterwards.

Capturing good photos

Most problems with "scanned" documents start at the moment the photo is taken. Fixing them later is hard, so get these basics right.

Light

• Use even, bright light. Daylight near a window, without direct sun on the page, works well.
• Avoid the flash. It creates a bright hotspot in the middle and a dark border, and glossy paper reflects it.
• Watch out for your own shadow. Overhead lamps behind you cast the shadow of your phone and hands onto the page. Move so the light comes from the side or in front.

Flat paper

• Lay the page on a flat surface. Folded letters curl; press them flat under a book for a few minutes first, or hold the edges down outside the frame.
• For bound documents such as booklets, press near the spine so the lines do not bend.
• Use a plain, contrasting background: a dark table under white paper makes the edges easy to see and to crop.

Angle and framing

• Hold the phone directly above the page, parallel to it. Shooting at an angle turns a rectangle into a trapezoid, and text at the far end becomes small and soft.
• Fill the frame with the page, leaving a small margin so no text is cut off.
• Tap the screen on the text to focus, hold still, and check the photo is sharp by zooming in before moving on.

Contrast and colour

Many phone camera apps and built-in document scanning modes can detect the page edges, straighten the perspective and boost contrast so the paper looks white and the text black. If your phone has such a mode, it is usually worth using. For documents with colour that matters, such as stamps, highlights or photos, keep colour; for plain text, a high-contrast or greyscale version is often more readable and smaller.

Crop before you convert

Whatever is in the photo ends up on the PDF page: the table, your fingers, the edge of a keyboard. Crop each image to the paper in your phone's photo editor before converting. A cropped image also gives a page with sensible proportions, closer to the real document.

From JPG and PNG to PDF

Phone photos are usually JPG files (some phones use other formats by default; if a tool rejects your photos, check your camera settings or export as JPG). Screenshots are typically PNG. Converting them to PDF puts each image on its own page, giving you one file to send instead of a pile of pictures.

• JPG suits photos of documents and is compact.
• PNG is lossless and suits screenshots and computer graphics, but large PNG photos can be heavy.

Good converters embed JPGs as they are, without compressing them again, so no extra quality is lost in the conversion itself.

Getting the page order right

Photos are often converted in the order they were selected or uploaded, which may follow their file names or the time they were taken. If you photographed page 3 before page 2, the PDF will be wrong unless you fix the order. Simple ways to stay in control:

• Photograph pages in order, one document at a time.
• Rename photos before uploading if your phone gives them cryptic names (01.jpg, 02.jpg and so on).
• Check the order in a preview before you create the PDF and drag pages into place if needed.

Combining photos with existing PDFs is covered in how to merge PDF files in the right order.

Rotating sideways pages

Phones decide orientation using a motion sensor, and when you hold the phone flat above a table it can easily guess wrong. The result: pages lying on their side or upside down. Rotate them before sending. In a PDF, rotation can be stored as a page setting, which is lossless: the image is not re-compressed, only displayed turned. Keep genuinely landscape documents in landscape, as long as the text reads normally.

Removing blank and unwanted pages

When scanning double-sided documents with a scanner, or when photos include a test shot, you often end up with blank backs, duplicates or blurry retakes. Delete these. They make the document longer, larger and look careless. Scroll through the whole PDF once and remove anything the reader does not need.

Compressing scans

Here is where scans differ most from typed documents. Every page is a photograph, and modern phone cameras produce images of 12 megapixels or more, often several megabytes each. A 10-page document can easily reach 30 MB or more, too big for many e-mail services and most upload forms.

Compression helps a lot with scans, because it lowers the resolution of the page images. A level that keeps images around 150 DPI is usually still comfortably readable on screen and on an office printer, while making the file far smaller. Strong compression (around 72 DPI) shrinks it further but can make small print and signatures hard to read. Check the result at 100% zoom before sending. Our guide on reducing PDF file size goes into the details.

The big limitation: scans are images

A PDF made from photos or scans looks like a document, but to a computer each page is just a picture. That means:

• You cannot select or copy the text.
• Searching the PDF for a word finds nothing.
• Screen readers used by blind and partially sighted people cannot read it aloud.
• You cannot edit the text, only replace whole pages.

The technology that converts images of text into real text is called OCR (optical character recognition). It is available in various desktop programs, scanner software and some phone apps, and it works best on sharp, straight, high-contrast images, which is one more reason to take good photos. OCR is not perfect: check important numbers and names afterwards. If you only need a searchable archive, a scanner app with built-in OCR may be the most convenient route.

A quick checklist

1. Even light, no flash, no shadows.
2. Paper flat, phone parallel, page fills the frame.
3. Photos sharp and cropped.
4. Pages in the right order and upright.
5. Blank pages and retakes removed.
6. File compressed to a sensible size and checked for readability.
7. A clear file name, such as 2026-10-lease-agreement-signed.pdf.

Doing it on FlexyFiles

FlexyFiles works in a phone browser, with tabs for Files, Preview and Processing, so you can do all of this right after taking the photos.

1. Open Merge PDF and upload your JPG or PNG photos (you can add existing PDFs too). In a merge, each image becomes one page.
2. In the "Processing" panel, drag the items into the right order, rotate any that are sideways and remove retakes.
3. Enter a name under "Save as" and click Run. The single combined PDF appears in "Your files", ready to download.

JPG to PDF does the same in one click: it puts your photos in a single PDF, one image per page, each page taking the image's proportions (the long edge matches A4 height), and JPGs are embedded without re-compression. If you would rather have each photo as its own PDF, open the full workspace, add the photos to Processing and press Run without a Merge step: the results are numbered (name-1, name-2 and so on).

For a PDF you already have, fix orientation with Rotate PDF and drop blank pages with Delete pages. In the full workspace at /pdf/app, you can chain steps, for example Merge, then Compress with the "Recommended" level, and get one finished, e-mail-friendly file. FlexyFiles does not offer OCR, so the resulting PDF contains images of your pages, not searchable text.