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How to Turn Photos into a PDF on Android

How to turn photos and images into a PDF on Android: choosing and ordering images, JPEG versus PNG, page size and orientation, and keeping the file small.

By Published 4 min read

Reign Creative LLC makes PDF All in One Tool No Limit, which this article links to, so we have a commercial interest in it. How we write and check articles.

AI-assisted article. Drafted with AI tools from the sources cited below and checked by automated tests and an AI editorial review. No person has reviewed it yet. How we write and check articles.

Key takeaways

  • Converting images to a PDF places each image on its own page, in the order you choose.
  • JPEG suits photographs; Wikipedia notes it is poorly suited to line drawings and text, where sharp edges show artefacts.
  • PNG compresses losslessly, which keeps screenshots and diagrams crisp; Wikipedia notes JPEG can produce smaller files than PNG for photographs.
  • A 12-megapixel photo per page quickly adds up, so resize or compress image-heavy PDFs before sending.
  • For paper documents, a document scanner adds cropping, filters and clean-up tools that an ordinary photo does not have.

Photos are how information arrives on a phone: a picture of a whiteboard, screenshots of a booking, a set of receipts, a handwritten assignment. Turning them into one PDF makes them easier to send, print and keep together. This guide covers the conversion on Android, the image formats involved and how to avoid a PDF that is far too big.

What conversion does

Converting images to a PDF places each image on its own page, in the order you set, inside one file. Nothing about the images needs to change, although some apps let you pick a page size, orientation or margins. PDF All in One Tool No Limit can create PDFs from images, photos, text and other supported files. Menus and options differ between apps and app versions, so the steps below describe the decisions rather than exact buttons.

Step by step

  1. Choose the images you need, and skip near-duplicates.
  2. Put them in order before converting: chronological for receipts, page order for notes.
  3. Rotate any sideways images so every page reads the right way up.
  4. Pick page settings if offered: fit to page, and portrait or landscape to match the images.
  5. Create the PDF, then scroll through every page.
  6. Rename it with a date and description, and compress if it needs to be emailed.

JPEG or PNG?

Wikipedia notes that JPEG/Exif is the most common format saved by digital cameras; screenshots may be saved as PNG, depending on the device, so check the file extension. The difference matters for quality and size:

JPEG PNG
Compression Lossy Lossless
Best for Photographs, scenes with smooth tones Screenshots, diagrams, text, line art
Weakness Artefacts around sharp edges and text Large files for photographs

Wikipedia explains that JPEG works best on photographs and paintings of realistic scenes with smooth variations of tone and colour. It adds that JPEG is not well suited to line drawings and other textual or iconic graphics, where sharp contrasts between adjacent pixels cause noticeable artefacts, and that such images are better saved in a lossless format such as PNG. PNG, Wikipedia notes, is a raster format with lossless compression, developed as an improved, non-patented replacement for GIF.

The practical rule: keep photos as JPEG and screenshots or diagrams as PNG. Converting a screenshot to JPEG before making a PDF can blur its text.

A worked example: how big will it be?

You convert ten photos from a 12-megapixel camera, each about 4,000 × 3,000 pixels, into a PDF. That is roughly 120 million pixels of image data. Even with JPEG compression, which Wikipedia says typically achieves about 10:1, a set like this can run to tens of megabytes. For on-screen reading, a letter-size page at 150 pixels per inch needs only 1,275 × 1,650 pixels, about 2.1 megapixels, so the photos carry about six times more pixels per page than the screen needs. Compressing the finished PDF, or resizing the photos first, brings it down; how to compress a PDF explains the trade-offs.

Photos of documents: scan instead

If the images are of paper documents, a document scanner gives you more control than the camera app. Google's help for the Google Drive scanner describes what it adds: an outline around the document showing where it will be cropped, crop and rotate tools, colour and greyscale filters and a clean-up tool for stains and fingers, with the result saved as a PDF or JPG. Screens and labels can differ by device and app version. Scanning documents to PDF covers getting a clean capture.

Screenshots to PDF

Screenshots are another case: a ticket, a confirmation, a chat that needs saving. Keep them as PNG, crop away status bars and keyboards before converting, and put them in time order. A short PDF of five tidy screenshots is easier to forward and file than five loose images.

Check the edges before you share

Photos can capture more than you meant to: another document on the desk, a reflection in a window, a name on an envelope, or a notification banner at the top of a screenshot. Before converting, crop each image to what the recipient needs. It takes a few seconds per photo, and it is much easier than recalling a PDF that has already been sent. The same applies to photo order: a quick scroll through the finished PDF catches the stray holiday photo that slipped into a set of receipts.

Combining with existing PDFs

If the images belong with an existing document, such as photos of receipts with an expense form, create the image PDF first, then merge the two; merging PDFs on Android covers ordering and checking the result.

PDF All in One Tool No Limit is one of our video and utility apps; its guide maps its other tools.

Good to know

Frequently asked questions

How do you combine several pictures into one PDF on Android?
Open a PDF app's create-from-images tool, select the photos, arrange them in the order you want, choose page size and orientation if offered, then create the PDF and check each page before saving. Tool names and screens differ between apps and Android versions.
Is JPEG or PNG better for images in a PDF?
It depends on the image. Wikipedia notes JPEG works best on photographs with smooth tones but is not well suited to line drawings and text, where it creates artefacts. PNG is lossless, so it keeps screenshots, diagrams and text sharp.
Why is a PDF made from photos so large?
Because each page holds a full photo. A 12-megapixel image has about 12 million pixels; ten of them in one PDF is a lot of data. Compressing the PDF, or resizing photos first, reduces the size.
Should I photograph or scan a paper document?
Scan it if you can. Google's help for the Google Drive scanner on Android describes an outline showing where the photo will be cropped, crop and rotate tools, colour and greyscale filters and a clean-up tool, none of which an ordinary photo gives you.

Sources

  1. JPEG (opens in a new tab)Wikipedia — accessed
  2. PNG (opens in a new tab)Wikipedia — accessed
  3. Scan documents with Google Drive (Android) (opens in a new tab)Google Drive Help — accessed

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