Do you want to turn gallery photos into one PDF on your Android phone?

The best way to convert images to PDF on your phone depends on whether you already have photos saved, need to scan paper, or want several pictures in one file. These Android options cover those different jobs.

A photo to PDF app can help with a receipt, a signed page, class notes or a form you need to send. But “scan to PDF” and “convert an existing image to PDF” are not always the same feature. Some apps photograph paper with the camera; others let you pick pictures already in your gallery. Here is how to choose without installing a pile of apps.

Quick picks

• For importing existing document photos and making searchable PDFs, Adobe Scan is a strong starting point.
• For scanning paper straight into Google storage, Google Drive is convenient if you already use it.
• For selecting existing pictures and saving them as a PDF, Microsoft 365 Copilot for Android documents a direct Pictures to PDF action.
• For extra PDF tools in one place, Smallpdf offers scanning and later conversion or organization tools, but check which features need an account or paid plan in your version.

Adobe Scan: turn gallery photos into a document PDF

Adobe Scan is useful when your image is really a document: a receipt, form, letter or note. Adobe’s Android guide says you can select one or more existing pictures, optionally show only likely documents, adjust the crop, and save the result as a PDF. It can also detect document edges, clean the image and recognize text with OCR, so the finished file can be searchable.

Open Adobe Scan, choose the option to add a photo or document, select the images, review the crop and order, then tap Save PDF. Check the pages before saving. Auto crop can remove a signature, a page number or a stamp near the edge, so correct the corners if needed. Adobe says scans are saved to Adobe cloud storage; use its export or sharing options if you need a copy somewhere else.

This is a good fit for paperwork that should look like a clean scan rather than a full page photograph. It is less suitable if you want every image preserved exactly as shot, because the app is designed to detect and improve documents. Read Adobe’s Android scanning guide for its photo import and Save PDF steps.

Google Drive: scan paper into a searchable PDF

Google Drive is handy when you are starting with a physical page and want the PDF to land in your Drive account. Google’s help page documents scanning receipts, letters and billing statements in the Android app and saving them as searchable PDFs. Open Drive, tap the camera or scan control, capture the page, review it, and save it to the folder you want.

Drive is not the clearest choice when your source is a photo that is already in your gallery. Its documented workflow is a camera scan, so do not assume it has the same photo picker conversion flow as a dedicated image to PDF tool. If you only need to digitise paper and already share files through Drive, it keeps capture, storage and sharing together.

For a step by step walkthrough, see our guide to scanning and saving documents with the Google Drive app on Android. It covers lighting, framing, saving and finding the scan later.

Microsoft 365 Copilot: use Pictures to PDF

Microsoft’s Android help describes a direct Pictures to PDF action: choose one or more pictures, tap Next, then Done to complete the conversion, and Share if you want to send the file. The same app also documents Scan to PDF, where you take a picture or choose one from Gallery and save the PDF where you want.

That makes Microsoft 365 Copilot a useful option when you need a straightforward gallery to PDF route rather than only a camera scanner. Button names can move as the app changes, so update the app and look under Actions if the steps differ on your phone. Before sharing, open the finished PDF and check that every selected picture appears in the right order.

Microsoft’s Android Actions guide lists both Pictures to PDF and Scan to PDF.

Smallpdf: for a wider PDF workflow

Smallpdf’s mobile scanner can capture a paper page, crop or rotate it, apply a filter and finish a PDF. Its published guide also describes saving scans on the phone or syncing them with an account, and using tools to merge, compress or convert documents later. That broader toolkit can help if creating the PDF is only one part of the job.

Check the current app screen before you rely on gallery import, cloud syncing or a premium tool. App features and account requirements can change, and the available options may depend on your version. Smallpdf’s PDF scanner guide explains its mobile scanning flow and follow up PDF tools.

How to choose the right app

Start with the source. If you have loose paper, choose a scanner that captures with the camera, detects page edges and saves cleanly. If the image is already in Photos or Gallery, confirm that the app has an import or picture selection option before you install it. “Scan to PDF” in an app description does not automatically mean it can convert existing gallery pictures.

Next, think about the finished file. For one image, almost any converter can be enough. For several pages, look for multi page support, page reordering and a preview before saving. If you need to search for words later, check for OCR. A PDF made from images may simply contain page pictures unless the app recognizes the text.

Finally, consider where the file goes. Google Drive and Adobe Scan are convenient when you want cloud access, but sensitive documents deserve extra care. Review the app’s permissions and privacy information, and avoid uploading identity documents to a service unless you understand its storage and sharing settings. If you only need a local copy, choose an app that clearly lets you save to device storage and verify the file appears in your Files app.

Make a cleaner PDF from your phone

Good light and a flat page make a bigger difference than a fancy filter. Keep the phone parallel to the page, include all four corners, and check the preview for shadows, blur and missing edges. For several pictures, put them in the order you want before creating the PDF. Use a clear filename so you can find it later, then open the saved file once to confirm it is readable and not upside down.

If the PDF is too large to send, use a compression option only after checking that small text remains legible. Avoid sending a link with public access when a private file attachment or restricted sharing link will do. The safest workflow is the one that gets the document into the right format without exposing more of it than necessary.

Which one should you use?

Choose Adobe Scan for importing document photos, cleaning them up and adding searchable text. Choose Google Drive when you are scanning paper and want the file saved in Drive. Choose Microsoft 365 Copilot when you want its documented Pictures to PDF action for gallery images. Consider Smallpdf when you also need a broader set of PDF tools. In every case, preview the PDF before you send it, especially when it contains a signature, ID number or other private detail.