How to scan documents to a clear PDF with your phone

A phone camera can produce a scan good enough for most forms and applications, as long as the photo itself is good. Most rejected "scans" have the same few faults: shadows, tilted pages, or a file too big to upload. All of these are easy to avoid.

Taking a clear photo

1. Find even light. Daylight near a window is best. Overhead lights tend to throw the shadow of your hand and phone across the page, so move until the shadow falls away from the paper. Avoid the flash: it leaves a bright spot on glossy paper.
2. Lay the page flat on a dark, plain surface. A dark table makes the page's edges clear. Flatten any folds, and put something light on the corners if they curl.
3. Hold the phone straight above the page, parallel to it. Shooting at an angle makes the page look like a trapezium and blurs the far edge.
4. Fill the frame, but leave all four corners visible. Cutting off a corner can make an official document look incomplete.
5. Tap to focus and hold still. Before moving on, zoom in on the photo and check that the smallest text is readable. It only takes a few seconds, and it's much easier than rescanning later.

Building the PDF

• Keep the pages in order. Put them in sequence before you start photographing, and check the order again in the app before saving.
• Use one photo per page. Two pages squeezed into one photo come out small and hard to read.
• Check the front and back. For ID cards and two-sided forms, it's easy to forget the back.
• Give the file a useful name. "Rahul-Sharma-Rent-Agreement-2026.pdf" is easier for you and the recipient than "document.pdf".

When the file is too large

Forms and email often limit file size, and phone photos are large. Try these in order:

• Leave out blank pages and anything nobody asked for.
• Reduce your phone camera's resolution setting before taking the photos, as a normal document doesn't need the highest setting.
• If you have only a little too much, split the document into two PDFs if the form allows several uploads.

Our PDF Maker takes up to 30 pages in one PDF, and it shows you the size of the finished file so you know before you upload it.

Keeping private documents private

Aadhaar cards, PAN cards, bank statements and medical papers can all be misused. A few precautions are worth taking:

• Be careful with free online converters. Many upload your files to someone else's server. Prefer a tool that works on your phone. Our PDF Maker runs on your device, and your photos aren't uploaded anywhere.
• Share only what's needed. Where a masked Aadhaar is accepted (one that shows only the last four digits), use that instead of the full number.
• Consider marking the purpose. When you hand over an ID copy, writing something like "For KYC at ABC Bank only, 2 November 2026" across it makes misuse harder. Keep it clear of the details, and check first if an office has its own rules about this.
• Tidy up afterwards. Delete the photos and PDF from your phone, and from WhatsApp chats, when you no longer need them. They may also have been backed up to your cloud storage.

Some offices have specific rules on scan quality, size or format, so check the requirements of the form you're filling in. Some bodies accept only documents scanned in a set way or certified copies, which a phone scan can't replace.