How to Scan Documents with Your Phone and Combine Into One PDF

To scan documents with your phone, use the built-in scanner (Notes or Files on iPhone, Google Drive or the camera's document mode on Android), or simply take clear photos of each page. Then combine the pages into one PDF with a tool like image to PDF and, if needed, shrink it with compress PDF to 200 KB. The whole job takes a few minutes and works without a scanner.

Option 1: Use your phone's built-in scanner

iPhone

1. Open the Notes app and create a new note (or open Files).
2. Tap the camera or attachment icon and choose Scan Documents. In Files, tap the three-dot menu and choose Scan Documents.
3. Hold the phone over the page. It detects edges and captures automatically, or you can tap the shutter.
4. Scan each page in order, then tap Save.
5. Share or save the result as a PDF.

Android

1. Open Google Drive, tap the + (or New) button, then Scan.
2. Capture each page; adjust the crop if the edges are off.
3. Tap + to add more pages, then Save to create a PDF.

Some Android phones also have a document mode in the camera app, or a scanner in the Files or Notes app. The steps are similar.

Built-in scanners correct the perspective and boost contrast, which makes text cleaner and files smaller. If yours does not let you control the file size, that is fine; you can compress it afterwards.

Option 2: Take photos and convert them in the browser

If you prefer not to use a cloud app, or you already have photos of the pages:

1. Take a photo of each page (tips below).
2. Crop away the background if needed with crop image.
3. Open image to PDF in your phone's browser, select all the page photos, and put them in the right order.
4. Choose the page size (A4 is standard for Indian documents) and create the PDF.
5. Download it, and compress if the portal has a size limit.

The image to PDF tool accepts JPG, PNG, WebP and iPhone HEIC photos, and it runs in your browser, so your documents are not uploaded.

Tips for clean scans

• Light: Daylight near a window is best. Avoid direct sun and turn off the flash to prevent glare.
• Background: Place the page on a dark, plain surface so edges are easy to detect.
• Angle: Hold the phone directly above the page, parallel to it. Tilting creates a keystone shape and blurs one end.
• Focus: Tap on the text before capturing. Hold still for a moment.
• Flatten: Press folded certificates under a book first, or hold the corners down.
• Fill the frame: Get close enough that the page nearly fills the screen, without cutting off edges.
• One page per shot. Two pages in one photo makes small, hard-to-read text.

Combining multiple files into one PDF

Sometimes pages arrive in different forms: a scanned PDF of your marksheet, photos of a certificate, and a downloaded PDF of a form.

1. Convert any photos to PDF with image to PDF.
2. Combine all the PDFs with merge PDF.
3. Fix the order or remove extra pages with organize PDF. This is also where you can rotate a sideways page.
4. Compress the final file once, at the end.

Compressing once at the end gives better quality than compressing each piece and then merging.

Getting the size right

Portals often cap uploads at 100 KB, 200 KB, 500 KB or 1 MB. A phone scan of a single page can easily be 1–3 MB, so compression is usually needed. Use compress PDF to 200 KB or the matching target size, then open the result and zoom in on names, numbers and seals to make sure they are still readable.

If a multi-page document will not get small enough, check whether the portal accepts each page separately, or scan in greyscale, which saves a lot of space.

Scanning ID cards and two-sided documents

Small cards like Aadhaar, PAN or a college ID are often needed front and back on a single page. Photograph each side separately, crop each tightly, then add both images to image to PDF as two pages. If a form insists on both sides on one page, the simplest route is to lay the card's front and back side by side on the table and photograph them together. For certificates printed on both sides, scan the front, then the back, and check the order before saving. Keep the card on a dark surface so its rounded edges are easy to crop.

Naming and storing your scans

Give each file a clear name like class12_marksheet.pdf or caste_certificate_2026.pdf. Avoid spaces and special characters, which some portals reject. Keep originals in a folder on your phone or computer so you can make new copies at different sizes for different forms without scanning again.

Common mistakes

• Pages out of order, especially two-sided certificates. Check before you save.
• Shadows of your hand or phone across the page. Move the light source or change your angle.
• Cut-off edges where a seal or signature sits. Leave a small margin.
• Uploading a photo when the form wants a PDF, or the reverse. Read the format requirement.
• Over-compressing until stamps and small print are unreadable.
• Scanning a coloured certificate in black and white when the portal asks for colour. Greyscale is fine only if colour is not required.

A phone, good light and a couple of minutes is all it takes to produce a scan that most online forms will accept.

Questions