How to Scan Documents With Your Phone (Clean, Small PDFs)
Both Android and iPhone can scan documents without a separate app: use the camera icon inside Google Drive on Android, or Scan Documents inside the Notes app on iPhone. Either way, you get a straightened, cropped page saved as an image or PDF, which you can then compress and merge into one clean file before uploading.
You do not need a separate scanning app on either Android or iPhone. On Android, open the Google Drive app, tap the camera icon, and point it at the document; on iPhone, open the Notes app, tap the attachment button and choose Scan Documents. Both features automatically detect the page edges, straighten the image and let you add more pages before saving the result as a clean, cropped file.
Scanning on Android with Google Drive
- Open the Google Drive app and tap Camera at the bottom right.
- Point your camera at the document.
- Tap the shutter to capture, or switch to Auto capture so it fires automatically once the page is steady.
- Use the on-screen tools to crop, rotate, adjust colour or clean stains and finger marks from the scan.
- Tap Add to scan another page into the same file, then tap Done.
- Type a file name, choose .pdf (or .jpg) as the format, and tap Save to store it in Drive.
Scanning on iPhone with Notes
- Open the Notes app and create a new note, or open an existing one.
- Tap the Attachment button, then tap Scan Documents.
- Hold the iPhone so the document fills the frame; it captures automatically once the page boundary is detected, or tap the shutter button to capture manually.
- Drag the corner handles if the automatic crop misses part of the page, then tap Keep Scan.
- Repeat for additional pages, then tap Done.
- Share the scan from Notes as a PDF using the share sheet, or export it directly from the note.
Once you have the scan, turn multiple photos into one ordered PDF with image to PDF, then shrink it to fit an upload limit with compress PDF.
Image to PDF
Same settings as the full tool page.
Runs in your browser. Your file never leaves your device. Open the full Image to PDF page
Why a phone scan can look worse than the original document
A scan taken in poor light, at an angle, or with a shadow falling across the page often looks patchy or grey rather than clean white, even if the built-in scanner straightens the perspective correctly. Most of these problems come from lighting, not the scanning app itself: use even daylight or a bright room light directly above the document, avoid your own shadow falling across the page, and place the document on a plain, contrasting surface so the edge-detection step works cleanly.
If a scan still looks dim or yellowish after capture, most built-in scanners offer a black-and-white or high-contrast filter option in the editing step, which often makes text-only documents look far closer to a genuine scan than the original colour photo.
Turning several scans into one small PDF
Government and job portals frequently ask for a single PDF rather than several separate image files, and they often cap the file size at a few hundred KB or a couple of MB. After scanning each page with your phone's built-in tool, combine the images into one PDF with an image-to-PDF converter, then run the result through a PDF compressor if it is still too large. Compressing after combining, rather than compressing each photo first, usually gives a cleaner result, since the PDF compressor can optimise the whole document together.
When a third-party scanner app is worth using instead
The built-in tools cover most everyday needs, but a dedicated scanning app can help if you regularly scan long, multi-page documents, need automatic text recognition (OCR) to make the scan searchable, or want batch scanning with less manual cropping between pages. For an occasional certificate, form or ID card, though, the built-in Google Drive or Notes scanner is usually enough, and it avoids installing an app you will rarely open. If your document needs to be searchable text rather than just an image of text, run the finished scan through an OCR tool afterwards rather than relying on the scanner app alone, since not every built-in scanner extracts text automatically.
Saving and finding your scan again later
On Android, a Drive scan is saved to your Google Drive account by default, so it stays available even if you switch phones, but check which folder it landed in if you have several. On iPhone, a Notes scan lives inside that specific note until you export it, so export important scans as a PDF to your Files app or share them to yourself soon after scanning, rather than leaving them buried in a note you might delete later.
Common mistakes when scanning with a phone
- Taking a normal camera photo of the document instead of using the dedicated scan feature, which skips the automatic straightening and cropping.
- Scanning multiple separate pages as separate PDF files, then struggling to combine them for a single upload field.
- Scanning in dim light and then trying to fix the result entirely with compression settings, rather than rescanning in better light.
- Forgetting to crop out background clutter around the edges of the page before saving.
If your uploaded scan needs to be a specific file size, such as under 200KB for a form, use compress PDF to 200KB after combining your pages. For scans that come out rotated the wrong way, the PDF rotate tool fixes individual pages without rescanning.
Tools for this
Frequently asked questions
Do I need to download a scanner app for my phone?
No. Android's Google Drive app and iPhone's Notes app both have a built-in document scanner that detects page edges, straightens the image and saves the result as a PDF, without any extra app.
Why does my phone scan look grey or patchy?
This is almost always a lighting problem, not a scanner problem. Use even, bright light directly above the document, avoid casting a shadow over the page, and place it on a plain, contrasting surface.
How do I scan multiple pages into one PDF?
Both Google Drive's scanner and Notes' Scan Documents feature let you add more pages before saving, so you end up with one multi-page file. If you already have separate scans, combine them afterwards with an image-to-PDF tool.
How do I make my scanned PDF smaller for an upload form?
Combine your scanned pages into one PDF first, then run it through a PDF compressor that lets you target a specific size, such as under 200KB or 500KB, rather than compressing each page image separately.
Can I scan a document in black and white to make it smaller?
Yes. Most built-in phone scanners offer a black-and-white or high-contrast filter, which often looks cleaner for text documents and also produces a smaller file than a full-colour scan.
Sources
- Google Drive Help, Scan documents with Google Drive (checked 2026-09)
- Apple Support, How to scan documents on your iPhone or iPad (checked 2026-09)
Rules and limits change. Always check the latest official notification or portal before you submit a form.