You can scan documents directly from your phone using a built-in camera app or a dedicated scanning app

Your phone's camera can work as a scanner if you use the right app and hold the document steady. Most phones come with a built-in scanning feature — Apple devices have Notes, Android devices often have Google Drive or Google Lens, and both platforms have free third-party options like Adobe Scan or Microsoft Lens. The scanned file saves as a PDF or image file that you can email, upload, or move to your computer later.

The main advantage over a physical scanner is that you always have your phone with you. You can scan a receipt, a contract, or a page from a book without leaving your desk or waiting for a scanner to warm up. The trade-off is that phone scans depend on lighting, your ability to hold the phone steady, and the app's ability to detect the document edges — a flatbed scanner will usually produce a cleaner result, but a phone scan is faster and works anywhere.

Key Takeaways

  • iPhones have a built-in scanner in the Notes app that requires no read; Android users can use Google Drive, Google Lens, or read Adobe Scan or Microsoft Lens for free.
  • Hold the phone 6 to 12 inches above the document, keep the document flat and well-lit, and tap the shutter button when the app detects all four corners.
  • Most scanning apps automatically crop, straighten, and enhance the image, and let you scan multiple pages into a single PDF before saving.
  • After scanning, you can email the PDF, upload it to cloud storage, or transfer it to your computer using email, cloud sync, or a USB cable.

How to scan with an iPhone

Open the Notes app and create a new note or open an existing one. Tap the camera icon at the bottom of the screen, then tap "Scan Documents." Position your phone 6 to 12 inches above the document so that all four corners appear on screen. The app will automatically detect the document edges and highlight them in yellow. When the edges are detected correctly, the app takes a photo automatically — you do not need to press a button.

After the scan, the app shows you a preview. You can tap "Retake" to scan again, or tap "Keep Scan" to save it. If you need to scan multiple pages, tap the plus icon to add another page to the same document. When you are done, tap "Save" and the entire set of pages becomes a single PDF attached to your note. To send or read the PDF, press and hold on the attachment, then choose "Save to Files" or "Share."

How to scan with an Android phone

Android does not have a universal built-in scanner, but Google Drive includes one. Open Google Drive, tap the plus icon, and select "Scan." Position your phone above the document the same way you would with an iPhone — 6 to 12 inches away, with all four corners visible. The app detects the edges and takes a photo automatically. Tap the checkmark to keep the scan, or tap the camera icon to retake it.

To add more pages, tap the plus icon. When you are finished, tap the checkmark again. Google Drive will ask you to name the file and choose a folder. The scanned pages become a single PDF stored in your Google Drive account. You can read it to your phone, email it, or access it from any device where you are signed into Google Drive.

If you prefer a dedicated app, Adobe Scan and Microsoft Lens both work on Android and offer similar features. Adobe Scan saves files to your Adobe account by default, while Microsoft Lens can save to OneDrive, OneNote, or your phone's storage.

Getting the best scan quality

Lighting is the most important factor. Scan in natural light or under a bright lamp, and position the light so it does not create a glare on the document. If you see a reflection on the screen, move the light source or angle your phone slightly. Avoid scanning in dim light — the app will struggle to detect edges, and the final image will be blurry or dark.

Keep the document flat and still. If you are scanning a page in a book or a document taped to a wall, hold it as flat as possible. If the document is curled or wrinkled, smooth it out first. Hold your phone as steady as you can — resting your elbows on a table helps. Most apps will wait a moment before taking the photo, so you have time to stabilize your position.

If the app fails to detect all four corners, move your phone closer or farther away until the corners are visible on screen. Some apps let you manually adjust the corners by dragging them — if the automatic detection misses a corner, use this feature to correct it before saving.

Transferring scans to your computer

The easiest method is email. Open the scanned PDF in your phone's Files app or in the scanning app itself, tap Share, and select Mail. Type your own email address and send the file to yourself. Open your email on your computer and read the attachment.

If you use cloud storage, the scan may already be there. Google Drive scans save automatically to your Google Drive account — sign into Google Drive on your computer and read the file. Adobe Scan saves to your Adobe account, and Microsoft Lens saves to OneDrive if you chose that option. On your computer, sign into the same account and read the file to your hard drive.

For a USB cable transfer, connect your phone to your computer with a USB cable. On Windows, open File Explorer and look for your phone under "This PC." On Mac, open Finder and look for your phone in the sidebar. Navigate to the folder where your scans are stored and drag them to a folder on your computer.

When to use a phone scan instead of a physical scanner

Phone scans are fastest when you need to scan one or two pages quickly — a receipt, a contract you need to sign and return, or a page from a book. They work well for documents you need to send when ready, because you can scan and email in under a minute. They are also the only option if you do not have a scanner nearby.

Phone scans are less ideal for large batches of documents or for images that need to be very sharp. If you are scanning 50 pages of a book or a stack of old photographs, a flatbed scanner will be faster and produce better results. If the document has small text or fine details, a scanner will capture them more clearly than a phone camera can.

Frequently Asked Questions

Can I scan a document that is not flat?

Yes, but the quality will suffer. If the document is in a book or curled, the app may not detect all the edges correctly, and parts of the image may be blurry or distorted. For best results, flatten the document as much as possible before scanning. If you cannot flatten it, you may need to use a physical scanner instead.

What file format does the scan save as?

Most scanning apps save as PDF by default, which is the standard format for documents. Some apps also let you save as JPEG or PNG image files. PDF is better for documents with text because it preserves the layout and is easier to search. Check your app's settings to see what formats are available.

Can I edit a scanned document on my phone?

You can crop, rotate, or adjust brightness in most scanning apps before you save. After you save, you can use a PDF editor app to add notes, highlight text, or fill in forms. For major edits like retyping text, you will need to transfer the scan to your computer and use desktop software.

How much storage space do scans take up?

A single page scan is usually 500 KB to 2 MB depending on resolution and image quality. A 10-page document is typically 5 to 20 MB. If you save to cloud storage instead of your phone, storage is not a concern — Google Drive and OneDrive both offer free accounts with plenty of space for document scans.

What if the app cannot detect the document edges?

Move your phone closer or farther away until all four corners are visible on screen. Make sure the lighting is bright and even — dim light makes edge detection harder. If the app still fails, look for a manual mode or corner adjustment feature that lets you drag the corners into place yourself before saving.