The fastest way depends on what you have

If you own a scanner, use it — the image quality is better and the process takes less time. If you don't own one, your phone's camera works well enough for most purposes, though the file will be larger and you'll need to crop and straighten it yourself. A third option is to use a multifunction printer that has a scanner built in; many offices and libraries also let you scan for free or a small fee.

The steps differ depending on which tool you choose, but the goal is the same: turn a paper document into a digital file you can store, email, or upload. This guide covers all three methods so you can pick the one that fits what you have available right now.

Key Takeaways

  • A dedicated scanner produces the clearest images and saves files automatically to your computer in one step.
  • Your phone's camera can scan documents if you use a scanning app, which straightens the image and converts it to PDF automatically.
  • Multifunction printers with built-in scanners work the same way as standalone scanners and are often free to use at libraries or offices.
  • The most common file formats are PDF (best for sharing and printing) and JPG (best if you need to edit the image later).
  • Lighting matters more than the device — a well-lit document scanned with a phone camera will look better than a poorly lit document scanned with an expensive scanner.

Scanning with a dedicated scanner

Place your document face-down on the glass bed of the scanner, align it with the corner guides, and close the lid. Open the scanning software on your computer — this is usually called something like "Canon Scan" or "HP Scan" depending on your scanner's brand. The software will appear on your desktop or in your Start menu.

In the scanning software, you'll see options for resolution (measured in DPI, or dots per inch), file format, and where to save the file. For most documents, 300 DPI is the standard and produces a clear, readable image without making the file too large. Choose PDF if you want a single file that's straightforward to share, or JPG if you might need to edit the image in a photo editor later. Click the "Scan" button, and the scanner will pull the document through or scan the glass bed. The file will save automatically to the folder you selected.

If your scanner has an automatic document feeder (ADF) — a tray at the top where you stack multiple pages — you can scan many pages at once. Load the stack face-up in the feeder, set the page count in the software, and start the scan. The scanner will feed each page through automatically.

Scanning with your phone camera

Your phone's camera alone won't produce a properly formatted scan — the image will be tilted, have shadows from your hand, and won't be compressed into a standard file format. Instead, use a scanning app. Free options include Google Drive (built into Android phones), Microsoft Lens (free on iPhone and Android), or Adobe Scan (free on both). These apps use your phone's camera but add automatic straightening, shadow removal, and conversion to PDF.

Open the scanning app, point your phone's camera at the document, and tap the button to capture. The app will automatically detect the document's edges, straighten it, and remove shadows. Review the image — if it looks crooked or cut off, retake it. Once you're satisfied, the app will convert it to PDF and save it to your phone's storage or to a cloud service like Google Drive or OneDrive. From there, you can read it to your computer, email it, or share it directly.

Phone scanning works best in good lighting. Position the document on a flat surface and hold your phone directly above it, parallel to the page. Avoid scanning near a window where sunlight creates glare. If you're scanning multiple pages, take each one separately — the app will combine them into a single PDF if you ask it to.

Scanning at a library or office

Most public libraries have multifunction printers with built-in scanners available for public use, usually for free or for 25 cents per page. Ask the librarian where the scanner is located and whether you need to reserve time. The process is the same as using a scanner at home: place the document on the glass, open the software on the library's computer, and select your settings.

The main difference is that you'll save the file to a USB drive or email it to yourself rather than saving it directly to your home computer. Bring a USB drive with you, or ask the library staff if you can email the file to your own email address. Some libraries also let you save to a cloud service like Google Drive if you log in on the library's computer.

If you work in an office, your workplace likely has a multifunction printer that employees can use. The process is identical, but ask your manager or IT department first about where to save files and whether there are any restrictions on what you can scan.

Choosing the right file format

PDF is the best choice for most documents. It preserves the layout exactly as it appears on paper, works on any device, and is straightforward to share via email or upload to websites. PDFs are also searchable — if you scan a text document, you can use the Find function to search for words. Most scanning software creates PDFs by default.

JPG is useful if you plan to edit the image in a photo editor or if you need a smaller file size for email. JPG files are smaller than PDFs but lose some quality each time you save them, so avoid JPG if you need to keep the document long-term. JPG is also not searchable the way PDF is.

TIFF is a professional format used in archiving and publishing. You won't need it unless your workplace specifically asks for it. TIFF files are very large and don't compress well for email or web upload.

Fixing common scanning problems

If your scanned image is too dark, the document was either poorly lit or the scanner's brightness setting was too low. Retake the scan and increase the brightness in the software before scanning again. If the image is too light or washed out, decrease the brightness. Most scanning software has a preview window that shows you what the scan will look like before you commit to it — use this to check your settings.

If the document is crooked or cut off, you didn't align it properly on the scanner bed or hold your phone parallel to the page. Straighten the document, align it with the corner guides, and try again. Phone scanning apps will usually auto-correct minor tilting, but if the document is severely crooked, the app may cut off the edges.

If the file is too large to email, you can compress it. In most scanning software, lowering the resolution from 300 DPI to 200 DPI will cut the file size roughly in half with minimal loss of readability. You can also convert the PDF to JPG, which compresses it further, though you lose the searchability of PDF.

Organizing and storing your scanned documents

Create a folder on your computer called "Scanned Documents" and organize it by category — for example, "Medical," "Financial," "Legal," or by year. Name each file clearly: instead of "Scan001.pdf," use "2024 Tax Return.pdf" or "Lease Agreement - Apartment 5B.pdf." This makes it much easier to find documents later.

Consider backing up important scans to a cloud service like Google Drive, OneDrive, or Dropbox. This protects you if your computer fails or gets damaged. Most of these services offer free storage for a limited amount of data — typically 15 GB for Google Drive and OneDrive, and 2 GB for Dropbox. If you scan sensitive documents like financial records or medical information, use a service that offers encryption, and consider password-protecting the PDF itself.

Frequently Asked Questions

What DPI should I use when scanning?

300 DPI is the standard for most documents and produces a clear, readable image. For documents you only need to read on screen, 200 DPI is fine and saves file space. Use 600 DPI only if you're scanning photos or artwork that you plan to print or edit — higher DPI makes files much larger without improving readability for text.

Can I scan both sides of a document at once?

No, you have to scan each side separately. Place the first side on the scanner, scan it, then flip the document and scan the other side. If your scanner has an automatic document feeder, you can load all the front sides first, scan them, then reload the stack flipped to scan the back sides. Some newer scanners have duplex scanning, which scans both sides automatically — check your scanner's manual to see if yours has this feature.

What's the difference between scanning and photographing a document?

A photograph is just an image file with shadows, perspective distortion, and whatever's in the background. A scan is processed to remove shadows, straighten the document, and optimize contrast so the text is readable. Scanning apps on your phone do this processing automatically, which is why they produce better results than just taking a photo.

Can I scan a document that's already in a book or magazine?

Yes, but be careful not to damage the binding. Open the book or magazine as flat as possible and place it face-down on the scanner glass. If the spine is too thick to lie flat, you may need to photocopy the page first, then scan the photocopy. Phone scanning apps work better for this because you can hold the phone at an angle to avoid shadows from the spine.

How do I make a scanned document searchable?

Most scanning software has an option called OCR (optical character recognition) that converts the image of text into actual text you can search. Enable OCR in your scanning software before you scan, and the resulting PDF will be searchable. If you already have a scanned PDF without OCR, you can use free online tools or Adobe Acrobat to add OCR after the fact.