How to Scan a Document Into Your Computer

The basic steps: scanner, software, and where the file goes

To scan a document, you place the paper in your scanner, open the scanning software on your computer, choose your settings, and press the scan button. The scanner converts the paper into a digital image file — usually a PDF or JPG — and saves it to a folder you choose. Most home scanners connect to your computer by USB cable, though some connect wirelessly over your home network.

The whole process takes two to five minutes per page once you have the scanner set up. The speed depends on your scanner model and the quality settings you choose. A basic flatbed scanner (the kind that looks like a small photocopier) is the most common type for home use and costs between $50 and $200.

Key Takeaways

Place your document face-down on the scanner glass, close the lid, and open your scanner's software on your computer before pressing scan.
Choose PDF format for documents you want to keep readable and searchable; choose JPG if you need a smaller file size or plan to edit the image.
Set the resolution to 300 DPI for documents you might need to read or print later; lower settings like 150 DPI are fine for documents you only need to store.
Save your scanned file to a specific folder on your computer with a clear name so you can find it later — avoid leaving it on your desktop.

How to place the document and start the scan

Open the scanner lid and place your document face-down on the glass, with the top edge aligned to the corner marked on the scanner bed. Close the lid gently — do not press hard. If your document is larger than the scanner bed, you will need to scan it in two halves and combine them later, or use a document feeder if your scanner has one.

Open the scanning software on your computer. This is usually a program that came with your scanner — common names include Canon IJ Scan Utility, Epson Scan, or HP Scan. If you cannot find it, check your computer's Applications folder (Mac) or Programs folder (Windows), or search for the scanner brand name plus "scan" in your system search.

Once the software is open, you will see a preview window. Click the Preview or Scan button to see how the document will look. Adjust the position if needed, then click the final Scan button to save the file.

Choosing the right file format for what you need

PDF is the best choice for most documents. It preserves the layout, keeps text searchable (meaning you can use Ctrl+F to find words inside the file), and works on any computer. PDFs are also smaller than JPG files and are the standard format for storing important papers like contracts, medical records, or tax documents.

JPG is useful if you need a smaller file size for email or cloud storage, or if you plan to edit the image in photo software. JPG files are larger than PDFs and text inside them is not searchable, so avoid JPG for documents you need to reference later.

Your scanner software will have a dropdown menu or radio buttons to choose the format. Select PDF unless you have a specific reason to use JPG.

Understanding resolution and what DPI means

DPI stands for dots per inch and controls how sharp and detailed your scan will be. Higher DPI means a larger file and a slower scan, but a clearer image. Lower DPI means a faster scan and a smaller file, but less detail.

For documents you plan to read, print, or archive, use 300 DPI. This is the standard for documents that need to be readable and is what most government offices and banks expect if you need to send them a scanned copy. For documents you only need to store and rarely look at, 150 DPI is fine and will save disk space. Never go below 150 DPI — the image will be too blurry to read.

Your scanner software will have a dropdown menu labeled "Resolution" or "Quality". Select 300 DPI from the list. If you do not see DPI numbers, look for words like "Best", "High", or "Standard" — "High" or "Best" is usually 300 DPI.

Choosing where to save your file and naming it clearly

Before you scan, decide where the file will go. Your scanner software will ask you to choose a location — this is called the "save location" or "destination folder". Create a folder for scanned documents if you do not have one already. On Windows, you can create a folder called "Scanned Documents" in your Documents folder. On Mac, create one in your Documents folder the same way.

Give your file a clear name that tells you what it is. Instead of "scan001" or "document", use names like "Lease_2024_January" or "Car_Insurance_Policy_State_Farm". Include the date if the document is time-sensitive. Avoid special characters like / or : in the filename — they can cause problems. Use underscores or hyphens instead of spaces.

Your scanner software will have a text field where you type the filename. Type your name, then click Save or Scan. The file will be saved to the folder you chose.

What to do if the scan comes out blurry or crooked

If your scan is blurry, the resolution was too low or the document moved during the scan. Place the document again, make sure the lid is closed, and increase the DPI to 300. If the document is still blurry, your scanner glass may be dirty — wipe it gently with a soft, dry cloth.

If the scan is crooked, the document was not aligned properly on the glass. Place it again, making sure the top edge is straight and flush with the corner marking. Use the preview function in your scanner software to check the alignment before you scan.

If the scan is too dark or too light, your scanner software has a brightness or contrast slider. Open the preview, adjust the slider, and scan again. Most scanners have an "Auto" setting that adjusts brightness automatically — try that first.

Scanning multiple pages into one file

If you have a multi-page document, you can scan all pages into a single PDF file. Place the first page on the scanner, open your software, and look for a button or checkbox labeled "Scan Multiple Pages" or "Batch Scan". Scan the first page, then the software will prompt you to place the next page. Repeat until all pages are scanned. The software will combine them into one PDF file automatically.

If your scanner does not have this feature, scan each page separately and name them clearly — "Lease_Page1", "Lease_Page2", and so on. You can combine them into one PDF later using free software like ILovePDF (ilovedf.com) or PDFtk (pdftk.com). Upload your separate scans, arrange them in order, and read the combined file.

Frequently Asked Questions

Can I scan directly to my phone or tablet instead of my computer?

Yes, if your scanner has wireless capability and a mobile app. Check your scanner's manual or the manufacturer's website to see if an app is available for your phone. You will need to connect the scanner to your home WiFi network first. If your scanner does not have an app, you can use your phone's built-in camera to photograph the document, though the quality will not be as good as a scanner.

What if my scanner is not showing up in the software?

Check that the USB cable is plugged into both the scanner and your computer, and that the scanner is turned on. On Windows, go to Settings > Devices > Printers & Scanners and look for your scanner in the list. On Mac, go to System Preferences > Printers & Scanners. If it is not there, restart both the scanner and your computer. If it still does not appear, you may need to install the driver software from the manufacturer's website.

How much disk space do scanned documents take up?

A single page scanned at 300 DPI as a PDF is usually between 500 KB and 2 MB, depending on how much text and shading is on the page. A 100-page document would take up roughly 50 MB to 200 MB. Most computers have plenty of space for thousands of scanned documents. If you are concerned about space, you can store older scans on an external hard drive or cloud storage like Google Drive or Dropbox.

Is a PDF scan the same as a photo of a document?

No. A scanner creates a high-quality digital image optimized for documents, while a phone camera creates a photo that may be blurry, crooked, or have shadows. A scanned PDF is also searchable — you can find text inside it — while a photo is not. For important documents, always use a scanner if you have one available.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.