How to Convert Scanned Documents to PDF
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There's an important difference between scanning a document and converting one you've already scanned. If you have a fresh stack of paper, you want a scanning workflow. But often you already have the images — a flatbed scanner dumped a folder of JPEGs, a colleague emailed photos of a signed form, or your phone's gallery is full of pictures of paperwork. The job now is to gather those into a single, tidy PDF.
This guide covers exactly that: combining scan images you already have into one PDF using the free Image to PDF tool, which runs in your browser with nothing uploaded. It also explains the part people get wrong — that a converted scan is a picture of text, not searchable text, and what to do if you need the words back.
If you still need to capture the paper in the first place, see the dedicated scanning guide; this one assumes the images already exist.
Step by step
- 1
Gather your scan images
Collect the JPG or PNG files from your scanner, email or camera roll into one place so you can add them in a single pass.
- 2
Open the Image to PDF tool
Go to the Image to PDF tool in your browser. It accepts JPG, PNG and WebP and processes everything on your device — no upload, no account.
- 3
Add the images in document order
Drag the scans onto the drop zone. Use the arrows to put pages in the right sequence — page one of the form before page two.
- 4
Create the PDF
Click Create PDF. Each scan becomes a page, and the tool combines them into one document locally.
- 5
Compress if it's large
Scans are image-heavy and the PDF can be big. Run it through Compress PDF to fit email or upload limits — scanned content shrinks a lot with little visible loss.
- 6
Add searchable text if you need it
A converted scan is an image, so the text can't be searched. To make it searchable, run text recognition (OCR) with the PDF Editor app, which adds an invisible text layer over the scan.
Tips
- Straighten and crop each scan before combining — a skewed page stays skewed once it's in the PDF.
- Consistent resolution across pages makes a tidier document. Wildly mismatched image sizes produce pages that jump around in scale.
- Browser tools can combine scans but can't read the text inside them. If you need to search or copy the words, that's an OCR job, which the PDF Editor app handles.
- Keep colour scans for anything with stamps, highlights or signatures; switch to grayscale only when colour adds nothing, since it shrinks the file.
- Name the file for its contents and date. "Lease-signed-2026-05.pdf" is far easier to retrieve later than a string of scanner numbers.
Try it on your phone
If the "scans" are really photos on your phone, the PDF Editor app is the shortcut: it turns camera-roll images into a PDF, can capture new pages with edge detection, and can run text recognition so the result is searchable — all without uploading anything.
