How to Convert Text PDFs to Image-Only Scanned PDFs on Mac
Question details
The user needs to batch-convert text-based PDFs, such as downloaded scientific articles, into image-only scanned PDFs in monochrome on macOS without manually processing each file.
- Product
- PDF Editors
- Device & OS
- macOS
- Scenario
- Batch-converting downloaded scientific articles into image-only, monochrome PDF formats securely and efficiently.
- Observed behavior
- Native applications like Adobe Acrobat do not offer a direct one-click batch command to convert text pages into scanned-style image PDFs, requiring complex workarounds.
Ensure you have backed up your source PDFs in a separate folder before proceeding. Converting text-based PDFs to image-only formats will permanently remove all selectable and searchable text layers.
Export Pages as Images and Recombine
Exporting the PDF pages as high-resolution images and combining them into a new PDF effectively strips out the text layers, leaving an image-only document.
This method forces the PDF software to rasterize every page. While it removes selectable text, it ensures that your document looks exactly like a scanned file.
Open your original PDF in Adobe Acrobat. Go to 'File' > 'Export To' > 'Image' and select either 'TIFF' or 'PNG'.
Click the 'Settings' gear icon in the export dialog. Change the Color Space or Output to Grayscale/Monochrome to match the scanned look, then click 'Save'.
Once the pages are exported as images, select all the image files in macOS Finder, right-click, and choose 'Quick Actions' > 'Create PDF', or combine them back using Acrobat's 'Combine Files' tool.
Use Print to PDF as Image
Use the Print dialog's advanced settings to print the document as an image, directly saving the output as a flattened PDF file.
Automate with macOS Automator
Build a custom workflow in macOS Automator to batch-convert multiple PDFs into images and back to PDFs without manual intervention.
Flatten and Convert PDFs to Images Effortlessly with WPS Office
WPS Office provides a comprehensive PDF toolkit that allows you to quickly export text-based PDFs to high-quality images and merge them back into flattened, image-only PDFs with ease.
- 1. Open PDF in WPS Office: Launch WPS Office and open your text-based PDF document.
- 2. Export to Picture: Navigate to the 'Tools' tab on the top ribbon and select 'PDF to Picture'.
- 3. Customize Output: Choose your desired image format, select a black-and-white or grayscale color profile, and click 'Export'.
- 4. Rebuild Image PDF: Use the 'Picture to PDF' tool in the WPS Office toolkit to select your newly exported images and merge them into a completely flattened, image-only PDF.
Frequently Asked Questions
Why convert a text PDF into an image-only scanned PDF?
Converting to an image-only PDF prevents users from easily copying, editing, or scraping the text data. It also guarantees that the document layout and typography remain perfectly identical on any device without relying on system fonts.
Can I still search for text in an image-only PDF?
No, an image-only PDF does not contain selectable text layers, so traditional search commands (Cmd+F) will not work. To make the text searchable again, you would need to run an Optical Character Recognition (OCR) scan on the document.
Does macOS Preview support batch converting PDFs to images?
While macOS Preview allows you to export individual PDF pages as images (like JPEG or PNG), it does not natively support automated batch processing for multiple files simultaneously. You will need to use Automator, third-party PDF utilities, or command-line scripts to batch process entire folders.
