Batch Convert Images to PDF: The Fast Way in 2026

Last week I had to convert 47 receipt photos into a single PDF for an expense report. One by one? That would have taken forever. Luckily there are faster ways.

Whether you're dealing with scanned documents, photos, screenshots, or anything else, batch converting images to PDF saves a ridiculous amount of time. Let me show you the methods I actually use.

Why Convert Images to PDF?

A few common reasons:

Document submission: Most organizations want PDF, not loose images
Archiving: One PDF beats 50 separate image files for organization
Sharing: Sending one file is easier than sending a zip of images
Professional appearance: PDFs look polished, image dumps look sloppy
Size reduction: A well-compressed PDF can be smaller than the sum of the original images

Method 1: Windows Built-In (Print to PDF)

Windows can do this natively, and most people don't know:

Select all your images in File Explorer (Ctrl+A or Ctrl+click)
Right-click and select "Print"
Choose "Microsoft Print to PDF" as the printer
Under "Options," pick your layout (full page, 2 per page, etc.)
Click Print
Choose where to save

That's it. No software needed. The images print in the order they appear in the folder, so rename them with numbers (01, 02, 03...) if you want a specific order.

The downside? Limited control over layout and quality. But for a quick job, it works perfectly.

Method 2: Mac Preview (Free)

Mac users have it even easier:

Select all images in Finder
Right-click > Open With > Preview
In Preview, select all thumbnails in the sidebar (Cmd+A)
Go to File > Export as PDF
Save

Preview also lets you rearrange pages by dragging thumbnails. Very handy when you need a specific order but didn't name your files logically.

Method 3: Online Converters

For quick jobs when you don't want to think about it:

iLovePDF: Upload images, drag to reorder, download PDF. Free for up to 15 images.
SmallPDF: Similar workflow, clean interface.
PDF24: No file limit on the free tier, which is unusual.

The privacy concern applies here — you're uploading images to someone else's server. For personal photos or sensitive receipts, consider an offline method instead.

Method 4: Command Line Tools (Batch Processing King)

For serious batch work, nothing beats the command line. These tools handle hundreds or thousands of images without breaking a sweat.

ImageMagick

Free, open-source, works on all platforms:

convert *.jpg output.pdf

That one command converts every JPG in the folder into a single PDF. Want to resize them first?

convert *.jpg -resize 1200x1600 output.pdf

Want to add compression?

convert *.jpg -quality 85 -compress JPEG output.pdf

ImageMagick is my go-to for large batch jobs. It handles PNG, JPG, TIFF, BMP, and basically every image format you can think of.

img2pdf (Python)

If you have Python installed, img2pdf is fantastic:

img2pdf *.jpg -o output.pdf

The advantage over ImageMagick: img2pdf doesn't re-encode the images. It wraps the original image data directly into the PDF. No quality loss at all. For photos, this matters a lot.

Method 5: LibreOffice (Free Desktop App)

LibreOffice Impress (the presentation tool) can convert images to PDF:

Create a new presentation
Insert each image as a slide
Export as PDF (File > Export as PDF)

This gives you more layout control than the other methods — you can add text, adjust positioning, set page sizes. It's overkill for simple conversions, but perfect when you need a polished result.

Getting the Best Quality

A few tips from many, many batch conversions:

Image resolution matters: 300 DPI for print quality, 150 DPI for screen viewing. Higher than 300 just makes bigger files with no visible improvement.
JPEG quality 85% is the sweet spot for photos — barely noticeable difference from 100% but much smaller files.
PNG for screenshots and text: PNG preserves sharp edges better than JPEG. If your images have text, use PNG.
Consistent sizing: Mix of portrait and landscape images makes for an awkward PDF. Rotate or crop to be consistent if possible.
File naming: Name files 001.jpg, 002.jpg, etc. for predictable ordering. Most tools sort alphabetically.

Organizing Before Converting

I learned this the hard way after creating a 200-page PDF with pages in random order:

Rename files with leading numbers (01_, 02_, 03_...)
Delete duplicates and bad photos first
Rotate any sideways images before converting
Group related images into folders if making multiple PDFs

Five minutes of organization saves an hour of rearranging pages later.

File Size Considerations

50 high-resolution photos can easily create a 500MB PDF. That's unwieldy for email or sharing. Here's how to keep sizes reasonable:

Resize images before converting (1200px wide is plenty for most uses)
Use JPEG compression (quality 75-85%)
After creating the PDF, run it through a PDF compressor
For email, aim for under 10MB. Most email servers reject larger attachments.

The Bottom Line

For a handful of images, use your OS built-in tools (Windows Print to PDF or Mac Preview). For large batches, use ImageMagick or img2pdf. For online convenience with small files, the web tools work fine.

The key is matching the tool to the job. Don't overthink it for five receipts. Don't under-tool it for 500 scanned pages. And always, always name your files in order before converting.