Convert JPG to PDF on Mac

Insurance forms, signed scans, photo proofs, and expense receipts. One PDF is easier to attach than twelve separate JPEG files. Reviewers scroll one document, portals accept a single upload, and print shops expect a multi-page PDF rather than a folder of images. The merge step is quick on a Mac; the size check afterward is what keeps email and portals happy. Build the PDF once, verify page order at full zoom, then compress only if the attachment still fails a limit test.

When one PDF beats many JPEGs

Scenario	Why merge into PDF
Email submission	One attachment under the size limit
Client portal	Single file field, not a zip of photos
Print order	Page order is fixed in the document
Legal or HR packet	Signatures stay on the correct page

Each JPEG still carries full image data. Merging does not shrink files by itself. A dozen phone photos can produce a 25 MB PDF that email rejects. Plan to compress after merge when scans were shot at full camera resolution.

Government and insurance portals sometimes cap page count as well as megabytes. A merged PDF with one image per page is easier to validate than a zip of photos with ambiguous ordering.

If you need the reverse workflow, see PDF to images on Mac for exporting pages back to PNG or JPEG.

Combine images in Preview

Preview is the built-in way to convert JPG to PDF on Mac without extra software:

1. Open the first JPEG in Preview.
2. Choose View → Thumbnails so the sidebar shows pages.
3. Drag other JPEG files into the sidebar. Each image becomes one page.
4. Choose File → Export as PDF… and save the merged document.

Preview preserves page order as shown in the thumbnail list. Drag to reorder before export. For mixed orientations (portrait receipts plus landscape IDs), rotate individual pages with Tools → Rotate before you merge more files.

Batch tip: select multiple JPEG files in Finder, open them together in Preview, and they load as pages in one window. Faster than opening files one at a time for large scan sets.

If a page looks rotated after merge, fix it in the thumbnail sidebar before export. Fixing rotation after PDF export is slower and sometimes re-encodes the page.

Order and page size

Page order matters for forms and signed packets. Drag thumbnails until the sequence matches what the recipient expects.

Goal	Preview step
Uniform page width	Tools → Adjust Size on each image before merge
Consistent margins	Resize images to the same pixel width first
Correct orientation	Tools → Rotate Left/Right per thumbnail
Blank separator page	Edit → Insert → Blank Page between sections

If pages should match a letter or A4 layout, resize images in Preview before export rather than relying on print scaling later. Oversized camera JPEG files produce oversized PDF pages even when the content is a small receipt in the center.

When source images are already compressed JPEG scans, avoid re-saving through multiple lossy steps. Merge once, then compress the PDF as a single step if needed.

For ID scans and receipts, a consistent width (for example 1500 px) keeps every page a similar file size inside the PDF.

Shrink the PDF after

Merged scans often exceed email and portal limits. After export:

1. Open the new PDF in Preview.
2. Choose File → Export…
3. Set Quartz Filter → Reduce File Size
4. Save as a new file and compare text and signature lines at 100% zoom.

If quality drops too much, resize the original JPEG files to 1500 to 2000 px wide before merge instead of crushing an already large PDF.

See how to compress PDF on Mac for portal limit tables and Keynote re-export when the PDF came from slides rather than scans.

If quality drops too much, resize the original JPEG files to 1500 to 2000 px wide before merge instead of crushing an already large PDF.

Some portals reject PDF files with certain embedded color profiles. If upload fails with no size error, re-export once from Preview with Reduce File Size and retry before you change merge settings.

Double-check page order in the thumbnail sidebar after a long drag-and-drop session. An upside-down signature page is harder to fix after you already emailed the PDF.

Using GetCompress

GetCompress does not merge images into a PDF. Use Preview for the merge step first. After you convert JPG to PDF on Mac, GetCompress helps when the merged file is still too large to send.

• Drop the merged PDF into GetCompress and pick a PDF compression preset.
• Preview pages when signatures, stamps, or fine print must stay readable.
• Batch several merged PDF files when a folder of scan batches shares the same preset.
• Save the preset for recurring expense or insurance submissions.
• Process locally with no upload, which matters for personal and HR documents.

For image-only cleanup before merge, resize JPEG sources with how to compress images on Mac so the PDF starts smaller. GetCompress fits the step after merge when you need one optimized file ready for email.

Label merged files with the date and recipient in the filename so you do not resend an older uncompressed version by mistake from Finder search results.

Keep a text note in the same folder listing which pages were reordered so the next person who opens the PDF does not assume the scan order matches the original stack.