Receipts. Contracts. Scanned forms. Portfolios. There are a hundred reasons a stack of images needs to become one PDF.
The good news: this is one of the simplest conversions there is. The bad news: half the tools that do it want your email first.
Why PDF instead of a zip of images
A PDF keeps pages in order. It opens on every device without special software. It prints exactly as it looks on screen. And you can send one file instead of seventeen.
For anything official, a single PDF reads as finished. A folder of JPGs reads as a draft.
Getting the page order right
This is where most people mess up. Name your files in order before converting: 01-front.jpg, 02-back.jpg, 03-receipt.jpg. Whatever order the files go in, that's the page order.
Check the order twice. A contract with the signature page in the middle looks wrong and confuses everyone who reads it. Thirty seconds of checking saves an embarrassing resend.
Image quality inside the PDF
Your images should be readable at the size they'll be viewed. For documents meant to be read on screen or printed at normal size, 150 DPI is plenty. For anything with fine print, keep the originals at full resolution.
Don't shrink your images before converting if the PDF might get printed. Screen viewing forgives a lot. Paper doesn't.
One image per page, or many
One image per page for documents: contracts, forms, scanned pages. Each image becomes its own page, in order.
Multiple images per page works for photo collections or portfolios where you're showing, not documenting. Most converter tools let you pick the layout.
Practical tip: if your PDF needs to be emailed, watch the total size. Ten full-resolution phone photos become a 40 MB PDF that bounces off attachment limits. Compress the images first, then convert. A readable 3 MB PDF beats an undeliverable 40 MB one.
The free way
Jiggle X Wiggle's free converter turns your images into a PDF in seconds. Upload in order, download one file. No account, no watermark stamped across your pages.
Images in, PDF out. That's the whole job.