How to Turn a PDF into One Long Image for Social Media

You made a nice-looking PDF, a portfolio, a menu, a lookbook, a set of slides, and now you want to post it somewhere that doesn’t understand PDFs at all. Instagram won’t render one. A story can only hold an image. So you need every page of that document turned into a single, tall image people can scroll through without leaving the app.

That’s a different job than “export each page as a picture.” If you just convert a PDF to images, you get a folder full of separate files, one per page. For social media you usually want the opposite: all the pages stitched together into one continuous vertical image, like a long scroll, so it reads as one post instead of a scattered gallery.

Why this comes up more than you’d think

It’s not just designers. Real estate agents turn floor plan PDFs into one scrollable image for listings. Teachers turn worksheet PDFs into a single strip for a class group chat. Small shops turn a PDF catalog into one long image for a WhatsApp broadcast. Anyone posting a multi-page PDF to a platform built for photos runs into the same wall, and the fix is always the same: flatten it into one continuous picture.

Stories and carousels also have their own quirks. A single tall image scrolls naturally inside a Story the way a normal photo doesn’t. A carousel, on the other hand, wants separate square-ish images per slide. Knowing which one you’re building changes how you’ll use the result, but the first step is identical either way: get clean, high-resolution images out of the PDF.

How to do it, step by step

1. Convert the PDF to images first. Use a PDF to Images tool to turn every page into its own PNG or JPG. Pick PNG if the pages have text or sharp lines, it stays crisp. Pick JPG if the pages are mostly photos, the file size stays smaller.
2. Check the resolution before you export. Social platforms compress uploads hard, so start higher than you think you need. If your tool lets you set DPI, aim for at least 150, higher for anything with fine print.
3. Stitch the pages into one image. Once you have individual page images, combine them vertically into a single tall file. This is the part people usually miss: it’s not the same step as exporting the pages, it’s a second pass that stacks them top to bottom into one long image sized for scrolling.
4. Trim the edges. PDFs often carry a bit of white margin on every page. Crop it off the stitched image so you don’t end up with a stripe of dead space between each “page” in the final result.
5. Export at the right proportions. For a Story, aim for a tall, narrow image, something in the 1080-wide range with as much height as the content needs. For a carousel, you’ll usually want to keep the pages closer to their original shape instead of stacking them.
6. If you need other formats along the way, an image format converter handles swapping between PNG, JPG, and other formats without a second trip through the PDF.

A few things that trip people up

Text that looked fine in a printed PDF can go blurry once it’s squeezed into an Instagram feed, because the platform recompresses your upload. Going in slightly larger and sharper than you think you need gives that recompression something to work with. Fonts under about 10pt in the original PDF rarely survive the trip at all, so if a page is dense with small print, consider whether it needs to be there.

Color can shift too. PDFs built for print sometimes use a color profile that looks different once it’s rendered as a plain image on a phone screen. If colors matter, a quick look at the exported image before you post beats finding out after 200 people have seen it.

It never leaves your device

Every step here, converting the PDF, resizing, stitching the pages together, cropping the margins, happens locally in your browser. Nothing gets uploaded to a server to do this work. That matters for anything you wouldn’t want sitting on someone else’s storage even briefly, a client’s unreleased portfolio, a menu before launch day, or just a document you’d rather keep control of. You open the file, do the conversion, and close the tab, and that’s the whole trip.

Once you’ve got your long image or your carousel set, the actual posting is the easy part. The PDF-to-social-image conversion is the step that usually eats the most time, and doing it right the first time saves you from re-exporting three times because the text came out fuzzy or the pages landed out of order.