How to turn a PDF into one long image for a social post: three steps
PDF previews in chat apps are awkward, and a tall image is much nicer to scroll. Here are the width, quality and sharing notes that matter.
After an event last week, the organisers only sent a PDF press release and the marketing colleague was stuck: "We cannot post a PDF — am I going to screenshot it page by page?" I showed her PDF to Long Image: three minutes later she had one tall image you can scroll to the bottom, and it got more engagement than a nine-tile screenshot grid.
Why a long image is worth it
- In a chat app a PDF has to be downloaded before it can be read, so the open rate is low.
- Social posts and article illustrations are fundamentally image streams, and a tall image matches how people scroll.
- One long image looks more "finished" than nine loose screenshots, and it carries the brand better.
Three steps
Step 1: upload the PDF
Open PDF to Long Image in your phone or desktop browser and drop the PDF in. Multiple pages are stitched vertically automatically.
Step 2: choose the output width
I recommend 1080px — it matches the width of most phones and keeps the file size sane. You can try 1242 for some platforms, and 750 is fine for a quick look.
Step 3: download and post
Save the PNG or JPG and publish it from your chat app. If it is too long (apps limit image size), shrink the source with Compress PDF or split it into two long images.
[Image: the press release PDF before and after, PDF page numbers on the left, one continuous image on the right]
Where it works best
| Platform | Advice |
|---|---|
| Social timeline | Width 1080, keep the whole image under 10MB |
| Article illustrations | Put the long image at the top, or split it into sections |
| Microblogging | Watch the height — very tall images get compressed |
Quality notes
A long image is a bitmap, and the width is what keeps the text sharp, not a DPI number you pick. 1080px wide with normal type size is enough for reading on a phone. If the source PDF is a blurry scan, converting it to a long image will not rescue it — you need a better source file.
If you need separate JPGs per page rather than one long image, PDF to Images is the better tool.
How it beats manual screenshots
Manual screenshots have seams, repeat the header and footer, and end up at inconsistent resolutions. The tool renders whole pages and aligns the edges, which saves half an hour of fiddling.
Common questions
The long image is too big to send? Split the PDF into two halves and convert them separately, or drop the width to 750.
The background turned black? Check whether the PDF uses a dark theme; exporting to PNG keeps transparency more reliably in some cases.
The end
Turning a PDF into a long image is one of the highest-return features for anything you share. Next time a PDF press release lands in your inbox, do not reach for the screenshot tool first — try the one-click long image.
Convert now → open PDF to Long Image and turn any multi-page PDF you have into your first tall image.