A document that scrolls, not a document you open
Sending a PDF into a chat app produces a file attachment: a tap, a loading screen, a separate viewer. Sending an image produces something that just appears in the conversation and scrolls like anything else. For a two-page flyer, a receipt, a set of instructions or a short form, that difference is the whole reason to convert. This stitches every page of a PDF into one tall image sized for exactly that — scrolling, not paging through.
How it differs from PDF to PNG or PDF to JPG
| PDF to PNG / PDF to JPG | PDF to Long Image | |
|---|---|---|
| Output | One image file per page | One image file total |
| Reading it | Open each file separately, in order | Scroll continuously, like a long screenshot |
| Right for | Printing individual pages, further editing per page | Sharing the whole document as one message or post |
| Page boundaries | Implicit — one file per page | Marked with an optional thin divider line |
If you need to edit or print a specific page on its own, the per-page tools are the right choice. If the document is short and the goal is that someone can scroll through it without downloading or opening anything, this is what social platforms and chat apps are actually built to display well.
Why there is a page limit
Browsers refuse to create a canvas taller than roughly 32,000 pixels — a limit built into the rendering engine, not this tool. A sixty-page document rendered at a readable width would exceed that easily, so the page count is capped and, for documents near the limit, the render scale is reduced automatically to keep the whole thing inside what the browser will allow. For anything longer than the cap, split it first with Split PDF and stitch each part separately.
Choosing JPG or PNG
- JPG is right for most documents — photographs, mixed content, anything where a small amount of compression is invisible. The result is a fraction of the size, which matters more here than usual because the whole point is sharing quickly.
- PNG suits pages that are mostly sharp text or line art, where JPEG's compression can put faint ringing around letters at close inspection. Expect a noticeably larger file.
What it is not for
- Long documents. A sixty-page report stitched into one image is not more readable than the PDF — it is a very long scroll with no way to jump to a section. Use it for things short enough that scrolling through the whole thing is reasonable: a handful of pages, not a report.
- Anything that needs to stay searchable. The result is a picture. Text in it cannot be selected, copied or found with a search.
- Printing. A single very tall image does not map onto physical paper sizes. Use PDF to PNG or PDF to JPG for that, one file per page.