You want a thumbnail of the report cover for a blog post, a knowledge base, an internal wiki. The whole PDF is 50 pages. You need the first page as an image.
Two paths to the cover
Option 1: Convert the whole PDF to images and discard the rest. Wasteful but simple.
Option 2: Split the PDF to keep only page 1, then convert that to JPG or PNG. Faster, smaller, no leftover files. This is the cleaner workflow if you do this often.
Pick the right format
For most thumbnail purposes, JPG is fine — it's small, every system reads it, photo content compresses well. Use PNG if the cover has sharp text you want pixel-perfect, or if you need transparency anywhere.
A typical web thumbnail is 600px wide. At 150dpi a US-letter PDF page renders at about 1275×1650, which is more than enough to downscale to any thumbnail size cleanly.
Crop and scale after
Most thumbnail systems want a specific aspect ratio (16:9 for video-style thumbnails, square for social, etc.). Crop in your image editor or Preview/Photos after conversion. The converter gives you the full page; you decide how to frame it.
Use case: dynamic previews
If you're building a CMS that needs PDF thumbnails on the fly, look at the API rather than doing this by hand. The PDF-to-image conversion via API gives you a thumbnail in one call — useful for document management systems, knowledge bases, anything where users upload PDFs and you want a visual.
FAQ
Can I get just page 1 without splitting?
Converting the whole PDF and picking page-01 works fine; splitting saves processing time on long documents.
What size should the thumbnail be?
300dpi gives more than enough resolution to crop and scale to any thumbnail size. 150dpi is fine if file size matters.
JPG or PNG for thumbnails?
JPG for most cases (smaller, universal). PNG if the cover is mostly text or needs transparency.
Can the cover be used as a website image?
Yes — JPG and PNG both embed in any web page. Use whatever your CMS prefers.
Cover only, no fuss. Split the PDF then convert page 1 to JPG.