The format you convert to depends entirely on what you are doing with the images:
| Use Case | Best Format | Why | Typical Size (per page) |
|---|---|---|---|
| Email / messaging | JPG | Smallest files, universal support | 100-300KB |
| Presentations / documents | PNG | Crisp text, no compression artifacts | 300KB-1MB |
| Website / blog | WebP | Smallest with good quality | 80-200KB |
| Social media post | JPG or PNG | Photos→JPG, text-heavy→PNG | 150-500KB |
| Print (poster/flyer) | PNG at 300 DPI | Lossless quality for print output | 1-5MB |
| Archival / backup | PNG | Lossless — no quality degradation over time | 300KB-2MB |
Multi-page PDFs produce one image per page. A 10-page document becomes 10 images. For emailing, you can convert to images and then recombine specific pages back into a smaller PDF if needed.
The size of the output image depends on the PDF page dimensions and the DPI you choose:
| PDF Page Size | 72 DPI (screen) | 150 DPI (standard) | 300 DPI (print) |
|---|---|---|---|
| Letter (8.5×11) | 612×792 px | 1275×1650 px | 2550×3300 px |
| A4 (210×297mm) | 595×842 px | 1240×1754 px | 2480×3508 px |
| Legal (8.5×14) | 612×1008 px | 1275×2100 px | 2550×4200 px |
Rule of thumb: 150 DPI is ideal for screen viewing and sharing. 300 DPI for anything being printed. 72 DPI for thumbnails and previews only.
If the converted image is too large for your upload limit, compress it after conversion. Going from 300 DPI PNG to 85% JPG typically reduces file size by 80%.
The browser-based tool works on every platform, but here are notes for each:
A 50-page PDF produces 50 separate images. Managing these efficiently:
page-1.jpg, page-2.jpg, etc. Rename the folder to match your document name for organization.For bulk conversion of multiple PDFs (not just pages within one PDF), process each file separately. Converting a 10-page PDF takes about 5 seconds — 10 PDFs take under a minute.
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