A client asks you to send over a few pages from your product catalog as images they can post on their website. They need JPG files, not PDFs. The images need to be at the right resolution for the web, clear and sharp, but not so large that they slow down the page loading. You have the catalog as a PDF. Converting the specific pages to JPG images takes seconds.
Converting PDF to Image to JPG is the right choice for web and social media use where file size matters and the content is primarily photographic or visually rich. JPG compression produces small files at good quality, which is exactly what websites and social platforms need.
Choosing JPG vs Other Formats for Web and Social Media
For web images, JPG is the standard format because it produces the smallest file sizes at acceptable quality. A letter-sized page at 150 DPI exported as JPG at 85% quality is typically 150 to 400 KB. The same page as PNG is 500 KB to 1.5 MB. The JPG version loads faster on websites and consumes less bandwidth for mobile viewers. The quality difference between JPG at 85% and PNG is imperceptible for most content on a screen.
The JPG format uses lossy compression, which means some image detail is discarded to achieve smaller file sizes. For text-heavy pages, this can produce visible artifacts around letters. For photo-heavy pages, the artifacts are much less visible. If the page is mostly text, consider PNG instead. If the page is a photograph, product image, or design mockup, JPG is the right choice.
Setting the Right Resolution for Web Use
Resolution for web images is measured in pixels, not DPI. A website displays images at the pixel dimensions you specify. Instagram posts are 1080 by 1080 pixels. Twitter images are 1600 by 900 pixels. LinkedIn posts are 1200 by 627 pixels. A standard blog image is 1200 by 630 pixels for social sharing cards. Match the export dimensions to the platform's recommended size.
WukongPDF's image export lets you specify exact pixel dimensions. Enter 1080 by 1080 for Instagram. Enter 1600 by 900 for Twitter. The tool renders the page at the specified dimensions. The aspect ratio of the PDF page may not match the target dimensions. If it does not, crop the page to the target aspect ratio before exporting, or accept that the image will have white bars or be cropped by the platform after upload.
For general web use where you do not have a specific platform dimension, export at 150 DPI. A letter-sized page at 150 DPI produces a 1275 by 1650 pixel image. This is larger than most websites display images, giving you the flexibility to resize down. Uploading an image that is larger than the display size is fine. The website scales it to fit. Uploading an image that is too small results in a blurry, pixelated display when the website attempts to upscale it.
Optimizing JPG Quality for Web Performance
JPG quality is set as a percentage, typically 60% to 100%. Higher percentages preserve more detail but produce larger files. For web use, 80% to 85% is the sweet spot. The image looks sharp on screen. The file size is reasonable. Below 75%, compression artifacts become visible as blocky patterns in areas of smooth color. Above 90%, the file size increases significantly with minimal visual improvement.
WukongPDF defaults to 85% quality for JPG exports, which balances quality and size for general use. Adjust higher for images where fine detail matters, such as a product photo where the customer needs to see texture. Adjust lower for images where the visual content is simple and the fastest possible loading time is the priority.
Uploading and Verifying on the Target Platform
After exporting, upload the JPG images to the target website or social media platform. View them on the platform after upload. Check that the images are sharp and the colors are accurate. Check that the platform did not apply additional compression that degraded the quality. Many social media platforms recompress uploaded images. If the recompressed version looks worse than your original, try uploading at a higher quality setting so that the platform's compression has more detail to work with. The Digital Publishing workflow ends when the images look correct in their final context. The PDF was the source. The JPG is the delivery format. The website or social media post is where the audience sees it. Verify quality at every step.
After confirming the images are correct on the target platform, keep the exported JPGs in an organized folder. If the client requests different dimensions or a different format later, you can re-export from the original PDF. The PDF Export to JPG is non-destructive. The original PDF remains unchanged. You can generate as many image variants as needed from a single source file. A practical workflow for organizations managing social media across multiple platforms: export the same PDF page at multiple resolutions in one batch. Set up presets for each platform: Instagram at 1080x1080, Twitter at 1600x900, LinkedIn at 1200x627, Facebook at 1200x630. Run all four exports from the same source page. Name each output file with the platform and dimensions: catalog-page5-instagram-1080.jpg, catalog-page5-twitter-1600.jpg. The batch presets turn platform-specific image preparation from a per-post configuration task into a one-click operation. The tool remembers your last used export dimensions for each format, functioning as de facto presets for your most common social media destinations. Consistency in e-commerce product images in image dimensions across all products in a catalog improves the browsing experience. If product A is shown at 1080 pixels wide on a white background and product B is shown at 900 pixels wide with a gray background, the catalog page looks sloppy. Export all product images from the PDF catalog at the same pixel dimensions and with the same background treatment. The batch image export applies the same settings to every page, ensuring visual consistency across the entire product line.