PDF to JPG comes out blurry or small: which DPI to pick, and when to use PNG

Text in a PDF is redrawn every time you zoom, so it stays sharp at any size. An image is a fixed grid of pixels, set at the moment you convert. Blow it up past that grid and it goes soft. Nearly every "my PDF to JPG is blurry" complaint comes down to the grid being too small.

Why the image comes out blurry or tiny

The size of the grid is set by the resolution, usually given in DPI (dots per inch): how many pixels the converter draws for each inch of the page. A US Letter page is 8.5 by 11 inches, so at 72 DPI it becomes a 612 × 792 pixel image. Stretch that to fill a phone or laptop screen and every pixel gets smeared across several.

An A4 page comes out at about 1240 × 1754 at 150 DPI and 2480 × 3508 at 300. Doubling the DPI quadruples the pixels, and file size and conversion time climb with them, so pick for the job rather than maxing it out.

Which DPI for what

Print is where people get caught out. This Mac user was laying out a portfolio for an online print service:

That post contains the whole rule: pixels = inches × DPI. Ten inches at 300 DPI is 3,000 pixels. The poster's own fallback, exporting a PDF and saving each page as a 300 DPI JPG, is exactly the fix. When a printer or an upload form asks for a DPI, check the pixel count; the DPI value stored in a file's properties varies from tool to tool and means little by itself.

• Email, messaging, reading on screen: 150. Use 200 if the print is small.
• Instagram and other social media: 150 is plenty. Instagram's help center says it uploads photos at the best resolution possible "up to 1080x1080 pixels", so anything bigger gets scaled down.
• PowerPoint or Word: 150 to 200. Microsoft's help says the default picture resolution in Microsoft 365 is 220 ppi, so much higher than that may be reduced once it is in the document.
• Printing, drawings, small tables people will zoom into: 300.
• Upload forms that only take JPG, such as job applications or contest entries: these usually have a size cap too. If the file is over it, drop the DPI a step before touching JPG quality.

JPG or PNG for text and diagrams

JPG saves space by cutting the picture into 8 × 8 pixel blocks and throwing away detail you are unlikely to notice. On photos that works well. On black text against white paper, the sharp edges leave a faint speckled halo around every letter, sometimes called mosquito noise. Higher quality settings reduce it but never remove it.

PNG keeps every pixel exactly, so letters, table rules and chart labels stay clean. Two caveats. PNG adds no pixels, so an image that is blurry because the DPI was too low stays blurry as a PNG; fix the resolution first. And pages full of photos come out several times larger as PNG than as JPG, so JPG at 85 to 90% quality is the better choice there.

Transparent background

Converting a PDF to PNG does not give you a transparent background, even if the PDF was made with one. A designer on the Adobe forum ran straight into this:

The reply was blunt: "Acrobat doesn't have any transparent export. PDF files are always rendered on white." PDF pages are drawn as if printed on white paper. For a logo or shape on a transparent background, export the PNG from the program that made it, not from the PDF.

Why a screenshot of a PDF looks worse

A screenshot records the pixels your screen is showing at that moment. Fit a whole Letter page on a 1920 × 1080 monitor and it gets under 1,000 pixels of height, which works out to roughly 90 DPI or less. The viewer has also already shrunk and smoothed the text to fit, so the capture inherits that softness. If you have to capture, zoom in until the part you need fills the screen and capture only that part. Every step of zoom adds pixels.

What Preview, Acrobat and Windows give you

On a Mac, Preview does it with no extra software: open the PDF, choose File > Export, and pick JPEG or PNG from the Format pop-up menu. Apple's guide for macOS Tahoe 26 mentions a quality slider for JPEG and nothing about resolution, but user reports show a Resolution field in pixels/inch in the same dialog. One Apple Community user on Big Sur changed it from 72 to 300 and still got images that were "very low quality", so check the pixel size of what you export. The bigger catch is page count:

We found no way in Apple's guide to export every page of a PDF as images in one go.

Adobe Acrobat Pro handles it: File > Export To > Image, then JPEG, with a Settings button for resolution (an Adobe blog post walks through 600 DPI). With several pages, Adobe says "each page will be saved as a separate image file." It is a paid plan, listed at $19.99 a month on an annual plan on Adobe's US Export PDF page; the free Acrobat Reader is pitched for viewing and sharing. Adobe's online converter has a history here. In a 2017 Adobe Community thread with 19,543 views, a PDF Pack buyer said "regardless of which image quality I select it comes out the same poor quality (low) and image size", and a community expert found it always produced 1,024 pixels on the long side. We could not confirm whether that still holds.

On Windows we found nothing built in that exports PDF pages as image files. When someone asked on Microsoft's Tech Community in August 2026, the no-install suggestion was the Snipping Tool, which is the screenshot route above.

Just one page, or 30 files in the wrong order

Most converters make one image per page, so a 30-page PDF gives you 30 files. If you only need one page, either pull that page out into its own PDF and convert that, or convert everything and keep the one you want. The first is quicker when the document is long or the DPI is high.

Pull the pages you need out of a PDF

Then the names. Anywhere that sorts names character by character puts page1, page10, page11 and page2 in that order, which scrambles a set of images you upload or attach one after another. Names with zero-padded numbers (01, 02 … 30) sort correctly everywhere.

Using the PDF to JPG tool on this site

The PDF to JPG and PDF to PNG tools take one PDF at a time and offer 72, 96, 150, 200 or 300 DPI, with 150 preselected. JPG has a quality slider from 40 to 100% (starting at 90%); PNG is lossless and has none. Press Convert and every page is drawn in turn. The result page shows each image's pixel size and file size, names them like report_01.jpg (zero-padded once a PDF has ten or more pages) so the order holds, and offers "Download all (ZIP · 30)" when there is more than one. Everything runs in your browser and the PDF is not uploaded. It works in a phone browser too, though PDFs over 40MB trigger a warning that the phone may run out of memory.

What it will not do: pick pages (use Split PDF first), go above 300 DPI, or keep a transparent background, since PNG output is filled with white too. If the JPGs are still over an upload limit, Compress images takes a whole batch and lowers the quality.

Convert a PDF to JPG