PDF to JPG: Choose the Right Resolution Before You Convert

A PDF looks fine on your computer, but the place where you need it accepts only JPG. A marketplace listing, a slide deck, a website preview, a WhatsApp message, a print shop that wants an image rather than a document. Converting a page to JPG is simple. Choosing the resolution is the part that decides whether the result is readable or useless.

A PDF page can contain text, vectors, images and links. A JPG contains pixels. Once the page becomes a JPG, the text is no longer selectable, the links are gone, and zooming in shows the resolution you chose rather than sharp type. That is fine for a preview. It is not fine for a document that someone needs to search or sign.

What changes when a PDF becomes a JPG

The visible page is rendered into a bitmap. Text becomes part of the image. Links, form fields, bookmarks and annotations do not survive. If the PDF has a transparent background, the JPG will usually show white where the transparency was, because JPG does not support transparency.

The PDF itself is not modified. You get a new image file and keep the original. That is useful: convert a copy for the website, keep the PDF for the official record.

The quality depends on two settings: DPI and JPEG quality. DPI controls how many pixels represent an inch of the page. Quality controls how aggressively the JPEG encoder throws away detail. A high DPI with low quality can look worse than a moderate DPI with high quality, especially around small text.

Pick the DPI by destination

For a small web preview or a thumbnail, 72–100 DPI is enough. The image will be a few hundred pixels wide, which is all a card or a chat preview needs.

For reading on a screen, 150 DPI is a good default. A4 becomes roughly 1240 × 1754 pixels, large enough to read comfortably and small enough to send. For a phone screenshot or a slide, 150 DPI is usually plenty.

For printing, 300 DPI is the standard for photographs and detailed pages. A4 at 300 DPI is about 2480 × 3508 pixels. The file will be larger, and the PDF renderer will take longer, especially on a phone.

Do not use 600 DPI unless the print shop specifically asks for it. It quadruples the pixel count compared with 300 DPI and rarely improves a normal document. For line art or a map with tiny labels, 300–400 DPI may help; test one page before converting a 100-page report.

Choose the quality setting

JPEG quality 0.9 is a sensible default for screen use. It keeps text edges reasonably crisp without producing an enormous file. For print, 0.95 is better. Below 0.7, text starts to show ringing and blockiness, especially around black letters on a white background.

If the PDF is mostly text, a lower DPI hurts more than a lower quality setting. A 100 DPI page with quality 0.95 still has too few pixels to read small print. A 200 DPI page with quality 0.8 is usually more readable.

If the PDF is a photo book or a product catalogue, the images inside already have a resolution. Rendering the page at 300 DPI cannot invent detail that is not in the source. It can only preserve what is there.

Convert one page or the whole document

Open the PDF to JPG tool. Select the PDF. Set the DPI and quality. Convert.

A one-page PDF downloads as a single JPG. A multi-page PDF is packaged in a ZIP with files named page-1.jpg, page-2.jpg and so on. Unzip it before uploading the images elsewhere. Check the order: the numbers should match the PDF pages, but a file manager may sort page-10 before page-2 if it sorts alphabetically. Rename with zero-padded numbers if the order matters.

If you only need one page, extract it first with Split PDF and convert that page. Rendering a 200-page document to get page 37 wastes time and memory.

On a phone

The steps are the same in Safari or Chrome. Choose the PDF from Files, set the DPI, convert, and download. A multi-page result arrives as a ZIP; iOS Files can unzip it, but the extracted images may be hidden in a subfolder. Look for a folder with the same name as the ZIP.

Phones have less memory. A 100-page PDF at 300 DPI can fail or close the tab. Use 150 DPI, convert in smaller PDFs, or move to a computer. If the browser warns about memory, do not ignore it; the tab may be killed mid-render.

When JPG is the wrong output

If the page contains transparency, a logo or a diagram with sharp edges, PNG is often better. JPG adds compression artefacts around text and lines. OpenToola’s PDF to JPG tool outputs JPG only; if you need PNG, use a PDF renderer that supports it or convert the JPG to PNG, accepting that the artefacts are already there.

If the page is a scanned document and you need to search the text, converting to JPG does not create a text layer. Run OCR on the PDF or on the image instead. A JPG of a scan is still an image of text, not text.

If the document must remain legally identical, do not replace the PDF with a JPG. Keep the PDF as the official file and use the JPG as a preview. A court, a bank or a portal may require the original format.

File size and sharing

A 150 DPI JPG of a text page is often 200–500 KB. A 300 DPI version can be several megabytes. If you need to send several pages, a ZIP of JPGs can be larger than the original PDF; the PDF already stores text efficiently, while each JPG stores a full image.

For email, convert only the pages the recipient needs. For a website, resize the JPG to the display size after conversion; a 300 DPI image displayed at 600 pixels wide is wasted bandwidth. Use Resize Image or Compress Image after converting.

For WhatsApp or a chat, the app may recompress the image again. Sending a 150 DPI JPG is usually enough; sending a 300 DPI file just gives the app more data to discard.

Colour and print

A PDF may use CMYK colours intended for professional printing. A JPG rendered by a browser is usually RGB. The colours can shift, especially saturated oranges, deep blues and brand colours. If you are preparing a file for a print shop, ask them which colour profile they require and whether they prefer a PDF. Converting to JPG may be the wrong workflow.

A browser also cannot reproduce spot colours, overprint settings or certain PDF transparency effects exactly. For a business card, a poster or a packaging proof, keep the PDF and let the printer handle it.

What to check before sending

Open the JPG at 100 % and read the smallest text. Check the edges of the page: a crop may cut off a footer or a page number. Check the colour of a logo against the original. Check the file size against the destination’s limit.

If the image is for a website, check how it looks at the size it will actually be displayed, not at 400 % zoom. If it is for print, check a proof on paper. A screen can hide softness that appears immediately in print.

Why not just take a screenshot?

A screenshot captures what is visible on your screen, at your screen’s resolution, including browser chrome if you are not careful. It may miss the bottom of a long page, and it cannot export a multi-page document in one go. For a quick one-page preview, a screenshot is fine. For a clean image of a full page, a PDF renderer is more reliable.

Printing to an image printer or using the operating system’s screenshot tool can also work, but the settings are scattered and the output size is unpredictable. A converter lets you choose DPI and quality directly. It also names the files consistently, which matters when you have 30 pages.

A note on scanned PDFs

If the PDF is already a scan, converting it to JPG does not add detail. The page is an image, and the converter re-encodes that image. Use a DPI high enough to preserve the original scan, but do not expect 300 DPI to make a blurry 100 DPI scan sharp.

If you need the text, run OCR on the PDF or on the JPG. If you need a smaller file, compress the JPG or convert it to WebP for the web. Keep the PDF as the master copy.

Privacy

The PDF is rendered in the browser. OpenToola does not upload it and does not keep a copy. The JPG is created locally and downloaded to your device.

A JPG may still contain metadata depending on the renderer, but a browser canvas export usually strips most of it. If the PDF contains sensitive information, treat the JPG with the same care: delete it after sending, avoid public computers, and do not upload it to a service you do not trust.

Tools mentioned

• PDF to JPG
• Split PDF
• Resize Image
• Compress Image
• OpenToola Guides