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PDF to images

Why does my PDF to PNG have a white background?

By DeckleUpdated

A PNG exported from a PDF in PDF to PNG always has a white background, because Deckle draws every page on white before it saves the image. A PDF page has no background colour of its own, and without the white fill most pages would come out as dark text on a transparent or black area. If you need transparency, export the PNG and remove the white in an image editor.

PDF to PNG

Same physical page, more pixels

150 DPI

Letter: 1,275 × 1,650 pixels

300 DPI

Letter: 2,550 × 3,300 pixels

Double each dimension → four times the pixels

Example calculation · nominal sizes for an 8.5 × 11-inch page. Actual exports depend on page geometry and rounding.

Why the background is white

In a PDF, the "paper" is not part of the page. Viewers such as Preview, Acrobat and your browser paint a white sheet behind each page before drawing the text and graphics, so you never notice. An image file has to decide what goes behind the content. Deckle fills it with white for two reasons:

  • Pages stay readable. Black text on a transparent background disappears in dark-mode apps, slide themes and chat windows.
  • PNG and JPG match. JPG cannot store transparency at all, so a white fill keeps both exports looking like the page you saw.

Pages that have a coloured background drawn as part of the design, such as a navy cover, keep that colour. Only the areas with nothing on them become white.

How to export a PNG and make the white transparent

  1. Open PDF to PNG and choose your PDF, or drop it onto the page.
  2. Under Resolution, choose Print (300 DPI). Extra pixels give cleaner edges after you remove the background.
  3. Under Pages, choose Choose pages and type the page with the logo, chart or drawing, such as 2.
  4. Choose Export images and download the PNG.
  5. Open it in an image editor and remove the white. Most editors have a "remove background", "magic wand" or "select colour range" tool.
  6. Crop to the part you need and save as PNG, which keeps the transparency.

Example: a brand guidelines PDF has the company logo on page 2. Export page 2 at Print, select the white with a colour-range tool, delete it, crop to the logo and save. You now have a transparent logo for a slide or web page.

Things to check after removing the white

  • Edges. Anti-aliased text and curves blend into white, so a hard removal can leave a pale fringe. It shows up against dark backgrounds; view the result on a dark colour before using it.
  • White inside the artwork. A white fill inside a logo or chart is white too. Removing every white pixel punches holes in it, so select the outer background only.
  • Size. A transparent PNG of a whole page at Print is large. Crop it to the part you need.

If the original artwork exists as a vector file, such as an SVG or EPS from the designer, that is a better source for a transparent logo than a page export.

Tips

  • Ask for the original file first. Logos and diagrams usually exist outside the PDF in a format that already has transparency.
  • Use Print for anything you will cut out. More pixels give smoother edges.
  • Keep JPG out of this. JPG has no transparency and adds blur around edges that makes removal harder; use PDF to PNG.
  • Check it on dark and light. Place the image on both before you publish it.

Frequently asked questions

Can Deckle export a PNG with a transparent background?

No. Every page is drawn on white. Remove the white in an image editor if you need transparency.

Why is my PDF to JPG also white?

JPG cannot store transparency, so every JPG export is drawn on white too.

Why did another converter give me a black background?

Some converters leave the background undefined, and apps show undefined areas as black or transparent. Deckle fills it with white so the page looks the same everywhere.

Can I put the exported page on a dark slide?

Yes, but it will show as a white rectangle. Either keep a white box behind it on purpose, or remove the white first as described above.

Will a page with a coloured background stay coloured?

Yes. Colours that are part of the page design are kept. Only empty areas become white.

Related tools

  • PDF to PNG to export a page as a lossless image
  • PDF to JPG for smaller images where transparency is not needed
  • PNG to PDF to place a finished PNG back on a PDF page

Sources