PDF to PNG Converter

What PNG gives you

Every page of the PDF becomes a PNG image, one file per page, rendered at the scale you choose. PNG is lossless: the pixels the browser draws are the pixels in the file, with no compression artefacts around letters, no colour drift and no softening on repeated saves.

That makes it the right output for documents rather than photographs — contracts, articles, code, tables, diagrams, slides and screenshots. The price is size: for a photo-heavy page, a PNG can be several times larger than a JPEG of the same page, because lossless compression cannot throw away detail.

No quality slider, and why

The quality field on the panel does nothing for this format. PNG has no quality dial; its compression is a lossless dictionary pass over the pixel data, and every pixel survives. The field stays visible because the panel is shared with formats that do use it, but for PNG the only control that matters is the render scale.

That is a feature, not a limitation. There is no setting to get wrong, no trade to reason about, and no visible degradation if you render the same page ten times. If a page comes out soft, the cause is always resolution, never compression.

Entirely in the browser

The PDF is read locally by PDF.js, each page is drawn to a canvas, and the canvas is exported as PNG. Nothing is posted to the server: not the document, not the page images. Compared with the GIF and BMP modes of this converter, which send each rendered page away for encoding, PNG is the most private option, and it is also the fastest per page because there is no round trip.

The download is assembled from a blob, and ZIP export uses the same blobs, so the archive is built locally as well.

Transparency, and the surprise it can cause

PNG supports an alpha channel, and the canvas keeps one. If a PDF page paints a white background, the output looks like ordinary paper. If a page does not paint its own background — some exports, some forms, some slides — the untouched areas stay transparent in the PNG.

On a white viewer this is invisible. On a dark website, in a dark-mode editor or pasted onto a coloured slide, those areas show through as the background colour, which can make text unreadable. If you need a guaranteed white page, open the PNG in an editor and flatten it onto white, or choose JPEG, which has no alpha channel and fills the page with a solid colour at the cost of some sharpness.

For logos, stamps, signatures and cut-out graphics, the same property is exactly what you want: the transparent area is preserved and the image drops cleanly onto any background.

Choosing the scale

Scale is the only meaningful decision.

• 100 percent matches the page's CSS size — about 794 by 1123 pixels for A4. Good for reading on a laptop and for most web uses.
• 150 percent gives a comfortable margin for zooming and for high-density screens. Roughly 1190 by 1684 pixels on A4.
• 200 percent reaches about 1588 by 2246 pixels, near 300 DPI when printed at A4. This is the usual choice for anything destined for paper.
• 300 percent is for large sheets, fine drawings or cropping. Files get big quickly, and browser memory becomes the constraint.

Below 100 percent is fine for thumbnails and contact sheets, but small type stops being legible around 50 percent. Because PNG has no quality loss, rendering at a higher scale is a clean way to get a version you can crop without immediately running out of pixels.

Running a conversion

1. Add a PDF by drag and drop or by clicking the upload area.
2. Check the format selector says PNG, then enter the scale percentage.
3. Press Render Pages. The loop renders every page and reports progress.
4. Preview the cards. In this mode the thumbnail is the actual PNG, so what you see is what downloads.
5. Mark pages individually, by range, or with Select all.
6. Download single files or export the marked pages as a ZIP.

Output names follow the source: thesis-page-12.png, with unsafe characters replaced by hyphens. The ZIP is thesis-selected-pages.zip. Page numbers in the names make it easy to restore order after extracting.

Managing size

PNG files of text pages are usually modest — a page of black type on white compresses very well. The trouble starts with photographs, gradients and screenshots of colourful interfaces, where every subtle shade needs bytes.

If size matters, the levers are, in order: reduce the render scale, crop the page before converting if only part is needed, convert photo pages to JPG instead, and run the resulting PNG through a lossless optimiser that strips metadata and improves the compression without touching pixels. What you should not do is re-save the PNG as a low-quality JPEG and back again; that trades a permanent loss for a temporary saving.

A hundred-page document at 200 percent can produce hundreds of megabytes. For long reports, convert the pages you need rather than the whole file — though note that rendering still covers every page, so the saving is in downloads and disk, not in render time.

PNG against the alternatives

The rule of thumb: if the page is mostly flat colour and hard edges, PNG. If it is mostly continuous tone, JPEG. Mixed documents often deserve both.

Limits

One PDF per run, all pages rendered, one still image per page, no animation, no OCR, no text layer, no DPI metadata and no embedded colour profile beyond the canvas default. Password-protected PDFs cannot be opened. There is no background colour option, no margin or padding control, no page rotation, no merge and no batch queue across several files. Practical page size is bounded by browser memory rather than a stated maximum.

Privacy

Rendering, encoding, previewing and zipping all happen on your device. Nothing about the document is transmitted, which makes this the format to choose for confidential PDFs when you need an image output. The files you save afterwards are ordinary images; store and share them with the same care as the original.

Common mistakes

• Changing the quality field and expecting a difference. PNG ignores it.
• Assuming a transparent page will look white everywhere. It shows the background of whatever it is placed on.
• Rendering at 40 percent for reading. Resolution, not compression, is what makes text legible.
• Converting a photo album to PNG. The files will be enormous; JPEG is the better tool.
• Re-saving the PNG repeatedly in an editor. Harmless for quality, but each save may change metadata and file size.
• Expecting selectable text. The output is a picture of the page.

Frequently Asked Questions