PNG to PDF

Runs in browser PDF Conversion

Turn one or many PNG files into a single PDF. Pixels are kept lossless and transparent areas stay transparent; choose a page size, margins and fit, then download.

Privacy: Processed locally in your browser. Your file is not uploaded.

When should PNG, JPEG or WebP be used?

PNG is lossless with transparency, right for screenshots, diagrams and anything with sharp edges or text; JPEG is lossy and much smaller for photographs; WebP offers both modes at roughly 25–35% smaller sizes than the older formats and is supported by every current browser. Converting a page to an image fixes its appearance but loses the text layer, so the choice depends on whether the result must stay searchable.

How to use PNG to PDF

  1. Drop your PNG files.
  2. Choose the page size and margins.
  3. Click "Convert to PDF".
  4. Download the PDF.

PNG to PDF features

  • Lossless: pixels are stored exactly
  • Transparency preserved as a soft mask
  • Page size fitted to the image or fixed paper sizes
  • PNGs are never turned into JPEG; the JPEG option applies only to other formats
  • Batch of any size within the device limit
  • Local processing

PNG to PDF example

Screenshots to a fit-to-image PDF

Input:

3 × PNG (1920×1080), page size: fit each page to its image

Output:

screenshots.pdf — 3 landscape pages at 96 DPI (20 × 11.25 in)

Frequently asked questions about PNG to PDF

Is PNG transparency preserved?

Yes. The alpha channel is embedded as a soft mask, so transparent regions show the page background (white by default, or whatever a background tool adds later).

Why is my PDF larger than the PNG files?

The PNG pixels are stored losslessly, and the PDF re-compresses them with plain Flate, which can come out larger than the original PNG file. PNG files are never converted to JPEG here (the JPEG option only applies to other formats), so if a smaller, lossy file is acceptable, run Compress PDF afterwards with image re-compression.

What happens with very large images?

Images up to 80 megapixels are accepted; a larger one is reported and skipped so the browser does not run out of memory.

Is my PDF uploaded to a server?

No. The file is opened and processed by your browser with WebAssembly and JavaScript; nothing is sent to Mutqan Soft or anyone else. Close the tab and the file is gone. Downloading the result needs a free account — no subscription, no payment.

What are the size limits?

Up to 250 MB and 2,000 pages per operation on a desktop browser, 60 MB and 500 pages on a phone, because everything runs in your device’s memory. The tool tells you before it starts if a file is over the limit.

Technical notes

PNG data is decoded to raw pixels by pdf-lib and embedded as a FlateDecode image with a separate SMask for the alpha channel. Images over 80 megapixels are refused before decoding to protect the browser’s memory.

References