PNG to PDF Converter
Convert PNG to PDF in your browser. PNG files usually come from screenshots, design exports, logos and web graphics; PDF is the better fit for sharing, printing and submitting documents. You get a one-page PDF with the image embedded as a JPEG. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
PNG expected · other image formats also work
How to use PNG to PDF
- 1
Add your PNG files: drop them here, choose them, or paste from the clipboard.
- 2
Pick the colour that replaces transparent areas, since PDF has none.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .pdf files one at a time or together as a ZIP.
Why use Aback Images for png to pdf
Where the PDF goes next
PDF opens in every browser, operating system and office suite.
PDF next to PNG
A lossy PDF usually comes out far smaller than the PNG, which stores lossless DEFLATE with a prediction filter chosen per row.
The first lossy pass
The PNG holds 1, 2, 4, 8 or 16 bits per channel with nothing discarded yet. This conversion is the first lossy encode these pixels see, and hard edges and flat colour show it first.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
PNG vs PDF
What changes from PNG to PDF
Encoding: the PNG uses lossless DEFLATE with a prediction filter chosen per row; PDF uses per object: images inside are usually JPEG or Flate-compressed, and the download is a one-page PDF with the image embedded as a JPEG.
Bit depth: 1, 2, 4, 8 or 16 bits per channel in the PNG; PDF allows whatever the embedded images use, and the PDF written here has 8 bits per channel. 16-bit PNGs from photo and scientific software are reduced to 8 bits per channel.
Colour: RGB, greyscale, or an indexed palette of up to 256 colours in the PNG; PDF supports RGB, CMYK, greyscale or spot colours, written here as 8-bit sRGB.
Transparency: the PNG stores it as a full alpha channel, so edges and shadows can fade smoothly; the PDF has none, so transparent areas are filled with the colour you choose.
Metadata: the PNG can carry text chunks, an ICC profile, physical resolution and EXIF in an eXIf chunk; PDF can carry document info and XMP, but nothing is copied across.
About PNG
PNG stores pixels losslessly with full alpha transparency. It is ideal for screenshots, logos, UI and anything with sharp edges, but photos saved as PNG are several times larger than JPEG.
A PNG opens with an 8-byte signature and is a chain of chunks, each with its own CRC: IHDR (size, depth, colour type), optional PLTE and tRNS for palettes, one or more IDAT chunks with the compressed rows, and IEND.
PNG files usually come from screenshots, design exports, logos and web graphics.
About PDF
PDF is the standard for documents that look identical everywhere. Images placed in a PDF can be printed, emailed and combined into multi-page documents.
When converting PNG to PDF makes sense
PDF is the better choice for sharing, printing and submitting documents, while PNG suits screenshots, logos, graphics and anything that needs transparency.
PDF strengths: Opens identically on every device; Multiple pages in one file; Print-ready page sizes. Drawbacks to weigh: Not an image format: harder to edit or embed.
Limitations
- Text, icons and flat colour from a PNG are where lossy encoders struggle first: ringing and blur appear around hard edges, so keep the quality high for screenshots.
- A PNG that only holds flat colour can come out larger in a lossy format, because the lossy encoder spends bytes on detail the image does not have.
- The page matches the image size unless you choose a paper size, and the image is embedded as a JPEG.
- To put several images into one multi-page PDF, use Image to PDF.
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Frequently asked questions
Does converting PNG to PDF lose quality?
PDF is lossy, so detail the eye barely notices is discarded to save space. 16-bit PNGs from photo and scientific software are reduced to 8 bits per channel.
What happens to transparency when converting PNG to PDF?
PNG stores transparency as a full alpha channel, so edges and shadows can fade smoothly. PDF has no alpha channel, so transparent pixels are composited onto a solid colour, white unless you pick another. To keep transparency, convert to PNG, WebP or AVIF instead.
Can I put several images in one PDF?
This converter creates one PDF per image. To combine many images into one multi-page PDF with page size and margins, use Image to PDF.
Which apps open PDF files?
Every browser, operating system and office suite.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.