Convert PNG to PDF — Free PNG to PDF Converter
Free PNG to PDF conversion, batches included — everything runs on your device.
This pair has a catch we would rather state than hide. Our PDF pages embed the image as JPEG at quality 92, so a lossless PNG picks up JPEG artifacts it never had, and any transparency is flattened onto white before that happens. On a photograph you won't spot it. On a screenshot full of text, or a diagram built from flat color, you will, and this is the one conversion here that genuinely costs you something.
How to Convert PNG to PDF
Select your PNG files
Drop images in — every common format works.
Convert to PDF
Runs automatically; open advanced settings to tune quality.
Download
Save files singly or as one ZIP.
Why Convert PNG to PDF?
Need to turn a screenshot, graphic, or design into a shareable document? Converting PNG to PDF wraps your image in a format that is accepted everywhere for official submissions, printing, and archiving. PDFs are the standard for documents that need to look the same on every device.
The conversion preserves your PNG at full quality — the image is embedded without re-compression. The PDF page size matches your image dimensions exactly. This makes it perfect for receipts, certificates, screenshots for documentation, and design exports.
The PDF is assembled by code running in the page — your screenshots and graphics are never handed to a server or a third party. It is free, immediate, and account-free.
For the sharpest printed results, use high-resolution PNG files. If you need smaller PDF files, compress your PNG before converting. Need a photo format instead? Try PNG to JPG for universal compatibility.
Compress your images first · JPG to PDF · PDF to Text — Free Online Text Extractor
What changes going from PNG to PDF
This is the direction where the PDF page costs you something. LeanImg composites any transparent pixels onto white rather than the black they would otherwise take, encodes the result as a JPEG at quality 92 with the browser's encoder, and drops that single image onto a page sized to the PNG's pixel dimensions. The lossless PNG becomes a lossy image inside the PDF: flat colour picks up faint ringing at hard edges and thin text can show a slight halo when zoomed in.
File size can go either way. A photographic PNG, usually far larger than it needs to be, typically shrinks a great deal once it is JPEG inside the page. A screenshot or diagram made of flat colour and sharp text can come out larger than the PNG it started from, since JPEG is poorly suited to that content.
A 16-bit PNG is reduced to 8 bits per channel when it is decoded through the browser canvas, the PNG's gamma, text and ICC chunks are discarded, and the page carries no DPI hint from the file, so its printed size depends on the viewer's fit-to-page logic rather than anything the PNG declared. Transparency cannot be represented on the page at all on this path, even though PDF itself has been able to hold it since version 1.4.
Don't do this for a transparent logo or a UI mock-up that must be reproduced exactly; send the PNG, or place it in a document editor that keeps the original stream. Use it when a portal insists on a PDF and the content is a photo or a scan.
PNG vs PDF
| Feature | PNG | |
|---|---|---|
| File Type | Image | Document |
| Use Case | Graphics, screenshots | Documents, archiving |
| Transparency | Yes | Preserved in PDF |
| Device Support | Universal | Universal |
| Printing | Basic | Professional |
| Sharing | As image | As document |
What is a PDF file?
PDF is a page description format Adobe shipped in 1993 and handed to ISO in 2008, where it lives as ISO 32000. It belongs in a converter because it's where images go when they need a physical page size. There's no such thing as PDF compression: every image stream inside declares its own filter, so a careful JPG to PDF converter can copy the JPEG in byte for byte and be genuinely lossless. Transparency depends on the header version, since alpha only arrived in PDF 1.4 in 2001.
| Released | 1993 by Adobe. ISO 32000 since 2008 |
| Compression | Per stream. Each embedded image declares its own filter |
| Transparency | 8 bit alpha through /SMask, only in PDF 1.4 and later |
| Color depth | Up to 16 bits per component, only in PDF 1.5 and later |
| Page size | Stored in points, independent of pixel count. It sets print DPI |
| MIME type | application/pdf |
How to open a PDF file
PDF needs an embed, object or iframe and a real viewer rather than an img tag, but every platform ships one anyway. macOS Preview renders, annotates, reorders and merges pages; Edge is the default handler on Windows 10 and 11; Linux has Evince, Okular and Firefox's PDF.js. For extraction work, poppler-utils gives you pdftoppm to rasterize pages and pdfimages to pull the embedded originals back out at full quality.
Convert other formats to PDF
Convert PNG to other formats
Frequently Asked Questions
How to convert PNG to PDF?
Add PNG images to the LeanImg converter and a PDF is produced for each one, built right on your device. Free, no account, nothing transmitted; several files can be processed together.
Is it safe to convert PNG to PDF online?
Yes. PDF assembly happens locally in the browser, so screenshots of personal information never reach a server — there is none in the pipeline to reach.
How to convert PNG to PDF on Windows?
Any Windows browser can do this — no Acrobat, no installs. Open the converter, add PNG files, and save the PDFs it generates on the spot.
Is the PNG quality preserved in the PDF?
It is preserved bit for bit: the image goes into the PDF without being re-encoded, and the page takes on the PNG's exact dimensions. What you print or share is precisely what you converted.