Convert PNG Images to PDF
Combine one or more PNG images into a single PDF document.
How to use PNG to PDF
- Choose the PNG files you want to combine.
- Arrange the pages in the correct order.
- Select the page size for each page.
- Click "Create PDF" to download the document.
Features
- Transparency is preserved
- Lossless from source to PDF
- Unlimited PNGs in one file
- Page size chosen per document
Files are processed in your browser and never leave your device.
About PNG to PDF
PNG to PDF is the standard way to turn a set of scanned pages or screenshots into one document. PNGs keep their sharpness, so text and diagrams stay crisp, and any reader can open, print and share the result. Arrange the screenshots in reading order first; that order becomes the page order.
Sharpness Matters
PNG exists because JPEG's lossy compression is wrong for certain content. Interface screenshots, code samples, charts, scanned text and technical diagrams all contain hard edges and flat colour regions that JPEG smears with ringing artefacts, especially at moderate quality settings. PNG stores every pixel losslessly, so converting PNGs to a PDF and printing or zooming in leaves the text as crisp as it was on screen. When the content of the image is information rather than a photograph (a settings dialog, a terminal session, a spreadsheet capture) the PDF should carry that fidelity forward, not average it away.
Transparency Without Compromise
Many PNGs contain an alpha channel: transparent backgrounds around a logo, a cut-out product shot, a diagram layered over a checkerboard. Converting to PDF while discarding that alpha channel forces every transparent pixel to white, which can leave awkward boxes around icons and diagrams that were designed to sit on any background. This converter carries the alpha channel through into the PDF, so transparent regions remain transparent when the page is viewed on screen or composited over another colour. For brand assets, presentation graphics and layered design exports, that is the difference between a usable archive and a file that has to be redone.
When to Choose PNG Over JPG
The rule of thumb: photographs and continuous-tone images go to JPG; anything with text, line art, screenshots or transparency goes to PNG. A JPG of a screenshot of code will have mushy characters at 100 % zoom; a PNG of the same screen will be razor-sharp. A PNG of a beach photo will be three to five times larger than a JPG of the same scene with no visible benefit. When you are assembling a multi-page document, pick the source format that matches the content of each page, or, if the pages are already mixed, use the universal images-to-PDF tool and let it place each file on its own page without forcing a single format.
Real cases
Six real-world scenarios where people rely on PNG to PDF.
A QA team archiving bug-report screenshots
A mobile QA engineer captured every reproduction step as PNG screenshots, the error dialog, the console log, the broken layout. The team compiled each bug's evidence into a single PDF attached to the ticket. Support could open the file on any device without hunting through image folders, and the screenshots stayed sharp enough to read fine print in the error text.
A product designer shipping a style-guide PDF
A designer exported logo variants and UI component screenshots as PNGs, keeping the transparent backgrounds intact. Merging them into a PDF produced an archive that still showed the logos correctly over any page colour when developers zoomed in or printed the document. The alpha channel survived the conversion, which a flat JPEG export would have destroyed.
A teacher collecting diagram worksheets as one file
A high-school science teacher photographed student-drawn cell diagrams and saved the images as PNGs for maximum sharpness. Combining the day's submissions into one PDF made grading faster, the teacher scrolled a single document instead of opening dozens of separate image files, and the lines and labels stayed crisp on the tablet used for marking.
A developer archiving terminal sessions for a postmortem
After a production incident, a developer saved the relevant terminal windows and monitoring charts as PNG screenshots. Those images were merged into a timeline PDF that walked through the outage step by step. Reviewers zoomed into the log output without pixelation, which would have been impossible with lossy JPEG captures.
A researcher packaging microscopy figures for review
A biologist exported fluorescent microscopy figures as high-resolution PNGs, where every pixel of the stain pattern mattered. Assembling the figures into a single PDF for peer review kept the images lossless from capture to submission. The reviewer's comments could reference exact page numbers, which a folder of images made awkward.
A librarian digitising archive index cards
A small-town library scanned its handwritten index cards as PNGs, choosing the lossless format to preserve the fading ink. Merging each drawer's cards into a PDF gave volunteers a searchable-by-page archive that could be printed or shared with the historical society. The transparency setting on a few transparent overlays was carried through without forcing them to white.
Frequently asked questions
Will the transparent areas become white?
No. The alpha channel is carried through, so transparent PNGs stay see-through in the PDF.
Is this different from the JPG to PDF tool?
Yes, the same engine, but PNG keeps transparency and sharp edges. Pick JPG for photos and PNG for screenshots and diagrams.
What happens to transparency?
Transparent areas are composited onto white because a PDF page has no alpha channel. A coloured background belongs in an image editor before conversion.
Can I keep the original pixel size?
Yes, choose a page that matches the image. Otherwise the PNG is scaled to fit while keeping its aspect ratio.
Is PNG better than JPG for scans?
For line art and screenshots, yes. For a photographed page, JPEG is smaller and the difference is hard to see.
Why is the PDF larger than the PNGs?
Each image is embedded at full resolution plus a small amount of page structure, so the total sits close to the sum of the source files.
Can I combine PNG and JPG in one PDF?
Yes, through Images to PDF. This tool is tuned for PNG, but the mixed tool accepts both without changing the workflow.
Related tools
Other utilities that work the same way, fully offline.
PDF to Word
Turn any PDF into a Word document that matches it page for page, or rebuild it as editable text.
Open tool →PDF to Excel
Convert PDF tables and statements into a live Excel workbook.
Open tool →PDF to PPTX
Turn a PDF report into an editable PowerPoint deck, one slide per page.
Open tool →PDF to JPG
Render each page of a PDF as a JPEG image at a resolution you choose.
Open tool →PDF to PNG
Render each page of a PDF as a PNG image at a resolution you choose.
Open tool →PDF to WebP
Render each page of a PDF as a WebP image for modern web use.
Open tool →