PNG To PDF
Convert PNG images to PDF in seconds. Upload one or multiple PNG files, arrange the page order, and download a clean PDF—perfect for screenshots, scanned pages, design assets, and document sharing. Fast, secure, and free to use with no registration required.
PNG to PDF Converter
The PNG to PDF Converter turns PNG image files into PDF documents. Upload one or multiple PNG files, set the page size, orientation, margin, and whether to combine all images into a single PDF or produce individual files, then click Convert to PDF and download the result. The conversion runs in the browser and requires no software installation.
PNG is the preferred format for screenshots, UI designs, diagrams, charts, and any image containing text or sharp-edged graphics. Its lossless compression means every pixel is preserved exactly, producing PDF pages where text is crisp, icons are sharp, and fine details are fully visible. This makes PNG to PDF the right choice whenever output quality and readability are the priority.
How to use the PNG to PDF Converter
- Click Select a File or drag and drop your PNG images into the upload area. You can upload multiple files at once — guest users up to 5 images (10 MB each), registered users up to 20 images (40 MB each).
- Configure the page size, orientation, and margin. The settings reference table below explains every option and the situations each is suited for.
- Choose whether to merge all images into one PDF (the most common choice for multi-page documents) or produce a separate PDF per image. The Merge toggle controls this.
- Set the page order if you uploaded multiple images. The output PDF follows the sequence shown in the upload area. Rename files with numeric prefixes (01-, 02-, 03-) before uploading to control sequence via alphabetical sort.
- Click Convert to PDF. Download the result and verify page order, image quality, and transparency rendering before sharing or submitting.
Why PNG produces sharper PDF output than JPG for certain content
PNG and JPG take fundamentally different approaches to storing image data, and this difference has a direct effect on the quality of the resulting PDF.
JPG uses lossy compression: when a JPG file is saved, the algorithm discards some image data — particularly fine detail around sharp edges — to achieve a smaller file size. The result is visible as compression artefacts: blocky patches, smearing around text characters, and blurring at the edges of icons and lines. The higher the compression, the worse the artefacts. For photographs, the eye barely notices these losses because photographic content is smooth and varied. For screenshots, UI designs, and text-heavy images, the artefacts are clearly visible and reduce readability.
PNG uses lossless compression: the algorithm reduces file size by identifying patterns in the data, but it never discards any information. Every pixel is stored exactly as it was in the original. A screenshot of an application menu, a diagram with fine lines, or a mockup with precise UI elements will look exactly the same in a PNG-converted PDF as it did in the original image. This is why PNG is the standard format for software screenshots, design exports, and any image where visual precision matters.
PNG transparency and how it renders in PDF
One of PNG's key features is alpha channel transparency: areas of the image with no background color are stored as transparent rather than white or any other color. This is why logos and design assets are commonly distributed as PNG — the transparent background means they can be placed on any colored surface without a white rectangle appearing behind them.
When a transparent PNG is converted to PDF, transparent areas are typically rendered as white. This is because PDF pages have a white background by default, and the transparent areas of the PNG image reveal that white background. For most practical purposes — screenshots, UI designs, diagrams with white backgrounds — this produces the correct result.
If your PNG has a transparent background and you expect the PDF page to show through (for example, you want the PDF page background to be a color other than white, or you are merging a transparent design element with a colored page), standard conversion tools will not achieve this. The transparent areas will appear white in the PDF output. If this is a concern, add the desired background color to the PNG before converting — in any image editor, fill the transparent layer with the background color you want, export as a new PNG, then convert. This is the simplest way to control what appears in transparent areas.
PNG vs JPG — when to use each format for PDF conversion
| PNG | JPG / JPEG | |
| Compression type | Lossless. Every pixel is stored exactly. No quality is lost regardless of how many times the file is saved. | Lossy. Some image data is permanently discarded at save time to reduce file size. Each re-save causes further quality loss. |
| Text and sharp edges | Excellent. PNG preserves sharp edges around text, icons, lines, and UI elements perfectly — no artefacts, no blurring. | Variable. JPG compression creates visible artefacts around sharp edges (text, icons, borders) — especially at higher compression levels. Not ideal for text-heavy images. |
| Photographs | Good quality but large file size. A full-color photo stored as PNG is significantly larger than the same photo as a JPG with minimal visible quality difference. | Excellent for photos. JPG compression is highly effective for photographic content, producing much smaller files with minimal perceptible quality loss. |
| Transparency support | Yes. PNG supports full alpha channel transparency. Areas with no background color are stored as transparent. Important consideration when converting to PDF (see transparency section below). | No. JPG does not support transparency. Any transparent area is rendered as white or with a background color when saved as JPG. |
| Typical file size | Larger than JPG for photographic content. Often smaller than JPG for screenshots and diagrams because flat color areas compress efficiently. | Smaller than PNG for photographs. Larger than PNG for screenshots and flat-color images at equivalent quality. |
| Best for converting to PDF | Screenshots, UI designs, mockups, diagrams, charts, infographics, scanned text documents, and any image where sharpness and edge accuracy are more important than file size. | Photographs, scanned photo documents, camera images, and any image where color variation is the main content and sharp edges are not a priority. |
Conversion settings — complete reference
The tool provides four groups of settings. Choosing the right combination for your content and intended use produces a significantly better result:
| Setting | Option | When to use it |
| Page Size | ||
| Page Size | Fit (same page size as image) | The PDF page is sized to match the exact pixel dimensions of the PNG image. No white space is added, and the image fills the entire page. Use this for screenshots, UI mockups, diagrams, and any PNG where the exact pixel dimensions should be preserved. Particularly useful when screen resolution or aspect ratio must not change. |
| Page Size | A4 (297 × 210 mm) | All images are placed on standard A4 pages, with the image scaled to fill the page area. Use for documents intended for printing or submission in Europe, Asia, Australia, and most countries outside North America. Also appropriate for formal business documents, academic submissions, and any context requiring a standard international paper size. |
| Page Size | US Letter (215.9 × 279.4 mm) | All images are placed on US Letter pages. Use for documents intended for printing or submission in the United States, Canada, or Mexico, or for any US-based institution, court, publisher, or employer that expects Letter-size documents. |
| Page Orientation | ||
| Orientation | Automatic | Detects each image's aspect ratio and selects portrait (taller than wide) or landscape (wider than tall) automatically. Recommended for mixed batches where some images are screenshots taken in landscape and others are portrait-format scans. Handles each image individually. |
| Orientation | Portrait | Forces all pages to portrait orientation. Images wider than tall will be scaled down to fit within portrait bounds. Use when all images are portrait-oriented or when a consistent portrait document layout is required by a submission system or style guide. |
| Orientation | Landscape | Forces all pages to landscape orientation. Use for wide-format content such as application screenshots, desktop UI captures, widescreen mockups, data visualization exports, and presentation slide images — all of which are naturally wider than tall. |
| Margin | ||
| Margin | No Margin | The image fills the entire page edge to edge. Best for screenshots and UI mockups where every pixel of the image is content and a white border would be distracting. Also appropriate for photos and design exports where the image is intended to fill the page completely. |
| Margin | Small Margin | A narrow white border (approximately 0.5 inch / 12 mm) surrounds the image. Use for documents that will be printed and reviewed in physical form — the margin provides a natural holding area and makes the document more comfortable to read. Also improves visual presentation for documents shared in professional contexts. |
| Margin | Big Margin | A wide white border (approximately 1 inch / 25 mm) surrounds the image. Use for formal documents, academic submissions, legal filings, or any context where standard document margins are expected. Also gives design exports and diagrams a clean, gallery-style presentation. |
| Merge into single PDF | ||
| Merge | Enabled (checked) | All uploaded PNG images are combined into one PDF file, one image per page, in the order you set. Download is a single file. Use this when all images belong to the same document: a multi-step tutorial, a bug report with sequential screenshots, a UI flow walkthrough, or a multi-page scanned form. |
| Merge | Disabled (unchecked) | Each PNG is converted to its own independent single-page PDF. You receive multiple separate PDF files. Use this when each image is an independent deliverable: individual screen exports, separate design pages, or standalone diagram files. |
Common use cases and recommended settings
| Scenario | Recommended settings | Notes |
| Bug report or QA test documentation | Page size: Fit or A4. Orientation: Landscape. Margin: Small. Merge: Enabled. | Screenshots of application errors, test failures, or UI issues naturally belong in one sequential PDF. Landscape matches the wide-format aspect ratio of most desktop UI screenshots. Small margin improves readability for the person reviewing the report. |
| UI/UX design handoff or client review | Page size: Fit. Orientation: Automatic. Margin: No Margin or Small. Merge: Enabled. | Fit preserves exact pixel dimensions of each design screen — important for developers and clients evaluating layout proportions. No Margin ensures the full design is visible without cropping. Merge creates a single walkthrough document of the user flow. |
| Tutorial or step-by-step guide | Page size: A4 or Fit. Orientation: Landscape. Margin: Small. Merge: Enabled. | Step-by-step screenshots logically belong in one document. Small margin makes each step readable when printed or viewed on screen. Number filenames (01-step.png, 02-step.png) before uploading to ensure correct sequence. |
| Chart or data visualization export | Page size: Fit or A4. Orientation: Landscape. Margin: Big. Merge: Disabled (if separate charts) or Enabled (if a report deck). | Big margin frames the chart cleanly on the page. Landscape matches most wide-format chart exports. Fit preserves the exact data visualization dimensions if precision matters for the recipient. |
| Multi-page scanned document (PNG format) | Page size: A4 or US Letter. Orientation: Portrait. Margin: Small. Merge: Enabled. | Standard page size and margins produce a professional-looking scanned document. Portrait matches standard document orientation. Merge is essential — scanned pages must be one file, not loose separate PDFs. |
| Diagram or technical drawing | Page size: Fit. Orientation: Automatic. Margin: Small or Big. Merge: Disabled (if separate diagrams) or Enabled (if a series). | Fit preserves the diagram's designed dimensions. A margin frames technical drawings professionally and avoids printing to the very edge of the page, where inkjet and laser printers often cannot print. |
PNG files are often larger than JPG files, especially for photographic content, because lossless compression is less space-efficient for color-varied images. A batch of high-resolution PNG screenshots or design exports can produce a large PDF file. If the resulting PDF is too large to email or upload, use the ToolsPiNG PDF Compressor on the output — PDF compression can reduce file size significantly by re-encoding embedded images without the lossless constraint of the original PNG files.
Usage limits
| Account type | Daily conversions | Max file size | Images per session |
| Guest | 25 per day | 10 MB per file | Up to 5 images |
| Registered | 100 per day | 40 MB per file | Up to 20 images |
Related tools
- JPG to PDF — convert JPEG photos and images to PDF. Use this if your source images are in JPG format rather than PNG.
- Image to PDF — convert PNG, JPG, GIF, BMP, TIFF, and other image formats to PDF in one tool.
- Merge PDF — combine the resulting PDF with other existing PDFs into one document.
- Organize PDF — reorder or rotate pages in the converted PDF after generation.
- PDF Compressor — reduce the file size of a large PDF produced from high-resolution PNG files.
- Watermark PDF — add a text or image watermark to the converted PDF before sharing.
Frequently asked questions
Why is PNG better than JPG for converting screenshots and diagrams to PDF?
PNG uses lossless compression, meaning every pixel is stored exactly as it appears in the source image. No data is discarded. JPG uses lossy compression, which permanently removes some image data to achieve smaller file sizes. For photographic content this loss is barely visible, but for screenshots, UI designs, and diagrams — which contain text, sharp lines, and flat color areas — JPG compression creates visible artefacts: blurry text edges, blocky patches, and loss of fine detail. PNG-converted PDFs preserve these elements perfectly, producing sharper, more readable output for this type of content.
What happens to transparent areas in a PNG when converted to PDF?
Transparent areas in a PNG image are rendered as white in the PDF output. PDF pages have a white background by default, and transparent pixels in the PNG reveal that background. For most screenshots, diagrams, and designs that have an effective white background this produces the correct result. If your PNG has a transparent background and you want a different color to appear in those areas, fill the transparent layer with the desired background color in an image editor (GIMP, Photoshop, Preview on macOS, or Paint on Windows) and save a new PNG before converting. This gives you full control over what appears in transparent areas.
Can I convert multiple PNG images into a single PDF?
Yes. Upload multiple PNG files, arrange them in the correct sequence (drag to reorder, or number filenames 01-, 02-, 03- before uploading), and enable the 'Merge all images in one PDF' option before clicking Convert. The tool produces a single PDF with each PNG on a separate page in the order you set. If you leave Merge disabled, each PNG is converted to its own independent single-page PDF.
Which page size should I choose — Fit, A4, or US Letter?
Use Fit if the PNG's exact pixel dimensions should be preserved in the PDF — ideal for screenshots and design mockups where layout proportions matter and a standard paper size would alter them. Use A4 if the PDF will be printed or submitted in Europe, Asia, Australia, or any country where A4 is the standard paper size. Use US Letter if the document will be printed or submitted in the United States, Canada, or Mexico, or sent to a US-based recipient, institution, or organization.
What orientation should I use for application screenshots?
For screenshots of desktop applications, web browsers, and most software UIs, use Landscape orientation — these images are typically wider than tall. If you select Automatic, the tool will detect the aspect ratio of each image and choose landscape for wide images and portrait for tall images automatically. For mobile app screenshots taken in portrait mode, Automatic or Portrait gives the correct result. For mixed batches of both portrait and landscape screenshots, Automatic handles each image correctly without manual intervention.
Why is my converted PDF file very large?
PNG files are larger than equivalent JPG files for photographic content because lossless compression is less efficient at compressing color-varied images. A batch of high-resolution PNG screenshots or design exports can produce a large PDF. The most practical solutions: (1) use the ToolsPiNG PDF Compressor on the output PDF — it can significantly reduce file size; (2) resize PNG images to a lower resolution before converting if print quality is not required — 150 DPI is sufficient for screen reading, 300 DPI for print; (3) export screenshots at a lower scale factor (1x instead of 2x Retina) if your source application allows it.
What is the difference between PNG to PDF and Image to PDF?
PNG to PDF accepts only PNG files and is optimized for that format. Image to PDF is a broader tool that accepts multiple image formats including PNG, JPG, GIF, BMP, and TIFF — useful when you have a mixed set of images in different formats that you want to combine into one PDF. If all your images are PNG, either tool works; PNG to PDF is the direct route. If your images are in different formats, use Image to PDF to handle them all in one session.
Is the PNG to PDF Converter free?
Yes. The converter is free within the daily usage limits shown above. Guest users can run 25 conversion sessions per day, upload up to 5 images per session (10 MB each), without creating an account. Registering a free ToolsPiNG account increases the daily limit to 100 sessions, the file size limit to 40 MB per image, and the per-session image count to 20.