How to Convert PNG to PDF (Free, No Upload Needed)

You have a PNG — a screenshot, a scanned document, a signed form — and you need it as a PDF. Maybe your professor wants homework submitted as PDF. Maybe your client needs a document in a format that prints reliably on every machine. Maybe you are assembling a portfolio and need multiple images in one file.

PNG to PDF conversion is straightforward, and you do not need to install anything. Here is how.

Convert PNG to PDF in Your Browser

Pixotter's Image to PDF tool converts PNG files to PDF entirely in your browser. Your files never leave your device.

1. Open pixotter.com/image-to-pdf/.
2. Drop your PNG file(s) onto the page.
3. If converting multiple PNGs, arrange them in the order you want them to appear in the PDF.
4. Click Convert and download your PDF.

Each PNG becomes a page in the PDF, sized to fit the image dimensions. The conversion is instant — no upload, no server processing, no file size limits imposed by a remote API.

Why client-side conversion matters: Most online PNG-to-PDF converters upload your files to a remote server, convert them, and send the PDF back. That means your documents — which might contain sensitive information like signed forms, medical records, or financial statements — pass through someone else's infrastructure. Pixotter processes everything locally. Nothing leaves your computer.

How to Convert PNG to PDF on Windows

Method 1: Pixotter (Browser, No Install)

Open pixotter.com/image-to-pdf/ in any browser. Drop PNGs, download PDF. Works on Windows 10, 11, and any version with a modern browser.

Method 2: Microsoft Print to PDF (Built-in)

Windows 10 and 11 include a virtual PDF printer:

1. Right-click the PNG file → Open with → Photos (or any image viewer).
2. Press Ctrl+P to open the print dialog.
3. Select Microsoft Print to PDF as the printer.
4. Click Print and choose where to save the PDF.

For multiple PNGs in one PDF: Select all PNG files in File Explorer, right-click → Print. Windows opens the Print Pictures wizard with all images queued. Choose Microsoft Print to PDF and select your layout (full page, 2 per page, etc.).

Method 3: PowerShell + ImageMagick

# Requires ImageMagick 7.1.1-29+
# Install: winget install ImageMagick.ImageMagick

# Single PNG to PDF
magick input.png output.pdf

# Multiple PNGs to a single multi-page PDF
magick *.png combined.pdf

# With specific order
magick page1.png page2.png page3.png document.pdf

How to Convert PNG to PDF on Mac

Method 1: Pixotter (Browser)

Same process — pixotter.com/image-to-pdf/ in Safari, Chrome, or Firefox.

Method 2: Preview (Built-in)

macOS Preview can export PNG files as PDF:

1. Open the PNG in Preview.
2. File → Export as PDF.
3. Choose a filename and save.

For multiple PNGs in one PDF:

1. Open the first PNG in Preview.
2. View → Thumbnails to show the sidebar.
3. Drag additional PNGs into the sidebar in the desired order.
4. File → Export as PDF — all pages export to a single PDF.

Method 3: Terminal

# Using sips + cupsfilter (built-in, no install)
sips -s format pdf input.png --out output.pdf

# Using ImageMagick (install via: brew install imagemagick)
magick input.png output.pdf
magick page1.png page2.png page3.png combined.pdf

How to Convert PNG to PDF on Linux

Method 1: Pixotter (Browser)

Open pixotter.com/image-to-pdf/ in any browser. Works identically on Linux.

Method 2: ImageMagick

# Install ImageMagick 7.1.1-29+ (Ubuntu/Debian)
sudo apt install imagemagick

# Single file
magick input.png output.pdf

# Multiple files into one PDF (in alphabetical order)
magick *.png combined.pdf

# With quality/DPI control
magick input.png -density 300 -quality 95 output.pdf

Note: ImageMagick's default security policy on some Linux distributions blocks PDF operations. If you get a "not authorized" error:

# Edit the policy file
sudo nano /etc/ImageMagick-7/policy.xml

# Find the line: <policy domain="coder" rights="none" pattern="PDF" />
# Change to: <policy domain="coder" rights="read|write" pattern="PDF" />

Method 3: img2pdf (Python)

# Install
pip install img2pdf  # img2pdf 0.5.1 (LGPL-3.0)

# Convert (lossless — embeds the PNG directly, no re-encoding)
img2pdf input.png -o output.pdf

# Multiple files
img2pdf page1.png page2.png page3.png -o combined.pdf

# With page size
img2pdf --pagesize A4 *.png -o document.pdf

img2pdf is notable because it embeds the PNG image data directly into the PDF without re-encoding. This means zero quality loss and fast conversion. Other tools (like ImageMagick) may re-encode the image, which can alter quality.

Combining Multiple PNGs Into One PDF

This is the most common use case — assembling multiple images into a single document. Here is a comparison of methods:

Best method for lossless multi-page PDF: img2pdf (Python) or Pixotter. Both embed the image data directly without re-encoding.

Best method for controlled page sizing: ImageMagick with -density and -page flags, or img2pdf with --pagesize.

PNG to PDF Settings

DPI and Print Quality

The DPI (dots per inch) setting determines how large the image appears when printed:

Rule of thumb: 300 DPI is standard for printed documents. If the PDF will only be viewed on screen, 72-150 DPI is sufficient and produces a smaller file.

To set DPI in ImageMagick:

magick input.png -density 300 output.pdf

Page Size

Most conversion tools auto-size the PDF page to match the image dimensions. If you need a standard page size (A4, Letter), the image is either scaled to fit or placed on the page with margins.

# img2pdf: fit image to A4 page
img2pdf --pagesize A4 input.png -o output.pdf

# ImageMagick: resize to fit A4 (210mm × 297mm at 300 DPI = 2480 × 3508 px)
magick input.png -resize 2480x3508 -gravity center -extent 2480x3508 -density 300 output.pdf

Use Cases

Scanned Documents

Scanned forms, receipts, and documents are often saved as PNG. Converting to PDF makes them easy to share, print, and archive. For multi-page scans, combine all PNGs into a single PDF for a clean document.

Homework and Assignments

Students photographing or screenshotting handwritten work can convert the PNGs to PDF for submission. Use Pixotter's compression tool first if the PNG is large — a compressed PNG produces a smaller PDF.

Portfolios and Presentations

Designers and photographers can assemble PNG exports into a single multi-page PDF portfolio. Each image becomes one page.

Forms and Signatures

After signing a form digitally (screenshot or digital annotation), export as PNG and convert to PDF for submission. The PDF preserves the layout exactly as rendered.

Tips for Better PNG-to-PDF Results

Compress PNGs before converting. Large PNGs produce large PDFs. Run them through Pixotter's compression tool first — lossless PNG optimization can reduce file size by 20-50% without any visible change. Smaller PNGs mean smaller PDFs.

Use consistent dimensions. When combining multiple PNGs into one PDF, images of different sizes create pages of different sizes. Resize all PNGs to the same dimensions first using Pixotter's resize tool for a uniform document.

Crop unnecessary whitespace. Screenshots often include browser chrome, taskbars, or empty margins. Crop the image to just the content area before converting — this produces a cleaner PDF and a smaller file.

Choose the right DPI for your purpose. If the PDF is for email or screen viewing, 150 DPI is plenty. If it is for printing, use 300 DPI. Higher DPI means larger file size. For more on DPI settings, see How to Check Image DPI and How to Change DPI.

Frequently Asked Questions

Does converting PNG to PDF reduce quality?

Not if you use a tool that embeds the image directly (Pixotter, img2pdf). These tools place the PNG data inside the PDF container without re-encoding. Tools that re-render the image (like Print to PDF) may introduce subtle quality changes, especially at non-native resolutions.

Can I convert multiple PNGs to a single PDF?

Yes. Pixotter, ImageMagick, and img2pdf all support combining multiple PNGs into one multi-page PDF. Each PNG becomes one page. On macOS, Preview can also merge multiple images into a single PDF via its sidebar.

What is the maximum PNG size I can convert to PDF?

With Pixotter (browser-based), the limit is your device's available memory — typically hundreds of megabytes. With command-line tools like ImageMagick, there is no practical limit. Online services that upload files usually cap at 10-50 MB per file.

How do I convert PDF back to PNG?

Use ImageMagick: magick input.pdf output.png (creates one PNG per page, as output-0.png, output-1.png, etc.). Adjust resolution with -density 300 for high-quality output.

Can I add text to the PDF after converting from PNG?

The resulting PDF contains the PNG as an image — it is not searchable or editable text. To add text overlays, use a PDF editor (like Adobe Acrobat, PDF-XChange, or the free LibreOffice Draw). If you need the PNG content to be searchable, you would need OCR (optical character recognition) software, which is outside the scope of image format conversion.

Is PNG or JPG better for PDF conversion?

PNG is better when the content has text, sharp edges, or flat colors (screenshots, forms, diagrams) because PNG preserves these exactly. JPG is better for photographs because the files are smaller. Both convert to PDF identically — the format choice affects the source image quality, not the conversion process. See JPG vs PNG for a detailed comparison.

How do I reduce the file size of a PNG-to-PDF conversion?

Three approaches: (1) compress the PNG before converting — use Pixotter's compressor for lossless size reduction. (2) Reduce the DPI setting if the PDF is for screen viewing. (3) Convert the PNG to JPG first if some quality loss is acceptable — JPG photos are much smaller than PNG photos, producing a smaller PDF. See What is PNG? for more on PNG file sizes.