How do I convert multiple PNG files to a single PDF?

Upload multiple PNG files in the tool, arrange them in the desired order, choose page size and orientation if needed, then convert. The result is one PDF with one image per page in the order you selected.

Does this tool preserve PNG transparency in the PDF?

Yes. The tool preserves transparency natively by embedding the PNG stream into the PDF, extracting the alpha channel into a /SMask (Soft Mask) dictionary so it does not render with an ugly white or black background.

Are my PNG files uploaded to a server?

No. This tool converts PNG to PDF directly in your browser using client-side PDF generation. Your images are never uploaded to our servers, ensuring 100% privacy even for passport scans.

Can I convert 50 or more PNG images at once?

Yes, you can batch combine 50 or more PNGs since everything is processed locally on your device without server-side file limits or queued processing delays.

Why does my PNG look blurry in the PDF?

Blurriness can occur if you stretch a small image across a large page size (like A4), forcing re-compression. To maintain 300 DPI full resolution without stretching, use the Fit to Image setting.

Can I use this on mobile or iPhone?

Yes. The converter works perfectly on iOS, Android, and tablets. You can select multiple PNGs directly from your photo library and generate the PDF right on your phone.

What is the difference between PNG to PDF and JPG to PDF?

PNG to PDF supports lossless quality, transparency (alpha channel), and DeviceRGB color space. JPG to PDF uses lossy compression and does not support transparency, making it better for photos but worse for text and logos.

PNG to PDF Converter

Direct Answer & Definition

Convert PNG images to PDF online for free without uploading files to any server. Our browser-based PNG to PDF converter supports batch conversion of unlimited images, preserves RGBA transparent backgrounds natively, and lets you configure page size (A4, Letter, Custom), orientation, margins, and image alignment. Process design assets, screenshots, and transparent logos privately on your device — zero tracking, no signup, no file limit.

Convert PNG images to PDF online — free, unlimited, 100% private. Preserve RGBA transparency, batch combine 50+ PNGs, choose A4/Letter/custom page size, orientation & margins. Zero server uploads. No signup, no watermark, no file limit.

Instant

Private

Free

Last Updated: July 2026|Reviewed by: ToolifyHub.tools Editorial Team|100% Browser-Based Security

Useful Next Step:PDF Compressor|JPG to PDF|Image Compressor|PDF to PNG

Drop PNG images here

or Choose PNG files from your device

Supports PNG • Up to 100 MB per file • Multiple files allowed

Private by Design • Images never leave your browser

What is PNG to PDF conversion?

PNG to PDF is a raster-to-vector-container workflow. It takes PNG images (which use the DeviceRGB color space) and embeds them inside a PDF document structure. This is highly useful for batch archiving, creating presentation slides from design mockups, and preserving the alpha channel natively. By packing PNGs into a PDF, you turn loose image files into a paginated, shareable document that anyone can open in standard readers.

How to convert PNG to PDF

Select

Select or drag PNG files into the browser. You can select multiple images.

Arrange

Arrange images in desired page order via drag-and-drop thumbnails.

Configure

Set page size, orientation, margins, and transparency settings.

Download

Click Convert and instantly download your merged PDF locally.

PNG Transparency Preservation Guide

PNG is unique because it supports a 4-channel format: Red, Green, Blue, Alpha (RGBA). The alpha channel defines pixel opacity from 0 to 255. Most basic converters fail to process this correctly, flattening the alpha channel onto a stark white or black background, ruining your image design.

ToolifyHub's advanced approach extracts the alpha channel into a /SMask (Soft Mask) dictionary inside the PDF, natively preserving transparency and preventing harsh black halo artifacts. This is perfect for logo design files, UI screenshots with rounded corners, and architectural diagrams with transparent overlays.

Pro Tip: If your target PDF viewer (like some older versions of Adobe Reader) shows a white box behind transparent areas, this is purely a viewer rendering preference issue. The embedded PDF data is transparent. Note that PNG is DeviceRGB; if your PDF is meant for print, ensure your workflow accounts for ICC profile embedding for CMYK.

Page Size & DPI Guide

A4

595×842 pts, 210×297mm. Standard document size for Europe and academics.

Letter

612×792 pts, 8.5×11in. Standard document size for US and business.

Fit to Image

Page size equals exact image pixel dimensions at DPI. Best for screenshots and keeping full resolution without distorted aspect ratios.

Custom

Specify exact width × height in mm. Used for custom print dimensions.

Formulas: PDF points = mm × (72 / 25.4). Page size from image = (Width in pixels / DPI) × 72.

Competitor Comparison Table

Platform	Max Free Files	Privacy	Transparency Support	Cost
ToolifyHub	Unlimited	100% Browser-side, Zero uploads	Full RGBA /SMask	Free Forever
iLovePDF	Max 15MB file	Server upload, 600+ cookies	White background (re-encodes)	$4/mo Pro
Smallpdf	2 tasks/day, 50MB max	AWS Cloud upload	White background	$9/mo for batch
Adobe Acrobat	1-2 conversions	Adobe Cloud upload	Basic	$19.99/mo
PDF24	Unlimited	Server upload + heavy ads	No alpha support	Free (ad-supported)
Sejda	3 tasks/hour, 30 images	Server upload	No alpha support	$7.50/mo

Privacy Section

This tool converts PNG to PDF directly in your browser. Files are absolutely not uploaded to our servers, keeping your sensitive design assets, passport scans, and client materials secure. By using modern client-side processing, we guarantee zero server upload and complete privacy—you do not have to worry about unknown 3rd-party servers retaining copies of your files.

Common PNG to PDF Problems & Solutions

Alpha channel ruined (harsh black box)

Because standard tools flatten the alpha channel. We extract it into a Soft Mask, natively preserving your transparency without black halos.

Forced re-compression & blurriness

Happens when sharp 300 DPI infographics are downscaled. Use "Fit to Exact Image Dimensions" to avoid losing quality or stretching.

Privacy fear when converting passport scans

Terrified of unknown servers? Our client-side approach ensures zero server uploads—your ID scans never leave your device.

Distorted aspect ratios

Images get stretched to fit A4 without maintaining ratio on other tools. We maintain aspect ratios perfectly or use "Fit to Image".

Related Tools & Workflows

Convert PDF pages to PNG images, Convert JPG images to PDF, Resize images before converting to PDF, Combine multiple PDFs into one