PNG to PDF: Lossless, Browser-Based, Unlimited
Free PNG to PDF converter that runs entirely in your browser. Combine multiple PNG images into a single PDF, preserving transparency and lossless image quality. No upload, no signup, no daily task limits, no watermarks. Perfect for compiling screenshots, UI mockups, line-art logos, technical diagrams, and any image where pixel-perfect quality matters.
Drop your images here, or click to choose
JPG, PNG, WebP. Multiple files allowed. Drag to reorder. Nothing leaves your device.
🔒 PNGs are processed in your browser. Nothing is uploaded.
What this converter gives you
Lossless conversion
PNGs are embedded losslessly. Every pixel preserved. No quality drop, no re-encoding.
Transparency preserved
PNG alpha channel is kept. Transparent areas show the white PDF page background. Useful for logos and line art.
100% browser-based
Your PNGs never leave your device. Network developer tools verify zero uploads during conversion.
No file count or size limit
Combine 2 PNGs or 200. Unlike iLovePDF's 25-file cap, Gizmoop has no caps. Practical limit is your device's memory.
Fit-to-image option
Preserve exact PNG dimensions in the PDF without scaling or cropping. Best for screenshots and diagrams.
Reorder before converting
Drag-and-drop or arrow buttons to set the page order. Each PNG becomes one PDF page.
Who needs PNG to PDF?
Compiling screenshots for documentation
Combine annotated screenshots into a step-by-step PDF guide. Lossless PNG keeps text in screenshots crystal-clear.
Bug reports with multiple screen captures
Snap screenshots of the bug at each step, then combine into one PDF attached to the ticket.
UI mockups into client deliverable
Designers export mockups as PNG (preserving fine detail), then combine into a single PDF for client review.
Logo and diagram bundles
Line-art logos and technical diagrams stay crisp in PNG. Bundle multiple variations into one reference PDF.
Slide deck exports
Export each slide as PNG from your presentation tool, then combine into a PDF for sharing without revealing the editable source.
Receipts and invoices with crisp text
When you need text in receipt photos to stay readable at zoom level, PNG outperforms JPG. Combine all receipts in PNG into one PDF for accounting.
About converting PNG to PDF
PNG vs JPG: when to use which for PDF
PNG (Portable Network Graphics) is a lossless image format. It preserves every pixel exactly as captured or generated, and it supports transparency through an alpha channel. JPG (JPEG) is a lossy format optimized for photographs; it shrinks file sizes by removing visual detail that human eyes do not easily notice. Both can be embedded into PDFs, but they serve different use cases.
Use PNG to PDF when your input images contain sharp edges, text, line art, diagrams, screenshots, logos, or anything where blur or compression artifacts would hurt readability. Use JPG to PDF when your input is photographic content (vacation photos, food photography, scanned printed photos) where smaller file size matters more than pixel-perfect preservation.
The size trade-off is real: a typical PNG screenshot is 200-500 KB; the same content as JPG might be 50-150 KB. For a 50-image PDF, that adds up to a 7.5 MB PNG-based PDF vs a 2.5 MB JPG-based PDF. If file size is critical, consider whether JPG quality is acceptable for your content.
How transparency is handled
PNG supports per-pixel alpha (transparency). When you embed a transparent PNG into a PDF, the PDF format does support transparency in modern versions (PDF 1.4 and later), and pdf-lib preserves it. Transparent areas of your PNG show through to the page background, which in this tool is white by default.
Practical implication: a logo with transparent background remains transparent in the PDF. In a PDF viewer, the transparent areas appear white (matching the page). If you place the PDF over a colored background in a presentation or document, the transparency is still preserved and will work correctly. Most modern PDF viewers handle this correctly; older PDF readers (Acrobat 4.0 and earlier) may not.
How the conversion works internally
The tool uses pdf-lib's embedPng API, which embeds the PNG bytes directly into the PDF document. No re-encoding happens, no quality loss, no transparency loss. The PDF file references the embedded PNG by its raw byte data and renders it at the position and size specified by your page settings (size, orientation, margin).
Each PNG becomes one PDF page. The page size is determined by your "Page size" setting. With "Fit to image", the page is created exactly the size of the PNG plus any margins. With A4/Letter/Legal, the PNG is scaled to fit within the standard page minus margins, preserving aspect ratio.
Page size and margin guidance
Fit to image: Use when the PDF is for digital sharing only and you want zero scaling. Screenshots, UI mockups, and diagrams typically use this to preserve their native dimensions exactly. The output PDF page dimensions exactly match the PNG plus your chosen margin.
A4 / US Letter / Legal: Use when the PDF will be printed or shared as a formal document. Each PNG is scaled to fit within the standard page minus margins. Aspect ratio is preserved, so portrait images get vertical white space, landscape images get horizontal white space.
Margin options: None (PNG fills the entire page), Small (6 mm, prevents edge cutoff during printing), Medium (12 mm, standard office printing), Large (25 mm, formal documents and bound reports).
Real-world workflows
Documentation team: Take screenshots throughout a feature, annotate with arrows and labels using a tool like Snagit or built-in OS markup, save each as PNG with transparency, combine into a single tutorial PDF using this tool.
QA team filing bug reports: Capture sequence of screenshots showing the bug, combine into a single PDF attached to the ticket. PNG preserves text readability in UIs at any zoom level.
UX designer: Export multiple mockup variations from Figma/Sketch as PNG (which preserves vector-source crispness when rendered to raster), combine into a PDF for client review.
Technical writer: Generate diagrams in draw.io or Lucidchart, export as PNG (for compatibility), bundle into a single reference PDF for engineering team distribution.
Privacy guarantees
The PNG-to-PDF conversion uses pdf-lib JavaScript library running entirely in your browser. No HTTP requests carry your PNG data. No analytics record what images you process. We have no account system, so no profile is associated with your activity. The strongest privacy guarantee any free PNG-to-PDF tool can offer.
For comparison: iLovePDF's privacy policy states files are deleted within 2 hours. SmallPDF deletes within 1 hour. Adobe Acrobat Online requires an account. None of these match the "no upload at all" guarantee Gizmoop provides. If your PNGs contain proprietary designs, confidential UI mockups, internal documentation, or anything you would not email to a stranger, the no-upload model matters.
Combining with other Gizmoop tools
Common chains: SVG to PNG (rasterize vector exports) → PNG to PDF (combine into one deliverable). Image Resizer (downsize huge PNGs) → PNG to PDF (smaller final PDF). PNG to PDF → Watermark PDF (add brand watermark) → Compress PDF (reduce for email). Add Page Numbers PDF (annotate the result). Every step is browser-based with no upload.
Browser support and performance
Works in Chrome 88+, Firefox 89+, Safari 15+, Edge 88+. Internet Explorer is not supported. Mobile browsers handle modest batches (5-20 PNGs) smoothly; very large batches benefit from desktop hardware. The conversion is CPU-bound: each PNG embeds in a few milliseconds, so a batch of 50 takes a couple of seconds on a modern desktop and 10-20 seconds on a phone.
Limits to know about
Very high-resolution PNGs (above 16 MP per image) may exceed browser memory limits when many are batched together. If you need to combine 50 high-resolution PNGs, your phone may not have enough RAM; use a laptop instead. If a phone batch fails, try smaller batches and merge the resulting PDFs with our Merge PDF tool.
The tool does not OCR (extract text from) embedded PNGs. The output PDF will contain images of text but not searchable text. For searchable PDFs from screenshots, you need an OCR step (Adobe Acrobat Pro and Foxit PhantomPDF both offer it; we may add it in a future phase).
Frequently asked questions
If you don't find your question here, ask us directly.
Drop your PNG images into the tool above, pick a page size and orientation, and click Convert. The PDF generates in your browser and downloads instantly. PNG transparency is preserved over a white page background. Drop multiple PNGs to combine them into a single multi-page PDF, with each image as one page.
PNG transparency is embedded into the PDF, but PDFs themselves do not natively support transparency the same way PNGs do. When a transparent PNG is placed on a PDF page, the transparent areas show the white page background by default. For visible transparency, use the PDF in a viewer that supports it (most modern viewers do).
No, never. The conversion uses pdf-lib running in your browser. Network developer tools verify zero uploads. This matters for privacy-sensitive images like ID scans, medical screenshots, or proprietary diagrams.
PNG is lossless and preserves transparency, which makes it ideal for screenshots, logos, line art, diagrams, and any image with sharp edges or text. JPG is better for photos because it compresses smaller. Use PNG when quality must be perfect or when transparency matters.
A4 for international document sharing (210x297 mm). US Letter for North American documents (8.5x11 in). "Fit to image" preserves the original PNG dimensions exactly without any page-size scaling. Pick fit-to-image for diagrams and screenshots; pick A4/Letter for printable documents.
Yes, this is the most common PNG to PDF use case. Drop your screenshots in the order you want them, optionally drag to reorder, and convert. Useful for bug reports, tutorials, slide compilations, and documenting step-by-step processes.
No hard limit imposed by the tool. Practical browser memory handles individual PNGs up to about 50 MB and combined batches up to about 500 MB on a desktop. Large PNGs (4K screenshots from high-resolution displays) work fine but slow the conversion proportionally.
No. PNG images are embedded losslessly via pdf-lib's embedPng API. The pixels in the PDF exactly match the pixels in the source PNG. The PDF file size is roughly the sum of PNG sizes plus minor overhead.
No, because PNG files contain no text data. The PDF will look like the images but text cannot be searched or selected. For searchable text, the PNG images must first be processed through OCR (optical character recognition) to extract text.
Yes. Use our Add Page Numbers PDF tool to number every page, and Watermark PDF to overlay text or images. Both work browser-side on the converted PDF, keeping the same privacy-first workflow.
Both upload your PNGs to their servers (deleted within 1-2 hours). Both have daily task limits on free tiers. Gizmoop processes everything in your browser with no limits, no signup, no watermarks. Perfect for sensitive screenshots and proprietary diagrams.
Yes, on any modern mobile browser. Touch-friendly drag-drop. Mobile RAM is more constrained, so very large batches may slow down; for big PNG collections use a laptop or desktop.
Compiling screenshots for documentation, bug reports, or tutorial guides. Combining UI mockups into a client-facing PDF deliverable. Bundling line-art logos or diagrams into a reference document. Anything where lossless image quality and transparency matter.
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