Convert PNG to PDF Online — Lossless Quality
Transparency flattened to a clean white background for universal compatibility.
Drop up to 50 PNG files at once — no install, no sign-up required.
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How it works
- 1 · Drop your files
Drag & drop or choose PNG files. No account required—paid plans unlock bigger batches, higher limits, and priority queues.
- 2 · We convert securely
Processed on our dedicated servers. Encrypted in transit & at rest. Transparency flattened to white so your PDF looks correct in every reader.
- 3 · Download & auto-delete
Get clean PDFs ready for sharing or printing. Files delete automatically after 1 hour. Delete anytime after downloading with one click.
PNG (Portable Network Graphics) provides lossless compression with full alpha channel transparency, making it the go-to format for graphics, screenshots, and images requiring pixel-perfect fidelity. Created in 1996 as a patent-free GIF alternative, PNG uses DEFLATE compression and supports both indexed color (PNG-8) and truecolor with alpha (PNG-24/32). Files are 3-10× larger than equivalent JPEGs but preserve every pixel exactly.
Learn more: PNG on Wikipedia
PNG is universally supported and ideal for logos, UI elements, diagrams, and any content where transparency or lossless editing matters. For photographic content without transparency needs, JPEG typically offers better compression efficiency.
PDF (Portable Document Format) is Adobe's universal document standard, designed to present text, images, and layout consistently across any device or platform. First released in 1993 and later standardized as ISO 32000, PDF supports vector graphics, embedded fonts, forms, annotations, and encryption. It has become the de facto format for document exchange, digital publishing, and archival—billions of PDFs are created daily worldwide.
Learn more: PDF on Wikipedia
PDF excels at preserving document fidelity and works universally—every operating system and browser includes native PDF support. For long-term archival or regulatory compliance, PDF/A is the appropriate variant.
Frequently Asked Questions
Why convert PNG to PDF?
PDF is the best way to share or print PNG content without layout surprises:
- Screenshots & diagrams: Package UI captures, flowcharts, and whiteboard shots into a single PDF that opens everywhere
- Logos & graphics: Keep crisp edges while flattening transparency so brand assets render consistently
- Professional sharing: PDFs are universally supported—no special software or plugins required
- Archival & printing: Fixed layout ensures your colors and shapes survive email chains and print jobs
How do you handle PNG transparency?
We flatten alpha to a pure white background (#FFFFFF).
- Transparent pixels become white so every PDF reader renders identically
- Semi-transparent pixels blend against white to avoid gray or black halos
- Opaque pixels stay untouched for crisp edges and sharp text
White is the industry standard for documents and printing, ensuring your logos, stickers, and diagrams look clean on screen and paper.
Is conversion lossless?
Yes—pixel data stays lossless after flattening.
- Opaque PNGs embed directly with no recompression
- Transparent PNGs are flattened to white, then embedded without lossy steps
- No extra JPEG compression—sharp edges and text remain crisp
Only the transparency channel is removed (required for PDF compatibility); colors and detail remain intact.
What are the limits for this converter?
| Tier | Max File Size | Max Files/Batch | Parallel Processing |
|---|---|---|---|
| Guest/Free | 50 MB | 50 files | 3 at once |
| Pro | 1024 MB | 1000 files | 6 at once |
Note: File size limits are specific to this converter. Batch and parallel processing limits apply to all documents converters site-wide. See all converter limits →
How are credits calculated for this conversion?
Cost: 1 credit per 5 MB
How it works:
- Files up to 5 MB: 1 credit
- 6-10 MB: 2 credits
- 11-15 MB: 3 credits
- 16-20 MB: 4 credits
Example: A 5 MB image = 1 credit. A 95 MB image = 19 credits.
Why per-megabyte? Larger files require more resources (processing, bandwidth, storage).
What are my daily and monthly credit limits?
Credit allocations vary by account tier:
| Tier | Daily Limit | Monthly Limit |
|---|---|---|
| Guest | 100 credits/day | — |
| Free | 100 credits/day | — |
| Pro | — | 12,000 credits/month |
Daily credits (Guest & Free tiers) reset every day at midnight UTC. Monthly credits (Pro) reset on your billing cycle date.
Note: With 1 credit per 5 MB, a typical document costs 1 credit. Pro users can convert 12000 documents per month.
Answers at a Glance
Quick answers to common questions.
- Are my files secure?
- How long do you keep my files?
- What metadata do you keep?
- What happens after I drop a file?
- Why are conversions so fast?
- How do you measure performance?
- What are the exact limits for each plan?
- Can I process files in bulk?
- Why did my file fail to convert?
- Do you use my files to train AI?
What's New in PNG to PDF
Latest improvements to this converter
Initial release of PNG to PDF converter. Each PNG becomes a single-page PDF with transparency flattened to white.
Need to get more done? Pro starts from $5.
No subscription required.