Transparency is kept in the PDF
A transparent PNG does not get a black or white box. In our test the PDF stored the picture with a separate transparency mask, and the transparency values matched the PNG exactly.
PNG to PDF Converter
Add a PNG and get a PDF with the image on one page. In our test a transparent logo stayed transparent.
To convert png to pdf, add the PNG file, keep PDF as the output format and download the result. You get one PDF with one page for the image. In our test a transparent 800 × 600 px logo became a PDF with the transparency intact, and the page was the size of the image rather than A4 or Letter.
Transfers use HTTPS, and files converted on the free tier are deleted after 24 hours, so the result is not a long-term archive. Quality depends on the source file, so open the PDF file once before you share it.
Need more PDF options? Open the PDF Converter hub.
FromPNGLosslessTransparency
PNG (Portable Network Graphics)
A lossless raster format with a full alpha channel. It preserves every pixel it is given and supports transparency, which makes it the usual choice for logos, screenshots, and any image with sharp edges or text.
ToPDFLossless
PDF (Portable Document Format)
A fixed-layout document format published as ISO 32000. Each page records the exact position of every character, image and line, usually with the fonts embedded, so it displays and prints identically in any reader and is awkward to edit.
Two PNG samples we made: an 800 × 600 px transparent logo and a 1600 × 1000 px screenshot, converted on indox.org
- PNGtransparent logo, 800 × 600 px, the original
- 25.8 KB
- PDFfrom indox, about 6% larger, transparency kept, 1 page
- 27.5 KB
- PNGopaque screenshot, 1600 × 1000 px, the original
- 234.6 KB
- PDFfrom indox, 23.8% smaller, 1 page
- 178.8 KB
Why use indox to convert PNG to PDF?
The image is stored without JPEG compression
The picture inside the PDF was not re-saved as JPEG in our test, so screenshots and text keep their sharp edges. The PDF holds the same pixels, so zooming in looks like zooming into the PNG.
Nothing to install
The conversion runs on indox servers in your browser page. You do not need a PDF printer driver, an image editor or a desktop app.
What happens to your PNG
Stays
- Your original PNG, which is not touched
- The pixels, stored without JPEG compression in our test
- The transparency, kept as a soft mask that matched the PNG
- The picture, as the single page of the PDF
Changes
- Page: sized from the image, 192 × 144 pt for 800 × 600 px in our test
- File size: 25.8 KB became 27.5 KB for a logo, 234.6 KB became 178.8 KB for a screenshot
- Format: a document page instead of a standalone image file
- Text: still pixels, not selectable
How do I convert PNG to PDF online?
- 1
Add your PNG file
Drop the PNG on the box or choose it from your device. Keep the PNG: it is your original and the PDF is a copy made from it.
- 2
Confirm PDF, then start the conversion
Check that PDF is the output format, then start the conversion. In our test it took 3.8 seconds from the click to Completed for a transparent logo and 3.3 seconds for a screenshot.
- 3
Download the PDF and open it once
Save the PDF and look at it before you send or upload it. Check the page size and, for a transparent image, how it looks on the background you will use.
What do I get from indox's PNG to PDF converter?
You hand over a PNG and take away a PDF that shows the same image on one page. The page says up front what it does with transparency and page size, so you know before you convert whether the result fits the form, email or print job.
- One PDF for the PNG you add, in a few clicks
- Transparency and pixels shown with numbers from a real run
- Page size and the one-file-per-PDF limit stated before you start
- Your original PNG is left as it was
What are the limits for PNG to PDF?
Size
The upload box shows the live size limit before you add a file. Signing in raises it; a paid plan does not change it.
Formats
PNG in, PDF out. Pick another output on the converter if you need a different format.
Privacy
Files are encrypted in transit over HTTPS and processed on indox infrastructure.
Deletion
Free-tier files are kept for 24 hours after the job finishes, then deleted automatically.
Limits worth knowing
- One PNG makes one PDF. The converter takes a single file per job, so you cannot put several images on separate pages of one PDF here. Convert each PNG, then join the PDFs with Merge PDF.
- There are no page options. We saw no choice of A4, Letter, orientation or margins, and the page always follows the image size.
- The result is a picture, not text. There is no text recognition, so the words in a screenshot cannot be selected or searched. Run OCR on the PDF if you need that.
- Transparent areas show the viewer's background. The PDF keeps the transparency, so a viewer may draw white, grey or a pattern behind it, and a printer prints paper white. We checked one renderer, not every viewer.
- We tested static PNG files only. Animated PNG and PDF/A output were not tested, and the result is a plain PDF.
When the result is not what you expected
| What you see | Why | What to do |
|---|---|---|
| The page is tiny or odd-shaped | The page follows the image pixels at 300 per inch, with no A4 fit | Scale the PDF when you print, or place it on a larger page in a PDF editor |
| The logo looks white or grey, not clear | The PDF keeps the transparency and your viewer draws a background behind it | Place the PDF over the colour you want, or open it in another viewer to compare |
| I need several images in one PDF | One file is converted per job | Convert each PNG, then join them with Merge PDF |
| The words cannot be selected | The PDF holds a picture, not text | Run OCR PDF on the result |
| I wanted a PNG back from the PDF | This page goes one way, PNG to PDF | Use PDF to PNG for the other direction |
What do the free and paid plans add?
Free
- All converters
- Daily credit refresh
- Email support
Basic
- Access to all features
- AI Extract
- Priority conversions
- Email support
Highest priority
Premium
- Everything in Basic
- Highest priority queue
- Priority support
Pay-As-You-Go
- No subscription
- Credits never expire
- Opt-in auto-refill
- Access to all features
Which conversions are close to PNG to PDF?
PNG vs PDF: what is the difference?
| Compared on | PNG | |
|---|---|---|
| What it is | One raster image | A document of fixed pages that can hold images, text and vector shapes |
| Compression | Lossless, every pixel is kept | Depends on how the image was stored; in our test the PNG's pixels went in without JPEG |
| Transparency | Alpha channel in the file | Possible through a soft mask; the viewer draws the background |
| Page size | None, only pixels | Fixed in points, so it prints at a set size |
| Typical use | Logos, screenshots, web graphics | Forms, reports and files meant to be printed or sent as documents |
Who can use a PNG to PDF converter?
When to use it
- Turning a screenshot of an error or a receipt into a PDF for a support ticket or an expense claim.
- Putting a transparent logo into a PDF that will be placed on a coloured page.
- Uploading a PNG scan of a form to a portal that accepts PDF only.
- Making a PDF copy of a PNG diagram to attach to an email or a document.
Where can I read more about converting files?
Sources
- PNG (Portable Network Graphics) Specification, Third EditionW3C
- PDF (Portable Document Format) familyLibrary of Congress
Facts checked on November 4, 2026
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PNG to PDF FAQs
How do I convert PNG to PDF?
Open the converter, add your PNG file, keep PDF as the output and download the result. You get one PDF with the image on one page, and you do not need to install anything.
Is it free to convert PNG to PDF?
In our test on 4 November 2026 we converted anonymously, with no sign-in, and saw no limit, paywall or error. Limits can change, so the page you see is the one to trust.
What happens to the transparent background of my PNG?
It stays transparent. In our test the PDF held the image plus a separate transparency mask, and the transparency values matched the PNG exactly. The viewer draws what is behind it: white on white and dark grey on dark grey in the renderer we used.
Does converting PNG to PDF lose quality?
In our test the image inside the PDF was not JPEG-compressed, so detail and sharp edges were kept. We checked the transparent sample pixel by pixel on its transparency values and, for the opaque screenshot, only the storage type and size.
What page size does the PDF have?
The page follows the image. In our test an 800 × 600 px PNG gave a 192 × 144 pt page (2.67 × 2.0 in) and a 1600 × 1000 px PNG gave 384 × 240 pt, both at 300 pixels per inch. There was no A4 or Letter fit.
Can I put several PNG files into one PDF?
Not in one step here. The converter takes one file per job and makes one single-page PDF. Convert each PNG and join the PDFs with the Merge PDF tool. We did not test a multi-file upload.
Will the PDF be smaller than the PNG?
It depends on the image. In our test a transparent logo grew by about 6%, from 25.8 KB to 27.5 KB, while an opaque screenshot shrank by 23.8%, from 234.6 KB to 178.8 KB. Do not count on a size saving.
Can I select or search the text in a screenshot after converting?
No. The PDF holds the screenshot as a picture, so the words are pixels. Run [OCR PDF](/pdf-tools/ocr-pdf) on the result if you need selectable text.
Can I convert a PNG to PDF on a phone or a Mac?
The converter is a web page, so there is nothing to install on any device with a modern browser. We ran our test on one setup and did not test phone browsers separately.