How to convert PNG to PDF without uploading it
Every "free" online PNG-to-PDF converter you've used uploads your screenshots to a company server, converts them there, and — in several documented cases — keeps a copy or a live download link for days. For personal screenshots, scans of IDs, and anything you wouldn't post publicly, that's an unnecessary risk. The safer approach is to convert the file where it already is: on your own device.
This tool does exactly that. When you drop a PNG here, your browser:
- Checks the file is really a PNG — by its magic bytes, not its name — and walks every PNG chunk, verifying lengths and checksums, so a truncated download is refused with a clear message instead of producing a PDF with a broken image. A PNG saved with the wrong extension still converts.
- Reads the image size and colour details from the PNG header — including whether it has transparency, is 16-bit, is interlaced, or is animated — so each file gets the right treatment and the right warning before you convert.
- Turns the PNG pixels into PDF pages with pdf-lib — decoded and re-encoded losslessly, transparency kept as a real alpha mask. Animated PNGs are the one exception: the browser decodes the first frame and converts it to JPEG. Your original file is never modified.
What makes this converter different
The pages that top the results for this search are mostly generic multi-format image converters that list PDF as one of many targets, or server-side converters (iLovePDF, Smallpdf, Adobe and Convertio all upload your files first). This page is the only dedicated PNG-to-PDF page we found that combines a batch of 20 files with a ZIP download, a choice of one combined PDF or one PDF per image, A4/Letter/A5 and fit-to-image page sizes, orientation and margins, reorder controls, transparency kept in the PDF, 16-bit and interlaced handling, first-frame honesty for animated PNGs, and a live network-request counter so you can verify the privacy claim yourself. It runs entirely in your browser — there is no server to upload to.
When is PNG-to-PDF the right choice?
Whenever the destination wants a document, not a picture: job portals and application forms that only accept PDFs, visa and government forms, university and school uploads, screenshots and scans emailed as one file, and anything that must print exactly as it looks. A PDF also keeps a set of PNGs in one file, in order, where a folder of images would arrive scattered. If the destination accepts images, keep the PNG — a PDF adds page overhead and no quality.
Honest limitations
No text layer
The PDF pages hold pictures, not text. The PDF is not searchable, and you cannot select or copy words from it. Run it through OCR afterwards if you need searchable text.
PNG quality note
PNG pixels are decoded and re-encoded losslessly — no quality loss for 8-bit PNGs. 16-bit PNGs become 8-bit (high byte kept) and animated PNGs become a JPEG of the first frame, which is lossy. The original PNG bytes are not embedded verbatim.
Transparency, with one exception
Alpha channels are kept in the PDF. The exception is animated PNGs, whose first frame is flattened onto the background colour you pick in the settings.
No password or encryption
This tool does not add a password or encrypt the PDF. If a form needs a protected PDF, add the password afterwards in a desktop PDF tool.
No merging with existing PDFs
Your PNGs become a new PDF; they cannot be merged into a PDF you already have. Use Merge PDF afterwards to combine the result with other PDFs.
Metadata is stripped
PNG text chunks (titles, descriptions, creation software) are dropped when the pixels are embedded. Only the picture is kept — which is also why a screenshot's hidden notes never leave your device.