Convert PNG images to PDF online for free. Use this exact converter when you need scans, screenshots, receipts, or photos packaged into a document that is easier to print, share, or submit.
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Checking files and selected output formats.
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A 1 MB PNG typically becomes 1 – 1.1 MB as PDF.
Quality: Lossless — the PNG is embedded inside the PDF without re-encoding.
Heads up: PDF doesn't support transparency, so transparent backgrounds in your PNG will be flattened (usually to white).
Best for: sharing graphics, screenshots, or logos via PDF-required channels.
Avoid when: the recipient prefers raw images.
Tip: PDFs flatten PNG transparency (typically to white). If transparency matters, share the PNG directly.
PNG → PDF is the workflow for uploading screenshots to systems that only accept PDFs — insurance claims, dispute resolution portals, HR compliance systems, legal discovery uploads. PNG preserves the sharp text of a screenshot better than JPG, and the PDF wrapper makes it acceptable to the receiving system. Combined into multi-page PDFs when submitting a series of screenshots as evidence.
PDF is the universal fixed-layout document format — it renders identically across viewers, preserves fonts and formatting, and is the accepted-by-default format for invoices, contracts, government uploads, academic submissions, and portfolio work. Convert to PDF when the receiving system explicitly wants PDF or when the layout must not shift.
A single PDF containing multiple images is far easier to send, print, or attach to a form than a loose folder of photos.
The tool accepts a single image or a batch. When you upload multiple files, they become sequential pages in the resulting PDF, in the order they were dropped. Reorder them before converting if page sequence matters.
A4 or US Letter are the safe defaults for anything you'll print or submit. Portrait works well for vertical phone photos; landscape suits horizontal scans, whiteboards, and camera shots. The image scales to fit the page while preserving its original aspect ratio — no cropping without your say.
The output PDF is ready in a few seconds. Every image is embedded at its full resolution — nothing downsampled without warning. Both the PNG files you uploaded and the PDF are permanently deleted from our servers within 30 minutes.
PDF is the only format that combines "opens on every device" with "keeps images in a fixed order" and "can be signed, marked up, and printed with predictable results." Sending someone a ZIP of JPGs is fine for downloads, but a single PDF is the format most people actually expect for anything document-shaped.
Six specific situations where turning images into a PDF is the job — not a nice-to-have.
Visa applications, insurance claims, tax filings, and university admissions almost always expect one PDF, not a folder of photos. Snapping each page with your phone and combining them into a single PDF in the correct order is the fastest way to meet the "please upload as a single file" requirement.
Accounts teams don't want 12 separate receipt photos attached to a form — they want one PDF with all 12 pages. Batch-converting your PNG receipts to a single PDF turns the whole report into one attachment, easier for both you and the person approving it.
Photographing every page of a notebook, textbook, or handwritten manuscript produces a stack of images that's painful to navigate. Combining them into a PDF gives you a proper multi-page reading experience with page numbers, search (once run through OCR), and easy scrolling.
Most e-signature tools (DocuSign, Adobe Sign, iFormat's own e-signer) work on PDFs, not loose images. Turning a photo of a contract into a PDF is a required step before you can drop a signature block on it and send it back.
Email clients get twitchy about attachments over 10-20 MB, and lots of separate files trigger spam filters more often than one clean PDF. Consolidating a stack of PNG images into one PDF makes the email deliverable and the recipient's life easier.
Printing loose images from a folder means fiddling with each one's page size, orientation, and margins. A PDF preserves all of that in advance — hit print, get exactly what you laid out, in the order you chose.
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | PNG | |
|---|---|---|
| Full name | Portable Network Graphics | Portable Document Format |
| Year introduced | 1996 | 1993 |
| Developer / standard body | PNG Development Group / W3C | Adobe |
| MIME type | image/png | application/pdf |
| File extension | .png | |
| Compression | Lossless (DEFLATE) | Built-in (FlateDecode, DCTDecode) |
| Color / data depth | 24-bit truecolor + 8-bit alpha | Vector + raster |
| Max dimensions / size | 2,147,483,647 × 2,147,483,647 px | 381 km × 381 km (15,000 × 15,000 inches) |
| Transparency | Yes | Yes |
| Animation | APNG extension only | No |
| Standard / specification | W3C / ISO/IEC 15948 | ISO 32000 |
| Best for | Logos, screenshots, graphics with transparency or sharp edges | Final-form documents, contracts, archives — looks identical everywhere |
PNG (Portable Network Graphics) is a lossless image format created in 1996 as a patent-free replacement for GIF. It uses DEFLATE lossless compression, meaning every pixel is preserved exactly as intended — no visual information is discarded during encoding. PNG was developed by the web community and standardized by the W3C and ISO, making it one of the most trusted and universally supported image formats available.
PNG is best suited for screenshots, graphics, logos, and any image that requires transparency. Its support for a full alpha channel allows smooth, semi-transparent edges that blend seamlessly with any background. The main trade-off is file size — PNG files are significantly larger than JPEG for photographic content because no visual data is discarded. PNG does not natively support animation; for animated sequences, APNG (Animated Portable Network Graphics) serves as its extension.
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