Convert PDF to PNG online, free
Most converters that write PNG quietly reduce it to a colour palette first, because that is how you shrink a PNG — and for a photograph, a few hundred colours is invisible. A rendered PDF page usually is not a photograph, though. It is text, tables, line art, a scanned signature: exactly the content where palette reduction shows up as banding and fuzzed edges instead of vanishing unnoticed. So this tool's PNG output is fully lossless by default. Every pixel the engine renders is the pixel you get back.
A deliberate difference from this site's photo converter
On the Convert Images tool, PNG output is quantised by default, because there the source is usually a photograph and the saving is free. Here it is off unless you ask for it. A document page and a photograph shrink differently, and the default reflects that instead of applying one rule to both. It costs you a larger file than the same page as JPG or WebP, and that is the trade being made on purpose.
The size trade-off, measured
On a measured 100-page batch at 150 DPI, lossless PNG output ran about 158 MB and took roughly 25 seconds. Switching on Reduce colours cut that to about 53 MB — at close to five times the processing time, since it runs a real compression pass over every page rather than just writing pixels. Leave it off for archiving, signatures, or anything that needs to stay exact. Turn it on when you specifically want smaller PNGs and can spend the extra time. The palette size is yours to set, anywhere from 2 to 256 colours.
Resolution
Pages render at 150 DPI by default, which puts a standard A4 or US Letter page at roughly 1250×1600 pixels. Set it anywhere from 72 to 400 — up for archival scans and print, down for a faster job on a long document. The three compression presets control how hard the PNG encoder works, not how much detail survives.
Rotated pages and mixed page sizes
Each page's rotation and dimensions are read from the PDF itself, not assumed uniform across the document. A scanned file with sideways pages, or one mixing portrait and landscape sheets, renders every page upright at its own correct shape rather than forced to match the first page.
Batches and protected files
Up to 20 PDFs per request, from your device, Google Drive, or a direct link. Each file carries its own optional password, so protected and unprotected documents convert together. Results arrive as one ZIP with a folder per source document, deleted from the servers within an hour.
What you get
- Fully lossless PNG output by default — no silent palette reduction
- Optional colour reduction with a palette you control, from 2 to 256
- Resolution from 72 to 400 DPI, 150 by default
- Correct handling of rotated pages and mixed page sizes
- Up to 20 PDFs per batch, each with its own password
- No account, no watermark, and files deleted within an hour
What's next?
Need smaller files and maximum compatibility? Convert PDF to JPG ran about 26 MB on the same batch this one produced at 158 MB. Putting the pages on a website? Convert PDF to WebP offers lossless too, at a smaller file than PNG. And to shrink the PNGs afterwards, Compress PNG works without changing format.