Convert PNG to JPG — Offline
Drop one or more PNG images onto MiniMax Converter and save them as JPG. Pick the quality (90 keeps it crisp, lower shrinks the file), and any transparency is flattened onto white. Runs locally — no upload, no file-size limit, no watermark.
How to convert
- Drag one or more PNG files, or a whole folder, onto the MiniMax Converter window.
- Choose JPG as the output format from the format chooser.
- Set the JPG quality (around 90 for near-original, lower for smaller files); transparent areas are flattened onto white automatically.
- Save — each JPG is written next to its original PNG, no upload required.
Lossless PNG in, lossy JPG out
PNG is lossless; JPG is lossy. Converting trades a little fidelity for a much smaller file, and MiniMax Converter gives you a quality slider so you decide the balance. Around 90 is visually indistinguishable from the source for photos; drop to 75-80 for the smallest sharable files. JPG has no transparency, so any alpha channel is flattened onto a white background during conversion.
Drop a whole folder of PNGs at once
This isn't one-at-a-time. Drag a single screenshot or a folder full of PNG exports onto the window and MiniMax Converter batch-converts them in parallel, writing a .jpg next to each original. Photographs and screenshots with flat backgrounds shrink the most; the alpha flatten happens automatically, so logos and UI captures with transparent edges come out on a clean white backdrop.
Why offline?
Online PNG-to-JPG converters cap upload sizes, queue your files behind everyone else's, and pass your images through someone else's server. Local conversion via Pillow has no file-size limit, runs at the speed of your disk, and your images never leave your machine. No upload, no ads, no watermark, no account.
Questions and answers
What happens to transparency when I convert PNG to JPG?
JPG cannot store transparency, so any transparent or semi-transparent areas are flattened onto a solid white background. If you need to keep transparency, stay with PNG or convert to WebP instead.
Will the JPG look worse than the PNG?
JPG is a lossy format, so there is always some loss, but at a quality setting around 90 it is visually indistinguishable from the PNG for most photos and screenshots. Lower settings shrink the file further at the cost of visible artifacts in fine detail and sharp edges.
Can I convert many PNG files at once?
Yes. Drop multiple files or an entire folder and they are converted in parallel, with each JPG saved next to its original PNG. There is no limit on how many you process.
Is there a file-size limit?
No. Because everything runs locally there is no upload cap or size restriction. Even very large PNG exports convert without going through any server.
Related tools
Get MiniMax Converter
Cross-platform desktop app. Linux free for non-commercial use; Windows & macOS one-time €20 license. No subscription, no telemetry, no account.