PNG is the go-to format for screenshots, graphics with text, diagrams, and anything that needs transparency. It's lossless — your image data is preserved exactly as-is.
But PNG files are big. A photo saved as PNG can be 5–10x larger than the same photo as a JPG. And for most real-world uses — posting online, sending via email, embedding in a document — that size doesn't buy you anything.
When to Convert PNG to JPG
Social media and websites. JPG files load faster, which means better Core Web Vitals and better user experience. Most CMS platforms default to JPG for image uploads anyway.
Email attachments. Large PNGs get blocked or heavily compressed by email providers. JPGs transmit reliably and look good in the inbox.
Photo archives. If you're storing photos (not graphics), JPG is the standard format. Same visual quality, a fraction of the storage.
Presentations. PowerPoint and Keynote compress images on insert — converting to JPG before adding them prevents double-compression artifacts.
When to Keep PNG
- Screenshots with text — text stays crisp in PNG, JPG introduces blur on edges
- Graphics with transparency — PNG supports alpha channels, JPG doesn't
- Print-ready files — print workflows often require PNG or TIFF
- Files you'll edit again — PNG preserves data for re-editing; JPG is a final format
How to Convert PNG to JPG
- Open imageconvert.polsia.app
- Drop your PNG file on the converter
- Select JPG as the output format
- Download your file
The converter handles the compression. Your original transparency is lost (JPG doesn't support it), but everything else looks the same at high quality settings.
PNG vs JPG: The Core Difference
| PNG | JPG | |
|---|---|---|
| Compression | Lossless | Lossy |
| File size | Large | Small |
| Transparency | Yes (alpha) | No |
| Best for | Graphics, screenshots, diagrams | Photos, web, email |
| Text quality | Crisp | Slightly softened |
Reducing JPG File Size Further
After converting to JPG, you can also target WEBP as your output format. WEBP typically produces files 25–35% smaller than JPG at the same visual quality — useful if you're optimizing for web performance.
Common Mistakes to Avoid
Converting a screenshot with text. The text will look noticeably worse in JPG. Keep screenshots as PNG.
Running multiple conversions. PNG → JPG → resize → JPG means double compression. Work from the original file each time.
Forgetting about the transparency. If your PNG has a transparent background, that background becomes white in the JPG. If you need the transparent background, keep PNG.
Bottom Line
Convert PNG to JPG when you're sharing photos online, via email, or embedding in documents. Keep PNG for graphics with text, transparency, or anything you'll edit again. The conversion takes 3 seconds — and the file size savings are real.