Most operating systems default to saving screenshots as PNG. But with JPG typically producing smaller files, you might wonder whether that's actually the better choice. Here's when each format is the right call for screenshots.
The Short Answer: PNG for Screenshots (Usually)
PNG is the better default for screenshots, and the reason major operating systems all use it is straightforward: PNG preserves text sharpness and UI accuracy with zero quality degradation.
Why PNG and JPG Handle Screenshots Differently
The key difference is how each format compresses image data:
| Feature | PNG | JPG |
|---|---|---|
| Compression type | Lossless (no degradation) | Lossy (some degradation) |
| Text sharpness | ◎ Crisp | △ Can blur |
| Photo compression | △ Large files | ◎ Compact |
| Transparency support | Yes | No |
JPG uses lossy compression — it analyzes the image and discards data it deems least perceptible. This works beautifully for photos with smooth gradients. But screenshots typically contain text, sharp UI edges, icons, and buttons — and JPG compression creates visible artifacts (blurring and "ringing") around high-contrast edges.
PNG uses lossless compression, preserving every pixel exactly. The result is that text and UI elements remain sharp and accurate.
Why PNG Is Better for Most Screenshots
Text stays crisp
JPG-compressed screenshots often show mosquito noise (blocky artifacts) around text. This can make instructions, tutorials, or documentation screenshots hard to read — especially at small font sizes.
PNG renders text exactly as it appears on screen, pixel for pixel.
Colors and UI elements are accurate
When you're capturing a color swatch, a chart, or a specific UI state for comparison purposes, PNG ensures that what you capture is exactly what the viewer sees. JPG subtly shifts colors during compression, which matters in contexts where accuracy is important.
Why every major OS defaults to PNG
- Windows:
Win + PrintScreensaves as PNG - macOS:
Cmd + Shift + 3/4saves as PNG - iPhone: Power + volume button saves as PNG
- Android: Varies by manufacturer, but PNG is common
These platforms chose PNG because it's simply the right format for the job.
When JPG Makes Sense for Screenshots
PNG isn't always the best choice. Here are cases where JPG is reasonable:
Screenshots with lots of photos
If you're screenshotting an image-heavy page (a photo gallery, social media feed, or product catalog), PNG files can get very large because it struggles to compress photographic content efficiently. JPG will produce a much smaller file with minimal perceptible quality loss.
Quick sharing via chat apps
If you just need to send a screenshot over LINE, Slack, or another messaging app and exact fidelity isn't critical, JPG's smaller size means faster upload and delivery.
Reference images for web use
If a screenshot is being used as a rough visual reference on a web page (not for documentation or instruction), JPG or WebP can reduce page load time with acceptable quality.
How to Control Screenshot Format by Platform
Windows
Default: PNG (via Win + PrintScreen)
The Snipping Tool lets you choose PNG, JPG, or GIF when saving:
- Take a snip
- Click File → Save as
- Choose your format from the dropdown
macOS
Default: PNG
To change the format for all future screenshots:
- Press
Cmd + Shift + 5to open the screenshot toolbar - Click Options
- Select a different format (JPG is available)
iPhone
Default: PNG (fixed — can't be changed in system settings)
To convert iPhone screenshots to JPG, use FileConv: drag and drop the PNG file and export as JPG.
Android
Default: Varies by device — many save as PNG, some as JPG
Converting Screenshots Between Formats
If you need to convert PNG screenshots to JPG (to reduce file size) or to WebP (for web use), FileConv handles both conversions directly in the browser. No app to install, and nothing is sent to a server.
Converting screenshots to WebP is especially effective for web publishing: WebP gives you significantly smaller file sizes than PNG while maintaining the sharpness that makes screenshots readable.
Summary
- PNG is the right default for screenshots — it preserves text sharpness and UI accuracy
- JPG compression causes blurring and artifacts around text and sharp edges
- Every major OS saves screenshots as PNG for good reason
- JPG makes sense when file size matters more than pixel-perfect accuracy
- Convert to WebP for web publishing to get the best of both: small size and sharp text