Convert PNG to JPG on Mac
Shrink PNG screenshots into small JPGs for email and the web. A 4.8MB screenshot becomes 680KB. Nothing leaves your Mac.
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Why convert PNG to JPG?
PNG files are great for graphics and transparency, but they're far too large for sharing photos by email, uploading to social media, or using on the web. Converting PNG to JPG often cuts file sizes by 80% or more while keeping photos looking great, making them easier to share, upload, and store.
- Cut file sizes by 80% or more: a 4.8MB Mac screenshot becomes 680KB as JPG
- Universal compatibility. JPG works on every device, app, and website
- Faster email attachments and social media uploads
- Adjustable quality slider to balance size and sharpness
- All processing happens locally on your Mac, files never leave your device
PNG vs JPG file sizes
| File type | PNG | JPG | Saved |
|---|---|---|---|
| Mac screenshot (2560×1440) | 4.8 MB | 680 KB | 86% smaller |
| Photo exported as PNG | 8.2 MB | 1.1 MB | 87% smaller |
| UI design export (1920×1080) | 2.8 MB | 520 KB | 81% smaller |
| Chart/diagram (1200×800) | 1.5 MB | 280 KB | 81% smaller |
When to convert PNG to JPG
Sharing screenshots by email or Slack
Mac screenshots are saved as PNG and can be 3-8MB each. Convert to JPG before sharing to keep file sizes under 1MB, faster uploads and no attachment limits.
Uploading photos to social media
Some photo editors export as PNG by default. Social platforms re-compress uploads anyway, so converting to JPG first gives you control over quality and faster uploads.
Reducing storage on NAS or cloud drives
A folder of PNG photos can take 5-10x more space than JPG. Batch convert to JPG to reclaim storage on your Mac, NAS, or Google Drive.
Web image preparation
If your CMS or platform doesn't support WebP yet, JPG is the best alternative for photos. Convert design exports from PNG to JPG for faster-loading pages.
How to convert PNG to JPG on Mac
- 1
Open Picmal
Download and open Picmal on your Mac.
- 2
Add your PNG files
Drag and drop your PNG files or entire folders into Picmal.
- 3
Select JPG and convert
Choose JPG as the output format and click Convert.
PNG vs JPG
PNG
Portable Network Graphics
Lossless image format standardized as ISO/IEC 15948 and maintained as a W3C Recommendation. PNG supports full alpha transparency and is the preferred format for graphics, screenshots, and images requiring sharp edges.
Best for
Screenshots, logos, graphics with transparency
Defined by ISO/IEC 15948 / W3C Recommendation. Specification
JPG
Joint Photographic Experts Group
The most widely supported image format, standardized as ITU-T T.81 in 1992. JPG (also called JPEG) is compatible with virtually every device and application, and remains the universal default for photographic content.
Best for
Sharing photos, web uploads, and email attachments
Defined by ITU-T T.81 / ISO/IEC 10918-1. Specification
Frequently asked questions
Something not covered here? Write to support@picmal.app
How do I convert PNG to JPG on Mac?
Open Picmal, drag your PNG files or folders into the window, select JPG as the output format, adjust quality if needed, and click Convert.
Does converting PNG to JPG lose quality?
JPG uses lossy compression, so there is some quality reduction. At 90-95% quality, the difference is invisible for photos. For graphics with sharp text, you may notice slight softening of edges.
How much smaller will my files be?
Usually by 80% or more. In the examples on this page, files shrink 81-87%: a 4.8MB Mac screenshot becomes 680KB as JPG. Photos saved as PNG shrink the most.
Will I lose transparency when converting to JPG?
Yes. JPG doesn't support transparency. Transparent areas become white (or the background color). If you need transparency, convert to WebP instead, which supports both transparency and small file sizes.
Can I batch convert PNG to JPG?
Yes. Drag entire folders of PNG files into Picmal and convert them all to JPG at once with the same quality settings.
Convert PNG to JPG with Picmal
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