.png .jpg

Convert PNG to JPG on Mac

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 can reduce file sizes by 60-80% while keeping photos looking great — making them easier to share, upload, and store.

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Why convert PNG to JPG?

Reduce file sizes by 60-80% — a 5MB PNG screenshot becomes under 1MB as JPG
Universal compatibility — JPG works on every device, app, and website
Faster email attachments and social media uploads
Batch convert hundreds of PNG screenshots to JPG in one go
Adjustable quality slider to balance size and sharpness
All conversion happens locally on your Mac — nothing uploaded online

PNG vs JPG file sizes

File Type	PNG	JPG	Note
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

Conversion speed: 500 PNG files in ~2 minutes on Apple Silicon

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

Open Picmal

Download and open Picmal on your Mac.

Add your PNG files

Drag and drop your PNG files or entire folders into Picmal.

Select JPG and convert

Choose JPG as the output format and click Convert.

PNG vs JPG

.png

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

.jpg

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

Frequently asked questions

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. Picmal handles everything locally.

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?

PNG to JPG typically reduces file sizes by 60-80%. A 5MB PNG screenshot becomes 800KB-1.2MB as JPG at 90% quality. Photos compress even better than screenshots.

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.