Convert JPEG to PNG on Mac
While JPG is the most common image format, it lacks two things that many workflows demand: transparency and lossless editing. PNG supports both. If you need to add a transparent background to a photo, layer images in a design tool, or ensure no further quality loss during editing, converting JPG to PNG is the first step. Jollycat makes this conversion instant on your Mac, preserving all image detail in a lossless format.
JPEG vs PNG
| Property | JPEG | PNG |
|---|---|---|
| Type | lossy | lossless |
| Compression | DCT-based lossy | DEFLATE lossless |
| Transparency | No | Yes |
| Animation | No | No |
| Bit Depth | 8-bit | 8/16-bit |
| File Extension | .jpg | .png |
| Key Advantage | Universal compatibility across all devices | Lossless quality preservation |
How to Convert JPEG to PNG on Mac
Add your JPG images
Drag .jpg or .jpeg files from Finder into Jollycat. You can import product photos, textures, backgrounds, or any JPEG image you need in PNG format.
Select PNG output
Choose PNG as the target format. Since PNG is lossless, there is no quality setting to adjust — every pixel from the decoded JPG is preserved exactly.
Convert
Click Convert. Jollycat decodes your JPG and writes a lossless PNG. The output file will be larger than the original, but it's now safe for editing without further quality degradation.
When to Convert JPEG to PNG
Preparing images for editing workflows
If you plan to repeatedly open, edit, and save an image, working in PNG prevents the cumulative quality loss that occurs each time a JPG is re-saved. Convert to PNG first, then edit freely.
Creating images with transparency
JPG does not support transparency. If you need to remove a background (for a product photo, portrait, or logo) and save the result with a transparent background, you need PNG format.
Software that requires PNG input
Some design tools, game engines, and web applications specifically require PNG files. 3D textures, sprite sheets, and UI assets are commonly expected in PNG format.
JPEG to PNG Conversion Tips
Converting JPG to PNG does not improve image quality or recover compression artifacts. The JPG was already lossy — PNG simply preserves the current state without adding further degradation.
Expect PNG files to be 3-10x larger than the original JPG. This is because PNG uses lossless compression, which preserves all pixel data. The trade-off is worth it if you need transparency or plan to edit the file.
If you're converting JPG to PNG solely for web use and don't need transparency, consider keeping the JPG — it will load faster due to smaller file size. PNG is best when you specifically need its features.
Frequently Asked Questions
Does converting JPG to PNG improve image quality?
No. The quality loss from JPG compression is permanent. Converting to PNG preserves the current quality in a lossless format, which prevents any further degradation, but it cannot restore pixels that were already discarded by JPG compression.
Why is my PNG file so much larger than the original JPG?
JPG uses aggressive lossy compression that discards visual data to achieve small files. PNG uses lossless compression that preserves every pixel, resulting in much larger files. A 500 KB JPG might become a 3-5 MB PNG. This is normal and expected — the larger file contains all the image data without lossy artifacts.
When should I use PNG instead of JPG?
Use PNG when you need transparency, when you'll be editing the image multiple times (to avoid cumulative JPG quality loss), or when your workflow requires PNG specifically. For sharing photos, web images, and email attachments where you don't need these features, JPG is usually the better choice.
Ready to Convert JPEG to PNG?
Jollycat handles JPEG to PNG conversion and 1,650+ other format conversions. All offline on your Mac.
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