PNG vs JPEG: definition and when to use each
PNG is a lossless image format ideal for UI screenshots; JPEG is a lossy format ideal for photos. For screen captures the answer is almost always PNG.
PNG is a lossless image format ideal for UI screenshots; JPEG is a lossy format ideal for photos. For screen captures the answer is almost always PNG.
The reason is content-shape. JPEG compression is tuned for photographs — gradual color transitions, soft edges, no sharp boundaries. UI screenshots are the opposite: flat regions of color, hard edges, text rendered at high contrast. JPEG handles them poorly, producing visible ringing around text and color shifts in solid regions.
What the choice costs
A 1920×1080 UI screenshot as PNG runs perhaps 200–500 KB depending on content. The same image as JPEG might be 80 KB but with visible compression artifacts that make the screenshot look low-quality and may obscure the bug being reported.
For visual feedback, the file size difference is rarely worth the quality cost. PNG is the default, and the times to reconsider are narrow: capturing a photograph through the screen, archiving thousands of images where storage matters, or fitting an image into a context-sensitive size budget.
Frequently asked questions
Why does PNG matter for screenshots?
Because UI screenshots are mostly flat colors and crisp edges — exactly the content JPEG compression handles worst. JPEG introduces visible artifacts around text and lines; PNG keeps them sharp.
When should I use JPEG?
For photos, especially when file size matters. Photos compress well under JPEG with little visible loss; PNG produces much larger files for the same image.
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