PNG vs JPG: Which format should you use (and how to convert)

The core difference: how each format compresses

JPG uses lossy compression, which approximates image data to reduce file size. PNG compresses losslessly, so decoded pixel values can be recovered exactly from that PNG. PNG also supports alpha transparency, while ordinary JPG does not. File size depends on the content and settings: PNG may be compact for flat graphics, but photographic PNG files are often much larger than JPG copies.

When PNG is the better choice

• Screenshots, especially ones with text or sharp UI edges. JPG compression tends to blur fine lines and create visible artifacts around text.
• Logos, icons, and flat-color graphics, where crisp edges matter more than file size.
• Anything that needs a transparent background, like a logo you'll place over different colored backgrounds.
• Images you'll re-save repeatedly while editing, since JPG loses a little quality every time it's re-compressed and PNG doesn't.

When JPG is the better choice

• Photographs, when a lossy copy is acceptable and the chosen quality has been inspected at the intended display size.
• Website photographs that need broad compatibility, although WebP or AVIF may produce smaller files in supported workflows.
• Email attachments or upload forms with file size limits.
• Sharing large batches of photos, where PNG's file sizes would add up fast.

What the difference looks like in practice

Image type	As PNG	As JPG (good quality)
12MP camera photo	~20–30 MB	~2–4 MB
Screenshot with text	Sharp, no artifacts	Slightly blurred edges

A photographic JPG can be much smaller than a PNG, but the visual difference depends on quality, repeated encoding, image content, display size, and close inspection. For screenshots with text, PNG usually preserves hard edges cleanly. JPG can introduce ringing, blocking, or softness, especially at lower quality settings.

Why does my computer default to PNG for screenshots?

PNG is a common screenshot default because interface captures contain flat colors, text, and sharp boundaries that lossless compression handles well. Defaults can vary by operating system, version, tool, and user settings. PNG screenshots are not automatically larger than every alternative; the result depends on the captured content and the encoder.

What about newer formats like WebP?

WebP supports lossy and lossless compression plus transparency, and AVIF adds another modern option. Either may outperform PNG or JPG in a particular test, but there is no universal size advantage for every image and setting. PNG and JPG retain very broad software support; WebP and AVIF compatibility should be checked against the oldest applications and devices in the workflow.

Converting between PNG and JPG

Convert PNG to JPG when the files are photographic, transparency is unnecessary, and a smaller lossy copy suits the destination. For screenshots, logos, and text-heavy graphics, first try PNG optimization or a modern lossless format. Conversion to JPG flattens transparency against a background color and can discard metadata or color information, so review the output before deleting the source.

Choose according to the image

Does PNG-to-JPG conversion reduce quality? Yes, JPG encoding is lossy. The change may be difficult to notice in some photographs at a suitable setting, but it can be obvious around text, gradients, and sharp edges.

Can JPG be converted back to PNG? Yes, but PNG will preserve only the pixels decoded from the JPG. It cannot recover details discarded by earlier JPG compression, and the resulting file may be larger.

Which format is a useful starting point? Try JPG for ordinary photographs when lossy compression is acceptable. Use PNG for transparency, screenshots, line art, or graphics that require lossless pixels. Then compare actual exports instead of relying on the label alone.

Neither format wins every comparison. Keep the original when possible, export for the destination, and judge the result by transparency, edge quality, compatibility, and measured file size.