PNG vs JPG: Which Should You Use?

If you've ever saved an image and been asked to choose between PNG and JPG, you've probably picked whichever one sounded more familiar and moved on. Most of the time that's harmless, but the two formats compress images in fundamentally different ways, and picking the wrong one can mean a photo that's needlessly large or a logo that looks noticeably worse than it should.

The core difference: lossy vs. lossless

JPG is a lossy format. When you save a JPG, the encoder throws away some image detail that it calculates most people won't notice, in exchange for a much smaller file. Save the same JPG over and over through multiple rounds of editing, and that loss compounds — each save discards a little more.

PNG is lossless. Every pixel you started with is exactly the pixel you get back; nothing is approximated or discarded. That precision is great for anything with sharp edges or flat colors, but it means PNG can't compress photographic detail nearly as aggressively as JPG, so photos saved as PNG are often several times larger than the same photo as a JPG.

When to use JPG

• Photos — camera photos, phone photos, anything with lots of gradients, skin tones, or natural detail. JPG's compression is specifically tuned for this kind of image, and at quality settings above 80-85%, most people can't spot the difference from the original.
• Anywhere file size matters most — email attachments, image galleries, or upload forms with tight size limits.

The trade-off: JPG has no transparency support at all, and it isn't a great fit for text, logos, or UI screenshots — the compression tends to introduce fuzzy "artifacts" around sharp edges and small text.

When to use PNG

• Screenshots and UI mockups — flat colors and sharp text compress well under PNG's lossless algorithm and stay perfectly crisp.
• Logos and graphics that need a transparent background — PNG is one of the few common formats with a proper alpha (transparency) channel.
• Anything you'll re-edit and re-save repeatedly — since PNG never loses quality on save, it won't degrade the way a JPG does if you keep opening and re-saving it in an editor.

The trade-off: PNG files are typically much larger than JPG for anything photographic, since there's no aggressive lossy compression happening.

A simple way to decide

Ask yourself: does this image need a transparent background, or is it mostly flat colors and text? If yes, use PNG. Is it a photo, and do you mainly care about a small file size? Use JPG. If you're not sure, try both — converting a PNG to JPG or a JPG to PNG takes a few seconds and costs nothing, so you can compare file sizes and visual quality side by side before deciding.

What about WebP?

Increasingly, the honest answer is "neither — use WebP instead." WebP generally beats both JPG and PNG at their own game: smaller files than JPG at similar photo quality, and full transparency support like PNG, all in one format. The catch is that a small number of older tools, printers, and upload forms still don't accept it, which is why PNG and JPG remain the safer default for anything that needs to work absolutely everywhere. If you want to try it, our PNG to WebP and JPG to WebP tools make the comparison easy.

Already saved as the wrong format?

Converting after the fact is quick and doesn't require reshooting or redesigning anything. babapic's PNG to JPG and JPG to PNG converters run entirely in your browser — your image is decoded and re-encoded locally using the Canvas API, so nothing is ever uploaded to a server. If file size is the real goal rather than the format itself, our Compress Image tool can shrink either format directly, often without needing to convert at all.