Difference Between JPG and PNG: Which Format to Use and When

You export a design, upload it, and something looks off. The photo is fine, but the logo has a faint grey haze around the letters. Or a screenshot that should be razor sharp has gone soft and speckled.

Most of the time the culprit is the file format. JPG and PNG are the two image formats you meet most often, and they look identical in a file browser. Under the hood, they were built for very different jobs.

Here is what actually separates them, which one holds up better in different situations, and a quick way to choose without overthinking it.

The short answer

JPG is designed for photographs. It throws away detail your eye is unlikely to notice in order to keep files small.

PNG is designed for graphics. It keeps every pixel exactly as it was and supports transparency, but photos saved as PNG are usually much larger.

If you remember only one rule, make it this: photos go in JPG, anything with sharp edges, text or a transparent background goes in PNG.

How JPG compresses an image

JPG (short for JPEG, after the Joint Photographic Experts Group that created it) uses lossy compression. When you save, the encoder splits the image into small blocks and simplifies the fine colour variation inside each one.

On a photo of a sunset or a face, those simplifications are almost invisible, because natural images are full of soft gradients and noise. That is why a JPG can be a fraction of the size of the same photo stored without loss.

The quality slider in most editors controls how aggressive that simplification is. High settings look clean, while low settings start to show blocky squares and muddy colour.

How PNG compresses an image

PNG uses lossless compression. It finds repeated patterns in the pixel data and stores them more efficiently, a bit like zipping a file, and nothing is discarded.

Open a PNG, save it, and open it again, and every pixel is exactly the same. That makes it reliable for files you will edit repeatedly or need to keep pixel perfect.

The trade-off shows up with photographs. A photo has very few exact repeats, so lossless compression cannot shrink it much, and a PNG photo is often several times larger than a good JPG.

Is JPG or PNG higher quality?

People often ask which format is higher quality, and the honest answer is that PNG is lossless and JPG is not. A PNG keeps the image exactly as you exported it.

That does not mean a JPG looks worse in practice. A photo saved at a high JPG quality setting is usually indistinguishable from the PNG version at normal viewing size, at a much smaller file size.

Where JPG clearly loses is sharp contrast. Text, line art, icons and interface screenshots develop fuzzy halos and stray speckles around the edges, often called artifacts. PNG keeps those edges crisp.

JPG also suffers from repeated saving. Each time you edit and re-save a JPG, it compresses again and loses a little more detail. If a file is going to be edited many times, keep a lossless master and export a JPG only at the end.

Transparency is the deciding feature

PNG supports an alpha channel, which means each pixel can be fully transparent, fully solid, or anything in between. That is what lets a logo sit cleanly on a coloured website header or a product shot float on any background.

Standard JPG has no transparency at all. If you save a cut-out image as a JPG, the transparent area gets filled with a solid colour, usually white or black.

So if you have removed a background, keep the result as a PNG. Our free background remover exports transparent images for exactly this reason, and the guide on making a transparent background image explains which formats quietly drop transparency.

JPG vs JPEG vs PNG: clearing up the names

JPG and JPEG are the same format. The shorter extension dates from older versions of Windows, which only allowed three characters after the dot in a file name, so .jpeg became .jpg.

Today both extensions are interchangeable. Renaming a .jpeg file to .jpg changes nothing about the image inside.

Renaming a .png file to .jpg, on the other hand, does not convert it. The data is still a PNG, and some apps will refuse to open it or behave strangely. To change formats, export or convert the file properly.

JPG or PNG for print?

For printing photos at home or through an online photo lab, a high-quality JPG is usually what they expect. It keeps upload sizes reasonable and looks excellent on paper when the resolution is high enough.

What matters most for print is pixel count, not the format. As a rough guide, many printers recommend around 300 pixels per inch at the final print size, so a 10 by 15 cm print needs an image of about 1800 by 1200 pixels.

PNG works for printed graphics such as stickers, labels or posters with flat colour and text, where crisp edges matter. Keep in mind that PNG has no CMYK colour mode, while professional print shops often work in CMYK and may ask for a PDF or TIFF instead.

For logos and illustrations that will be printed at many sizes, neither format is ideal. A vector file scales without losing sharpness, and the comparison of vector vs raster images explains when it is worth making that switch.

PNG-8, PNG-24 and why file sizes vary

Not every PNG is the same. A PNG-8 file uses a palette of up to 256 colours, which keeps simple graphics like flat icons and charts very small.

A PNG-24 (or PNG-32 with transparency) stores full colour for every pixel. It handles gradients and detailed artwork, but the files are larger.

That is also why a PNG can sometimes beat a JPG on size. For a simple graphic with big areas of flat colour, lossless compression works extremely well, and the PNG may end up smaller than a high-quality JPG of the same image.

Which is better for websites?

On the web, file size affects how fast a page loads, so the choice matters more than it seems. A large PNG hero photo can weigh several megabytes, while a well-compressed JPG of the same photo might be a few hundred kilobytes.

Use JPG for photographic content such as blog covers, product photos and backgrounds. Use PNG for logos, icons, diagrams, screenshots and anything that needs transparency.

It is worth knowing that newer formats such as WebP and AVIF can handle both jobs, offering lossy or lossless compression and transparency in one file. All major browsers now support WebP, so it is a sensible option if your platform allows it.

A quick way to decide

Ask yourself three questions before you hit export.

Is it a photograph with soft colours and no transparency? Save it as a JPG at a high quality setting.

Does it contain text, sharp lines, flat colours or a transparent area? Save it as a PNG.

Will you keep editing it? Keep a lossless master, such as a PNG or your editor's native file, and export a JPG copy when you are finished.

The bottom line

The difference between JPG and PNG comes down to what you are willing to trade. JPG gives up a little invisible detail for small files, which suits photos. PNG keeps everything, including transparency, at the cost of size.

Pick the format to match the content, not out of habit, and most of the blurry logos and bloated pages disappear on their own.

Cover image: LucaLindholm, CC BY 4.0, via Wikimedia Commons.