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Image Formats Explained: PNG vs JPG vs WebP
PNG, JPG and WebP all store pictures, but they store them in different ways — and the right pick depends on what is in the picture. Here is the short version, with real file sizes from one test photo.
One photo, three formats
We saved the same photo-like 800 by 600 test image in three formats. As PNG it was 1,123.3 KB. As JPG at quality 0.85 it was 183.2 KB — about six times smaller. As WebP at quality 0.85 it was 206.6 KB, close to JPG on this image, and on many photos WebP comes out smaller still. The same image in flat colors told the opposite story: a flat-color graphic was 3,878 bytes as PNG and 49,722 bytes as JPG at quality 0.85 — PNG won by a wide margin there. Format is not about which is best in general; it is about what the picture is made of.
JPG — for photos
JPG throws away a little fine detail that most eyes cannot see, and in return it makes photos much smaller. That is why it is the usual pick for photos on the web, in emails, and on social media. Its limits: it has no transparency, so a clear background becomes solid (usually white), and saving the same JPG over and over adds a little more damage each time. Use the quality slider on the image compressor to find your middle ground — 0.80 to 0.90 looks good for most photos, and our test photo went from 339.1 KB at quality 0.95 to 112.7 KB at quality 0.70.
PNG — for sharp graphics
PNG keeps every pixel exactly as it is, with no loss at all. That makes it the right pick for logos, screenshots, text in images, and anything with flat colors and sharp edges — the things JPG makes blurry. It also keeps clear backgrounds. The price is size: a busy photo saved as PNG can be several times bigger than the same photo as JPG (1,123.3 KB against 183.2 KB in our test). For photos, PNG is usually the wrong pick; for graphics, it is the right one.
WebP — the newer middle ground
WebP is a newer format that does both jobs: it can shrink photos like JPG, and it can keep clear backgrounds like PNG. On many photos it beats JPG at the same quality — our test image was close (206.6 KB against 183.2 KB at quality 0.85), and on other photos WebP often wins. The catch is older software: a few old programs and old phones still cannot open WebP. If your readers are on modern browsers and phones, WebP is a good pick; if you are not sure, JPG is the safe one.
Which format should I use?
| What it is | Use this | Why |
|---|---|---|
| A photo | JPG or WebP | Small files, and the small loss is hard to see |
| A logo or icon | PNG or WebP | Sharp edges stay sharp, and clear backgrounds work |
| A screenshot with text | PNG | Text stays readable; JPG makes it blurry |
| A photo for an old system | JPG | Opens everywhere, with no surprises |
| The smallest file you can get | WebP | Often smaller than JPG at the same quality |
When in doubt, try the image converter: convert the same picture to two formats and compare the sizes and the look. That takes a minute, and it beats guessing.
Frequently asked questions
Which image format is best for photos?
JPG or WebP. In our test, a photo-like 800 by 600 image was 183.2 KB as JPG and 206.6 KB as WebP at quality 0.85, against 1,123.3 KB as PNG.
Is WebP better than JPG?
Often, but not always. WebP is usually smaller at the same quality and keeps clear backgrounds, but JPG opens everywhere, including old software. For a photo going to people you do not know, JPG is the safe pick.
When should I use PNG?
For logos, icons, screenshots and anything with sharp edges or flat colors — and whenever you need a clear background. A flat-color graphic in our test was 3,878 bytes as PNG and 49,722 bytes as JPG.
Does converting a JPG to PNG improve quality?
No. Once detail is thrown away by JPG, converting to PNG cannot bring it back — the file just gets bigger. Convert the other way, from PNG to JPG, when you want a smaller file.
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