WebP vs JPG vs PNG: choosing the right image format

Most people pick an image format by accident. The camera saved a JPG, so it stays a JPG. The screenshot tool wrote a PNG, so it stays a PNG. That works fine until the file is too big to email, the upload is rejected, or a website starts loading slowly. Then you have to think about formats, and the three you keep running into are JPG, PNG, and WebP.

This guide is a practical walk-through. Not the history of each codec, not a benchmark with charts. Just what each format is good at, where it falls down, and how to choose when you have a real file in front of you.

The short version

If you are in a hurry:

• JPG for photos and any image with smooth tonal gradients (sunsets, skin, fabric). Small files, no transparency.
• PNG for screenshots, logos, illustrations, and anything that needs a transparent background. Larger files, perfectly sharp.
• WebP when you want the visual quality of PNG or JPG at roughly 25 to 35% smaller file size, and you control where the image will be displayed (modern browsers, current Office, recent design tools).

If you want to understand why each rule of thumb works, keep reading.

What JPG is actually doing

JPG (or JPEG) is a lossy format from 1992. "Lossy" means it throws away data that the human eye is not great at noticing. It breaks the image into 8x8 pixel blocks, runs a math transform on each one, and then aggressively discards the fine details inside that block. The result is a file that can be 10x smaller than the raw pixel data while looking almost identical.

It is brilliant for photographs because real photos are full of gentle gradients, noise, and texture. None of that needs to be pixel-perfect. The eye reads "skin" or "sky" and fills in the rest. JPG leans on this hard.

Where JPG falls apart:

• Sharp edges and text. The 8x8 block compression smears edges. A screenshot of an article saved as JPG will have a soft, halo-like fringe around every letter.
• Flat colors. Logos with a single solid background often pick up faint banding or color shift in JPG. PNG keeps them pristine.
• Transparency. JPG does not support it at all. If your image has a transparent background, exporting to JPG fills it with white (or whatever color the encoder chooses).
• Repeat saves. Every time you save a JPG, it re-compresses and loses a little more quality. Photoshopping a JPG five times leaves visible artifacts.

What PNG is actually doing

PNG arrived in 1996 specifically because GIF had patent problems and JPG was bad at sharp graphics. It is a lossless format, which means a PNG file contains an exact, pixel-for-pixel record of the image you saved. Nothing is approximated. Open it, save it, open it again a thousand times: it stays identical.

That faithfulness is why PNG is the default for screenshots, UI mockups, logos, icons, and anything where you need crisp edges. It also supports a full alpha channel, so transparent backgrounds work properly, including semi-transparent shadows and soft edges.

The downside is size. A typical 1080p photograph as PNG can be 5 to 10 megabytes; the same photo as JPG might be 400 kilobytes. PNG is also slower to encode and decode than JPG, although on modern hardware that almost never matters.

Where PNG shines:

• Screenshots. Text and UI elements stay perfectly readable.
• Logos and icons. Sharp edges, accurate colors, transparency.
• Pixel art or generated images. No artifacts at color boundaries.
• Any image you will keep editing. Lossless means saving repeatedly does no damage.

What WebP is doing differently

WebP came out of Google in 2010. It is essentially "what if we redesigned JPG and PNG from scratch knowing what we know now about compression?" It supports both lossy and lossless modes, transparency, and animation. For a typical photo, lossy WebP is around 25 to 35% smaller than the equivalent quality JPG. For a typical screenshot, lossless WebP is about 20 to 25% smaller than PNG.

Those numbers are why every major website ships WebP versions of their images. The savings add up fast when you serve millions of page views a day. For an individual person sending a file to a friend, the savings matter less; for a website owner trying to keep load times down, they matter a lot.

The catch with WebP is reach. Every modern browser supports it (Chrome, Firefox, Safari, Edge), and most current creative software does too. But if the person you are sharing with is on a very old phone, an old version of PowerPoint, or some niche image viewer, they may see "file not supported." That gap shrinks every year, and in 2026 it is small enough that WebP is a reasonable default for most workflows.

The decision tree

If you do not want to think about this every time, use this short flow:

1. Does the image have transparency, or sharp text or graphics? If yes, jump to step 3.
2. It is a photograph or similar continuous-tone image. Use JPG at quality 80 to 90 for most cases. Use WebP if the destination supports it and you want smaller files.
3. It needs to stay sharp. Use PNG if the destination is unknown or older. Use lossless WebP if the destination is modern.

About "quality" sliders

When you compress a JPG or WebP you usually see a quality slider from 0 to 100. The numbers are not standardized between encoders, but the practical mapping is roughly:

• 95 to 100. Almost indistinguishable from the original, but the file barely shrinks. Wasted bytes for most uses.
• 80 to 90. The sweet spot. Compression artifacts exist but are very hard to see, and the file is much smaller.
• 65 to 80. Visible if you know where to look, especially in flat areas or on text. Fine for thumbnails and quick shares.
• Below 65. Compression becomes obvious. Use only when file size matters more than the picture.

A common mistake is leaving JPG at 100 because "100 means best." For photographs, 85 is invisible and the file is half the size.

Quick converter tips

Whichever tool you use, a few things will save you headaches:

• Resize before compressing. A 6000-pixel photo scaled down to 1920 pixels for the web is a much bigger win than tweaking quality.
• Strip metadata if privacy matters. Phones embed GPS location in EXIF data. Most converters can strip this on export.
• Keep an original. Compression is one-way. Once you have over-compressed and saved, the detail is gone. Store an unedited copy somewhere.