PNG vs JPG vs WebP: Which Image Format Should You Use?

PNG, JPG, and WebP are the three image formats you will meet most often on the web, and each one is good at a different job. JPG keeps photographs small, PNG keeps logos and screenshots crisp with transparent backgrounds, and WebP is a newer format that tries to give you the best of both at a smaller file size. This guide explains how the three differ in compression, transparency, file size, and browser support, walks through a quick decision list, and shows what happens when you convert an image from one format to another.

JPG / JPEG: best for photographs

JPG (also written JPEG) uses lossy compression, which means it throws away some image detail in exchange for a much smaller file. For photographs - skies, faces, landscapes, anything with smooth gradients and millions of subtle color shifts - this trade-off is almost invisible to the eye, and the file savings are large. That is why nearly every camera and phone saves photos as JPG by default.

• Compression: lossy. Quality drops slightly each time the file is re-saved.
• Strength: small files for full-color photographs.
• Weakness: no transparency support - the background is always a solid color.
• Watch out for: blocky 'artifacts' and fuzzy halos around sharp edges when you compress too hard or push the quality slider too low.

Because JPG has no transparency and struggles with sharp lines and flat color, it is a poor choice for logos, icons, screenshots, or any image containing text.

PNG: best for graphics, logos, and transparency

PNG uses lossless compression, so it preserves every pixel exactly - nothing is discarded, and re-saving never degrades the image. It also supports an alpha channel, which means parts of the image can be fully or partly transparent. That combination makes PNG ideal for logos that sit on a colored background, icons, app screenshots, and any image with sharp text or fine lines that must stay crisp.

• Compression: lossless. Pixel-perfect, no quality loss on re-save.
• Strength: transparency (alpha) and razor-sharp edges, text, and flat color.
• Weakness: files are usually much larger than JPG for the same photograph.
• Best for: logos, icons, screenshots, diagrams, and graphics with hard edges.

The downside is size. A detailed photo saved as PNG can be several times larger than the same photo as JPG, which is why PNG is the wrong tool for a page full of photographs.

WebP: the modern all-rounder

WebP is a format developed by Google that aims to replace both JPG and PNG. It is unusual because it supports a lossy mode (like JPG) and a lossless mode (like PNG) in the same format. It also handles transparency and even animation. At comparable visual quality, WebP files are typically around 25 to 35 percent smaller than the equivalent JPG or PNG, which can meaningfully speed up a web page.

• Compression: both lossy and lossless modes available.
• Strength: smaller files than JPG or PNG at similar quality, plus transparency and animation.
• Support: now works in all major modern browsers.
• Use it when: page speed matters and your audience is on up-to-date browsers.

As a worked example, imagine a product photo that is 850 KB as a high-quality JPG. The same image saved as WebP at comparable quality might land around 550 to 640 KB - roughly a quarter to a third smaller - with no obvious difference to the eye. Across a whole gallery of images, those savings add up fast.

A quick word on GIF

GIF is an older format still seen mainly for short looping animations. It is limited to a palette of just 256 colors, so it handles photographs poorly and produces large files for what it offers. For animation, WebP (or a short video file) is smaller and far better quality, and for everything else PNG or JPG is the better choice. In short, GIF has largely been superseded.

Which format should you use?

You can decide in seconds by asking two questions: is it a photograph, and does it need a transparent background?

• Photographs with no transparency: use JPG, or WebP for smaller files.
• Graphics, logos, icons, or anything needing transparency: use PNG, or WebP.
• Smallest possible files on modern browsers: use WebP.
• Maximum compatibility (email, old software, anywhere): stick with JPG or PNG.

When in doubt, JPG for photos and PNG for graphics is a safe default that works everywhere; switch to WebP once you have confirmed page speed is a priority. You can try any of these conversions in the Image Converter and compare the resulting file sizes yourself.

Converting between formats

Switching formats is easy, but two facts matter. First, converting an image to JPG removes any transparency - the see-through areas get filled in, usually with white - so a logo that looked clean on a colored background will suddenly have a white box around it. If you need transparency, convert to PNG or WebP instead. Second, converting a JPG that has already lost detail into a lossless format like PNG does not bring that detail back; the PNG simply preserves the already-degraded image at a larger size. Lossless conversion protects quality from here on, but it cannot recover what was thrown away earlier.

1. Open the Image Converter and upload your file.
2. Pick the target format based on the decision list above.
3. Download the result and compare the file size and how it looks against the original.

If your goal is purely a smaller file rather than a different format, reach for the Image Compressor, and use the Image Resizer when the dimensions are the problem.

The bottom line

There is no single best image format - only the right format for the job. JPG keeps photos small, PNG keeps graphics sharp and supports transparency, and WebP offers smaller files than both at similar quality on modern browsers. Match the format to the content, keep an original copy before any lossy conversion, and when you are ready to switch, run it through the Image Converter to get the format and file size you need.