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

By the CompressPicOnline team · Updated October 19, 2026 · All guides

Choosing the wrong image format can make a website slower, a logo look fuzzy or an email attachment huge. JPG, PNG and WebP are the three formats you will meet most often, and each is built for a different job. This guide compares them in plain language so you can pick the right one every time.

JPG (JPEG): the photo format

JPG uses lossy compression, which means it permanently discards detail the human eye barely notices. This makes it excellent for photographs, where colours blend smoothly. A well-compressed JPG can be ten times smaller than the original uncompressed image. Its weaknesses are that it does not support transparency and that sharp edges and text can show blurry halos at low quality. Every device, website and program can open JPG.

PNG: the sharp graphics format

PNG uses lossless compression, so no detail is lost, and it supports transparent backgrounds. That makes it ideal for logos, icons, screenshots with text and diagrams. The downside is size: a photograph saved as PNG can be five to ten times larger than the same photo as a JPG. PNG is also universally supported.

WebP: the modern all-rounder

WebP was created to replace both of the older formats. It can use lossy or lossless compression, supports transparency and can even store animation. In most tests, lossy WebP is noticeably smaller than JPG at similar visual quality, and lossless WebP is smaller than PNG. All current major browsers support it. The remaining downsides are that some older software, print services and upload forms still refuse WebP files.

Quick comparison

Photos: WebP is smallest, JPG is the safest, PNG is the heaviest.
Logos and icons: PNG or SVG, with WebP as a lighter alternative.
Transparency: PNG and WebP support it, JPG does not.
Compatibility: JPG and PNG work everywhere, WebP works in modern browsers and apps.
Animation: WebP and GIF support it, JPG and PNG do not.

Which format for which situation

Websites and blogs: use WebP or JPG for photos, PNG for graphics that need transparency. Smaller images improve loading speed, which supports better search performance.

Online forms and portals: use JPG. It is the format almost every upload form accepts, and it compresses well to strict KB limits.

Email and messaging: use JPG so the recipient can open it on any device.

Printing: use JPG at high quality or an uncompressed format your print shop requests. Avoid heavy compression.

Screenshots and documents: PNG keeps text crisp. If the file is too large, high-quality JPG at 85% to 90% is a good compromise.

How to convert between formats

Open the image compressor and select your PNG, WebP or HEIC files.
Pick a quality level and press compress.
Each file is converted to a compact JPG, with transparent areas filled in white.
Download them individually or as a ZIP.

Because conversion to JPG removes transparency, keep your original PNG if you will need the transparent version later.

Common mistakes

Saving photographs as PNG and wondering why the site is slow.
Saving logos as low-quality JPG and getting fuzzy edges.
Converting a JPG to PNG and expecting better quality. It cannot restore lost detail; it only makes the file bigger.
Editing and re-saving a JPG many times, which adds damage every time.

What about quality settings?

For lossy formats, quality around 80% to 85% is the sweet spot for web use. Below 60%, artefacts become visible on most images. Above 92%, file size grows quickly with almost no visible improvement.

A practical decision rule

If you are unsure, follow this rule. Is it a photograph? Use JPG, or WebP when you control the website. Does it need a transparent background or razor-sharp text? Use PNG. Is it an icon or simple logo for a website? Prefer SVG if you can. Is it going into an email, form or chat? Use JPG, because the recipient's software will certainly open it. Following this rule covers about nine out of ten cases, and the compressor on this site helps you shrink whichever format you end up with before you publish or send it.

Frequently asked questions

Is WebP always better than JPG?

For file size on the web, usually yes. For compatibility with forms, older software and print shops, JPG is still safer.

Does PNG have better quality than JPG?

PNG preserves every pixel, so it is more exact, but for photographs the visible difference is small and the file is much larger.

Which format is best for SEO?

The one that gives the smallest file at acceptable quality, usually WebP or compressed JPG, together with descriptive file names and alt text.

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