JPEG vs PNG vs WebP: Which Format Should You Use?

Three image formats dominate the web: JPEG, PNG, and WebP. Each was designed with different priorities, and picking the wrong one for a given image either wastes file size or produces visibly worse quality than necessary. Here's how they actually differ, and a straightforward way to decide between them.

JPEG: The Photography Format

JPEG (Joint Photographic Experts Group) has been the default photo format since the early 1990s, and for good reason: it was specifically designed around how photographic images compress well under lossy algorithms. JPEG works by transforming image data into frequency information and discarding the frequencies least perceptible to human vision, which is highly effective for images with smooth gradients and natural detail.

Strengths:

• Excellent compression ratios for photographic content
• Universally supported, every browser, device, and image tool handles JPEG
• Adjustable quality lets you trade file size against visual fidelity

Weaknesses:

• No transparency support, JPEG images are always fully opaque
• No animation support
• Performs poorly on flat-color graphics, text, and sharp edges, often producing visible ringing artifacts around hard boundaries
• Lossy only, there's no way to save a JPEG without some quality loss (though quality 100 minimizes it)

Best for: Photographs, complex real-world imagery, and any content where smooth gradients and natural detail dominate.

PNG: The Lossless, Transparent Format

PNG (Portable Network Graphics) was designed as a lossless alternative to the older GIF format, adding full 24-bit color and an alpha transparency channel. Because PNG compression is lossless, decompressing a PNG always produces pixel-perfect output identical to the source.

Strengths:

• Lossless, no quality degradation, ever, regardless of how many times you re-save it
• Full alpha transparency support (not just the on/off transparency of GIF)
• Excellent for flat colors, sharp edges, text, and line art, where it often produces smaller files than JPEG would at equivalent visual quality
• Universally supported

Weaknesses:

• Much larger file sizes than JPEG for photographic content, since lossless compression can't discard visual information the way lossy compression can
• No animation support (that's what animated GIF or APNG are for, and APNG support is inconsistent)
• No quality slider, PNG is either lossless at whatever compression level, not adjustable for size/quality trade-offs the way JPEG and WebP are

Best for: Screenshots, logos, icons, diagrams, UI graphics, and any image requiring transparency or pixel-perfect accuracy.

WebP: The Modern All-Rounder

WebP is a newer format developed by Google, designed to outperform both JPEG and PNG on their own terms. It supports both lossy compression (competing with JPEG) and lossless compression (competing with PNG), plus alpha transparency and animation, all in one format.

Strengths:

• Lossy WebP typically produces smaller files than JPEG at equivalent visual quality, often 25–35% smaller for comparable perceived quality, though the exact figure depends heavily on the specific image
• Lossless WebP typically beats PNG on file size too, while still being fully lossless
• Supports alpha transparency, like PNG
• Supports animation, unlike PNG or JPEG
• Now supported by all major modern browsers

Weaknesses:

• Slightly less universal support than JPEG/PNG in older software and some image editing tools, though this gap has narrowed significantly in recent years
• Less familiar to non-technical users, who may expect a "regular" JPEG or PNG file

Best for: Nearly everything, when broad compatibility with older tools isn't a hard requirement, WebP genuinely outperforms both JPEG and PNG on file size for most content types, at equivalent quality.

A Decision Framework

Does the image need transparency? If yes, use PNG or WebP, never JPEG, which has no transparency support at all.

Is the image a photograph or photo-like content? If yes, JPEG or lossy WebP will produce much smaller files than PNG for comparable visual quality. Prefer WebP if broad compatibility isn't a strict requirement.

Is the image flat-color graphics, text, a screenshot, or a logo? PNG or lossless WebP will typically look sharper and may even be smaller than a JPEG at a quality setting high enough to avoid visible artifacts around edges and text.

Does it need to animate? WebP supports animation; JPEG and standard PNG do not.

Is maximum compatibility with older software critical? JPEG and PNG have the longest track record of universal support. This matters less every year as WebP support has become close to universal in browsers, but it's still a consideration for some workflows (certain older content management systems or design tools).

Converting Between Formats

Because JPEG, PNG, and WebP all ultimately decode to the same kind of raw pixel data, converting between them is straightforward, the only real consideration is that converting from a lossy format (JPEG or lossy WebP) to another format doesn't recover any detail that the original lossy compression already discarded. Converting a heavily compressed JPEG to PNG produces a larger file with the same JPEG artifacts baked in, not a cleaner image. For best results, convert from the highest-quality source you have available, ideally before any lossy compression has been applied.

Try It

Our Image Compressor lets you export to JPEG, PNG, or WebP with an adjustable quality setting (where applicable), so you can compare file sizes across formats directly for your specific image. If you also need to change dimensions, our Image Resizer handles that, both run entirely in your browser.