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

Three formats cover almost every image you will ever save, send or publish: PNG, JPG and WebP. Each compresses pictures in a different way, each has a distinct strength, and picking the wrong one usually means a file that is larger than it needs to be or a detail you did not want to lose. This guide explains how each format works and gives you a simple way to decide.

The 30-Second Answer

• A photograph being shared or uploaded — use JPG, or WebP when the receiving site accepts it.
• A screenshot, logo, diagram or anything with sharp edges or transparency — use PNG, or lossless WebP.
• Images you publish on the web and control yourself — use WebP for the best size-to-quality balance, with PNG or JPG as fallback where needed.
• Maximum compatibility above all — use PNG or JPG, which just about any browser or application can open.

The rest of this guide explains where those rules come from, so you can make the call confidently in situations they do not cover.

PNG: Lossless and Dependable

PNG compresses without discarding anything. The compression is lossless, meaning every pixel that goes in comes back out exactly the same — like zipping a file rather than summarizing it. PNG also supports full alpha transparency, so parts of the image can be genuinely see-through rather than filled with a background color. Those two properties make PNG the default choice for screenshots, logos, interface graphics, charts and any image containing text or hard edges, where even small compression errors are visible as smudges. It has been around since 1996 and is supported everywhere.

The cost is size. Lossless compression cannot do much with the visual noise in a photograph — the tiny variations that make a photo look like a photo defeat the pattern-finding that lossless methods rely on. A photo saved as PNG can easily be several times larger than the same photo saved as JPG at good quality. If your image has no transparency and no hard edges, PNG is usually paying for a guarantee you do not need.

JPG: The Universal Photo Format

JPG compression is lossy: it permanently discards information that the algorithm predicts your eye will miss, which makes photographs dramatically smaller. That design goal is why JPG conquered the world — it is accepted by every upload form, every social network, every device and every browser, and it remains the safe default for photos.

Two limitations matter. First, JPG has no transparency: any transparent area must be flattened onto a solid color (white, in most workflows — our converter lays a white background under transparency when producing JPG for exactly this reason). Second, lossy compression leaves artifacts: faint blocky noise around sharp edges, most visible on text, flat colors and hard boundaries. Photos tolerate this well; graphics usually do not.

When saving JPG, the quality slider controls the trade-off. A setting in the mid-80s to low-90s suits most photographs; pushing toward 100 multiplies file size for gains you can rarely see, while dropping far below that starts to show visible smearing around details.

WebP: The Modern Middle Ground

WebP, developed by Google and in use across the web since roughly 2010, does both jobs. It has a lossy mode and a lossless mode, and both support alpha transparency — a combination neither PNG nor JPG offers on its own. At comparable visual quality, lossy WebP files are typically smaller than JPGs, and lossless WebP files are smaller than PNGs, which is why performance-conscious sites favor it.

Browser support is now broad: all major modern browsers — Chrome, Edge, Firefox, Safari and their mobile versions — render WebP. The honest caveat is the edges of that support: a handful of older or niche browsers, and some desktop image applications and CMS pipelines, still cannot decode it. If you control the website, WebP is a safe default today; if a file must open anywhere, on anything, PNG or JPG remain the dependable answers. One related note: a browser that can display WebP may still be unable to encode it — our converter checks this and tells you plainly instead of producing a broken file.

How Compression Actually Changes Your Image

Lossy compression works by throwing away detail: subtle color variations, fine texture, faint edges. At sensible settings the discarded information is genuinely hard to notice, but it is gone. No converter, upsampler or “enhancer” can restore it, because the information no longer exists in the file — only the pixels that survived the compression do.

This has two practical consequences. First, keep your original file as the master copy. Every lossy save re-compresses the image, and repeated rounds of saving accumulate artifacts the way photocopies accumulate blur. Convert from the master, not from an already-compressed copy. Second, treat the quality slider as a one-way dial: each step down produces a smaller file and slightly more loss, so it is worth comparing the result at a couple of settings rather than defaulting to the minimum size.

Comparison Table

A Simple Decision Guide

1. Is it a photograph? Save as JPG — or WebP if the destination accepts it.
2. Does it have transparency, text, hard edges or flat colors? Save as PNG.
3. Publishing to the web and you control the pipeline? Use WebP, with PNG or JPG available as fallback.
4. Unsure what an upload form accepts? JPG for photos, PNG for everything else — those two are almost never refused.
5. Whatever you choose, keep the original file untouched as your master for future conversions.

When you need to move a file between these formats, you can convert PNG, JPG and WebP right in your browser — no uploads, no signup, and your images never leave your device.