Guide · Updated Oct 2026

WebP vs PNG: Which Image Format Should You Use?

The webp vs png question isn't really a specs debate. It's a delivery decision. Pick wrong and your pages load slower than they need to; pick right and it's the easiest performance win on your site. Most comparisons drown you in codec trivia. This one won't — here's what each format is actually for, where each one wins, and the workflow that lets you stop choosing.

WebP vs PNG: the 60-second comparison

Sources: compression figures from Google's WebP documentation (developers.google.com/speed/webp, checked 2026-10-06); max dimensions from Google's WebP FAQ (checked 2026-10-06); in-browser encoding support from getsnapshrink.com/webp-converter/ (checked 2026-10-06).

Two things the table doesn't show: WebP is the newer format (Google, 2010), so its only real weakness is compatibility, not capability. PNG's only real weakness is file size. Everything below follows from that.

When WebP wins

Anything served on a website. This is the core case. At similar visual quality, WebP files are roughly a quarter smaller than their PNG equivalents (Google's lossless figure is 26%), and the savings compound across every image on the page. On image-heavy pages — galleries, product listings, blog archives — that's the difference between a page that feels instant and one that doesn't, especially on mobile data. File weight feeds directly into Core Web Vitals like LCP, which is one more reason to care.

Transparency without the PNG tax. PNG's alpha channel is great and WebP matches it — including in lossy mode, which JPEG can't do at all. A transparent logo or UI element as WebP is typically much smaller than the same PNG with no visible difference.

Photo-heavy pages. Lossy WebP at a sensible quality setting beats PNG by a wide margin on photographs, where PNG's lossless compression is the wrong tool entirely. (If your photos are currently PNGs, switching them to WebP is usually the single biggest image win available.)

Replacing simple GIFs. WebP supports animation with far better compression than GIF. One honest caveat about tooling here: SnapShrink treats GIF inputs as stills — it converts the first frame rather than the animation — so if you need animated output, use a dedicated GIF-to-WebP tool, not a batch compressor.

When PNG still wins

An honest comparison has to say this plainly: there are jobs where PNG is still the right answer, and converting everything to WebP would be a mistake.

Editing masters. Keep your originals as PNG (or whatever lossless source you have). Every conversion is a generation of change; you want the master to be the highest-fidelity version. Convert copies for delivery, never the only copy you have.

Print and brand-kit delivery. Print workflows, design tools, and brand kits expect PNG (or TIFF/PDF). Nobody wants a .webp in a logo package. Deliver what the recipient's toolchain accepts.

Legacy systems and email clients. Older email clients, some CMS plugins, and partner systems that ingest images may reject WebP outright. When someone else's system is in the loop, PNG is the safe format. SnapShrink can output JPEG or PNG from the same tool when you need the compatible fallback.

Deep color. PNG supports up to 16 bits per channel. If you're working with high-bit-depth sources, PNG preserves what WebP's 8-bit channels can't.

Enormous images. WebP tops out at 16,383 × 16,383 pixels. If you're dealing with poster-size or survey imagery above that, PNG (effectively unlimited) is the format.

None of this is an argument against WebP for web delivery. It's an argument for keeping both formats in your life, each doing its job.

The practical workflow: keep PNG masters, serve WebP

The people who do this well don't convert files one at a time in a panic before launch. They run a simple pipeline:

1. Keep masters in a private folder. Originals stay PNG, untouched, in a folder that never gets uploaded anywhere. This is your source of truth.
2. Convert a representative sample first. Pick 3–5 images that cover your range — a photo, a screenshot with text, a transparent graphic — and convert those. Compare each against the original side by side at real display size.
3. Lock the settings. Once the sample looks right, those quality settings apply to the whole folder. No per-image fiddling.
4. Batch-convert the folder. Select everything, convert in one pass, download the batch as a ZIP. Name files consistently before you convert so the ZIP drops straight into your theme or CMS image directory without renaming.
5. Ship WebP, keep PNG. The site serves .webp; the private folder keeps .png. When you need to re-edit, you go back to the master, not the compressed copy.

This is also where the metadata question comes up: re-encoding an image typically drops EXIF data (camera settings, and sometimes location) along the way. If you publish photos, that's worth understanding on its own — there's a full walkthrough of what image metadata gives away and how to strip it.

Should I use WebP or PNG on a website?

Short version: WebP for everything the browser displays, PNG for everything else. If you searched "should i use webp or png" or "webp vs png for website," that sentence is the whole answer — but the edge cases are where people get burned, so here they are.

Use WebP for hero images, thumbnails, blog media, product photos, and any image where file weight affects load time. If a destination supports WebP — modern browsers, most CDNs, most static site generators — it's the strong default.

Keep PNG for the five cases in the previous section. The most common real-world mistake isn't choosing WebP; it's converting the only copy and deleting the master, or shipping WebP into a system that can't read it (hello, email newsletters).

For logos specifically: serve WebP on the site, keep PNG in the brand kit. The transparent-logo case is where WebP's savings are most dramatic, and it's also where a PNG fallback matters most for compatibility.

And if you're wondering "webp vs png which is better" in the abstract — neither. They're tools. The better question is always "better for what?"

Convert without uploading — and prove it

Here's where most "PNG to WebP" converters get shady: you upload your files to their server, their encoder does the work, you download the result. Even with a deletion promise, you've created a copy of your images on someone else's disk.

SnapShrink works the other way. The File API reads your images inside the browser tab, a Web Worker encodes them locally, and you download the result — the bytes never leave your machine. You don't have to take that on faith: open DevTools, switch to the Network tab, run a batch, and watch for uploads. There won't be any. (This is documented on the WebP converter page itself, which is the right place to be skeptical of marketing copy — including this post.)

The practical version, using the free WebP converter:

1. Open the image compressor tool — no account, no install.
2. Set the output format to WebP.
3. Drop your PNGs (or JPGs) onto the drop zone — one file or a whole folder.
4. Optionally set a Target KB value if a portal demands a hard size cap; the tool searches for the quality setting that fits, so you can convert to WebP and hit "under 100KB" in one pass.
5. Download files individually or grab the whole batch as a ZIP.

The first 10 images per session are free. And because the encoding happens in a Web Worker, the tab stays responsive while a big batch churns through.

One more thing worth knowing: converting to WebP is also a quality-control moment. If you're unsure how aggressive to be with the quality slider, the guide to compressing without losing quality walks through what to look at before you commit to settings for a whole folder.

Frequently asked questions

Nawal Shrestha — founder of SnapShrink, building privacy-first browser tools.