PNG vs WebP: Which Image Format Should You Use?

PNG and WebP both support transparency and both give you lossless quality, so it's easy to assume WebP simply wins on every count. That's not quite true. Here's an honest breakdown of what each format is actually good at, so you can pick the right one for the job rather than following a blanket rule.

PNG: the reliable universal format

PNG is lossless — it never throws away pixel data — and it's supported absolutely everywhere: every browser, every image editor, every operating system, every print workflow going back decades. It handles transparency well and renders sharp text and hard edges perfectly. The cost is file size: PNG files are typically larger than an equivalent WebP, especially for photographic content.

WebP: smaller files, modern support

WebP was built to solve PNG's size problem. It supports both lossless mode (similar quality to PNG, notably smaller files) and lossy mode (much smaller again, ideal for photos), plus full transparency in both modes. Browser support today is excellent — all major modern browsers display WebP natively. The rough edges show up in older or more specialised software: some legacy image editors, certain print pipelines, and older versions of some operating systems don't handle WebP well, or at all.

Head-to-head

• File size — WebP wins, often 25-50% smaller than PNG at equivalent visual quality.
• Transparency — tie. Both support a full alpha channel.
• Universal compatibility — PNG wins. It works everywhere without exception, including older software and print workflows.
• Browser support (modern web) — WebP wins comfortably; every current major browser renders it natively.
• Lossless option — both offer it, but PNG has been the lossless default for longer and is what most editing software exports natively.
• Editing software / print pipelines — PNG wins for anything going into a design tool, a print shop, or an older workflow that may not recognise WebP.

A decision framework, not a rule

1. Building a website and want fast page loads? Use WebP for photos and most graphics.
2. Sending a file to a print shop, or into software you're not sure supports WebP? Use PNG to be safe.
3. Need the image to work in absolutely any context without testing? Use PNG.
4. Optimising for page speed and your audience is on modern browsers? Use WebP.
5. Archiving a master copy you might re-edit for years? PNG's universal support makes it the safer long-term bet.

How to convert between them

If you have a PNG and want a smaller WebP for the web, or a WebP that needs to become a PNG for compatibility with an older tool, an Image Converter handles this in your browser in a couple of clicks — no need to install anything.

Tips

• When in doubt for the web, serve WebP with a PNG fallback if your platform supports it.
• Don't convert a JPEG to PNG expecting quality to improve — you can't recover detail that lossy compression already discarded.
• Check where the file is actually going (web, print, another person's editing software) before picking a format, rather than defaulting to one every time.

Common mistakes

• Assuming WebP is strictly superior and using it for a print job, where an older RIP or print pipeline may not accept it.
• Keeping PNG for a photo-heavy web page and wondering why it loads slowly — that's exactly the case WebP's lossy mode was built for.
• Not checking transparency after converting — it usually survives, but always verify in the target format.