Is WebP lossless like PNG?

WebP supports both lossy and lossless modes. This tool uses a very high quality setting that keeps full transparency and is visually indistinguishable from PNG for logos and UI.

Will my PNG's transparent background stay transparent?

Yes. WebP has a full 8-bit alpha channel, so transparent and semi-transparent pixels are preserved exactly.

How much smaller will the WebP be?

For UI graphics and logos expect a 60–80% reduction. For photographic PNGs the saving is around 25–35% at equal visible quality.

Where can I use WebP?

Every modern browser, WordPress 5.8+, Discord, Slack, Figma, Notion and every major CDN. Only very old software (IE, Safari 13, Word 2016) can't read it.

Does WebP work as a favicon?

Modern browsers accept WebP favicons, but for widest compatibility include a legacy ICO or PNG fallback in your chain.

Is WebP better than AVIF?

AVIF typically wins on file size by another 10–20% but has slower encode/decode and less mature tooling. WebP is the safer default in 2026.

Do search engines index WebP?

Yes — Google, Bing and DuckDuckGo all index WebP and prefer it in Core Web Vitals audits.

Can I re-open the WebP in Photoshop?

Photoshop 23.2+ (February 2022) opens WebP natively. For older versions install the WebPShop plugin.

Convert PNG to WebP

WebP supports the same lossless transparency as PNG but with much better compression. Logos, icons, and UI screenshots that were 500 KB as PNG often drop under 100 KB as WebP — with pixel-identical output.

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Running locally

To convert PNG to WebP, drop a PNG above and download the WebP result. WebP preserves the PNG's alpha channel exactly and typically shrinks lossless-style images by 60–80%. That means a 500 KB PNG logo often becomes an 80–120 KB WebP with pixel-identical rendering. Everything runs locally on canvas.toBlob('image/webp', 0.9); the file is never uploaded. This is the single highest-value conversion for web performance, because PNG is routinely used for screenshots, logos and UI graphics where its file sizes are large and WebP's advantage is greatest. The caveat is that WebP at quality 0.9 is lossy rather than lossless, which is imperceptible on photographic content but can soften very fine text in a screenshot. Where exact fidelity matters, WebP also has a genuinely lossless mode that still beats PNG by roughly 20 to 30 percent. Email clients and older design software remain the compatibility gap.

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Output: WebP

What happens when you convert PNG to WebP?

WebP has two modes: lossy VP8 for photographs and a purpose-built lossless coder for flat graphics. The lossless variant supports the same 8-bit alpha as PNG and is what browsers use when they see a fully opaque or partially transparent asset compressed with WebP-Lossless. Because canvas.toBlob('image/webp') accepts a quality parameter, WebP at 100 is close to lossless behaviour but not identical to true WebP-Lossless; for pixel-perfect logos verify visually after conversion. WebP is supported by all evergreen browsers, WordPress core, Cloudflare Images, Vercel, Netlify and every major CDN.

Common mistakes and limitations when going from PNG to WebP

WebP is not a superset of PNG in every situation: extreme edge cases like large 16-bit-per-channel PNGs or PNG APNG animations cannot be represented one-to-one, and some legacy image tools (older Photoshop plugins, Word 2019 and earlier) refuse WebP uploads. If your build pipeline generates PNG sprites for pixel-perfect icons, run a visual diff after conversion — the alpha edges can shift by one gray value on some GPUs. For universal compatibility keep the PNG alongside the WebP and serve WebP via a <picture> tag.

Choosing the right settings for PNG to WebP

This conversion has two distinct modes and choosing wrongly is the main pitfall. Lossless WebP preserves every pixel exactly, like the source PNG, and typically lands 20 to 30 percent smaller — pure gain with no visual change, and the right choice for screenshots, logos, diagrams and anything with text. Lossy WebP compresses far harder but introduces artefacts around the sharp edges that PNG content usually contains. For photographic PNGs — images that were saved as PNG but are really photographs — lossy WebP at quality 80 is dramatically smaller and visually fine. For interface screenshots and line art, use lossless. Transparency survives either way, which is the significant advantage over converting to JPG. WebP supports a full 8-bit alpha channel in both lossy and lossless modes, so a logo with a soft shadow converts cleanly and stays usable on any background. The thing to verify afterwards is the alpha edge. Lossy WebP can introduce faint fringing along a semi-transparent boundary, most visible when the image is placed on a background very different in tone from the one it was designed against. View the converted file over both a light and a dark background before shipping it. One workflow detail that catches people out is that lossless WebP is not always smaller than the source PNG. If the PNG was already run through an optimiser such as pngquant or oxipng, much of the easy saving has been taken and WebP may only match it or come out marginally larger. Compare the two before replacing the original, and keep whichever is smaller rather than assuming the newer format automatically wins on every file you feed it.

Questions8

PNG to WebP conversion FAQ

Is WebP lossless like PNG?: WebP supports both lossy and lossless modes. This tool uses a very high quality setting that keeps full transparency and is visually indistinguishable from PNG for logos and UI.
Will my PNG's transparent background stay transparent?: Yes. WebP has a full 8-bit alpha channel, so transparent and semi-transparent pixels are preserved exactly.
How much smaller will the WebP be?: For UI graphics and logos expect a 60–80% reduction. For photographic PNGs the saving is around 25–35% at equal visible quality.
Where can I use WebP?: Every modern browser, WordPress 5.8+, Discord, Slack, Figma, Notion and every major CDN. Only very old software (IE, Safari 13, Word 2016) can't read it.
Does WebP work as a favicon?: Modern browsers accept WebP favicons, but for widest compatibility include a legacy ICO or PNG fallback in your <link rel='icon'> chain.
Is WebP better than AVIF?: AVIF typically wins on file size by another 10–20% but has slower encode/decode and less mature tooling. WebP is the safer default in 2026.
Do search engines index WebP?: Yes — Google, Bing and DuckDuckGo all index WebP and prefer it in Core Web Vitals audits.
Can I re-open the WebP in Photoshop?: Photoshop 23.2+ (February 2022) opens WebP natively. For older versions install the WebPShop plugin.

PNG vs WebP at a glance

Property	PNG source	WebP output
Compression	Lossless DEFLATE	Lossy VP8 or lossless WebP-L
Alpha channel	8-bit	8-bit (preserved)
Typical logo/UI size	300–800 KB	60–200 KB
Animation	No (APNG rare)	Yes
Best used for	Editing masters	Web-facing logos and UI