Convert PNG to WebP online

To convert PNG to WebP, upload the PNG file, start the conversion and download the result: Converter.now writes a WebP at quality 90. Transparency is kept. WebP is a lossy format, so the file is usually much smaller but some fine detail is discarded; keep your PNG original.

◈ Encrypted transfer◷ Short retention⊘ No watermark◎ Works on every device

PNG to WebP at a glance

Converts: Portable Network Graphics → WebP image
Output: A WebP at quality 90
Compression: PNG: lossless → WebP: lossy
Engine: Pillow (with ImageMagick fallback)
Privacy: Private download link; files are deleted after 6 hours. No account needed.

Pixel decoding and image re-encoding: How PNG becomes WebP

Converter.now decodes losslessly encoded pixels with full alpha transparency into a working pixel canvas, then writes that canvas according to WebP's color and compression model. Dimensions may stay constant while encoding, metadata, and fine detail change. PNG decoding combines filtered scanlines with declared color type, bit depth, palette or full alpha, color-profile chunks, and optional ancillary metadata. Because WebP can be lossy, lossless, transparent, or animated, confirm explicitly which mode was actually chosen, along with the oldest supported browser, edge quality, frames, color, and metadata.

Decoded canvas - Losslessly encoded pixels with full alpha transparency. Written image - A modern web image supporting lossy or lossless pixels, alpha, and animation.

Not quite the pair you need? Browse more ways to convert PNG files or the WebP converter hub for every route into and out of WebP.

Before converting a whole batch, read choosing between JPG, PNG, WebP and AVIF; it explains how transparency, detail and browser support decide the format.

PNG

Portable Network Graphics

Used for lossless images and transparency.

Family: Images
MIME: image/png

→

WebP

WebP image

Designed for efficient modern web graphics.

Family: Images
MIME: image/webp

The delivery decision for this PNG to WebP route

Choose WebP when its particular balance of compatibility, alpha, animation, and file size matches the destination better than PNG.

What changes between the PNG model and the WebP deliverable

Transparency is kept.
WebP is a lossy format, so the file is usually much smaller but some fine detail is discarded; keep your PNG original.
Metadata handling differs between PNG and WebP; do not assume every application-specific field carries across untouched.

What the PNG source carries and the WebP output demands

What can fail when Portable Network Graphics is interpreted

PNG is inefficient for many photographs, and indexed optimization can reduce a smooth palette even without JPEG-style loss.

What WebP image cannot safely promise

Legacy software may not open WebP, and lossy settings can blur texture or transparent edges.

How the WebP writer handles this route

a modern web image supporting lossy or lossless pixels, alpha, and animation is what gets written, labeled as image/webp. Whether that actually opens depends on the receiving application, not on the file extension.

How to confirm the converted WebP actually works

Record the PNG evidence before conversion

Inspect transparent edges, gradients, exact dimensions, color, and small text at 100%.

Test the WebP file in its receiving workflow

Check the encoding mode, animation frames, transparency, gradients, and oldest required browser.