WebP to PNG Converter

About the WebP to PNG Converter

Convert WebP images to PNG with every pixel kept exactly, including transparency. Files are decoded with libwebp, the reference WebP decoder (compiled to WebAssembly and run in your browser), straight to the PNG — not through a browser canvas, which rounds the colours of partly transparent pixels. Soft shadows, anti-aliased edges and invisible colour values under transparent areas come out exactly as they are in the WebP.

Animated WebP files are handled too: export one chosen frame, or every frame as numbered PNGs in a ZIP. For logos, icons and screenshots you can also save an 8-bit palette PNG (up to 256 colours), which is often much smaller. Nothing is uploaded, and the page works offline once loaded.

Common uses

• Editing WebP images in software that opens PNG but not WebP.
• Keeping transparent stickers, logos and UI assets transparent (JPG would add a background).
• Extracting frames from animated WebP stickers, memes or loading spinners for editing or thumbnails.
• Producing compact palette PNGs of icons and diagrams for documentation.

Is WebP to PNG really lossless?

Yes: PNG is a lossless format (W3C PNG Specification), and every pixel the WebP decodes to — red, green, blue and alpha — is stored in the PNG unchanged. If the WebP was lossy, the PNG contains exactly what that lossy WebP shows, including any compression artefacts; converting cannot add back detail that was removed when the WebP was made. From this point on, editing and re-saving the PNG adds no further loss.

PNG files are written with MySmartCoPilot’s optimising encoder, which picks the smallest exact layout (palette, greyscale or RGB, with or without alpha) for each image.

Animated WebP: one frame or every frame

An animated WebP stores frames that may cover only part of the picture and are drawn over the previous ones (RFC 9649 defines each frame’s position, whether it is blended or replaces what is below, and whether it is cleared afterwards). This converter builds every frame the way libwebp’s reference animation decoder does, so each PNG is the complete picture as shown at that moment — not a fragment. Every frame exports up to 2,000 frames per file, numbered in order.

When to choose an 8-bit palette PNG

• Logos, icons, flat illustrations, charts and screenshots usually have few colours. A palette PNG stores each pixel as one byte (or less), which can make the file several times smaller. With 256 colours or fewer, the result is still exact.
• Photos and gradients have thousands of colours; reducing them to 256 can cause banding. Dithering (on by default) hides most of it, but lossless PNG — or keeping the WebP — is the better choice for photos.

Colour profiles

If the WebP contains an embedded colour profile (for example Display P3 from a phone or design app), it is copied into the PNG, so colour-managed apps show the same colours. Without a profile, both files are treated as standard sRGB.

Limitations

• Up to 100 files per batch, each up to 200 MB and 50 megapixels; up to 2,000 frames per animated file in “Every frame”.
• Frames are exported as separate PNG files; the animation itself (timing, looping) is not kept in PNG.
• EXIF and XMP metadata are not copied; an ICC colour profile is.
• Very large or long animations need a lot of memory and time, because each frame is decoded and written separately.

Privacy

Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot.