Last tested
What does this WebP to PNG converter do?
Vaultaire converts one still WebP image into one static PNG inside a browser worker. It preserves the rendered image and transparency, removes source metadata, then checks the completed PNG before download.
The selected image is not sent to a conversion API. Cloudflare serves the page and its static code, but the file bytes stay in the browser. The tool stops if the browser cannot prove the output contract locally.
What changes when WebP becomes PNG?
WebP and PNG use different compression. Conversion can make an image easier to open in another app, but it cannot restore detail already lost in a lossy WebP.
| Property | WebP input | PNG output |
|---|---|---|
| Visible image | Browser-rendered sRGB image | Compared pixel by pixel before download |
| Transparency | Full or partial alpha when present | Preserved and checked |
| Animation | Detected before decode | Animated input is rejected, not flattened |
| Metadata | EXIF, XMP, ICC, or C2PA may be present | Source records are not copied |
| Color | Browser-managed source rendering | Canonical 8-bit sRGB declarations |
| File size | Often smaller | Often larger, especially from lossy WebP |
The official WebP container specification defines still images, animation, alpha, and metadata chunks. The PNG specification defines the output chunks, checksums, color declarations, and alpha representation checked here.
How do I convert WebP to PNG without uploading it?
- Choose a WebP. Select one still WebP image. The browser checks its signature and container before decode.
- Review the file. See the dimensions, encoding, transparency declaration, orientation, and source metadata.
- Convert and verify. Create the PNG locally, review the receipt, then download the verified copy.
Still WebP only. Up to 20 MB, 4096 pixels on either side, and 16,000,000 total pixels.
WebP to PNG FAQ
How do I convert WebP to PNG?
Choose a still WebP, review the file details, then select Convert to PNG. The browser creates and verifies a separate PNG. Your original WebP is not changed.
Does converting WebP to PNG reduce image quality?
The tool does not add another lossy compression step. It preserves the browser-rendered image in PNG, but it cannot restore detail that the original WebP already lost.
Does WebP to PNG preserve transparency?
Yes, for supported still WebP images. Full and partial alpha values are compared against the rendered source before the PNG download is enabled.
Is my WebP uploaded?
No. The selected file is read, converted, and verified in a browser worker. PostHog receives tool-use events, but never image bytes, file names, dimensions, metadata, or output details.
Why is the PNG larger than the WebP?
PNG and WebP use different compression. A PNG made from a lossy WebP often stores many more bytes even though it cannot add missing detail.
Does conversion remove WebP metadata?
Yes. Source EXIF, XMP, ICC, C2PA, text, time, and unknown ancillary records are not copied. The PNG keeps only image data and canonical sRGB declarations.
Can it convert animated WebP to PNG?
No. Animated WebP is rejected before decode because one static PNG would discard frames. The tool does not silently export the first frame.
Does it work on iPhone and Android?
It works only when the browser exposes the local decode, canvas, worker, and PNG APIs needed for verification. The page checks those APIs and fails locally instead of uploading the image as a fallback.
Can I convert several WebP files at once?
Not in this release. One-file conversion keeps the memory limit, cancellation, output name, and verification result clear.
Is WebP to PNG lossless?
The PNG encoding is lossless from the browser-rendered WebP pixels. If the source WebP used lossy compression, converting it cannot reverse that earlier loss.