PNG to WebP
Make a WebP copy of a PNG for a website or app that accepts WebP. Compare the output size and visible detail before replacing the original, especially for logos, screenshots and small text.
Before you start
- Input
- One static PNG image.
- Output
- A static WebP image with quality-controlled encoding.
Loading tool…
Results from our original samples: PNG to WebP
Compare the inputs, settings and downloaded outputs below. These observations apply to these samples and the recorded browser, not every file.
sample-transparent.png → quality-60.webp
Settings: Quality: 60
| Sample input | PNG · 400 × 240 px · 384,936 bytes Download input |
|---|---|
| Sample output | WEBP · 400 × 240 px · 1,952 bytes Download output |
Compare small text and transparent edges; encoding can change visible detail.
sample-transparent.png → quality-90.webp
Settings: Quality: 90
| Sample input | PNG · 400 × 240 px · 384,936 bytes Download input |
|---|---|
| Sample output | WEBP · 400 × 240 px · 2,602 bytes Download output |
Compare small text and transparent edges; encoding can change visible detail.
Keep your original. File sizes, appearance and processing limits can vary with your input and browser. Recorded: 2026-10-24 · Browser: Chromium 155.0.4283.62
How to use this tool
- Choose a static PNG image.
- Adjust WebP quality and inspect the preview.
- Compare the downloaded size and image detail, then save the WebP.
Understand the result
WebP supports transparency and can be useful for website graphics. This tool uses the browser’s quality-controlled encoder; it does not offer a verified lossless mode. A conversion is useful only when the output meets your quality and compatibility needs.
Convert PNG to WebP for a website
Choose a static PNG, set quality and compare the output with your original. Small lettering, gradients and transparent edges can reveal changes. The example outputs show two quality settings so you can inspect the trade-off before using your own image.
Decide whether to keep the original PNG
Use WebP when your destination supports it and the actual result gives a useful saving at an acceptable quality. Keep PNG when exact decoded pixels matter or the converted image is unsuitable. Resizing changes dimensions and is a separate operation.
If the result is not what you expected
Small text or edges look different.
Increase quality and compare the preview with the source. If exact pixels matter, keep the original PNG instead of accepting a lossy conversion.
Next useful tool: Image Compressor →Important limits
- Static PNG only; animation is not preserved.
- Requires a browser that can encode WebP.
- A smaller file and unchanged image detail are not guaranteed.
- One image up to 20 MiB and 25 million pixels.
Frequently asked questions
Is PNG to WebP conversion lossless here?
No verified lossless mode is offered. The quality control can change colors and detail, even when transparency is retained. Keep your source PNG.
Will WebP always be smaller?
No. Compare actual bytes and appearance. Different pictures and browsers can produce different results at the same quality setting.
What if the website rejects WebP?
Use a format the destination accepts. Changing the filename extension does not convert an image; choose the corresponding converter or keep the original PNG.
Related guides
Questions or a correction? mrkcal@mrkcal.com