Convert PNG to WebP Online
WebP is a great way to speed up your website. Convert PNG files locally in your browser for much smaller files at a quality level you control.
Last updated: August 2026
Drop your images here or click to select
Supports JPG, PNG, WebP and AVIF
PNG is lossless, and that is both its virtue and its cost. Every pixel is preserved exactly, which is why it is the right format for logos, screenshots and graphics — and why a PNG of a photograph can be several times larger than it needs to be for a website. Converting to WebP is how you keep the qualities that matter, particularly transparency, while paying a great deal less in bytes.
It is worth being precise about the trade, because "smaller with no loss" is a claim that gets made too easily. WebP has a lossless mode, but the conversion here encodes lossily at the quality level you choose, exactly as it would for JPEG. What you get is a much smaller file with a controlled, usually invisible amount of loss — not a byte-perfect copy. For web delivery that is the right trade almost every time. For an archival master, keep the PNG.
What survives the conversion is the thing PNG users usually care about most: transparency. WebP supports an alpha channel, so a logo with a transparent background stays transparent, unlike the same conversion to JPEG. That combination — alpha preserved, size sharply reduced — is why WebP replaced PNG for so much web interface imagery.
How to convert PNG to WebP
- 1
Add your PNGs
Drop one or a whole set. Everything is decoded and re-encoded in your browser, with no upload, so a folder of unreleased design assets stays on your machine.
- 2
Choose WebP as the output
Select it from the format options. Transparency in the source is carried through automatically — there is nothing extra to enable.
- 3
Set the quality deliberately
Around 80 percent is the usual sweet spot for web imagery. Graphics with hard edges and flat colour tolerate less compression than photographs, so check those at a higher setting before committing a whole set.
- 4
Download and compare
The size difference from PNG is usually dramatic. Look at the result at full size before rolling it out across a site, particularly for anything containing text.
Pro tip: Convert from your original PNG rather than from an already-optimised one. PNG optimisation tools reduce colour depth and strip data to shrink the file, and while that is lossless in PNG terms, it leaves the image with less information for WebP to work with — you end up compressing an already-degraded picture. Go from the source export every time, and keep the PNG as the master so you can re-encode at a different quality later without stacking losses.
Troubleshooting: If text or sharp edges look smudged, the quality setting is too low for that kind of content — graphics need a higher setting than photographs do. If transparency disappeared, the output format was JPEG rather than WebP; JPEG has no alpha channel. If the file did not get much smaller, the PNG may already have been heavily optimised, or the image may be a photograph that was small to begin with. And if something in your workflow refuses the result, Convert WebP to PNG reverses it losslessly.
For photographs already in JPEG, Convert JPG to WebP covers the same move with a different starting point. To go smaller still, Convert Image to AVIF — with the compatibility trade that implies. Optimize PNG for Faster Loading covers staying in PNG, and Online Image Optimizer for Websites the whole-site view. To reverse the conversion, Convert WebP to PNG, or use the full Convert Image tool.
Frequently asked questions
How do I convert PNG to WebP?
Add your PNG files to the tool above, choose WebP as the output format, set a quality level, and download. Transparency is preserved automatically, and the whole conversion runs in your browser without uploading anything.
Is PNG to WebP conversion lossless?
Not here. WebP does have a lossless mode, but this conversion encodes lossily at the quality you choose — which is what produces the large size saving. The loss is usually invisible at sensible settings, but it is real, so keep the original PNG if you need an exact master.
Does WebP keep transparency from a PNG?
Yes. WebP supports an alpha channel, so transparent backgrounds survive the conversion intact. This is the main reason to choose WebP over JPEG when converting PNG — JPEG has no alpha channel and fills transparent areas with white.
How much smaller is WebP than PNG?
It depends heavily on the image. Photographic content saved as PNG shrinks dramatically, because PNG is a poor fit for photographs in the first place. Flat graphics and screenshots — the content PNG handles well — see a smaller but still worthwhile reduction. Convert one representative file and measure before committing to a whole set.
Are my images uploaded when converting to WebP?
No. Decoding and re-encoding both happen in your browser on your own device, so nothing is uploaded, stored, or logged. A batch of design assets can be converted without any of them leaving your machine.
Looking for the full-featured version? Open the main Convert Image tool.
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