Much smaller files
WebP typically saves 25–35% over PNG at similar visual quality, which is the single easiest way to make a page with many images load faster.
PNG to WebP Converter
Re-encode PNGs as WebP to cut file size while keeping transparency, right in your browser.
- Upload
- Batch upload supported · 25 MB max
- Privacy
- Nothing is uploaded
- Cost
- Free · no sign-up · no watermark
Loading tool…
The tool is loading its code on your device. This happens once and is cached for later visits.
Processed entirely on your device
Your file is read, transformed and re-encoded inside this browser tab using JavaScript. There is no upload endpoint — nothing leaves your machine, nothing is stored, and the result is created as a local object URL that disappears when you close the page.
Overview
About the PNG to WebP Converter
Convert PNG to WebP free online and cut file size by up to a third with transparency intact. Batch, in-browser conversion with no upload. By CollabsTool.
Why convert PNG to WebP
PNG is a fine archival format but a heavy one for the web. It is lossless, so it stores every pixel exactly, which costs bytes — a screenshot or a photographic PNG can be several times the size of an equivalent WebP. When an image is going to be served to visitors rather than kept as a master, converting PNG to WebP is the simplest way to shrink it, and modern browsers all render WebP natively, so nothing is lost on the page.
How the conversion works
The browser decodes your PNG into raw pixels, draws them onto an HTML canvas, and re-encodes that canvas as WebP at the quality you set. WebP's lossy mode uses prediction much like a modern video codec, which is why it can drop a quarter to a third of the bytes while looking almost identical. The alpha channel is carried through, so transparency in the source survives into the WebP — the reason to pick this over PNG to JPG for anything with a cut-out.
Choosing a quality, and when to keep the PNG
The quality slider runs from 40 to 100%. For photographs and most artwork, 80–90% is the sweet spot: visually indistinguishable from the original at a fraction of the size. Push toward 100% for graphics with razor-sharp text or thin lines, where a lossy codec can leave faint ringing, and drop lower when the file is a thumbnail and every kilobyte counts. There are times to keep the PNG instead — when you need bit-exact pixels for a master, for a print file, or for repeated editing round trips, lossless is worth the bytes and WebP conversion should wait until the final export.
Support and privacy
Encoding WebP from a canvas is supported in Chrome, Edge, Firefox and Safari 16.4 and later. On a browser that cannot, the tool probes first, disables the action and says why, so you are never handed a corrupt file. Up to twenty files convert in one run, each up to 25 MB, processed one at a time, with a summary strip totalling the batch before and after so the saving is visible at a glance. Nothing is uploaded: the decode, the re-encode and every download happen inside the tab, which is what makes this safe for brand assets and unreleased artwork. No account is asked for and no watermark is added.
Step by step
How to use the PNG to WebP Converter
Drop one or more images onto the upload area — .png or any other format, which is detected automatically.
Set the quality slider; 80–90% is usually indistinguishable from the original at a fraction of the size.
Optionally cap the longest edge so oversized images are scaled down in the same pass.
Press Convert to WebP — each file is decoded and re-encoded locally, one at a time.
Read the result row for the size saving, then download each WebP or the whole batch.
Why use it
Benefits and common use cases
What this tool is good for, and what it deliberately does not try to do.
Transparency survives
WebP carries a real alpha channel, so logos, icons and cut-out subjects keep their see-through background — unlike converting to JPG, which would flatten it.
Quality you control
A slider from 40 to 100% lets you trade a little fine detail for a much smaller file, or keep it high for artwork where every edge matters.
Private by construction
The browser's own image pipeline does the decode and re-encode, so brand assets and unreleased artwork never leave your device.
Questions
Frequently asked questions
Short, honest answers about quality, limits and privacy.
Is converting PNG to WebP lossy?
This tool encodes lossy WebP at the quality you choose, which is where the large savings come from. At 90% and above the difference from the PNG is very hard to see on photographs and most artwork. If you need bit-exact pixels, keep the PNG — lossy encoding discards some detail by design.
Does WebP keep a transparent background?
Yes. WebP supports a full alpha channel, so a PNG with transparency converts to a WebP with the same transparency. This is the main reason to choose WebP over JPG for logos and cut-out subjects.
Why would I convert PNG to WebP?
Almost always for size. A WebP is usually a third smaller than the equivalent PNG, which shortens load times and reduces bandwidth on any site or app that serves the image. Modern browsers all display WebP, so there is little downside for web use.
Which browsers can encode WebP?
Chrome, Edge, Firefox and Safari 16.4 and later can all write WebP from a canvas. On an older browser that cannot, the tool detects it, disables the conversion and explains why rather than producing a broken file.
Can I convert many PNG files at once?
Yes — up to 20 files per run, each up to 25 MB, processed one at a time so memory stays predictable. A file that cannot be decoded is reported with its reason while the rest of the batch still converts.
Are my images uploaded to a server?
Never. There is no upload endpoint. The decode, the re-encode and every download happen inside your tab, and each result uses a local object URL that is released shortly after the click.