Image to WebP Converter
Convert PNG or JPG to WebP with a quality slider and live size savings, all in your browser. 100% free, no signup. Everything runs in your browser.
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This converter turns PNG and JPG images into WebP right in your browser. Drop in one file or a small batch, move the quality slider, and watch the live size comparison update: original size, WebP size, and the percent saved. When it looks right, download files individually or grab the whole batch as a zip. There is no signup, no watermark, and, because the conversion happens on your own machine using the canvas API, nothing is ever uploaded.
I built this while shaving page weight on this very site. Watching a 900 KB PNG become a 90 KB WebP with no visible difference is the kind of small joy I want more people to have.
How to use
- Drag and drop your PNG or JPG files onto the page, or click to browse. A handful at a time works fine.
- Set the quality slider. Around 80 is a sensible starting point for photos; nudge it down until artifacts appear, then step back up.
- Watch the size comparison for each file: original bytes, WebP bytes, and the percentage saved.
- Preview the converted image to check fine detail like text edges and gradients.
- Download files one at a time, or use the zip option to grab the whole batch at once.
- If a file gets bigger instead of smaller, which happens with tiny simple graphics, keep the original.
Why use our image to webp converter?
WebP typically lands meaningfully smaller than a comparable JPG and often dramatically smaller than PNG for photographic content, which is why it became the default recommendation for page speed work. Google's own WebP documentation covers the format's lossy and lossless modes in detail. For a site with a few dozen images, converting them is one of the highest-leverage performance wins you can get for free.
An honest note on how this works: the browser decodes your image to pixels on a canvas, then re-encodes those pixels as WebP. The output is a fresh encode, not a byte-level translation, so metadata like EXIF is dropped and a lossless PNG becomes lossy WebP at your chosen quality. For web photos this is almost always fine. For pixel-perfect archival work, keep your originals.
Transparency survives the trip. PNG alpha channels come through intact, which is what makes WebP a genuine PNG replacement for logos and UI graphics rather than just a JPG replacement. And the old compatibility worry is essentially over: every current major browser, Safari included, has supported WebP for years now, so the era of maintaining fallback images has mostly passed.
Because everything runs locally, this tool works on files you would never send to a random conversion site: client mockups, unreleased product shots, personal photos. It also means speed depends on your machine, not an upload bar. Pair it with my image compressor to squeeze JPGs without changing format, or the image resizer to scale dimensions down first, which usually saves more bytes than any format change. And if you shoot on an iPhone, my HEIC to JPG converter gets Apple's format into something this tool can then turn into WebP.
Who is this tool for?
Speeding up a website. Product photos, blog headers, and portfolio images are usually the heaviest things on a page. Convert them at quality 80, re-upload them, and your largest contentful paint improves without touching a line of code.
Preparing product images for marketplaces and site builders that accept WebP. Smaller files upload faster on bad Wi-Fi, and a quality 85 WebP is indistinguishable from the JPG original for most product shots.
Shrinking a folder of screenshots for documentation. UI screenshots convert beautifully because WebP handles flat color regions well, and the zip download keeps a thirty-file batch manageable.
Email and chat attachments. When a design mockup needs to reach a client and the PNG is 8 MB, a visually identical WebP under 1 MB is simply kinder to everyone involved.
Working through an old photo folder before backing it up to the cloud. Converting the keepers at quality 90 cuts the storage bill meaningfully, and because the conversion is local, none of the family photos pass through a third party on the way.
Frequently asked questions
For web delivery, usually. Lossy WebP beats JPG at like-for-like quality on most images, and WebP with transparency beats PNG by a wide margin on photos and complex graphics. Tiny simple graphics are the exception, where PNG sometimes stays smaller. The live comparison shows you the answer per file.
Yes, all current major browsers do: everything Chromium-based, Firefox, and Safari, which added support back in Safari 14. Unless your audience includes very old operating systems, you no longer need fallback images.
Yes. PNG alpha channels are preserved in the WebP output, so logos and cutout images keep their transparent backgrounds. This is one of WebP's biggest wins over JPG, which has no transparency at all.
Start at 80 for photos, and 85 to 90 for images with text or sharp edges. Because the preview and size comparison are live, the honest answer is to look: drop the slider until you can see damage, then step back up a notch.
Small, simple PNGs like icons are sometimes already near-optimal, and re-encoding them can cost more bytes than it saves. The tool shows the size delta per file, so just keep the original whenever WebP loses.
No. The conversion uses your browser's canvas API on your own machine. Nothing leaves your device, which you can confirm by loading the page and then using the tool with your connection switched off.
Yes. Because the canvas re-encodes pixels, EXIF data like camera model and GPS location is dropped. For web publishing that is usually a privacy feature rather than a bug, but keep your originals if you need the metadata later.