A full-resolution PNG screenshot can easily run several megabytes, and a page that loads a dozen of them will feel it. PNG earns its size in the right context — it is lossless and it handles transparency perfectly — but as a delivery format for the web it is often the heaviest option on the table. Designers exporting mockups, developers documenting features, and bloggers embedding walkthrough screenshots all end up with folders of oversized PNGs that were never meant to travel over a network connection. If a Lighthouse report is scolding you about image weight, the PNGs are usually the first place to look.
WebP keeps the two things people actually depend on PNG for — sharp rendering and full alpha transparency — while cutting file size substantially, especially for screenshots, UI captures, and photographic images that ended up saved as PNG somewhere along the way. Every modern browser renders WebP natively, so there is no fallback dance required for a current audience. The format is over a decade old now and long past the compatibility concerns that dogged its early years.
Conversion happens right in your browser. Drop the files in and a WebAssembly encoder processes them on your own hardware — nothing is uploaded, nothing is stored on a server, and no account is involved. For screenshots of admin panels, internal tools, or unreleased designs, keeping the files on your machine is the whole point. The tool is free, and the encoder — a one-time download of about 5 MB — is cached by your browser, so later batches start instantly.
The quality slider defaults to 80, a good starting point for screenshots and photos alike. For flat-color graphics with hard edges — logos, icons, diagrams — push it toward the top of the range and compare the output against the original before shipping; lossy compression is at its weakest around razor-sharp boundaries. And keep your original PNGs as source files. WebP is what you serve; PNG is what you edit.
Why convert PNG to WebP?
- Substantially smaller files for screenshots, UI captures, and photos that were saved as PNG
- Full alpha transparency carries over — logos and cutouts keep their clean edges over any background
- Every modern browser renders WebP natively, with no fallback markup needed
- An adjustable quality slider lets you push for maximum savings or maximum crispness per image
- Lighter images mean faster page loads and better performance scores without redesigning anything
How it works
- Step 1
Drop your files
Drag your PNG files into the converter above, or click “Choose files”. Batches are welcome.
- Step 2
Pick your settings
WebP is preselected. Adjust quality or size if you want, or keep the defaults.
- Step 3
Convert and download
Conversion runs locally in your browser. Download files individually or grab everything as a zip.
Frequently asked questions
- Is anything uploaded when I convert my files?
- Nothing. The encoder is WebAssembly running inside your browser, so your PNGs are read and the WebP files are written entirely on your own device. No server sees the images, no copies are retained anywhere, and no signup stands between you and the converted files.
- Will transparency survive the conversion?
- Yes. WebP supports a full alpha channel, so a PNG logo, icon, or cutout keeps its transparent regions intact — including partial transparency like soft shadows and anti-aliased edges. This is the main advantage WebP holds over JPEG as a PNG replacement, since JPEG would force everything onto an opaque background.
- How much smaller will my images get?
- It depends heavily on the content. Screenshots and photographic images stored as PNG tend to shrink the most, often to a small fraction of their original size, because PNG is a poor fit for that kind of content to begin with. Simple flat graphics that PNG already compresses well will see more modest gains. The honest answer is to convert a few representative files and look at the results.
- Will sharp-edged graphics like diagrams and UI text look worse?
- At the default quality of 80 most screenshots hold up well, but hard edges and small text are where lossy compression shows its seams first. If you spot fringing around text or lines, raise the slider toward the maximum — the file will still usually come out smaller than the PNG. Comparing output to original at full zoom before publishing takes only a moment.
- Should I delete my PNGs after converting?
- Keep them. PNG is lossless, which makes it the right master format for anything you might edit again; WebP output from a quality slider is lossy, so re-editing and re-saving it repeatedly will slowly accumulate artifacts. Treat the PNG as the source of truth and the WebP as the deliverable you serve to visitors.