How much smaller is WebP than PNG?

For a photograph or a rich graphic, often dramatically smaller, because PNG is lossless and WebP compresses photographically. For an already-tiny flat icon the saving is modest. The tool measures the real bytes for your file, and keeps your original if a re-encode would be larger.

Does PNG transparency carry over to WebP?

Yes. WebP supports an alpha channel just as PNG does, so a transparent PNG stays transparent as a WebP. You get the smaller file without losing the cut-out.

What is the downside of WebP?

Reach. WebP opens in current browsers and modern image apps, but some older software still cannot read it. Pick it for the web and modern tools, not for a file bound for ancient software.

Is converting PNG to WebP lossy?

It can be. At the default quality WebP re-encodes photographically, which discards a little detail you will not see at normal sizes. For flat graphics you can push the quality slider up to stay effectively pristine.

Is it free and private?

Yes. The conversion runs inside your browser, so the PNG is read from disk into the page and never uploaded. No account, no daily cap, and it works with your Wi-Fi off.

PNG to WebP,
far smaller, transparency kept.

PNG is honest but heavy. If your PNG is headed for the web or for storage — and it'll only ever open in modern software — WebP usually shrinks it a lot while keeping the transparency PNG is prized for. This converts your PNGs to WebP in the page, on your machine, with nothing uploaded.

Converter Last checked: July 2026

The short version

WebP is the format that gives you PNG's best trick — transparency — without PNG's weight. On a photograph or a detailed graphic, a WebP is typically much smaller than the same image as PNG, which is exactly why the web runs on it. The cut-out background survives; the file just gets lighter.

Two things to keep in mind. WebP opens in modern software only — current browsers and recent apps, not every dusty tool. And at the default quality it's lossy, so it's ideal for photos and web imagery; for a flat graphic you want pixel-exact, push the quality slider up or keep the PNG.

Convert PNG to WebP now

Opens with WebP already chosen under "Save as". Free, no account, no daily cap. Nothing uploads — the ledger shows the exact bytes saved per file.

Open the converter

Convert a PNG to WebP in three steps

Open the converter. The button above lands on the tool with WebP already selected under "Save as".
Add your PNGs. Drop, paste, or choose a folder. Read into the tab, never uploaded.
Save the WebP files. Each is re-encoded on your device, transparency intact — save individually or as one zip.

When PNG to WebP is the win

PNGs on a website. Heavy PNG graphics slow pages down. WebP keeps the look and the transparency while cutting the bytes — often sharply.
A folder of screenshots or exports. Design tools spit out big PNGs. Batch them to WebP and reclaim a lot of disk, transparency preserved.
Cut-outs and stickers for modern apps. You keep the see-through background and shed the weight — the best of both, as long as the target is recent.

The honest caveats

Modern software only. That's the real cost. If the file has to open on something older, keep the PNG or use JPG for that copy. For today's browsers and apps, WebP is safe.
Default WebP is lossy. A photograph loses a little detail you won't see. For a flat graphic that must stay pixel-exact, raise the quality slider or keep the lossless PNG.
Transparency is kept — this is the whole reason to pick WebP over JPG here. The alpha channel comes across intact.
Nothing uploads, and you can check it. Watch the Network tab, or switch off your Wi-Fi and convert anyway. EXIF metadata is dropped in the re-encode; rotation is applied.

Questions people actually ask

How much will I save?: It depends on the image, so no fixed number — but for photos and rich graphics WebP is usually far smaller than PNG. The tool measures the real saving for your file, and keeps your original if a re-encode would be bigger.
Will the transparency survive?: Yes. WebP supports an alpha channel like PNG, so a transparent PNG stays transparent as a WebP.
Who might not be able to open a WebP?: Some older desktop software and a few upload forms. Current browsers and modern apps are fine. If reach matters more than size, keep the PNG.
Is PNG to WebP free, with no limit?: Yes — no account, no daily cap, no file limit. It runs on your device, so a folder at once is normal.
Are my files uploaded?: No. Turn off your Wi-Fi and convert one; it works, because the whole thing runs in this page.

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Ready when you are

Convert one PNG and watch the ledger report the real saving for your file. Free, unlimited, and nothing leaves your device.