PNG to WebP Converter
Shrink PNGs for the web without giving up transparency: WebP keeps the alpha channel and cuts the bytes. Quality is your call, and every row reports the true before/after sizes — including the occasional honest "your PNG was already smaller."
Convert PNG files to WebP
Drop .png files and pick a quality. Output is sniffed and re-decoded to confirm it truly is WebP before download.
Why send a PNG to WebP
PNG's losslessness is the right choice while an asset is being made — and a heavy one once the asset ships. Web pages pay for every kilobyte in load time and bandwidth budgets, and PNGs of screenshots, hero images, and illustrations are usually the heaviest things on them. WebP was designed for exactly this hand-off: it compresses far harder than PNG while, unlike JPEG, still carrying the full alpha channel. That combination — small and transparent — is why this direction exists as its own tool.
What you trade, stated plainly
The browser's WebP encoder is lossy: pixels are approximated, controlled by the quality slider (default 85). For photographs and busy artwork the approximation is invisible; for pixel art or single-pixel hairlines it may not be, and the truly lossless WebP mode is not reachable from a canvas — no browser exposes it. If exact pixels are the requirement, keep PNG and consider the Image Resizer to cut dimensions instead of fidelity. Re-encoding also strips metadata (color-profile and text chunks), and the output's actual format is verified by magic-byte sniffing so a non-WebP-capable browser produces an honest error, never a mislabeled file.
No fake savings
Converters love advertising "up to 90% smaller!" This one advertises nothing: each file row prints the input bytes, the output bytes, and — when the WebP comes out larger, which happens with tiny flat-color PNGs that PNG already compresses superbly — a note that keeping your original is the better choice. Compression results belong to your image, not to a marketing page.
Related tools
Unwrapping WebP back into PNG is WebP to PNG. Photographs headed to WebP more often start life as JPG — that is JPG to WebP. To chase a specific file-size ceiling in KB, use the Image Compressor's target-size mode.
Frequently asked questions
Does WebP keep my PNG’s transparency?
Yes — this is WebP’s headline advantage over JPEG here. The alpha channel converts intact, so transparent logos, stickers, and UI assets keep their edges while shrinking substantially.
Is the conversion lossless like PNG?
Not through a browser. WebP does have a lossless mode, but browsers’ canvas encoders only expose lossy WebP with a quality parameter. At the default 85 the difference is rarely visible; if bit-exact pixels matter to you, stay with PNG — the page tells you this rather than hiding it.
How much smaller will my file get?
No universal percentage is honest, so this tool does not print one. Photographic PNGs typically shrink dramatically; small flat-color graphics sometimes barely move, and occasionally WebP comes out LARGER — the row shows the real before/after bytes, and warns you when keeping the original would be better.
Where is WebP safe to use nowadays?
Every current browser (Chrome, Edge, Firefox, Safari 14+) displays WebP, and modern CMSes accept it. The stragglers are old software, some email clients, and strict upload forms — for those, JPG or PNG remains the safer handoff.
Can my browser actually create WebP files?
Chrome, Edge, Opera, Firefox 96+, and Safari 17+ can. On a browser that cannot, this tool detects the substitution during output verification and tells you honestly instead of handing you a mislabeled PNG.
Are files uploaded to a server?
No — encode and verify both run locally in your tab. The site’s security policy forbids requests to other origins; the methodology page explains how to see that for yourself.
Local processing: conversion, verification, and downloads are all generated inside your browser — nothing is transmitted. See the methodology page to verify.