PNG to WebP Converter
Convert PNG images to WebP for smaller files and faster pages. Adjustable quality, runs locally.
How to use PNG → WebP
- 1Add a PNG
Drop or pick a PNG file.
- 2Adjust quality
WebP quality slider — 80 is a good default.
- 3Download .webp
Save the converted file.
About PNG → WebP
WebP is a modern image format developed by Google specifically for web delivery. In Google's own study, lossless WebP comes out about 26% smaller than PNG — and the lossy WebP this converter produces typically saves far more, especially on photographic PNGs — while retaining full alpha-channel transparency support, the main reason most sites use PNG in the first place. All modern browsers — Chrome, Firefox, Safari, Edge — support WebP natively, with combined coverage above 97% of global users.
Converting your PNG assets to WebP reduces page weight (which directly improves Core Web Vitals LCP scores), bandwidth costs (which matter at scale), and load times on slow connections — without sacrificing visual fidelity. Utilify converts PNG to WebP entirely in your browser using the Canvas API. The quality slider controls how aggressively lossy compression is applied; 80 is a good starting point that is indistinguishable from PNG to the naked eye.
WebP comes in two flavors, and which one you get depends on the quality setting — in a way we have actually measured. Below 100, the slider tunes a lossy encoder: quality 80 traded a little detail for much smaller files in our tests. At exactly 100, Chrome and Firefox switch the canvas encoder into WebP's true lossless mode — we verified the output decodes back bit-for-bit identical to the source, at roughly half the size of the PNG. For photographic PNGs — screenshots of photos, exported renders — lossy WebP around 80 is the clear win. For graphics with crisp text or hard edges, push the quality up (or all the way to 100) to avoid the faint smudging that lossy compression can leave around outlines.
The biggest savings come from converting PNGs that should never have been PNGs in the first place. PNG is a lossless format designed for graphics and transparency; when people save photographs as PNG, the files balloon to many times the size of an equivalent JPEG or WebP for no visual benefit. Running such a file through this converter often cuts its size by 70% or more, which is exactly the kind of easy win that moves a page-speed score.
Transparency carries over cleanly: WebP supports an alpha channel just like PNG, so logos, icons, and cut-out images keep their transparent backgrounds after conversion. That is what lets WebP replace PNG across an entire site rather than only for opaque photos — you get the smaller files without giving up the one feature that made PNG necessary.
When to use PNG → WebP
- Site performance
Replace heavy PNG hero images with WebP to cut page weight and improve LCP scores.
- CDN cost reduction
Smaller files at the same visual quality means lower egress bandwidth costs.
- Mobile experience
Reduce data usage for users on metered or slow mobile connections.
PNG → WebP edge cases worth knowing before you convert
- Animated PNGs come out frozen
An APNG usually carries the ordinary .png extension, so it converts here without complaint — but the canvas pipeline only ever sees the format’s default image, so the output is a static WebP of the first frame. No browser canvas encoder can produce animated WebP; for that you need a dedicated tool like Google’s cwebp/img2webp toolchain.
- Wide-gamut color gets pulled back to sRGB
Canvas operates in sRGB by default, so a Display P3 screenshot from a modern Mac or phone is converted to sRGB on the way through. Most images are unaffected, but heavily saturated reds and greens can come out subtly duller than the original. If exact wide-gamut color matters, convert with a color-managed tool instead.
- 16-bit PNGs are flattened to 8 bits per channel
PNG can store 16 bits per channel; canvas pixel data is 8-bit. A 16-bit render or scan converts fine visually, but the extra depth — headroom that matters for further editing or gradients in dark tones — is discarded before encoding. Keep the 16-bit original if you plan to edit later.
- Quality 100 means lossless in some browsers — but no spec guarantees it
We measured this: at quality 100 exactly, Chrome and Firefox flip the canvas encoder into WebP’s true lossless mode — the output decoded back bit-for-bit identical to the source in our tests. But the HTML spec treats the quality argument as an encoder hint, so no standard promises that behavior, and at 99 you are firmly back in lossy territory. When lossless output is a hard requirement rather than a nice surprise, use cwebp -lossless, which guarantees it.
- Text chunks and metadata do not survive
PNGs can carry metadata — creation info, attribution and copyright in tEXt chunks, and orientation data. Re-encoding through the canvas produces a brand-new file with none of it. As with our Image Compressor, this doubles as a privacy feature before publishing, but if you rely on embedded attribution, export from a tool that preserves it.
Frequently asked questions
Why convert PNG to WebP?+
Smaller files at the same visual quality: Google measured lossless WebP about 26% smaller than PNG, and the lossy WebP this tool produces usually saves far more in practice — often 70% or more on photographic PNGs, going by typical conversions — with full alpha-channel support. Pages load faster and bandwidth costs drop.
Will transparency be preserved?+
Yes — WebP supports an alpha channel just like PNG, so transparent logos, icons, and cut-outs keep their transparency after conversion.
Do all browsers support WebP?+
For viewing, effectively yes — Chrome, Firefox, Safari, and Edge all display WebP natively, covering more than 97% of global users. Creating WebP is a different story: Safari’s canvas cannot encode WebP, and when asked to, it silently returns a PNG instead. This tool detects that and tells you, rather than handing you a PNG with a .webp extension — to convert, use Chrome, Edge, or Firefox.
Will the WebP look worse than the PNG?+
At quality 80 it is visually indistinguishable for most images. Keep quality high for graphics with sharp text or edges, where heavy lossy compression can cause faint smudging.
Is my PNG uploaded?+
No — conversion runs locally in your browser with the Canvas API. Your files never leave your device.
Can this produce lossless WebP?+
In Chrome and Firefox, yes: set the quality slider to exactly 100 and the canvas encoder switches to WebP’s lossless mode — we verified the output decodes back bit-for-bit identical to the PNG. But that behavior is a browser implementation detail, not something the HTML spec guarantees, so when bit-exact lossless output is a hard requirement, use Google’s cwebp command-line tool with the -lossless flag.
Related tools
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From the blog
We measured browser image conversion pixel by pixel: PNG ignores the quality argument, JPEG at quality 100 is still lossy, WebP at exactly 100 flips to true lossless in Chrome and Firefox — and Safari silently returns a PNG when you ask for WebP. That last one was a bug in our own converter.
WebP is 25-34% smaller than JPEG with ~95.6% global browser support. A decision guide to PNG vs JPEG vs WebP: compression, transparency, and when to use each.