Convert PNG to WebP

Drop PNGs below and get WebP back, with transparency intact. Pick Lossless to keep every pixel or Smart for a much smaller file; up to 16 MB as a guest or 32 MB with a free account. Free. No account, no watermark.

  • WebP already selected
  • True lossless available
  • Transparency kept
Compression Level
None
No compression, only apply settings on image
Lossless
Without any visual change in the image quality
Ultra
Max compression with some quality loss
Smart
Balance between the image quality and compression
Change Format Will allow you to convert images to different extensions
Auto WEBP AVIF PNG JPG Auto tries every format your image can be saved as and gives you the smallest one
Resize Will allow you to change the width, height or scale of images
Keep EXIF Will allow you to preserve meta data in images
Maximum file size is 16 MB per image and supported formats are: PNG, JPG, JPEG, WEBP, GIF, HEIC, HEIF, TIFF, TIF
Guests get 10 images a day, 10 left today. A free account gets 40 a day.
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The image and its optimized copy will be removed from storage. This cannot be undone.

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Choose the name the optimized image downloads with. Its format stays the same.

Uploaded as

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Each image gets this name and a number, counted in the order they were uploaded. Their formats stay the same.

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Choose the compression level that suits your images
Level What it promises What happens Pick it when
Lossless
Not one pixel changes in a JPEG, PNG or GIF The file is repacked, never re-encoded. JPEGs get an optimised Huffman table and progressive scan, PNGs a tighter deflate pass, GIFs a lossless gifsicle run. A lossy WebP has no repack step, so it is re-encoded at the highest quality the level allows. A sideways phone JPEG is rotated losslessly on the way through and keeps its colour profile. The one exception to the promise is a PNG or WebP tagged with a wide-gamut profile such as Display P3: its colours are converted to sRGB, so the values change but the picture doesn't. Logos, line art, anything you'll edit again, or when the file is evidence.
Smart
No visible change, targets 40 dB PSNR and a perceptual score of 70 A quality search runs per image and stops at the lowest quality that still clears the PSNR target. That answer is then scored on the SSIMULACRA 2 scale, because an average over every pixel lets a mostly flat picture through at a quality its detail doesn't deserve, and when it falls under 70 the search moves back up until it doesn't. Photos and graphics end up at different qualities because they need different ones; an image that cannot reach the targets inside the quality ceiling is encoded at the ceiling. Almost everything on a website. This is the default for a reason.
Ultra
Smallest file, targets 34 dB PSNR and a perceptual score of 50 The same two-stage search with lower targets. Fine texture softens a little; edges and text stay sharp. Thumbnails, backgrounds, email images, anything shown small or blurred anyway.
None
No compression at all Only the resize, conversion or metadata setting you chose is applied. An untouched upload comes back byte for byte. You only wanted to resize or convert, and quality is someone else's decision.

Measured, not estimated

What PNG to WebP saved on four real graphics

Two screenshots, a social card and a transparent icon from our showcase. The Lossless column is pixel-identical to the PNG, which makes it the fairest comparison on the page.

Sample Original Lossless Smart Ultra
Social card 1200 by 630 208 KB PNG 144 KB 30.9% smaller 34 KB 83.5% smaller 15 KB 92.9% smaller
Phone screenshot 1170 by 2532 0.9 MB PNG 542 KB 43.5% smaller 251 KB 73.8% smaller 137 KB 85.7% smaller
App icon 1600 by 1600 113 KB PNG 26 KB 77.3% smaller 19 KB 82.9% smaller 19 KB 82.9% smaller
Desktop screenshot 1440 by 900 303 KB PNG 152 KB 49.7% smaller 100 KB 66.9% smaller 100 KB 66.9% smaller

Metadata stripped, no resize. On the icon and the desktop screenshot, Smart and Ultra are the same file: both were won by WebP's near-lossless mode, which doesn't take a quality setting.

Why WebP

The safe upgrade from PNG

WebP does everything a PNG does on the web: transparency, sharp edges, lossless storage. It does them in fewer bytes, and every current browser has displayed it for years. If you're still serving PNGs on a site, this is the conversion with the least to think about.

Choose Lossless and cwebp's lossless compressor runs at its highest effort. Not one pixel changes. Choose Smart or Ultra on a graphic and Iminify encodes it three ways: lossy, lossless and near-lossless, which nudges pixel values by a step or two so they pack tighter. It keeps whichever is smallest. On drawn images the near-lossless file often wins, and it scores around 90 on the SSIMULACRA 2 scale, which is visually lossless.

Lossy WebP stores colour at half resolution, so on graphics Iminify switches on sharp chroma conversion to stop coloured text from smearing at its edges.

What survives

What a PNG keeps on its way to WebP

  • Transparency

    WebP has a full alpha channel in both its lossless and lossy modes.

  • Every pixel, at Lossless

    A PNG is a lossless source, so Lossless here really is lossless. The one exception is a wide-gamut colour profile, which is converted to sRGB.

  • EXIF, when you switch it on

    If your PNG carries an EXIF block and Keep EXIF is on, it's written into the WebP after the encode.

  • Animation

    An animated PNG becomes its first frame. For animation, start from a GIF: GIF to WebP keeps every frame.

When not to

When PNG should stay PNG

  • The file goes somewhere that doesn't take WebP: some email clients, older design software, a few social upload forms.
  • It's an app icon, a favicon or another asset whose spec names PNG.
  • You only want a smaller PNG. The Compress PNG page does that without changing the format.

How to

PNG to WebP in three steps

  1. 1

    Drop your PNGs

    WebP is already chosen under Change Format.

  2. 2

    Lossless or Smart

    Lossless for logos and anything you'll edit again. Smart for everything that only has to look right on a page.

  3. 3

    Download

    Single files, or the whole batch as a zip.

Questions

PNG to WebP questions

From the blog

What we've measured so far

We run the encoders on real photos and screenshots and publish the numbers: when WebP beats AVIF, what quality 80 means in each encoder, and how many kilobytes an image on a web page should weigh.

All posts
The same app icon twice: as a 19,794-byte WebP with its transparency showing the background through, and as a 63,801-byte JPEG sitting on a white square.

Does converting PNG to WebP lose quality? Five files, every pixel checked

We converted five PNG files to WebP with the encoder forbidden to throw anything away, then compared every pixel against the original. All five kept every 8-bit pixel, and the files were between 28.6% and 77.3% smaller. So no, converting a PNG to WebP doesn't have to cost you anything you can see. The catch is that it isn't the conversion you're usually pointed at. Of the first four results for this question in September 2026, three recommend a quality number between 80 and 100, and in cwebp every one of those is a lossy setting. So is the button marked "compress PNG". Here's what each of them actually costs.

8 min read
Twelve sites and the image format Chrome got from each on 23 September 2026: WebP from Reddit, a Shopify store, Squarespace, BBC News, eBay; AVIF from Wix, YouTube, The Guardian, Unsplash; JPEG from Pinterest, Medium, Wikipedia.

Why do images save as WebP? What 12 sites sent Chrome, and how to get the JPG

The hero photo on the Allbirds home page has a file name that ends in .jpg. On 23 September 2026 the site sent Chrome a WebP of 572 KB. Ask the same image address for a JPEG and it sends one, 663 KB. That's why your saved image is a WebP. Many sites pick the format each time they send a picture, from a list of formats your browser says it can show. Twelve sites made it into our test: nine sent Chrome a WebP or an AVIF, and every one of those nine would also hand over a JPEG (JPG is the same format) if asked the right way. The four ways that worked are below the table.

8 min read
Bar chart of ten test images: each one as AVIF, sized against the same image as WebP at a matched quality score. The bars run from 29.8% on the transparent icon to 74.5% on the product photo.

AVIF vs WebP file size: ten images, one quality score, and where WebP still wins

Five of the fifteen pages we read for "avif vs webp file size" put AVIF 20 to 30% under WebP, ShortPixel among them. Six give no comparable figure, three put it between 11.76% and 50%, and one forum thread reports an AVIF twice the size. We put the ten images of our published corpus through cwebp and two builds of avifenc, bisecting each to the same SSIMULACRA 2 score of 80. The totals: 1,675.4 KB for WebP, 1,114.7 KB for a current AVIF, 33.5% smaller. So the headline is roughly right. It's also the least useful number here. If the verdict is all you want: AVIF for photographs and screenshots, WebP for lossless, and WebP again on our one transparent image once both encoders keep the alpha plane lossless.

8 min read

Convert your PNGs to WebP

WebP is already selected. Choose Lossless if nothing may change, Smart if smaller matters more.

Convert PNG to WebP Open the full tool