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Conversions:

Convert PNG to WebP

Turn PNG images into much smaller WebP files for websites, with transparency kept

Your PNG file

Conversion Configuration

WebP Quality (0 - 100)

Private by default · files deleted in 24hCapterra Best Ease of Use 2025

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Real example: what you get

We converted three test images with our PNG to WebP converter at its default settings and measured the files that came out. Measured on October 25, 2026.

Measured results, PNG to WebP at the default settings
Test image	File size, PNG → WebP	Quality
Photo	3.3 MB → 349.1 KB90% smaller	Slight softening in fine detail
Test chart	201.8 KB → 53.4 KB74% smaller	Looks the same at normal size
Text and graphics	832.9 KB → 94.4 KB89% smaller	Looks the same at normal size

Photo

PNG and WebP side by side, zoomed in 4x

3.3 MB → 349.1 KB, 90% smallerSlight softening in fine detail

A nature photo of the Isar river in Munich: water, leaves, sky and a stone bridge. Our lossless PNG original, scaled down from 2400 x 1600 to 1600 x 1067 px.

Original

PNG3.3 MB

1600 × 1067 px

Scaled-down preview.

Open full size

Converted

WebP349.1 KB

1600 × 1067 px

Scaled-down preview.

Open full size

Quality: Slight softening in fine detail. Detail score 0.926 (1 = identical), measured in the busiest 5% of the image.
Compression: Lossy at every quality setting we measured, 100 included: some pixels change slightly.
Color detail: Stored at half resolution: thin colored text can look slightly smudged.

the tower behind the trees, original PNG file, zoomed in 4x — Zoomed in 4x on the tower behind the trees: the real pixels of both files, no smoothing.

the tower behind the trees, converted WebP file, zoomed in 4x — Zoomed in 4x on the tower behind the trees: the real pixels of both files, no smoothing.

The same photo at other WebP quality settings

Quality	WebP file	What you see	Color detail
60	300.9 KB, 91% smaller	Slight softening in fine detail	Half
75 (default)	349.1 KB, 90% smaller	Slight softening in fine detail	Half
90	607.0 KB, 82% smaller	Looks the same at normal size	Half
100	1.0 MB, 69% smaller	Looks the same at normal size	Half

Each size opens that file.

Test chart

PNG and WebP side by side, zoomed in 4x

201.8 KB → 53.4 KB, 74% smallerLooks the same at normal size

A test chart: color bars, a gray wedge, smooth gradients, fine line pairs and colored text. Our lossless PNG original.

Original

PNG201.8 KB

1920 × 1080 px

Scaled-down preview.

Open full size

Converted

WebP53.4 KB

1920 × 1080 px

Scaled-down preview.

Open full size

Quality: Looks the same at normal size. Detail score 0.965 (1 = identical), measured in the busiest 5% of the image.
Compression: Lossy at every quality setting we measured, 100 included: some pixels change slightly.
Color detail: Stored at half resolution: thin colored text can look slightly smudged.

red 18 px text on blue, original PNG file, zoomed in 4x — Zoomed in 4x on red 18 px text on blue: the real pixels of both files, no smoothing.

red 18 px text on blue, converted WebP file, zoomed in 4x — Zoomed in 4x on red 18 px text on blue: the real pixels of both files, no smoothing.

The same test chart at other WebP quality settings

Quality	WebP file	What you see	Color detail
60	48.8 KB, 76% smaller	Looks the same at normal size	Half
75 (default)	53.4 KB, 74% smaller	Looks the same at normal size	Half
90	72.9 KB, 64% smaller	Looks the same at normal size	Half
100	99.2 KB, 51% smaller	Looks the same at normal size	Half

Each size opens that file.

Text and graphics

PNG and WebP side by side, zoomed in 4x

832.9 KB → 94.4 KB, 89% smallerLooks the same at normal size

A card with text from 12 to 78 px, colored badges, a thin-line chart, text over a photo and transparent rounded corners. Our lossless PNG original.

Original

PNG832.9 KB

1600 × 1000 px

Scaled-down preview.

Open full size

Converted

WebP94.4 KB

1600 × 1000 px

Scaled-down preview.

Open full size

Quality: Looks the same at normal size. Detail score 0.939 (1 = identical), measured in the busiest 5% of the image.
Compression: Lossy at every quality setting we measured, 100 included: some pixels change slightly.
Color detail: Stored at half resolution: thin colored text can look slightly smudged.
Transparency: Kept exactly: the transparent corners are still transparent.

the 14 px and 12 px text, original PNG file, zoomed in 4x — Zoomed in 4x on the 14 px and 12 px text: the real pixels of both files, no smoothing.

the 14 px and 12 px text, converted WebP file, zoomed in 4x — Zoomed in 4x on the 14 px and 12 px text: the real pixels of both files, no smoothing.

The same text and graphics at other WebP quality settings

Quality	WebP file	What you see	Color detail
60	81.6 KB, 90% smaller	Slight softening in fine detail	Half
75 (default)	94.4 KB, 89% smaller	Looks the same at normal size	Half
90	162.4 KB, 81% smaller	Looks the same at normal size	Half
100	280.8 KB, 66% smaller	Looks the same at normal size	Half

Each size opens that file.

How we measured

Each test image goes through the same converter you use on this page, with its default settings. We then compare the file that comes back with the file that went in, pixel by pixel, both decoded at full size. "Pixel-identical" means every pixel matches.

The quality words come from SSIM, a standard score for how alike two images look, taken in the busiest 5% of each image so that a calm sky cannot hide damaged detail. We set the thresholds by looking at zoomed-in crops of the same images.

The test images are our own: a photo we took and a test chart and text card we drew. We measure again whenever the converter changes.

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More Converters

Image Converters

Convert PNG to WebP online. Upload a PNG image and download a WebP that is a fraction of the size, shows in every current browser and keeps its transparent areas.

Smaller images make web pages load faster, which is why page speed tests so often suggest a modern format such as WebP. PNG is the right format while you edit an image; WebP is the lighter copy you put online.

How to Convert PNG to WebP

Choose your PNG image, or drag it onto the upload area.
Keep the default WebP quality of 75, or set your own between 0 and 100.
Click "Run Conversion" and download the WebP.

What You Get in the WebP

A much smaller file: 74% to 90% smaller than the PNG in our tests, with the same width and height.
Transparency kept: transparent and soft-edged areas come through exactly as they were.
Lossy compression: some pixels change slightly at every quality setting, 100 included. Keep your PNG as the master copy for editing.

About the PNG and WebP Formats

PNG stores every pixel without loss and supports transparency. Every app opens it, but photos in PNG are large: our 1600 × 1067 px test photo is 3.3 MB.

WebP is an image format made for the web. It can compress with or without loss and keeps transparency. Current versions of Chrome, Edge, Firefox and Safari all show it, while some older apps and upload forms still do not accept it.

Related Converters

WebP to PNG - The other way round, pixel for pixel
JPG to WebP - Smaller photos for websites
PNG to AVIF - Another modern web format
PNG to JPG - For apps and forms that ask for JPG

Frequently Asked Questions

How do I convert PNG to WebP?

Upload your PNG image
Optionally set the WebP quality (75 by default)
Click 'Run Conversion' and download the WebP

Is the WebP lossless?

No. This converter always makes a lossy WebP, even at quality 100, so some pixels change slightly. At the default quality of 75 our test chart and text graphic look the same at normal size, and our test photo shows slight softening in fine detail. To keep every pixel exactly as it is, keep the PNG.

How much smaller is a WebP than a PNG?

In our tests at the default quality of 75, a 3.3 MB photo became a 349.1 KB WebP (90% smaller), a graphic with text and transparent corners 89% smaller and a test chart 74% smaller.

Is transparency kept?

Yes. Transparent and semi-transparent areas of the PNG stay exactly as transparent in the WebP, so logos and cut-outs keep their edges.

Which quality should I choose?

The default of 75 suits most websites. Choose 90 for photos where fine detail matters: our test photo then looked the same as the PNG at normal size, and the file was still 82% smaller. Quality 100 is not lossless and only makes the file larger.

When should I keep the PNG instead?

Keep PNG when you need every pixel exactly, for example screenshots you will edit or pixel art; when an app or upload form does not accept WebP; and for images wider or taller than 16,383 pixels, the largest size a WebP can have.

Is the conversion free?

Yes. Without an account you can convert images up to 10 MB, 5 a day. A free account raises that to 20 MB and 10 a day, and lets you convert many PNG files at once in a ZIP archive.

Are my images secure?

Yes. Uploads travel over encrypted HTTPS, and your PNG file and the WebP are deleted from our servers automatically within 24 hours.

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