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Jay PadimalaMarch 20265 min read
Image Tools5 min read

Convert PNG to WebP Free — Smaller Files, Same Quality

Convert PNG to WebP online for free. Reduce file size by 30-50% with no visible quality loss. Batch convert. guest access on supported tools only; AI uses signed-in credits, local-first.

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Access and pricing

Supported tools include 5 free on-device uses per day, shared across eligible tools. On compatible devices, guest access needs no sign-in. Signed-in users also get 5 daily eligible on-device uses. AI and cloud processing use credits separately.

New accounts can claim 20 welcome credits once. Eligible offers in MiOffice can earn up to 80 reward credits; offer conditions apply.

Starter costs $6.99/month and includes 250 credits at each paid renewal plus unlimited eligible local processing. Unused credits roll over. The $2.99 Day Pass covers 24 hours of eligible local processing; AI and cloud credits are separate.

Compare tools using a representative file and inspect the export. Check supported formats, device compatibility, processing location and the displayed cost before starting. This article is published by MiOffice; consider its recommendations with that affiliation in mind.

Pricing

Access and pricing updated October 30, 2026. This editorial update does not indicate a new test run.

Why Convert PNG to WebP?

WebP is Google's modern image format that delivers the best of both worlds: smaller file sizes than PNG with the same transparency support. If you're building a website, WebP is the format Google recommends for optimal Core Web Vitals.

30-50% Smaller Files

WebP compresses better than PNG for both photos and graphics. A 5MB PNG becomes 2-3MB in WebP with no visible quality difference.

Keeps Transparency

Unlike JPG, WebP supports full alpha channel transparency. Convert transparent PNGs to WebP without losing any transparency data.

Better Google PageSpeed

Google PageSpeed Insights specifically recommends WebP. Using WebP images can improve your Lighthouse performance score by 10-20 points.

Universal Browser Support

All modern browsers support WebP — Chrome, Firefox, Safari 14+, Edge, and Opera. Over 97% of web users can view WebP natively.

How to Convert PNG to WebP Online

  1. 1

    Open the PNG to WebP Converter

    Go to our free PNG to WebP converter. Guest access on supported tools; AI requires sign-in and credits or software needed.

  2. 2

    Upload Your PNG Files

    Drag and drop PNG images. Batch convert supported — add as many files as you need.

  3. 3

    Download WebP Files

    Your WebP files are ready instantly. Transparency is preserved. Use them directly on your website.

PNG vs WebP: Size Comparison

Image TypePNG SizeWebP SizeSavings
Photo (4K)15-25 MB3-5 MB~75%
Logo (transparent)200-500 KB80-200 KB~60%
Screenshot (1080p)2-5 MB500KB-1.5 MB~70%
Icon (128px)10-30 KB5-15 KB~50%

MiOffice vs Other Converters

FeatureMiOfficeSquooshCloudConvert
PrivacyClient-side onlyClient-sideServer upload
Batch ConvertYesOne at a time25/day free
Quality ControlAdjustableAdvancedYes
SpeedInstantInstantServer dependent

Private conversion, always. MiOffice converts PNG to WebP entirely in your browser using Canvas APIs. Unlike CloudConvert and Convertio, your images are processed in your browser. Your files stay on your device.

WebP vs PNG vs JPG

Optimize for Web Speed

PNG to JPG

Process Your Image Now

MiOffice AI is an AI-powered digital workspace studio. Create, edit, convert, compress, collaborate, and share — video, audio, images, documents, scanning, notes, screen sharing, and file transfer. the full MiOffice catalog, all in one place.

Get StartedLocal and cloud processing have different privacy terms

Frequently Asked Questions

How much smaller is WebP than PNG?
WebP lossless is typically 26% smaller than PNG. WebP lossy can be 25-34% smaller than JPEG at equivalent quality. For photos originally in PNG, WebP can reduce size by 50-70% with negligible quality loss.
Does WebP support transparency like PNG?
Yes — WebP supports full alpha channel transparency, just like PNG. Unlike JPG, you can convert transparent PNGs to WebP without losing the transparency.
Do all browsers support WebP?
Yes, as of 2023. Chrome, Firefox, Safari, Edge, and Opera all support WebP. Safari added support in version 14 (2020). The only holdout was Internet Explorer, which is discontinued.
Can I convert multiple PNGs to WebP at once?
Yes — drag and drop multiple PNG files for batch conversion. They'll all be converted to WebP simultaneously.
Are my images uploaded to any server?
No. MiOffice converts images entirely in your browser using Canvas APIs. Your files stay on your device.

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Works on all your devicesChromeSafariFirefoxEdgeiPhoneAndroidMacWindowsLinuxChromebook

Jay Padimala

CEO & Founder

Jay Padimala is CEO and Founder of MiOffice, a product of JSVV SOLS LLC.

View all posts by Jay Padimala
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