Convert PNG to WebP Online Free

Turn heavy PNGs into WebP while keeping the transparent background and cutting a big chunk of the size. Supports batch conversion — select multiple PNGs and download it all as a ZIP. No sign-up, no file upload.

Drag one or more PNG files here

or click to browse — multiple files supported · also accepts JPG, WebP, and BMP by drag-and-drop

Convert to

—

WebP —

Original format

—

Final format

—

Original size

—

Final size

—

PNG or WebP: which one for your site?

PNG solved a real problem when it appeared: storing images with zero loss and a transparent background. The cost was always size — a PNG logo easily passes 300 KB, and it shows up on every page of the site.

WebP delivers the same two features with much smaller files. It has a lossless mode, which produces files about 26% smaller than the equivalent PNG, and a lossy mode, which reduces size even further when some loss is acceptable. In both cases, the alpha channel is preserved, so transparency stays intact.

That’s why converting PNG to WebP is one of the highest-return optimizations for a site: you cut the weight of logos, icons, illustrations, and cropped product photos without changing anything visually. The recommendation is to keep the original PNGs archived — both to serve as a fallback in older browsers and to have a lossless master version for future edits.

Criterion	PNG	WebP
Transparency	Yes	Yes
Size of a typical logo	Reference	About 26% smaller (lossless)
Lossy mode available	No	Yes
Animation	No (APNG only)	Yes
Support in editing software	Universal	Limited
Best for	Editing and archiving	Publishing on websites

Why use this converter?

Total privacy

Conversion happens right in your browser. No file is ever sent to an external server.

Batch conversion

Select dozens of images at once and download them all converted in a single ZIP file.

Instant preview

See the converted image before downloading, with the final size shown in real time.

Works offline

Once the page has loaded once, the tool keeps working even without an internet connection.

How to convert PNG to WebP step by step

The first step is loading your files. Drag the PNG images into the dashed area at the top of the page, or click it to open your system’s file picker, already filtered to show only PNG files. There’s no limit on quantity or size. Since this conversion is usually part of an entire site optimization, the most practical approach is selecting every logo, icon, and illustration from your media folder at once. Conversion starts as soon as the files come in, with no confirmation button.

With a single file, the tool opens in Single image mode and shows a preview of the generated WebP along with four indicators: original format, final format, original size, and final size. If the image has a transparent background, use the preview to confirm it’s still there — WebP normally preserves the alpha channel. With two or more files, the tool automatically switches to Batch mode, with a table showing each image’s name, size before and after, and a status dot that turns green as each conversion finishes.

The target format on this page is already set to WebP, so there’s nothing to configure. For very simple images with few flat colors, the original PNG might already be so efficient that the WebP ends up almost the same size — in those cases it’s worth keeping the PNG, and you just click the matching button above the preview to compare. The switch redoes the conversion instantly, with no page reload or reselecting files. The two buttons at the top of the panel also let you switch manually between single and batch mode.

To finish, download the result. In single mode, use the Download converted image button. In batch mode, the Download all converted (ZIP) button bundles everything into one compressed file, ready to upload to your server. If you only want some of the images, each table row has its own download button and an X to discard that item before generating the ZIP. All conversion happens inside the browser, with no upload to a server.

Frequently asked questions

Does converting PNG to WebP keep the transparent background?

Yes, entirely. WebP supports an alpha channel just like PNG, so logos, icons, and cutouts keep their transparent background after conversion. That’s the big advantage over converting to JPG, which would fill the transparency with white.

How much smaller does the file get when converting PNG to WebP?

The savings are usually significant: around 26% with lossless compression and well beyond that in lossy mode. For logos, icons, and illustrations with transparency, it’s common for a 400 KB PNG to become a 100 to 150 KB WebP. The preview shows the final size before you download.

Is it worth replacing my site’s PNGs with WebP?

In most cases, yes. PNGs with transparency tend to be a site’s heaviest files — header logos, icons, illustrations, and cropped product images. Replacing them all with WebP keeps exactly the same look and the same transparent background, at a fraction of the size. Since these files usually appear on every page, the speed gain multiplies across the whole site and shows up directly in LCP and Core Web Vitals.

What if someone visits the site with a browser that can’t open WebP?

Support today covers over 96% of users: Chrome, Firefox, Edge, and Safari 14 or newer all display WebP normally. For the remaining cases, the recommended practice is using the HTML picture tag, setting WebP as the main source and a PNG as the fallback — the browser then picks whichever it can display on its own. It’s worth keeping the original PNGs instead of discarding them after conversion.

Can I convert several PNG files to WebP at once?

Yes. Drag as many files as you want — the tool automatically switches to batch mode, converts all of them while preserving transparency, and unlocks the ZIP download. Each row in the table shows the size before and after.

WebP or PNG: which should I use for a logo and favicon?

For the logo displayed within the pages, WebP is the best choice: same transparency, a much smaller file, and universal browser support. For favicons the answer changes — the expected format is still .ico or PNG, since it’s the browser and operating system that read that file, not the page. Also keep PNG or SVG as the master logo file, so you always have a lossless version when creating new artwork.

Does the tool work on mobile?

Yes. It works in any modern browser — Android, iPhone, tablet, or computer — no app install needed.