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AnyResizer

PNG to WebP — shrink PNG files for the web, keep transparency

Drop your PNGs and get smaller WebP files that still hold their transparent areas. Choose lossy for the biggest savings or lossless for a pixel-exact copy. No signup, no watermark.

Drop PNGs to convert to WebP

PNG · up to 50 files · 100 MB each

  • Free
  • Instant
  • No signup

How to convert PNG to WebP in three steps

  1. Drop your PNGs

    Add a single PNG or a batch of up to fifty. Each one joins the queue with the same settings until you change them.

  2. Choose lossy or lossless

    Leave it on lossy WebP at quality 80 for the biggest savings, or switch on lossless for an exact copy. Transparency is kept in both.

  3. Download your WebP

    A single file saves on its own. A batch downloads as one ZIP, every image renamed with a .webp extension.

Why WebP beats PNG on the web

PNG stores every pixel exactly, which is great for crisp graphics but rough on file size. A single hero image or a screen full of icons can weigh megabytes, and that weight is the first thing a visitor waits on. WebP was built to fix that. It squeezes the same picture into a much smaller file, and it keeps the one thing you care about most in a PNG: the transparent background. Convert your PNGs to WebP and your pages get lighter without losing the see-through edges.

WebP gives you two ways to do it, and AnyResizer lets you pick. Lossy WebP is the default at quality 80 — it drops detail your eye rarely notices and gives you the biggest size cut, often a fraction of the PNG. Lossless WebP flips a toggle and stores a pixel-exact copy that is still smaller than the original PNG, which suits flat logos, line art, and anything with hard text. Both modes carry the alpha channel forward, so transparent PNGs stay transparent either way.

Everything runs on your own machine. Drop one PNG and the WebP saves straight to your device; drop fifty and they come back as a single ZIP with clean .webp names. Your files stay on your device, nothing is stored on a server, and if one file in a batch is broken it gets skipped while the rest finish.

Features

Two modes, your call

Lossy at quality 80 for the smallest files, or flip to lossless for a pixel-exact copy. Both keep the file smaller than PNG.

Transparency comes along

WebP supports an alpha channel, so the transparent parts of your PNG stay transparent. No flattening, no white box behind the image.

Runs in your browser

The PNG is decoded and re-encoded on your device with WebAssembly. Open the Network tab while you convert and you will see nothing leave.

Made for PNG-to-WebP, alpha and all

  • Lossy quality 80 by default — a big drop in size for typical images
  • Lossless toggle for a pixel-exact copy that still beats PNG on size
  • Transparent pixels survive the conversion in both modes
  • One broken PNG is skipped so the rest of the batch still finishes

When converting PNG to WebP helps

Website and blog images

Swap heavy PNGs for WebP and every page loads with less to download. Same picture, same transparency, far fewer bytes.

Faster page speed and Core Web Vitals

Image weight is often the biggest drag on load time. Lighter WebP files help your Largest Contentful Paint and your scores.

App and UI assets

Icons, sprites, and interface art ship smaller as WebP while keeping the transparent edges your layout depends on.

Emailing smaller files

A WebP is often a fraction of the PNG, so it slips under attachment limits and reaches modern mail clients without trouble.

Saving storage and bandwidth

Convert a folder of PNGs in one batch and reclaim space on disk. Smaller files also mean less bandwidth every time they load.

E-commerce product images

Product shots with cut-out backgrounds convert to WebP with the transparency intact, and lighter images speed up your catalog.

Tips for clean PNG-to-WebP conversions

  1. Tip 1:

    Keep lossy at quality 80 for photos and screenshots. Push it higher only if you spot soft edges you want to sharpen.

  2. Tip 2:

    For flat logos, icons, and images with hard text, turn on lossless — it stays exact and is still smaller than the PNG.

  3. Tip 3:

    Everything stays on your device. No file is uploaded, so even sensitive graphics never touch a server.

  4. Tip 4:

    If a program or an old browser cannot open the WebP, convert it back with WebP to PNG — nothing is lost from a lossless file.

PNG to WebP — frequently asked

How do I convert PNG to WebP?

Drop your PNG onto the dropzone. Leave the default lossy setting for the smallest file, or switch on lossless for a pixel-exact copy, then click Convert. The WebP downloads straight from your device, with no signup and no watermark.

Does WebP keep the transparency from my PNG?

Yes. WebP supports an alpha channel, so every transparent pixel in your PNG carries over. Whether you pick lossy or lossless, the see-through areas stay see-through — there is no fill color to choose and no background baked in.

What is the difference between lossy and lossless WebP?

Lossy WebP, the default at quality 80, drops fine detail your eye rarely catches and gives you the biggest size cut. Lossless WebP stores an exact copy of every pixel and is still smaller than the source PNG. Use lossy for photos and busy images, lossless for flat graphics and hard text.

How much smaller will the WebP be?

It depends on the image. Lossy WebP is often a fraction of the PNG for photographic content, while lossless WebP typically trims a smaller but real amount off a flat graphic. Either way, the WebP should come out lighter than the PNG you started with.

Does converting to WebP lose quality?

Lossless WebP loses nothing — it is a pixel-exact copy. Lossy WebP re-compresses the image once, and at quality 80 the change is hard to spot on most pictures. To keep things clean, convert a given file once rather than looping it through several formats.

What if a program or browser won't open my WebP?

Most current browsers and editors read WebP fine, but a few older programs and very old browsers still cannot. If a recipient hits that, convert the file back with WebP to PNG. A lossless WebP restores exactly, so nothing is lost in the round trip.

Are my PNG files uploaded to a server?

No. Each PNG is decoded and re-encoded inside your browser with WebAssembly. Your file never leaves your device, and nothing is stored anywhere. You can confirm it by opening the Network tab in your browser's developer tools while you convert.

Can I convert several PNG files at once?

Yes. Drop up to 50 PNGs in one go, each up to 100 MB. They all convert with the same mode and quality unless you change a file individually, and the results arrive as a single ZIP with .webp filenames. If one file is broken it is skipped so the rest still finish.

Related image tools

Image Converter (hub)

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JPG to WebP

Have photos instead? Turn JPG files into smaller WebP the same way.

WebP to PNG

Need PNG back? Revert a WebP to PNG when something can't open it.

Image Compressor

Squeeze files smaller with a quality slider and see the size before you save.

Image Resizer

Resize by exact pixels, percentage, or longest edge — before or after converting.

Got heavy PNGs slowing your pages?

Drop them here, pick lossy or lossless, and download smaller WebP files that keep their transparency.

Start converting