How to Convert PNG and JPG to WebP in Bulk (Windows & Mac)

Multi PDF Converter is a desktop app for Windows and macOS that converts between PDF, JPG, PNG, HEIC and WebP on your computer. To make WebP, pick WebP as the output, drop in your images or a whole folder, and convert. It's the right pick when you convert images regularly, when some of your files are PDFs or iPhone HEIC photos, or when you want the results written straight to a folder instead of downloaded.

Step 1: Download Multi PDF Converter

The conversion runs on your own machine. Download the free trial for Windows 10 or 11 (64-bit), or for macOS 13 or later on Apple silicon and Intel Macs, and try it on your own images before you buy.

Step 2: Choose WebP as the output

At the top of the window, Multi PDF Converter reads Convert to [JPG] [PNG] [WebP] [PDF]. Click WebP. The app remembers your choice for next time.

Step 3: Add your images or a whole folder

Drag your PNG and JPG files, or a whole folder of them, onto Drop files or folders here. Folders are added with everything inside, subfolders included. You can also click Click here to choose files, and Add Files once some are listed. Mixed file types are fine. Any image that is already WebP is greyed out and skipped.

Step 4: Click Convert to WebP

Click Convert to WebP and choose where to save. The WebP files go into a Converted Files folder inside the folder you pick, so nothing is overwritten. If two images share a name, the second is saved with " (2)" added.

Step 5: Use your WebP images

Each image becomes a WebP file with the same name, ready to upload. Transparent PNG backgrounds stay transparent. Camera details such as the date and location aren't copied into the WebP files, which is usually what you want on a website. Your original JPG and PNG files are left as they were.

PDFs too: drop a PDF in the same run and every page becomes a WebP image. When a PDF is listed, an Image quality (DPI) slider appears for the page resolution: 150 DPI by default, from 50 up to 354.

Download Multi PDF Converter Free Trial

If you'd rather not install anything, or you want to tune the result, use Squeeze, Essex's free image compressor. It runs entirely in your browser: your images are processed on your own computer and nothing is uploaded. Choose files or a whole folder, set Output format to All to WebP, move the WebP quality slider until you're happy with the size, and download everything as a ZIP.

Squoosh is a free web app from Google that converts one image at a time in your browser. It shows the original and the WebP result side by side, with every encoder setting, which makes it a good way to see what a given quality looks like before you convert a whole batch another way.

Google's free cwebp encoder, part of the libwebp package, converts PNG and JPG to WebP from a terminal. On a Mac, install it with Homebrew (brew install webp); on Windows, download the libwebp tools from Google's WebP developer site. Then, in the folder with your images, one line converts them all. The -q option sets the quality from 0 to 100.

macOS or Linux (Terminal):

for f in *.png *.jpg; do cwebp -q 80 "$f" -o "${f%.*}.webp"; done

Windows (PowerShell):

Get-ChildItem -Path .\* -Include *.png,*.jpg | ForEach-Object { cwebp -q 80 $_.FullName -o "$($_.DirectoryName)\$($_.BaseName).webp" }

If you already edit images in them, recent versions of Adobe Photoshop can save a copy as WebP (File → Save a Copy, then choose WebP), and GIMP exports WebP through File → Export As with a .webp file name. Both work one image at a time unless you set up actions, scripts or plugins.