How to Bulk Convert Images to WebP (100 at a Time, No Upload)

The problem with most batch converters

• Upload-based tools cap you at 10–20 files, throttle speed, and hold your images on their servers.
• Desktop apps need installing, updating, and often cost more than an online plan.
• Command-line tools like cwebp are excellent but intimidating for non-developers.
• CMS plugins run on your server and time out on shared hosting.

Batch conversion in the browser

Fast WebP Converter Pro processes up to 100 images per batch directly on your device. Because nothing is uploaded, there is no queue and no file size limit beyond your computer's memory. A batch of 100 photos typically completes in 10–30 seconds, and the results download as a single ZIP archive.

Step by step

1. Open the converter and drop a folder's worth of images (up to 100).
2. Set quality once: 80 for photos, 90 for graphics.
3. Set a maximum width, e.g. 2000 px for full-width images or 1200 px for blog content.
4. Click Convert. The whole batch is encoded locally. You see the total weight saved and can download the first image free.
5. Go Pro to unlock every remaining file as a ZIP, already converted at the same quality.

For developers: the command-line alternative

If you prefer scripting, Google's libwebp ships cwebp. On macOS: brew install webp, then for f in *.png; do cwebp -q 80 "$f" -o "${f%.png}.webp"; done. It produces identical results to the browser encoder, without the drag-and-drop convenience or the automatic resizing.