WebP Converter‪.‬ 4+

Offline Batch WebP Converter

Reiji Kobayashi

    • 4.9 • 164 Ratings
    • Free
    • Offers In-App Purchases



An unlimited Batch converter for HEIC, PNG, JPG (and much more!) to WebP without upgrading.
An Unlimited Batch converter for WebP to PNG (to JPEG is enabled by upgrading).
Add a watermark with converting. (In-App Purchase)

# Easy to Use
You can drag & drop images, folders, and directories from web browsers like safari.
You can output multiple types of images at one time.

# Support Images Type
and more: jp2, j2k, jpc, bmp, jbig, bie, pnm, pgm, pbm, mag.

# Secure
All processes are done on your mac.
You don't need to upload your important images to the Internet.

# In-App Purchase - Quality, Resize, Preview Pack
- Convert WebP to JPEG.
- WebP encoding options. (Lossless, Preset, Method, Keep Color Profile, and Sharp YUV)
- Keep Color Profile.
- Change output WebP quality.
- Resize with maxWidth and maxHeight.
- Preview result.
- Keep the original extension at the filename.
- Adding prefix or suffix at the filename.
※ Lossless may be automatically a little lossy for stable encoding depending on the image.

# In-App Purchase - Unlimited Watermark Image Pack
- No limit to adding a watermark.

# And More!
The dark mode is supported.

※ If you have any requests, please send an E-mail to sonice.d1v1b[-]gmail.com. ([-]→@)
※ Please note that macOS default apps (ex: Finder and Safari) cannot read the correct WebP Color Profile yet.
※ Please restore the purchase after reinstalling the app.
※ Open Help > In-App Purchase to see the detail about In-App Purchase.
※ Please refer https://d1v1b.com/1/termofuse for the Terms of Use.

What’s New

Version 5.2.8

Added the function of in-app purchase.
The user can now select whether or not always to overwrite the watermark.
The watermark insertion timing can now be changed before and after resizing.

Ratings and Reviews

4.9 out of 5
164 Ratings

164 Ratings

BlueTopiary ,

Just get the premium version

I have used a lot of methods to convert to WebP, and this is by far the easiest. This tool (paid version) allows me to set a max width OR height, which is excellent for handling landscape and portrait images in the same batch. Then, there's the auto-start feature which makes moving through the process a breeze, when paired with "save in original image folder". I just drop groups of files in to be optimized and its off to the races. Very quick conversion, and I have also found the compressed image sizes to be smaller than several other tools I have used like Squoosh or WebPShop (Photoshop).

Developer Response ,

Thank you for upgrading and your review.

I'm glad to hear that the app is useful for you.

Mileschauvin ,


Fast with an elegant simple interface. I looked for other products this dev had as well.

w3ak ,


I can't be the only one that finds the WebP format utterly obnoxious. Having such a simple, elegant conversion solution as this is perfect!

Developer Response ,

Thank you for your review!

App Privacy

The developer, Reiji Kobayashi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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