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https://github.com/rene78/batch-convert-to-webp

A simple script to convert all image files in a folder to the modern .webp format
https://github.com/rene78/batch-convert-to-webp

batch-conversion batch-converter image-conversion image-converter jpg-to-webp png-to-webp tiff-to-webp webp

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A simple script to convert all image files in a folder to the modern .webp format

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# Batch convert to .webp

The script in this repository converts all images within a designated folder into the contemporary WebP format. No need to install software or upload your images to potentially dodgy conversion websites.



## How to use



Windows



Windows does not natively support the execution of shell scripts. One way to run the script below is to install [Git](https://git-scm.com/) on your computer. Other options are highlighted in [this Stack Overflow thread](https://stackoverflow.com/questions/26522789/how-to-run-sh-on-windows-command-prompt).



1. Download the ***convert.sh*** script and the ***cwebp*** executable files.



    [convert.sh](https://rene78.github.io/batch-convert-to-webp/convert.sh)



    [cwebp (1.4.0-windows-x64)](https://rene78.github.io/batch-convert-to-webp/cwebp.exe)



2. Copy those 2 files to the folder with the images that you want to convert to _.webp_.

3. Open Git Bash by pressing the Windows key and typing `git bash`

4. Navigate to your image folder:



    `cd link/to/your/image/folder`



5. Start the batch convert process by typing the following command in the terminal window:

    `sh convert.sh`



6. All _.webp_ files will be saved in a subfolder called ***webp***.



macOS



1. Download the ***convert.sh*** script and the ***cwebp*** executable files.



    [convert.sh](https://rene78.github.io/batch-convert-to-webp/convert.sh)



    [cwebp (1.4.0-mac-arm64)](https://rene78.github.io/batch-convert-to-webp/cwebp)



2. Copy those 2 files to the folder with the images that you want to convert to _.webp_.

3. Right-click on this image folder and select `New Terminal at Folder`



    ![Picture of App][screenshot]

    

    [screenshot]: img/Screenshot_RMB_Open_Terminal.png "Select 'New Terminal at Folder'"



5. Start the batch convert process by typing the following command in the terminal window:

    `sh convert.sh`



6. All _.webp_ files will be saved in a subfolder called ***webp***.



## Notes

- The script is based on a [Stack Overflow answer](https://stackoverflow.com/a/26565210/5263954) with some minor additions. Thanks InfinitePrime!

- It works with jpg, png and tiff files.

- I have tested it on Mac and Windows 10. If there are issues on Linux machines with the script please report back.

- You can change the quality level of the converted image file. Go to `convert.sh` and change the number on line 6. 80 is the default value. Higher means better image quality but larger file sizes.

- `cwebp` was copied from Google's [libwebp codec distribution](https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html), version 1.4.0. You might want to update to a later version or use a different one, e.g. for Linux or pre Silicon Macs. The cwebp executable is saved in the /bin folder.

- If you want something a little more user friendly with an UI I would recommend [webp2jpg-online](https://github.com/renzhezhilu/webp2jpg-online), a web app that converts your images locally. You can use the the tool completely offline by downloading the html files in the ["offline" folder](https://github.com/renzhezhilu/webp2jpg-online/tree/master/offline).