A fast, free and beginner-friendly Windows image converter that turns PNG, JPG, JPEG and AVIF files into modern WebP or AVIF formats with just a few clicks.
Perfect for web developers, designers, photographers and anyone who wants smaller, faster-loading images.
If you have any problems or need help, feel free to contact me — happy to assist! 😊
This tool helps you reduce the size of your images without losing noticeable quality.
- Websites load much faster
- Images take up far less space
- Perfect for uploading galleries or sharing images
- No technical knowledge required
This tool uses ImageMagick as the “engine” in the background:
➡️ ImageMagick = the powerful engine
➡️ This program = the easy click-and-go interface
Without ImageMagick, the program cannot convert the images.
It is safe, free, and widely used by professionals.
Download ImageMagick here:
https://imagemagick.org/script/download.php
(Enable “Install legacy utilities” during installation.)
- Install ImageMagick
- Download the EXE version from Releases:
https://github.com/martonalpha/png-jpg-jpeg-to-webp-avif-gui/releases - Open the EXE
- Choose your folder
- Select WebP or AVIF
- Press Start conversion
The app automatically converts all images in the folder (and subfolders, if enabled).
Click:
More info → Run anyway
(This happens because the app is new and unsigned.)
This tool is a PowerShell-based GUI wrapper around ImageMagick’s magick binary, offering:
- PNG/JPG/JPEG/AVIF → WebP/AVIF
- Quality parameter (0–100)
- Auto-orientation (fixes rotated photos)
- Optional recursive traversal
- Optional cleanup of originals
- Detailed logging
Ideal for web optimisation workflows and batch image processing.
- Supports PNG, JPG, JPEG, AVIF
- Outputs WebP or AVIF
- Batch conversion
- Recursive folder support
- Adjustable quality (0–100)
- Auto-orientation
- Optional deletion of originals
- AVIF → WebP support
- Detailed log output
- Runs entirely offline
👉 Latest Release:
https://github.com/martonalpha/png-jpg-jpeg-to-webp-avif-gui/releases
Simply download the EXE, install ImageMagick once, and you’re ready.
- Windows 10 or 11
- PowerShell
- ImageMagick installed
During ImageMagick installation, turn on:
Install legacy utilities (e.g. convert)
If you prefer running the .ps1 script:
- Install ImageMagick
- Download the repository
- If PowerShell blocks scripts, run:
Set-ExecutionPolicy RemoteSigned- Launch:
.\image-converter-gui.ps1- Quality 85 is ideal for websites
- WebP/AVIF can reduce file sizes by 60–90%
- Everything runs locally — your images stay private
- Deleting originals is optional
If you have questions, issues or suggestions,
please contact me — I’m happy to help! 😊
MIT License