A small, fast, offline image converter for Windows. Drag files in, pick a format, done.
ImgConvert batch-converts images between JPEG/JPG, PNG, WebP, GIF, TIFF/TIF, and HEIC/HEIF. It was built around a simple idea: a tool this small shouldn't come with an installer, an account, a subscription, or a network connection.
- Lightweight — a single portable
.exe(~21 MB), no installer, no admin rights, no dependencies to set up. - Open source — MIT licensed. Read every line, fork it, change it.
- Ad-free — no ads, no upsells, no "Pro" tier.
- Doesn't phone home — no telemetry, no analytics, no update-checker pinging a server. It never makes a network request. Your images stay on your machine.
- Batch convert between JPEG/JPG, PNG, WebP, GIF, TIFF/TIF, and HEIC/HEIF
- Drag and drop files or folders, or paste a path directly
- Windows Explorer right-click Convert To menu, per format, output next to the original file
- Automatic EXIF-orientation correction (fixes sideways/upside-down phone photos)
- Progress bar and a per-file success/failure log
- Light and dark theme toggle
- Code-signed executable
Grab the latest Windows exe from the Releases page — no Python install needed.
A winget package (248Tech.ImgConvert) is pending review — once merged, you'll be able to run winget install 248Tech.ImgConvert. Track status: PR #426950.
pip install -r requirements.txt
python imgconvert.py
tkinterdnd2 is optional — if it's missing, the app still works, you just use the "Add Files…" / "Add Folder…" buttons instead of drag-and-drop.
- Drag files/folders onto the window, click "Add Files…" / "Add Folder…", or paste a path directly.
- Pick the target format from the dropdown.
- Pick an output folder (defaults to a
converted/subfolder next to the first file). - Click Convert.
Files that fail to convert (not an image, corrupt, etc.) are skipped and listed in the log — the rest of the batch still runs.
Click "Add Right-Click Menu" in the app's header to add a Convert To submenu (JPEG, PNG, WebP, GIF, HEIC, TIFF) to the Explorer right-click menu for supported image files. Pick a format and the converted file is written right next to the original — no need to open the app.
This writes only to HKEY_CURRENT_USER, so it applies to your Windows account and doesn't need admin rights. To remove it, run ImgConvert.exe --uninstall-context-menu.
The exe is signed with a self-signed certificate — not one issued by a public CA, since that costs money and requires business identity verification. Its public half is embedded in the app itself (the private key never leaves the dev machine).
On a new PC, Windows will still show the SmartScreen warning once — click "More info" > "Run anyway". Then click "Trust This App" in the app's header: it silently imports the embedded public cert into that Windows account's Trusted Root + Trusted Publisher stores (no admin needed). After that, this exe — and any future release signed with the same key — won't be flagged on that account again.
Issues and pull requests are welcome. The codebase is a single file (imgconvert.py) by design — it's meant to stay small and easy to read end to end.
If you're building from source and want a signed exe, it must be re-signed every time it's rebuilt (PyInstaller output isn't signed by default):
$pfxPath = "signing\imgconvert_signing.pfx"
$plainPassword = Get-Content "signing\pfx_password.txt" -Raw
$securePassword = ConvertTo-SecureString -String $plainPassword -Force -AsPlainText
$cert = Get-PfxCertificate -FilePath $pfxPath -Password $securePassword
Set-AuthenticodeSignature -FilePath "dist\ImgConvert.exe" -Certificate $cert -TimestampServer "http://timestamp.digicert.com" -HashAlgorithm SHA256MIT — free to use, modify, and redistribute.