Convert whole folders of images and PDFs to JPG, PNG, WEBP, AVIF and 100+ other formats in one go, and turn any picture into a crisp, multi-size Windows icon.
A free, open-source desktop app for Windows. It works offline, and your files never leave your computer.
English · Tiếng Việt
Converter
- 📂 Whole folders at once. Drop in files or folders (subfolders included) and convert everything to JPG, PNG, WEBP, AVIF, TIFF, GIF, ICO, PDF or 100+ other formats.
- 📱 iPhone photos too. HEIC/HEIF, WEBP, AVIF, RAW camera files, PSD, SVG and more can be read and turned into everyday JPG or PNG.
- 📄 PDF to images. Every page becomes its own image, at the resolution you pick (72 to 600 DPI).
- 🛡️ Your originals stay safe. Results go into a subfolder by default. If you choose to replace the originals, a file is only removed after its new version has been written.
- ⚡ Fast. Several files are converted side by side, tuned to your CPU and memory, and you can stop at any moment.
ICO Maker
- 📋 Paste and go. Copy a picture from anywhere (a screenshot, an image in your browser, a file in Explorer) and press Ctrl+V. It shows up right away, ready to export.
- 🔍 Sharp at every size. Each size, from 16 px up to 256 px, is resized on its own with high-quality filters and a touch of sharpening, so small icons stay crisp instead of blurry or jagged.
- ✂️ Frame it your way. Drag to move, scroll to zoom, and round the corners anywhere from square to a full circle. Add padding, a background color or a border if you like.
- 🧩 Every ICO flavor. BMP 32-bit with transparency, PNG, BMP 24-bit, 8-bit (256 colors) and 4-bit (16 colors), with presets for Windows apps and website favicons, plus any custom size up to 1024 px.
And: English and Vietnamese, a calm dark theme, a layout that fits small windows, no ads, no account and no tracking.
- Open the latest release.
- Pick one:
ImageStudio-Setup-x.y.z.exeis the installer, and the easy choice. It adds Start menu and desktop shortcuts and doesn't need admin rights.ImageStudio-Portable-x.y.z-win-x64.zipis the portable version. Unzip it anywhere (a USB stick works too) and runImage Studio.exe.
- Open it. If a blue "Windows protected your PC" box appears, click More info → Run anyway. (Why does this happen?)
ImageMagick, the engine behind the converter, is built in, so there's nothing else to install. Only PDF files need one extra free program (see PDF files).
To uninstall, go to Windows Settings → Apps → Image Studio.
Yes. The blue box only means the app is new and isn't code-signed yet (a signing certificate costs money every year). It is not a virus warning.
Want to check for yourself?
- Every download is built automatically by GitHub from the source code you can read here, not on someone's PC. You can follow each build under Actions.
- The app doesn't send your pictures or anything else anywhere. It only goes online when you click Check for updates (it asks GitHub for the newest version number) or one of its links.
- Please download Image Studio only from this GitHub page. Copies on other sites may have been changed.
- Open Converter and drop files or folders onto the window, or click Add files / Add folder.
- Pick a format in Convert to.
- Choose where the results go:
- Into a subfolder (default): a
converted-imagesfolder next to the originals. The originals aren't touched. - Replace originals: the results are saved next to the originals, and each original is deleted once its new version is written.
- Into a subfolder (default): a
- Click Convert. You can click Stop at any time; files that were in progress are cleaned up, so nothing is left half-written. When it's done, Open folder shows the results.
In Advanced:
- Quality: Lossless keeps every pixel when the format allows it (PNG, TIFF, WEBP, AVIF, JXL), with larger files. Max quality uses the highest quality setting with normal compression, with smaller files. JPEG always uses its best quality.
- PDF: the resolution for PDF pages: 72, 150, 300 or 600 DPI. 300 DPI suits most documents.
- Subfolder: the name of the results folder.
- Folder filter: when you add a folder, only take files of one format (for example only HEIC photos). Files you add one by one are always included.
To read PDFs, ImageMagick needs Ghostscript, a free program that can't be bundled with this app for license reasons. If it's missing, Image Studio tells you and links to the Ghostscript download page. Install the 64-bit version, then try again. Each page becomes its own image; with Replace originals, the pages go into a folder named after the PDF.
- Copy a picture and press Ctrl+V in ICO Maker. You can also drag a picture into the window or click Open image.
- Drag the picture to frame it and scroll to zoom. Move the slider from Square to Round for rounded corners.
- Click Export ICO and choose where to save it.
A few handy things:
- Double-click the preview to reset the framing. The arrow keys nudge the picture, and + / – zoom.
- Click a size in the strip under the slider to see it enlarged pixel by pixel. Click it again to go back.
- The three dots under the preview switch its background (checkerboard, light, dark), so you can check how the icon looks on light and dark taskbars.
- Pasting something that isn't a picture, such as plain text, does nothing, so you never lose your work by accident.
- Pasting the path of an image file (for example
C:\Pictures\logo.png) opens that file.
| Format | Good for |
|---|---|
| BMP 32-bit (default) | Windows apps, shortcuts and folders. Full transparency, works everywhere. |
| PNG 32-bit | Smaller files. Works on Windows Vista and newer and in web browsers. |
| BMP 24-bit | Old programs that don't understand transparency. Edges are hard, not soft. |
| BMP 8-bit · 256 colors, 4-bit · 16 colors | Very old systems, or a retro look. |
Sizes above 256 px are always stored as PNG, because that's the only way the ICO format allows them.
Click Advanced to open the side panel:
- Image: rotate, flip, or reset the framing.
- Corners: Circular gives classic rounded corners; Smooth gives softer, app-style corners.
- Padding: empty space between the picture and the edge of the icon.
- Fill and Border: a solid background (handy for pictures with transparent parts) or an outline.
- Filter: how the picture is shrunk. Mitchell is smooth (the default); Magic Kernel Sharp is crisper.
- Sharpen: extra sharpening for small sizes. 100% is automatic; 0% turns it off.
- Upscale: when the picture is smaller than the icon, enlarge it smoothly, or Keep pixels for pixel art.
- Sizes: presets (Full set, Windows, Favicon). Click a size to turn it on or off, or type your own.
- Also save a PNG of each size: writes a folder of PNG files next to the .ico.
Can it convert iPhone photos (HEIC) to JPG? Yes. Drop the photos or their folder into Converter, pick JPEG in Convert to and click Convert.
Does it need the internet? No. Everything happens on your computer. The only online feature is Check for updates, and it runs only when you click it.
Where are my settings saved?
In %APPDATA%\image-studio. Deleting that folder resets the app to its defaults.
Can I use the icons I make in my own projects, even commercial ones? Yes. What you make with Image Studio is yours. The app's license covers only the app's own code.
How do I switch the language? Use the EN / VI switch at the bottom left. The app remembers your choice.
Something doesn't work. Please open an issue with what you did and, if you can, a screenshot. The app version is shown at the bottom left (click it for About).
Image Studio is free, and it's going to stay that way. If it saved you some time, maybe chip in a little for my instant noodles 😽:
There's also a pink Support me button in the app, at the bottom left. Thank you so much ❤️ Other ways to help:
- ⭐ Give the project a star. It helps other people find it.
- 🐛 Tell me about bugs or ideas in Issues.
Build from source
You need Windows 10/11 and Node.js 22 or newer. For the PDF tests, install Ghostscript too.
git clone https://github.com/nyankuro/image-studio.git
cd image-studio
npm ci
npm run fetch:magick # downloads the pinned portable ImageMagick into vendor/
npm run dev # run with live reload
npm test # unit and conversion tests, then the Electron UI smoke tests
npm run package # build release/win-unpacked and put a shortcut on the desktop
npm run dist # build the installer and portable zip into release/npm run fetch:magick checks the SHA-256 of the download and keeps only magick.exe and the files it needs (about 32 MB). Without it, the app falls back to a magick command on your PATH.
Project layout: electron/ (main process: ImageMagick, conversion queue, clipboard, update check), src/ (React interface; src/lib/ holds the icon resampling, ICO encoder and color quantizer), locales/ (English and Vietnamese text), tests/, scripts/ (ImageMagick download, desktop shortcut).
To release a new version, update version in package.json and CHANGELOG.md, write the release notes in docs/release-notes/vX.Y.Z.md, then push a tag such as v1.0.2 or click Run workflow on the release workflow in the Actions tab. GitHub Actions runs the tests, builds the installer and the portable zip, and publishes them as a GitHub Release with those notes and the SHA-256 checksums.
To add a language, copy locales/en.json, translate the values, and register it in src/i18n.jsx and electron/i18n.cjs.
© 2026 nyankuro. Image Studio is free and open source under the GNU General Public License v3.0 or later. In plain words:
- ✅ You can use it for free, at home or at work, share it, and change it.
- 🔓 If you share a changed or rebranded copy (even for money), you must keep it under the same license, publish its source code and keep the original credits.
Powered by ImageMagick (ImageMagick License), bundled unmodified. Other parts keep their own licenses; see THIRD_PARTY_NOTICES.md. Inspired by the handy online tools at RedKetchup.
Made with ❤️ by nyankuro 🐈⬛