A fast, simple image converter for people tired of sketchy online converters that ask for your email, watermark your output, or limit you to 3 free conversions — and who also don't want to memorize imagemagick flags in a terminal.
I built this because my wife kept asking me to convert photos for her — resize something, change the format, adjust proportions. She doesn't care about ffmpeg flags or imagemagick pipelines, she just wants to drag files in and get the result. So I wrote a proper desktop app that handles it.
It's built with Rust (Tauri v2) and React, runs natively on macOS, Linux, and Windows, and is genuinely fast — not "fast for an Electron app" fast, but actual native-library fast.
Grab the latest release for your platform from the Releases page:
| Platform | Format |
|---|---|
| Windows | .msi / .exe |
| macOS | .dmg |
| Linux | .deb / .AppImage |
Or build from source (see below).
macOS note: The app is not code-signed with an Apple Developer certificate, so macOS will block it on first launch. To fix this, run:
xattr -cr /Applications/Converto.appAlternatively: open the app once (it will show a warning), then go to System Settings → Privacy & Security and click Open Anyway.
- Drag & drop — drop one or many files, they show up with thumbnails
- Batch conversion — convert dozens of images at once, processed in parallel
- Format support — JPEG, PNG, WebP, AVIF, HEIC/HEVC, BMP, TIFF, GIF, ICO
- Quality control — adjust output quality for lossy formats
- Resize — set target width/height
- Aspect ratio — crop to common ratios (16:9, 4:3, 1:1, etc.)
- EXIF preservation — keep or strip metadata
- Output directory — choose where converted files land
- Themes — four built-in dark themes (see below)
The image crate in Rust is fine for basic work, but it leaves a lot of performance on the table for common formats. Converto uses dedicated native libraries where they make a real difference:
| Format | Library | What it does |
|---|---|---|
| JPEG | turbojpeg (libjpeg-turbo) | SIMD-accelerated JPEG decode/encode. 2-4x faster than pure Rust |
| WebP | libwebp | Google's native WebP encoder. Supports lossy mode (the image crate only does lossless) |
| AVIF | ravif (rav1e) | Direct rav1e bindings with speed tuning — ~10x faster than image crate defaults |
| HEIC | libheif-rs | Native HEIF/HEVC decode and encode |
| Everything else | image | PNG, BMP, TIFF, GIF, ICO — the standard Rust image library |
Batch conversions run in parallel via rayon, and the encoder avoids unnecessary pixel buffer copies using zero-copy borrows when the image is already in the right color format.
Four dark themes, switchable from the UI:
- Aurora — indigo/purple (default)
- Catppuccin Mocha — mauve/pink
- Dracula — purple/cyan
- Nord — frost blue
Implemented with CSS custom properties and a [data-theme] attribute, stored in Zustand so your choice persists.
- Node.js (18+)
- Rust (stable)
- Tauri CLI
- System libs for HEIC/JPEG:
cmake,nasm,libheif-dev(or equivalent for your OS)
git clone https://github.com/escees/converto.git
cd converto
npm install
npm run tauri dev # development
npm run tauri build # production buildThe production build outputs platform-specific installers in src-tauri/target/release/bundle/.
| Layer | Tech |
|---|---|
| Desktop framework | Tauri v2 |
| Backend | Rust |
| Frontend | React 18 + TypeScript |
| Styling | Tailwind CSS |
| State | Zustand |
| Build | Vite |
MIT