Bitify is not a generic BMP converter. It is a reconstruction tool for tiny PNG assets that must survive in BMP pipelines where transparency is effectively binary and semi-transparent edge pixels cause blur, fringe, or broken borders.
A normal converter only changes the file container. Bitify rebuilds the image for restricted BMP consumers by analyzing antialiased PNG edges, recovering structure that would otherwise disappear, correcting edge colors, and exporting a BMP whose alpha is strictly 0 or 255.
Small UI icons such as 24 x 24 assets often rely on semi-transparent edge pixels to make thin borders and diagonal strokes look smooth in PNG. That works in modern renderers, but many BMP-based or legacy consumers do not handle partial alpha correctly.
In those environments, a naive PNG-to-BMP conversion usually fails in one of these ways:
- soft edges turn into blur
- thin borders collapse or disappear
- antialias colors bleed into nearby pixels
- blue, gray, or shadow tones spread into transparent areas
- manually duplicated layers look better than automatic export
Bitify was built specifically to solve that class of problem.
- It targets binary-alpha output, not generic image conversion.
- It is tuned for very small icons where a single pixel changes the shape.
- It tries to preserve thin outlines and bridges instead of simply thresholding alpha.
- It repairs edge colors after binarization so surviving pixels do not inherit dirty fringe colors.
- It exports a BMP that is predictable for consumers that only tolerate fully off or fully on transparency.
Bitify runs a small reconstruction pipeline in the browser before encoding BMP output.
The pipeline does not start from a hard 128 cutoff alone. It lowers the initial seed threshold based on the recovery strength so medium-alpha pixels can still participate when they are likely part of a real border or stroke.
After seeding, Bitify looks for candidate pixels that connect two opaque regions across horizontal, vertical, or diagonal directions. This helps recover thin borders, corners, and diagonal links that a naive threshold would erase.
Once the binary mask is decided, Bitify replaces unreliable edge colors by sampling nearby opaque source pixels. This reduces halo artifacts such as blue spill, gray fringe, and dark outlines caused by PNG antialiasing against transparency.
The final export uses a 32-bit BMP V5 layout with BGRA channels, but the alpha channel is clamped to binary values only: 0 or 255. That makes the output suitable for workflows that break when intermediate alpha values are present.
- Batch PNG upload with drag and drop
- Live original vs processed preview
- Adjustable alpha threshold and recovery strength
- Individual BMP download
- ZIP export with individual BMP files and a horizontal tile sheet BMP
- Fully local processing in the browser
- Optional Electron wrapper for portable Windows packaging
Bitify is a good fit when:
- your source assets are tiny icons or pixel-adjacent UI graphics
- the target program mishandles semi-transparent BMP edges
- a normal BMP export looks softer than the source PNG
- thin borders or corners vanish during conversion
It is not meant to replace a general-purpose image converter for photos or large illustrations.
- React
- Vite
- Tailwind CSS
- TypeScript
- Canvas-based pixel processing
- Electron for desktop packaging
- electron-builder for Windows portable output
Bitify can also be packaged as a portable Windows .exe, so end users do not need to install Node.js.
Run the desktop shell in development:
npm install
npm run dev:electronBuild a portable executable:
npm run dist:portableThe packaged app is written to release/.
Run the browser version locally:
npm install
npm run devOpen the local Vite URL in your browser, add PNG files, tune the conversion sliders, and download the BMP results.
npm run dev
npm run dev:electron
npm run build
npm run build:electron
npm run dist:portable
npm run test
npm run previewISC