Convert CBZ to BMP — Free Online Converter
Convert Comic Book ZIP (.cbz) to Bitmap Image (.bmp) online for free. Fast, secure image conversion with no watermarks or registration....
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How to Convert
Upload your .cbz file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .bmp file when it's ready.
About CBZ to BMP Conversion
CBZ (Comic Book ZIP) is an open archive format for digital comics that packages sequential page images inside standard ZIP compression. Unlike CBR which relies on proprietary RAR, CBZ uses the universally open ZIP format, making it the preferred choice for open-source comic readers like Calibre, web-based readers, and cross-platform apps like Panels and Kavita. BMP (Bitmap) is Microsoft's uncompressed raster format, storing raw pixel data without any compression.
Converting CBZ to BMP extracts each page image from the ZIP archive and saves it as an uncompressed bitmap file. The open nature of CBZ's ZIP container makes extraction straightforward — no proprietary decompression library is required. The resulting BMP files contain raw pixel data at the source resolution, suitable for editing, printing, and integration into workflows that require uncompressed image input.
Why Convert CBZ to BMP?
BMP's raw, uncompressed pixel data is required by certain industrial and medical imaging pipelines that cannot process compressed formats. When comic-style illustrated instructions, safety diagrams, or training materials stored in CBZ need to enter these systems, BMP provides the universally accepted uncompressed input format. The complete absence of compression ensures no processing overhead during image analysis.
Print-on-demand services and prepress systems sometimes specify BMP as an accepted input format for direct-to-plate imaging. Converting CBZ pages to BMP prepares illustrated content for these specific workflows, particularly in environments running older print management software designed around uncompressed raster input.
Common Use Cases
- Extract CBZ comic pages as uncompressed BMP for import into industrial imaging systems
- Prepare CBZ illustration pages for prepress systems that accept only BMP raster input
- Create uncompressed page masters from CBZ archives for pixel-level quality assurance checks
- Feed CBZ comic pages into legacy Windows applications that only process BMP files
- Generate raw bitmap data from CBZ pages for automated optical character recognition pipelines
How It Works
The conversion uses standard ZIP decompression to extract all image files from the CBZ archive. Pages are identified by their image file extensions (JPEG, PNG, GIF, WebP) and sorted by filename for reading order. Each page is then converted to 24-bit RGB BMP format using ImageMagick, preserving the original pixel dimensions. No color space conversion, resampling, or sharpening is applied. The BMP files use bottom-up row storage (standard Windows bitmap format) with optional padding to align rows to 4-byte boundaries.
Quality & Performance
BMP output contains the exact pixel data from the source with zero compression. If CBZ pages are PNG, the extraction is a format conversion with no quality change. If pages are JPEG, the BMP captures the current pixel state (including any existing JPEG artifacts) without adding any new compression. The output is the highest-fidelity raster representation of the source material. File sizes are large — each page occupies approximately width * height * 3 bytes (24-bit) plus a small header.
Device Compatibility
| Device | CBZ | BMP |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Tips for Best Results
- 1Use PNG instead of BMP if you need lossless quality with reasonable file sizes — BMP is only necessary when uncompressed data is strictly required
- 2Verify disk space before converting — a full comic series in BMP can consume tens of gigabytes
- 3CBZ's open ZIP format means extraction is faster than CBR's RAR decompression on most systems
- 4Consider batch converting only the pages you need rather than entire archives to save time and space
- 5Keep your original CBZ archives as the canonical source — BMP files are working copies
CBZ to BMP extraction produces raw, uncompressed page images from open-standard comic archives. The output is suitable for systems requiring uncompressed input and provides pixel-perfect copies of the source pages.