Convert WMZ to BMP — Free Online Converter
Convert Compressed Windows Metafile (.wmz) 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 .wmz 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 WMZ to BMP Conversion
WMZ is a gzip-compressed Windows Metafile — a WMF vector graphics file wrapped in a standard gzip compression layer. Microsoft introduced WMZ as a space-efficient packaging of WMF content, commonly used in Office documents, web pages generated by Microsoft tools, and Windows clipboard exports. Inside the gzip envelope is a standard WMF file containing GDI drawing commands for lines, curves, shapes, text, and embedded bitmaps.
Converting WMZ to BMP involves decompressing the gzip wrapper to extract the underlying WMF, then rasterizing the vector drawing commands into an uncompressed bitmap image. The result is a universally viewable pixel image that works on any operating system and in any application that can display images, eliminating both the compression layer and the Windows-specific GDI command dependency.
Why Convert WMZ to BMP?
WMZ files are doubly inaccessible on non-Windows platforms. First, the gzip compression must be recognized and stripped. Then the underlying WMF format must be interpreted by a GDI-compatible renderer. Most macOS and Linux applications fail at one or both steps. Converting to BMP produces a flat raster image with no platform dependencies, no decompression requirements, and no special rendering engine needed.
BMP is also required by legacy industrial systems, embedded hardware, and scientific instruments that expect uncompressed pixel data as input. If a WMZ graphic needs to reach such a system — for example, a diagram from a Microsoft Office document that must be displayed on an embedded industrial panel — BMP conversion provides the necessary format translation.
Common Use Cases
- Extract and convert compressed WMZ graphics from Microsoft Office documents for cross-platform viewing
- Produce rasterized BMP images from WMZ clip art for legacy industrial display systems
- Create universally viewable bitmap versions of WMZ diagrams from Windows-generated web pages
- Convert WMZ graphics to BMP for import into image processing software that cannot handle metafiles
- Rasterize WMZ vector content for use in non-Windows environments where metafile rendering is unavailable
How It Works
The WMZ file is first decompressed using gzip to extract the embedded WMF content. The WMF is then parsed as a sequence of GDI metafile records — SetWindowOrg, LineTo, Rectangle, Ellipse, TextOut, StretchDIBits, and other GDI primitives. ImageMagick or LibreOffice renders these drawing commands onto a raster canvas at the specified DPI resolution. The output BMP uses 24-bit RGB color depth with BI_RGB (no compression), producing a predictable file size of width x height x 3 bytes plus headers.
Quality & Performance
The rasterization quality depends on the output DPI setting. Vector elements like text, lines, and curves render sharply at high DPI (300+), while lower DPI (72-96) is suitable for screen viewing. Since the WMZ source is vector-based, there is no inherent resolution limit — you choose the output quality. BMP's uncompressed format introduces zero compression artifacts. Alpha transparency from the WMZ source is composited against a white background.
Device Compatibility
| Device | WMZ | 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 300 DPI for print output and 150 DPI for screen-quality rasterization
- 2Consider PNG instead of BMP for the same lossless quality at much smaller file sizes
- 3Check for transparency in the WMZ source — BMP will flatten it to white, while PNG preserves it
- 4Batch convert WMZ files extracted from Office documents in a single operation
- 5Test font rendering on sample files first — WMZ text uses Windows fonts that may be substituted on the server
WMZ to BMP converts gzip-compressed Windows Metafile graphics into universally viewable uncompressed images, removing both the compression envelope and the Windows-specific rendering dependency in a single step.