WMZ to ICO Converter

Turn WMZ data into ICO images — browser-based

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Private & Secure

Security comes first — WMZ files are deleted post-conversion, and ICO output is cleared within 24 hours.

Fully Browser-Based

Everything happens in your browser tab. No downloads, no extensions — just a clean WMZ to ICO conversion workflow.

Works on Any Device

No platform restrictions. Desktop, laptop, tablet, or phone — Convertio handles WMZ to ICO conversion everywhere.

How to convert WMZ to ICO

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose ico or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your ico file right afterwards

About formats

WMZ is a compressed variant of the Windows Metafile (WMF) format, introduced by Microsoft with Office 2000 in 1999. A WMZ file is simply a WMF file compressed using the gzip algorithm (RFC 1952), reducing the file size for more efficient storage and embedding within Office documents, web pages, and other containers. The underlying WMF format stores vector graphics as a sequence of GDI (Graphics Device Interface) function calls — commands that draw lines, curves, polygons, text, and bitmaps — recorded in a device-independent format that can be replayed at any resolution. WMZ preserves this vector nature: when decompressed, the file produces a standard WMF that renders through the Windows GDI subsystem using the same drawing primitives as on-screen display, ensuring visual fidelity across different output devices and resolutions. WMZ files are commonly found embedded in Microsoft Office documents (Word, Excel, PowerPoint), HTML email messages generated by Outlook, and web content produced by Office's Save as Web Page feature. The format is also used for clip art and template graphics distributed with Office installations. One advantage is space efficiency: gzip compression typically reduces WMF file sizes by 60-80%, meaningful when many small graphics are embedded in a single document or web page. The format's deep integration with the Microsoft Office ecosystem is another practical strength — WMZ graphics render natively in all Office applications without additional software, and can be extracted, decompressed, and converted using tools like LibreOffice, ImageMagick, Inkscape, and standard gzip utilities.
Developer: Microsoft
Initial release: 1999
ICO is the icon file format for Microsoft Windows, introduced with Windows 1.0 in 1985 and serving as the standard container for application icons, file type icons, and shortcut icons throughout the Windows ecosystem. An ICO file bundles multiple image variants within a single container — each at different sizes (16x16, 32x32, 48x48, 256x256, and others) and color depths (4-bit, 8-bit, 24-bit, 32-bit with alpha) — allowing Windows to select the most appropriate image for each display context, from tiny taskbar buttons to large desktop icons. The container structure consists of an ICONDIR header, an array of ICONDIRENTRY records describing each variant, and the image data itself. Since Windows Vista, ICO files support embedded PNG-compressed images for the larger sizes (typically 256x256), dramatically reducing file size while maintaining quality with full alpha transparency. One advantage is automatic size adaptation — Windows pulls the optimal resolution from the ICO container for each context (Explorer list view, desktop tile, Alt-Tab preview), ensuring crisp display without the application managing separate image files. The format's operating system-level integration is another core strength: ICO files serve as the identity mechanism for executables, file associations, and shortcuts across all Windows versions, and web browsers use favicon.ico for website identity in tabs and bookmarks. ICO creation and editing is supported by image editors like GIMP, Inkscape, and dedicated icon tools, and the format remains essential for Windows application development.
Developer: Microsoft
Initial release: 1985

Frequently Asked Questions

Why convert WMZ to ICO?

WMZ data from Microsoft Office documents and Windows clipboard becomes universally viewable once converted to ICO format.

How do I open ICO files?

Open ICO files with Windows, web browsers for favicons, icon editors. Most operating systems handle ICO natively or with built-in viewers.

Is WMZ to ICO conversion accurate?

The converter maintains image fidelity when transforming WMZ into ICO. Color data and dimensions are preserved accurately.

Does the conversion happen on my device?

No — conversion runs on Convertio servers. Your device handles only the upload and download, not the processing.

Can I convert multiple WMZ files at once?

Yes, batch processing is available. Add multiple WMZ files simultaneously and download each ICO result separately.

What quality can I expect from ICO output?

The ICO format offers multi-resolution icon format — Convertio ensures optimal encoding during the conversion process.