WBMP to SK Converter

Convert WBMP raster images to SK vector format online

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Any Device Works

Convert WBMP to SK from Windows, macOS, Linux, or mobile — the browser-based tool adapts to any screen size and operating system.

Secure Processing

Uploaded WBMP images are erased right after conversion, and the resulting SK files are purged within 24 hours — your data stays private.

Simple Interface

Three steps to convert: upload your WBMP, select SK, and download. The clean interface makes the process intuitive even for first-time users.

How to convert WBMP to SK

1

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

2

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

3

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

About formats

WBMP (Wireless Bitmap) is a monochrome (1-bit, black and white) image format defined as part of the Wireless Application Protocol (WAP) specification, developed by the WAP Forum (later consolidated into the Open Mobile Alliance) around 1998. The format was designed for the extremely constrained mobile devices of the late 1990s and early 2000s — phones with small monochrome screens, minimal processing power, and narrow bandwidth GSM data connections. WBMP uses the simplest possible encoding: a type identifier byte (always 0 for the only defined type), width and height encoded as multi-byte integers using a variable-length scheme, and the raw pixel data where each bit represents one pixel (0 for white, 1 for black) packed eight per byte. There is no compression, no metadata, and no color — the format is purely a minimal container for delivering small monochrome graphics to WAP-era mobile browsers. One advantage was extreme efficiency on constrained devices — WBMP images could be decoded with virtually zero CPU overhead and minimal memory, critical on early mobile hardware running at single-digit megahertz clock speeds. The tiny file sizes are another strength: a typical WBMP icon occupied just a few hundred bytes, practical for transfer over 9.6 kbps GSM data channels. While the WAP ecosystem has been entirely superseded by modern mobile web browsers capable of rendering full-color JPEG, PNG, and WebP images, WBMP files remain encountered in archived mobile content from that transitional era.
Developer: WAP Forum
Initial release: 1998
SK is the native file format of Skencil (originally named Sketch), a free vector graphics editor for Linux created by Bernhard Herzog, with the first public release on October 31, 1998. Skencil holds historical significance as one of the earliest full-featured vector drawing applications written almost entirely in Python, with only performance-critical rendering components implemented in C. The SK file format uses a text-based, Python-like syntax to describe document structure — pages, layers, groups, and individual graphic objects are represented as nested statements with parameters specifying coordinates, colors, line styles, and transformations. The format supports Bezier curves, rectangles, ellipses, text objects with font specifications, imported raster images, gradient and pattern fills, and hierarchical grouping with affine transforms. One advantage is human readability — SK files can be opened in any text editor, making it possible to inspect, modify, or generate artwork programmatically using simple scripts. The Python-native structure also provides a benefit for automation: since Skencil itself is a Python application, the file format integrates naturally with scripting workflows for batch processing and procedural graphic generation. While Skencil's development slowed after the mid-2000s, its SK format became the foundation for the sK1 project, which extended the format and continued active open-source vector graphics development. SK files remain convertible through sK1, UniConvertor, and other open-source tools.
Developer: Bernhard Herzog
Initial release: October 31, 1998

Frequently Asked Questions

Why would I convert WBMP to SK?

Transforming WBMP to SK means moving from a limited bitmap to Sketch/Skencil vector drawing format — scalable output suitable for print, web, and design workflows.

How do I open a SK file?

Software that handles SK includes Skencil, Inkscape (with import), UniConvertor — giving you options on every major operating system.

Is WBMP to SK conversion free?

Yes — Convertio offers free WBMP to SK conversion. Premium options exist for users who need more capacity or faster processing speeds.

What exactly is the WBMP format?

WBMP (monochrome bitmap from the WAP era for early mobile phones) originated in WAP mobile phones. It has very limited modern application support but can be converted to modern formats on Convertio.

Is my WBMP file safe when converting online?

Your files are secure. Uploaded WBMP images are erased immediately after processing, and SK outputs are purged within 24 hours.

Does converting WBMP to SK affect quality?

Quality is maintained to the extent SK supports. Since WBMP is a monochrome bitmap from the WAP era for early mobile phones, the visual data transfers cleanly to SK.