WBMP to TCR Converter

Turn WBMP images into TCR e-reader format online

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Lightning Fast

WBMP files are small and convert to TCR in seconds. The cloud-based engine handles the transformation quickly so you can download right away.

E-Reader Ready

Convert WBMP images into TCR format, ready for e-readers and reading apps. TCR eBook is supported by major e-book platforms.

Secure Processing

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

How to convert WBMP to TCR

1

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

2

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

3

Let the file convert and you can download your tcr 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
TCR (Text Compression for Reader) is a compressed plain-text ebook format developed by Barry Childress in the early 1990s for the Psion Series 3 family of palmtop computers. The format was created for Childress's Reader3 application, a text file viewer that needed to fit large books into the Psion's extremely limited storage — typically 128 KB to 2 MB of available memory. TCR uses a dictionary-based compression scheme derived from the earlier ZVR format by Ian Giddings, replacing repeated byte sequences with single-byte tokens that reference a header dictionary. This straightforward approach achieves compression ratios of roughly 40-60% on typical English prose while requiring minimal CPU resources for decompression. The Psion Series 3 ran on a 3.84 MHz NEC V30 processor with no floating-point unit, so TCR's low computational overhead was essential for smooth page-by-page reading. A key advantage is remarkable storage efficiency for its simplicity — users could carry dozens of novels on removable SSD cards that held only a few hundred kilobytes. The format found a dedicated user community among Psion enthusiasts who built libraries of compressed literature for portable reading years before smartphones existed. Though the Psion platform faded from the market in the early 2000s, TCR files can still be opened and converted by modern ebook tools, and the format stands as an early example of purpose-built mobile reading technology from the pre-smartphone era.
Developer: Barry Childress
Initial release: 1993

Frequently Asked Questions

Why would I convert WBMP to TCR?

TCR (compressed text format for Psion devices) lets you include WBMP graphics in e-book collections, accessible on dedicated readers and mobile apps.

How do I open a TCR file?

Software that handles TCR includes Calibre, Psion e-book readers — giving you options on every major operating system.

Does converting WBMP to TCR affect quality?

Your image content stays intact during conversion. Any differences depend on TCR characteristics — such as color depth or compression method.

Are my uploaded files kept private?

Completely. Convertio removes uploaded WBMP files right after conversion, and the TCR output is automatically deleted within 24 hours.

What exactly is the WBMP format?

The WBMP format is a monochrome bitmap from the WAP era for early mobile phones, rooted in WAP mobile phones. Modern software rarely supports it natively, making conversion essential.

Does this converter work on mobile devices?

The converter is browser-based and fully responsive. Convert WBMP to TCR from any device — desktop, laptop, tablet, or smartphone.