XLSX to TCR Converter

Convert XLSX to TCR eBook format — free online

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Compact eBook Format

TCR compresses text efficiently — your XLSX data becomes a small eBook file ideal for Psion devices and compatible readers.

Rapid Processing

Cloud servers transform XLSX to TCR in seconds. No local installation or processing overhead required from your device.

Secure Handling

Uploaded XLSX files are erased immediately. Generated TCR files are removed within 24 hours for complete privacy.

How to convert XLSX 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

XLSX is the default spreadsheet format for Microsoft Excel since Office 2007, based on the Office Open XML (OOXML) standard published as ECMA-376 and adopted as ISO/IEC 29500. An XLSX file is a ZIP archive containing XML documents that describe workbook structure, sheet data, styles, shared strings, formulas, charts, pivot tables, and relationships between components. Each worksheet is stored as a separate XML part where cells are organized by row and column references with typed values and style indices. The XML foundation enables programmatic spreadsheet creation and manipulation using libraries like openpyxl (Python), Apache POI (Java), and ClosedXML (.NET) without requiring Excel. XLSX dramatically expanded capacity compared to XLS: over 1 million rows and 16,384 columns per sheet, enabling use cases previously impossible in the binary format. One advantage is openness and cross-platform support — the documented OOXML specification enables implementation by LibreOffice Calc, Google Sheets, Apple Numbers, and numerous specialized tools. Built-in ZIP compression is another practical strength: XLSX files are typically 50-75% smaller than equivalent XLS files, and the modular XML structure improves data recovery when files are partially corrupted. The format supports modern Excel features including structured tables, slicers, sparklines, Power Query connections, and real-time co-authoring. XLSX has become the standard format for spreadsheet data interchange across business, scientific, and government domains.
Developer: Microsoft
Initial release: January 30, 2007
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 convert XLSX to TCR?

TCR is a compressed text format for Psion devices — converting turns your spreadsheet data into a compact, readable eBook.

What devices support TCR?

Psion handheld devices and some Android eReader apps (like CoolReader) can open TCR files. Calibre also handles them.

Is TCR a compressed format?

Yes — TCR uses compression to minimize file size. This made it ideal for memory-constrained Psion hardware.

Is this conversion free?

Basic conversions are free. Premium plans offer higher throughput and file-size limits for demanding conversion workflows.

Can I convert without signing up?

No account is needed. Open Convertio in your browser, upload the XLSX, and download the TCR — that is the complete process.

Is my data handled securely?

Uploaded files are deleted after conversion completes. Output TCR files are automatically purged within 24 hours.

XLSX to TCR Quality Rating

4.5 (6 votes)
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