TCR to PDB Converter

Convert TCR to PDB Palm database format online free

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Same Era, Better Format

Move from TCR to PDB — both are Palm-era formats, but PDB enjoys wider reader support and a more flexible container structure.

Browser-Only Workflow

No desktop software to install or configure. Open Convertio in any browser, upload TCR, and download PDB in a streamlined process.

Seconds to Convert

TCR and PDB are both lightweight formats — expect near-instant conversion times with zero load on your own hardware.

How to convert TCR to PDB

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

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

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

About formats

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

PDB (Palm Database) is a generic database container format created by Palm, Inc. for the Palm OS platform, first appearing with the original PalmPilot in March 1996. In the ebook context, PDB files most commonly use the PalmDOC or Plucker encoding to store readable text with basic formatting. The format consists of a 78-byte header identifying the database name, creation date, and record count, followed by a record index table and the data records themselves. PalmDOC-encoded PDB files use a simple LZ77-based compression scheme to pack plain text efficiently, while Plucker extends this with HTML rendering, image support, and hyperlink navigation. PDB ebooks powered a thriving mobile reading ecosystem years before dedicated e-readers existed — millions of Palm OS users carried entire libraries on devices like the Palm V, Tungsten, and Treo handhelds. A primary advantage is extreme simplicity: the flat record structure and minimal overhead mean PDB files parse instantly even on severely constrained hardware with limited memory and processing power. The open, well-documented structure is another strength, having spawned numerous reader applications across Palm OS, Windows, and later mobile platforms. Though the Palm platform is long discontinued, PDB ebooks remain accessible through conversion tools and readers like Calibre, and the format holds historical significance as one of the earliest practical mobile ebook solutions.

Developer: Palm, Inc.

Initial release: March 1996

Frequently Asked Questions

Why convert TCR to PDB?

PDB is a broader Palm database container supported by more readers like iSilo and Plucker. TCR only works with a handful of old PalmOS apps.

What programs can open PDB files?

Calibre reads PDB on desktop. On mobile, PDB ebooks work in readers like iSilo. Some Palm emulators also handle the format natively.

Are TCR and PDB related formats?

Both come from the PalmOS era, but PDB is a general-purpose container while TCR is a narrow compressed-text format with fewer features.

Does converting from TCR to PDB preserve text?

Yes, all plain text content from the TCR file is carried over to PDB without any loss or modification to the original characters.

Is this conversion available for free?

Convertio provides TCR to PDB conversion at no charge. Premium plans offer batch conversion and additional features for power users.

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