JP2 to TCR Converter

Free JP2 to TCR conversion — get electronic books instantly

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Works Everywhere

Run the converter from any device — desktop, tablet, or phone. All you need is a web browser and internet access to convert JP2 to TCR.

Batch Support

Convert multiple JP2 images to TCR in one session. Upload a batch, select the format once, and download all results — saves significant time.

Reader-Ready

The conversion produces a properly structured TCR file that displays correctly on e-readers, reading apps, and digital publishing platforms.

How to convert JP2 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

JP2 (JPEG 2000 Part 1) is an image format based on the JPEG 2000 compression standard, developed by the Joint Photographic Experts Group and published as ISO/IEC 15444-1 in December 2000 as the successor to the original JPEG standard. Unlike JPEG's block-based discrete cosine transform, JPEG 2000 uses discrete wavelet transform (DWT) compression, which eliminates the characteristic 8x8 block artifacts visible in highly compressed JPEG images and instead produces a smooth, gradual quality degradation. The format supports both lossy and lossless compression within the same codestream, along with features absent from original JPEG: 16-bit and higher bit-depth images, arbitrary numbers of color channels, alpha transparency, region-of-interest coding (allocating more bits to important areas), and progressive quality or resolution refinement from a single compressed stream. One advantage is superior image quality at low bit rates — JPEG 2000 produces visibly cleaner images than JPEG at equivalent file sizes, particularly below 0.5 bits per pixel where JPEG exhibits severe blocking. The progressive decoding capability is another strength: a single JP2 file can be decoded at any resolution or quality level without encoding multiple versions, valuable for remote sensing and medical imaging where the same image must serve both thumbnail browsing and full-resolution analysis. JP2 is the mandated format for digital cinema (DCI), the preferred format in geospatial data (GeoJP2), and widely adopted in cultural heritage digitization.
Initial release: December 2000
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 JP2 to TCR?

Converting to TCR creates an ebook-compatible container for your JP2 image — useful for digital publishing and e-reader distribution.

How do I open TCR?

Common tools for TCR include FBReader, Psion devices, Calibre. Most are available on multiple operating systems for easy access.

Are my images secure on Convertio?

Your privacy is protected — uploaded images are removed immediately after processing, and all converted outputs are deleted within 24 hours.

Can I convert JP2 to TCR for free?

Yes, Convertio offers free JP2 to TCR conversion for standard use. Premium subscriptions unlock higher capacity and priority processing speeds.

Can I convert JP2 to TCR on my phone?

Certainly. Open convertio.co in your mobile browser, upload your JP2 image, choose TCR, and download the result. No app installation required.