ICO to TCR Converter

Seamless ICO to TCR conversion online — always free

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Expand Usability

ICO is limited to icons and favicons — converting to TCR gives you a standard format that works in image editors, documents, and beyond.

Bulk Conversion

Need to convert dozens of ICO files? Upload them all and batch-convert to TCR — much faster than processing one at a time.

Instant Conversion

The ICO to TCR conversion engine processes files quickly — expect your download to be ready in just a few seconds after uploading.

How to convert ICO 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

ICO is the icon file format for Microsoft Windows, introduced with Windows 1.0 in 1985 and serving as the standard container for application icons, file type icons, and shortcut icons throughout the Windows ecosystem. An ICO file bundles multiple image variants within a single container — each at different sizes (16x16, 32x32, 48x48, 256x256, and others) and color depths (4-bit, 8-bit, 24-bit, 32-bit with alpha) — allowing Windows to select the most appropriate image for each display context, from tiny taskbar buttons to large desktop icons. The container structure consists of an ICONDIR header, an array of ICONDIRENTRY records describing each variant, and the image data itself. Since Windows Vista, ICO files support embedded PNG-compressed images for the larger sizes (typically 256x256), dramatically reducing file size while maintaining quality with full alpha transparency. One advantage is automatic size adaptation — Windows pulls the optimal resolution from the ICO container for each context (Explorer list view, desktop tile, Alt-Tab preview), ensuring crisp display without the application managing separate image files. The format's operating system-level integration is another core strength: ICO files serve as the identity mechanism for executables, file associations, and shortcuts across all Windows versions, and web browsers use favicon.ico for website identity in tabs and bookmarks. ICO creation and editing is supported by image editors like GIMP, Inkscape, and dedicated icon tools, and the format remains essential for Windows application development.
Developer: Microsoft
Initial release: 1985
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 ICO to TCR?

TCR compresses your content for Psion eBook devices — converting your icon to a lightweight text format for legacy handheld readers.

What programs open TCR files?

You can open TCR files with Calibre, Psion devices, CoolReader. Free alternatives are available for every platform.

Can I convert ICO to TCR for free?

Yes — Convertio offers free ICO to TCR conversion. For professional volumes and larger files, premium plans provide expanded limits and priority processing.

Does this work on mobile devices?

Yes — the ICO to TCR converter works in any mobile browser on iOS and Android. No app installation is needed — just open convertio.tools and upload your file.

Is batch ICO to TCR conversion available?

Absolutely — upload multiple ICO files simultaneously and convert them all to TCR at once. Batch mode saves considerable time on repetitive conversions.

Does ICO to TCR keep transparency?

If TCR supports transparency (like PNG or WEBP), the alpha channel from your ICO is preserved. Formats without transparency support fill with a solid background.

ICO to TCR Quality Rating

5.0 (1 votes)
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