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HomeMOBI vs TCR
.mobi
.tcr

MOBI vs TCR

Compare Mobipocket eBook and Psion eBook formats — understand the key differences and when to use each

Format Overview

MOBI

Mobipocket eBook

MOBI is Amazon's legacy eBook format, originally created by Mobipocket and acquired by Amazon for Kindle devices. MOBI supports basic text formatting, images, tables, and bookmarks. While Amazon has transitioned to newer formats (KF8/AZW3), MOBI remains compatible with all Kindle devices and apps. MOBI files are limited compared to EPUB: they don't support video, advanced CSS, or the latest accessibility features. For publishing on Amazon, authors typically upload EPUB or DOCX files, which Amazon converts to its internal format. Converting MOBI to EPUB provides access to a wider range of e-readers and more modern features.

.mobiebook

TCR

Psion eBook

Psion eBook (.tcr) is a ebook file format.

.tcrebook

MOBI vs TCR: Feature Comparison

FeatureMOBITCR
Full NameMobipocket eBookPsion eBook
File Extension.mobi.tcr
Categoryebookebook
Free to Convert✓ Yes✓ Yes
Browser Support✓ All Browsers✓ All Browsers
Convert to Each Other✓ Yes✓ Yes

When to Use MOBI vs TCR

Use MOBI when you need:

  • •Files in Mobipocket eBook format for maximum compatibility
  • •Industry-standard ebook format support
  • •Wide software and platform compatibility

Use TCR when you need:

  • •Files in Psion eBook format for specific workflows
  • •Optimized ebook format features
  • •Modern format advantages and smaller file sizes

Convert Between Them

MOBI TCRTCR MOBI
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Learn More About These Formats

MOBI Converter TCR Converter

Frequently Asked Questions

What is the difference between MOBI and TCR?
MOBI (Mobipocket eBook) and TCR (Psion eBook) are both ebook file formats. MOBI files use the .mobi extension while TCR uses .tcr. They differ in compression, quality, compatibility, and intended use cases.
Can I convert MOBI to TCR for free?
Yes! Convert999 lets you convert MOBI to TCR completely free, directly in your browser. No file upload to any server, no registration needed — your files stay private on your device.
Which is better, MOBI or TCR?
It depends on your use case. MOBI (Mobipocket eBook) may be better for certain workflows, while TCR (Psion eBook) excels in others. Consider factors like file size, quality, software compatibility, and your specific needs.
Is it safe to convert files on Convert999?
Absolutely. Convert999 processes all files 100% locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

MOBI Converter

Convert from MOBI

TCR Converter

Convert from TCR

File Tools

Compress, resize, merge

Convert to MOBI

All sources → MOBI

Convert to TCR

All sources → TCR

Format Statistics

Trends & data 2025

More Format Comparisons

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