FB2 to ODT Converter
Convert FB2 to ODT online for free. Fast, secure, and high-quality conversion with no sign-up or software required.
Maximum file size is 1GB
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Three steps to your converted file
Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.
Upload your file
Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.
Choose an output format
Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.
Convert & download
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What is an FB2 file?
FB2 (FictionBook) is an XML-based e-book format originally developed in Russia by Dmitry Gribov. Unlike ZIP-based containers like EPUB, an FB2 file is a single monolithic XML document where the text is marked up with semantic tags describing the structure (epigraphs, verses, citations) rather than the visual appearance. Binary data, such as cover images or illustrations, are embedded directly within the XML file using Base64 encoding. This structural focus facilitates easy conversion to other formats and precise rendering across different hardware devices.
How to open an FB2 file
Support for FB2 is prevalent in e-reading software but rare in native OS environments. Calibre is the primary tool for opening and converting FB2 files on Windows, macOS, and Linux. For dedicated reading, FBReader and CoolReader are cross-platform applications specifically optimized for parsing the FictionBook XML schema. Android users frequently use Moon+ Reader, while iOS users can utilize TotalReader or KyBook.
FB2 Technical Info
- Full Name
- FictionBook 2.0
- Developed By
- Dmitry Gribov
- Initial Release
- 2000
- MIME Type
- application/x-fictionbook+xml
What is an ODT file?
ODT is the text document format of the OpenDocument standard (ISO/IEC 26300), maintained by the OASIS consortium. It employs an XML-based architecture where the document's content, styles, settings, and metadata are stored in separate XML files (e.g., content.xml, styles.xml) and compressed into a single ZIP container. It serves as the default native format for the LibreOffice and Apache OpenOffice suites.
How to open an ODT file
The file opens natively in LibreOffice Writer and Apache OpenOffice Writer on Linux, Windows, and macOS. Microsoft Word (2010 and later) and Google Docs also possess built-in import filters to read and edit ODT files, though minor formatting discrepancies may occur during conversion.
ODT Technical Info
- Full Name
- OpenDocument Text
- Developed By
- OASIS / Sun Microsystems
- Initial Release
- 2005
- MIME Type
- application/vnd.oasis.opendocument.text
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Purpose-built for speed, privacy, and breadth of format support.
Convert FB2 to ODT in seconds
Every FB2 to ODT conversion runs on our servers, so your device stays fast and the output quality stays intact.
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No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.
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Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.
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Developer API
Convert FB2 to ODT via API
Automate FB2 to ODT conversions in three steps: create a job, upload your file, then poll for the result.
# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"tag": "fb2-to-odt",
"tasks": {
"upload-file": {
"operation": "import/upload"
},
"convert": {
"operation": "convert",
"input": "upload-file",
"output_format": "odt"
},
"export-result": {
"operation": "export/url",
"input": "convert"
}
}
}'
# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.fb2
# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
-H "Authorization: Bearer YOUR_API_KEY"Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.