twineconvert

free · in-browser · no upload

ODS to CSL-JSON
Converter

Drop your ODS file. We'll convert it to CSL-JSON right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .ods, .ots

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a ODS from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your CSL-JSON the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert ODS → CSL-JSON

What this conversion is actually for

Researchers often keep references in a spreadsheet (one row per source, columns like title, author, year, journal, DOI). This reads your OpenDocument / LibreOffice Calc sheet and writes CSL-JSON so you can import the whole library into Zotero or a pandoc workflow at once. Column headers are matched case- and alias-insensitively, so PubMed, Zotero, and Excel exports work without renaming anything. Runs in your browser, nothing is uploaded.

A real example

You have a OpenDocument / LibreOffice Calc sheet of papers (title, authors, year, DOI columns) and need to load them into Zotero or a pandoc workflow. Drop the sheet here and get a CSL-JSON file with every row as a reference.

Troubleshooting

No references found, or fields are missing.

The first row must be headers naming the fields (title, author/authors, year, journal, doi, ...). If a column is missing from the output, rename its header to one of those names. Only the first sheet is read.

Formats involved

About ODS and CSL-JSON

ODS, OpenDocument Spreadsheet

ODS is the OpenDocument format spreadsheet, used by LibreOffice Calc, Apache OpenOffice Calc, and Collabora Online. ZIP-packaged XML structure standardized by ISO/IEC 26300. The free/open-source counterpart to Microsoft's XLSX. Excel reads ODS but with feature loss on complex formulas; LibreOffice reads XLSX with similar caveats.

How to open

LibreOffice Calc (free, every desktop OS) is the native editor. Microsoft Excel opens ODS but pins it as 'OpenDocument' with a downgraded ribbon. Google Sheets imports ODS via File → Import.

Full ODS format guide →
CSL-JSON, Citation Style Language JSON

CSL-JSON is the modern interop format for citation metadata. Zotero exports it natively (right-click a collection → Export → CSL JSON). Pandoc consumes it as `--bibliography file.json` for reference rendering. Every major reference manager (Zotero, Mendeley, Citavi, Papers, Bookends) reads or writes it. Defined by the Citation Style Language project; covers ~100 fields across journals, books, chapters, theses, software, datasets, and more. The de-facto replacement for BibTeX in modern academic toolchains.

How to open

Any JSON viewer or text editor. Zotero imports via File → Import → CSL JSON. Pandoc references it as bibliography input. JabRef, Citavi, and Bookends all accept CSL-JSON drop-ins.

Full CSL-JSON format guide →

You may also need

More tools people use alongside this one

Related tools

Convert other files to CSL-JSON

Convert your ODS to other formats

FAQ

Common questions

Is this ODS → CSL-JSON converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert ODS to CSL-JSON?

Spreadsheet exchange in the LibreOffice/OpenOffice ecosystem. Cross-tool bibliography exchange between reference managers. The most common reason to convert is compatibility, CSL-JSON works in places where ODS doesn't, or vice versa.

How do I open a ODS file in the first place?

LibreOffice Calc (free, every desktop OS) is the native editor. Microsoft Excel opens ODS but pins it as 'OpenDocument' with a downgraded ribbon. Google Sheets imports ODS via File → Import.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.