BibTeX File Format (.bib): What It Is and How to Open It

BibTeX at a glance#

Full name	BibTeX bibliography
File extension	.bib
Category	Documents
Developer	Oren Patashnik and Leslie Lamport
First released	1985
Compression	Uncompressed
Specification	BibTeXing (Patashnik)
FileFlip support	FileFlip reads and writes this format

What a .bib file can hold#

These are the things a BibTeX file either supports or does not, and they are what decides whether a conversion keeps everything or quietly drops something.

Selectable text	Yes
Human readable	Yes

Strengths and limitations of BibTeX#

What BibTeX does well

Every major reference manager, Zotero, Mendeley and EndNote among them, can export to BibTeX, so it works as a common exchange format between them
Entries are plain text, so a citation database is easy to diff and version alongside a paper's LaTeX source
A .bst style file renders the same .bib data in whatever citation style a journal requires, without touching the data itself

Where BibTeX falls short

BibTeX doesn't enforce which fields an entry type requires, so a malformed entry often only surfaces as an error when the document compiles
Limited support for non-Latin scripts and Unicode beyond LaTeX's input encoding, which is why biblatex plus biber has largely replaced it for that use case
Outside the LaTeX ecosystem most software treats it only as an import or export option, not a native format

Keep a bibliography as BibTeX when it's cited from a LaTeX document, since bibtex and biblatex read the format natively.

Convert BibTeX to RIS when moving citations into a reference manager or database that doesn't read BibTeX directly.

How to open a .bib file#

A .bib file opens in the programs below, grouped by the platform you are on. If you would rather not install anything, FileFlip converts BibTeX into a format your machine already opens, and it does it in the browser tab rather than on a server.

Platform	Programs that open it
Windows	JabRef, Zotero, Mendeley, Any text editor
macOS	JabRef, Zotero, Mendeley, Any text editor
Linux	JabRef, Zotero, Any text editor
Web	FileFlip

BibTeX questions people ask#

What program opens a .bib file?

A .bib file is plain text, so it opens in any editor, but reference managers like JabRef, Zotero and Mendeley open it as a structured bibliography with fields for author, title and year rather than raw text.

What's the difference between BibTeX and RIS?

BibTeX is the citation format LaTeX documents cite against, with entries typed as @article or @book. RIS is a tagged format built for reference manager interoperability rather than any one typesetting system. Most reference managers convert between the two on import and export.

Can I edit a .bib file in a plain text editor?

Yes. A BibTeX file is human-readable text, and each entry's fields, author, title, year, journal, are plain key-value pairs, so editing one directly is common and doesn't require special software.

What's the difference between BibTeX and BibLaTeX?

BibTeX is the original 1985 citation processor and its .bib file format. BibLaTeX is a newer LaTeX package that reads the same .bib files but does the citation formatting inside LaTeX itself, usually paired with the biber backend instead of bibtex, which handles Unicode and more fields correctly.

Converting BibTeX files#

Every conversion runs inside your browser. The file is read from your disk, the work happens on your own machine, and nothing is uploaded. How FileFlip works names the engine behind each family and how to verify that for yourself.

BibTeX File Format (.bib)