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Online BibTeX Validator & Syntax Linter
Instantly detect and repair unclosed braces, fatal unescaped characters (&, %, _, #), invalid citation keys, and missing required fields that break Overleaf and LaTeX compilations.
Zero Server Uploads: Your references never leave your machine. All linting and formatting runs 100% locally in your browser.
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Paste your bibliography snippet above, click 'Load Faulty Sample', or select a .bib file from your computer.
Comprehensive Guide
Getting 'Citation undefined' or [?] question marks in Overleaf?
Read our 6-step diagnostic guide on solving Biber vs. BibTeX engine mismatches, multi-pass compile cycles, and cache clearing.
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Professional Manuscript & Thesis Formatting Support
Full compliance with institutional graduate guidelines, IEEE, APA 7, and target journal LaTeX & Word submission requirements.