BibTeX Validator

BibTeX Validator answers a useful question early: is this bibliography structurally ready to use? It checks the entries as you type, so a broken brace or duplicate key does not have to surface at the end of a compile.

Use it when

• you received a .bib file from another tool;
• citations compile inconsistently after entries were merged;
• you want a quick check without opening a project;
• you are about to share or archive a bibliography.

Use the reference-library cleaner inside a project when you want a previewed cleanup across actual files. The validator reports problems but does not rewrite the library.

Validate a bibliography

1. Open BibTeX Validator, or run /bibtex-validator.
2. Paste one or more complete BibTeX entries.
3. Read the validation result as it updates.
4. Fix parse errors, missing required fields, and repeated citation keys in the source copy.
5. Run the check again, then compile the project that uses the file.

Example:

@article{lee2026,
  author = {Lee, Mina},
  title = {A Reproducible Result},
  year = {2026}
}

An article may be flagged when a field required by its entry type, such as the journal, is absent. Reusing lee2026 for another entry is reported as a duplicate key.

What a clean result means

A clean result means the text parses and passes the validator’s structural rules. It does not prove that the source exists or that the title, author order, date, DOI, and page range are correct.

The check runs entirely on your device. For formatted output in eight styles, use Bibliography Generator.