Free Citation Tools for Researchers
Look up DOIs, convert citation styles, check BibTeX syntax, and format references. No account required.
Need to check a complete bibliography? Hallucite compares references with available publication evidence and shows entries that need review.
DOI Lookup
Enter a DOI to retrieve available publication metadata. Choose a citation style and copy the formatted reference.
- Look up publication metadata by DOI
- Format in six citation styles
- Copy the formatted citation
- View available title, author and publication details
Citation Style Converter
Paste a citation and convert it to APA, MLA, Chicago, Harvard, IEEE, or Vancouver. The parser detects the source style and extracts its reference details.
- Detect the source citation style
- Convert between six styles
- Handle author lists
- Copy the converted citation
BibTeX Validator
Check BibTeX entries for syntax errors, missing required fields, and formatting issues. Free, with no sign-up required.
- Check syntax and required fields
- Validate BibTeX entry types
- Upload a .bib file
- Read errors and warnings for each entry
Reference Formatter
Paste a reference, DOI, or BibTeX entry to format it in APA, MLA, Chicago, Harvard, IEEE, and Vancouver. Free, with no sign-up required.
- Produce six citation styles
- Use a DOI for metadata lookup when available
- Accept reference text, DOI, or BibTeX
- Copy each formatted reference
Tools for your reference workflow
Available publication metadata
DOI lookups return available publication metadata. Cached results and local mirror data may differ from the latest publisher record.
Six citation styles
Format references in APA, MLA, Chicago, Harvard, IEEE, and Vancouver. Review the result against your institution or journal requirements.
No sign-up required
These tools can be used without registration. Request limits apply.
Check publication evidence
These tools cover formatting, identifiers and file syntax. Publication identity needs a separate check.
Check a complete bibliography
Hallucite compares references with available publication records and shows evidence for matches, discrepancies and unresolved entries.
Verification sources
- Crossref
- PubMed
- NLM Catalog
- OpenAlex
- CiNii
- DBLP
- Open Library
- Google Books
- Semantic Scholar
- DOI registry