Citation Check

Free Citation Tools for Researchers

Speed up your academic workflow with our free citation utilities. Look up DOIs, convert citation styles, and format references -- no account required.

Need to verify entire bibliographies against CrossRef, Semantic Scholar, PubMed, and OpenAlex? Sign up for Citation Check and automate your citation verification process.

DOI Lookup

Enter any DOI and instantly retrieve full citation metadata from CrossRef. Get a formatted citation in APA, MLA, Chicago, Harvard, IEEE, or Vancouver style with a single click.

  • Lookup any DOI from CrossRef
  • Format in 6 citation styles
  • Copy citation to clipboard
  • View full metadata (title, authors, journal, year)

Citation Style Converter

Paste a citation in any format and convert it to APA, MLA, Chicago, Harvard, IEEE, or Vancouver style. Our parser auto-detects the source format and reformats it for you.

  • Auto-detect source citation style
  • Convert between 6 major styles
  • Handles complex author lists
  • Copy converted citation instantly

BibTeX Validator

Validate your BibTeX entries for syntax errors, missing required fields, and formatting issues. Supports all standard entry types including @article, @book, @inproceedings, and more.

  • Check syntax and required fields
  • Validate all BibTeX entry types
  • Upload .bib files directly
  • Get specific error messages and suggestions

Reference Formatter

Paste a reference in any format or enter a DOI, and get it formatted in APA, MLA, Chicago, Harvard, IEEE, and Vancouver styles. Perfect for quickly reformatting your bibliography.

  • Format in 6 citation styles at once
  • Enter a DOI for automatic metadata lookup
  • Supports plain text, DOI, and BibTeX input
  • Copy each formatted citation with one click

Why Use Our Free Citation Tools?

Accurate & Up-to-Date

Our DOI lookup queries CrossRef in real time, so you always get the latest metadata including title, authors, journal, volume, issue, and pages.

Six Major Styles

Format or convert citations in APA (7th edition), MLA (9th edition), Chicago, Harvard, IEEE, and Vancouver -- the most widely used styles in academia.

No Sign-Up Required

Both tools are completely free and require no registration. Use them as many times as you need to format your reference lists.

Need to Verify Your Entire Bibliography?

Citation Check verifies every reference against CrossRef, PubMed, Semantic Scholar, and OpenAlex -- catching errors, missing DOIs, and suspicious citations automatically.