Small, focused web tools for working with scholarly identifiers and citations. Each tool is free to use and requires no signup.
Paste a citation. The verifier resolves the identifier, compares the resolved title to the cited title, and flags fabricated citations (real DOI + invented title - the Topaz et al. Lancet 2026 pattern).
Paste any text and instantly find every DOI, PubMed ID, PMCID, arXiv ID, ISBN, ISSN, ADS bibcode, and scholarly URL it contains.
Enter a DOI, PMID, or any identifier and instantly see the full metadata: title, authors, journal, year, and identifiers.
Enter a PMID, PMCID, or DOI and instantly get the other two identifiers. Essential for NIH grant applications and cross-database lookups.
Enter a DOI, PubMed ID, arXiv ID, or any scholarly identifier and instantly get a formatted BibTeX entry ready to paste into a .bib file.
Enter any scholarly identifier and download an RIS file you can import into Zotero, Mendeley, EndNote, or any reference manager.
Check if a paper is open access. Enter any identifier and see where to read it for free. Powered by Unpaywall.
Check if a paper has been retracted, corrected, or flagged with an expression of concern. Powered by Retraction Watch via CrossRef.
Compare how the same paper looks in Vancouver, APA, AMA, IEEE, and CSE. Enter any identifier and see formatted citations side by side.
Check if a DOI, PMID, ISBN, or other scholarly identifier is valid and resolvable. See the detected type, canonical form, and whether it returns real metadata.
Looking for the main citation formatting tool? Use the Scholar Sidekick resolver to format DOIs, PMIDs, and more into Vancouver, APA, AMA, IEEE, CSE, or any of 10,000+ CSL styles, and export them to RIS, BibTeX, and more. See the API documentation if you want to build on top of Scholar Sidekick, or the MCP server for AI-assistant integrations.