usefulweb.site CiteShape

Developer & data tools

CiteShape

Paste a DOI, ORCID iD, ISBN or arXiv ID: validated, resolved, and formatted as APA, BibTeX and RIS.

Try an example: ORCID check digit (offline) · ISBN-10 → ISBN-13 (offline) · Invalid ORCID (offline)

How it works

CiteShape finds the identifier in whatever you paste (URL, "doi:", reference text), normalises it, validates check digits (ORCID ISO 7064, ISBN-10/13), resolves authoritative metadata from Crossref, ORCID and arXiv, and emits APA-style, BibTeX and RIS citations. Retrieved facts are kept separate from your input, and nothing missing is guessed.

  • Detection order: DOI (10.prefix/suffix, also in doi.org URLs) → ORCID iD → arXiv ID → ISBN. DOIs are lower-cased (DOIs are case-insensitive).
  • ORCID: ISO 7064 MOD 11-2 check digit. ISBN-10: weighted sum mod 11; ISBN-13: alternating 1/3 weights mod 10. ISBN-10 is converted to ISBN-13 with prefix 978.
  • Resolution: DOI → api.crossref.org/works/{doi}; ORCID → pub.orcid.org/v3.0/{id}/record (JSON); arXiv → export.arxiv.org/api/query. ISBN metadata is not resolved (no open authoritative registry).
  • Citations are generated only from retrieved metadata; APA output follows APA 7 reference structure for author list, year, title, container, volume(issue), pages and DOI link.

For scripts and AI agents

  • JSON API: POST https://citeshape.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://citeshape.usefulweb.site/mcp · tool name citeshape
Example request
curl -s -X POST https://citeshape.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"identifier":"https://orcid.org/0000-0002-1825-0097","resolve":false}'

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