---
title: PMID to PMCID Converter - PubMed ID Lookup | Scholar Sidekick
description: Convert between PMID, PMCID, and DOI instantly. Enter any PubMed identifier and get the other two. Free tool. No signup required.
doc_version: "1.0"
last_updated: "2026-05-18"
---

# PMID / PMCID / DOI Converter

> HTML version: https://scholar-sidekick.com/tools/pubmed-id-converter

Enter any one of PMID (PubMed ID), PMCID (PubMed Central ID), or DOI and get the other two for the same paper. Resolves through NCBI's PubMed and PMC services plus Crossref.

## What this tool does

Looks up the paper at the identifier you provide and returns whichever of the three IDs the registry exposes. Most journal-published biomedical papers carry both a DOI and a PMID; an article that is full-text in PubMed Central also carries a PMCID. The converter chains the registries so a single input resolves to all three when they exist.

## How to use

1. Open [the tool](https://scholar-sidekick.com/tools/pubmed-id-converter).
2. Paste any of: a DOI, a PMID (numeric), or a PMCID (PMC-prefixed).
3. Copy the resolved IDs.

## Programmatic access

The conversion is implicit in the [`POST /api/format`](https://scholar-sidekick.com/docs) endpoint: the resolved metadata response includes all identifiers the registry exposes. The [scholar-sidekick MCP](https://scholar-sidekick.com/mcp) `resolveIdentifier` tool exposes the same data structurally.

## Related tools

- [DOI Lookup](https://scholar-sidekick.com/tools/doi-lookup) - full metadata for a single identifier
- [Identifier Validator](https://scholar-sidekick.com/tools/identifier-validator) - well-formedness and resolvability check
- [Identifier Detector](https://scholar-sidekick.com/tools/identifier-detector) - bulk extraction from a text block
- [Free tools index](https://scholar-sidekick.com/tools) - all citation tools

## Sitemap

See the full [sitemap](https://scholar-sidekick.com/sitemap.md) for all pages.