--- title: Browser Extension - Cite from any page | Scholar Sidekick description: Right-click any DOI, PMID, ISBN, arXiv ID, or paper URL to cite. APA, Vancouver, IEEE, plus 10,000+ CSL styles. Free Chrome / Firefox / Edge extension. doc_version: "1.0" last_updated: "2026-04-30" --- # Cite from any page > Turn any DOI, PMID, ISBN, arXiv ID, or scholarly URL into a clean, formatted citation in one click - without leaving the page you're reading. > Free Chrome / Firefox / Edge extension. Vancouver, APA, IEEE, plus 10,000+ CSL styles. > HTML version: https://scholar-sidekick.com/extension > Last updated: 2026-04-30 Highlight a DOI, PubMed ID, PMC ID, ISBN, arXiv ID, ADS bibcode, or scholarly URL on any web page. Right-click and choose **Cite with Scholar Sidekick**. A small popup opens with your formatted citation, ready to copy. ## How it works 1. **Select text** on any page that contains a scholarly identifier - for example, a DOI like `10.1038/nature12373`, a PMID, or a Wikipedia article snippet that mentions a paper. 2. **Right-click** the selection and choose *Cite with Scholar Sidekick*. 3. The popup shows your selection and **auto-formats** it in the citation style you've chosen. 4. Click **Copy**. Paste into your essay, manuscript, or reference list. ## What you can cite - **DOI** - both bare (`10.1038/nature12373`) and URL form. - **PubMed ID** (PMID). - **PMC ID** (PMCID). - **ISBN-10** and **ISBN-13**, with or without dashes. - **arXiv ID** - modern (`2207.00077`) and legacy (`cs.CL/0301001`), with or without version suffixes. - **NASA ADS bibcode**. - **Scholarly URLs** from a curated allowlist of major bibliographic data sources. Identifier type is auto-detected from your selection - no need to label it. ## Citation styles - Five **quick picks** always one click away: Vancouver, APA, AMA, IEEE, CSE. - Search any of **10,000+ CSL styles** - Nature, Cell, The Lancet, Chicago Manual of Style, Harvard, MLA, ACS, Royal Society, journal-specific styles, and more. - Your most-recently-used style is **remembered locally** for next time. - Output is generated by the same engine that powers [scholar-sidekick.com](https://scholar-sidekick.com) - formatting is identical between extension and website. ## Privacy - **No content scripts.** The extension does not read page contents, browsing history, or anything else from the pages you visit. - **It only ever sees text you explicitly select** and submit via the right-click menu. - Selected text is sent to scholar-sidekick.com to produce the citation, then discarded - not stored, not used to train models, not shared. - **No analytics. No advertising trackers. No accounts.** - Full disclosure: [privacy policy](https://scholar-sidekick.com/legal/privacy). ## Install Live on the Chrome Web Store, Firefox Add-ons, and Edge Add-ons. - **Chrome** - [Install for Chrome](https://chromewebstore.google.com/detail/scholar-sidekick-%E2%80%94-cite-f/dcchjfkidihajjochnilegeghkaecchl) - **Firefox** - [Install for Firefox](https://addons.mozilla.org/en-US/firefox/addon/scholar-sidekick-cite-anywhere/) - **Edge** - [Install for Edge](https://microsoftedge.microsoft.com/addons/detail/scholar-sidekick-%E2%80%94-cite-f/jeijbjodaopenpbeoppllmdojgmggkoh) **Already use Scholar Sidekick on the web?** No install needed - [format citations directly at scholar-sidekick.com](https://scholar-sidekick.com). The extension is just a faster path for in-the-moment citing while you read. ## FAQ ### What does the extension do? It adds a "Cite with Scholar Sidekick" item to the right-click menu when text is selected. Highlight a DOI, PMID, ISBN, arXiv ID, ADS bibcode, or scholarly URL on any web page, click the menu item, and a popup shows the formatted citation in your chosen style - ready to copy. ### Is it free? Yes. No account required, no API key, no payment. The extension uses the public anonymous tier of the Scholar Sidekick API, which allows 12 citation requests per 30 seconds per IP - plenty for interactive use. ### What identifiers does it support? DOI, PubMed ID (PMID), PMC ID (PMCID), ISBN-10 / ISBN-13, arXiv ID (modern and legacy), NASA ADS bibcode, and scholarly URLs from a curated allowlist of major bibliographic data sources. Auto-detected - you don't need to label it. ### Which citation styles can I use? Five quick picks always available: Vancouver, APA, AMA, IEEE, CSE. Plus a search box that covers any of 10,000+ CSL styles - Nature, Cell, The Lancet, Chicago Manual of Style, Harvard, MLA, ACS, Royal Society, journal-specific styles, and more. ### Does it replace my reference manager (Zotero, Mendeley, EndNote)? No. The extension is a citation formatter, not a reference manager - it doesn't store libraries, manage PDFs, or sync across devices. Use it alongside your reference manager: paste in identifiers, get citations, copy out. For a full reference workflow, scholar-sidekick.com offers batch export to BibTeX, RIS, EndNote XML, CSV, and Markdown. ### What about privacy? The extension contains no content scripts. It does not read page contents, browsing history, or anything else from the pages you visit. It only ever sees the text you explicitly select and submit via the right-click menu. Selected text is sent to scholar-sidekick.com to produce the citation, then discarded - not stored, not used to train models, not shared. No analytics, no advertising trackers. ### Does it work offline? No. The extension calls the Scholar Sidekick API at scholar-sidekick.com to resolve identifiers and produce formatted citations, so an internet connection is required. ## Related - [Integrations](https://scholar-sidekick.com/integrations) - same citation engine, surfaced as native commands inside the notes apps you write in (Obsidian and more). - [Free tools](https://scholar-sidekick.com/tools) - DOI lookup, identifier detector, retraction checker, OA checker, and more. - [API docs](https://scholar-sidekick.com/docs) - REST + OpenAPI spec for programmatic access. - [MCP server](https://scholar-sidekick.com/mcp) - citation tools for Claude, Cursor, Windsurf, and other agents. ## Sitemap See the full [sitemap](https://scholar-sidekick.com/sitemap.md) for all pages.