Installing and Editing EndNote Output Styles

An EndNote output style is the file that controls how your in-text citations and bibliography are formatted — author order, punctuation, italics, whether citations appear as names or numbers. EndNote ships with a large built-in library of styles, but a specific journal’s house style is sometimes not among them, or the closest match is not quite right. This guide covers three things in order: finding a style you do not already have, installing the file EndNote uses for it, and editing a style yourself in the Style Editor when no exact match exists. For the separate question of switching an already-installed style from author-date to numbered format (Vancouver, IEEE), see switching EndNote citations to a numbered style in Word; for installing the Cite While You Write add-in itself, see installing EndNote Cite While You Write in Word.

What an output style file actually is

Every EndNote output style is a single file with the .ens extension. It is not part of your library (the .enl file and its .Data folder) — it is a separate, reusable formatting template that any library can apply. That separation is why changing styles does not touch your stored references: the underlying data stays the same, and only the way it is displayed and printed changes. A style file defines several independent template sets — how an in-text citation is built, how a bibliography entry is built, how footnotes and figure/table captions are built — each with its own field-code template and punctuation rules. Two journals that look similar in a printed bibliography can still need different style files if they diverge on details like author-list truncation, the “et al.” threshold, or DOI/URL display.

Check what is already installed before searching for more

EndNote’s Cite While You Write style dropdown in Word only shows a short “favorites” list, not everything installed on your machine. Before treating a style as missing, open the full list: from EndNote’s desktop application, use Edit > Output Styles > Open Style Manager (the same command is reachable from Word’s style dropdown via Select Another Style…). The Style Manager lists every style currently installed, with a checkbox to mark ones you use often as favorites so they show up directly in the Word dropdown afterward. Many journal-specific requests turn out to already be installed under a name that does not obviously match the journal — a publisher’s own house style, or a generic style the journal explicitly endorses (Vancouver and APA cover a large share of journal instructions on their own). Search the Style Manager list by name before assuming a download is necessary.

Finding a style that is not in the bundled set

If the exact style genuinely is not installed, EndNote maintains an online output style search on its own site (endnote.com) that you can search by journal or publication name. A found style downloads as a single .ens file. Two things are worth checking before you trust a downloaded style outright: that it is dated recently enough to reflect the journal’s current guidelines (styles are user- and library-contributed and are not automatically kept in sync with a journal’s own instructions-for-authors page), and, for anything that matters for submission, a spot check of a formatted reference against a real, recently published article from that journal — the fastest way to catch a stale or slightly-off style before it costs you a revision request.

Installing a downloaded style

A downloaded .ens file is registered to open directly in EndNote’s Style Editor when you double-click it. From there, use File > Save (or Save As) to save it into your EndNote styles folder — once it is saved there, it appears in the Style Manager and becomes selectable from Word’s style dropdown like any bundled style. If your institution manages EndNote centrally and you do not have write access to the shared installation folder, EndNote also has a personal styles location under your own user profile that does not require administrator rights; saving there is the more reliable route on a managed machine. Either way, confirm the install worked by opening Style Manager and searching for the style’s name before closing out — a style that opened correctly in the editor but saved to the wrong location will not show up in Word, and that is the most common point this step actually fails.

Editing a style when no exact match exists

When the journal’s style is not published anywhere and the closest available style is only close, the fix is to customize a copy of that closest style rather than build one from scratch. Two things matter for doing this safely:

• Start from Save As, not Edit-in-place. Open the closest existing style (Edit > Output Styles > Edit “[style name]”, or select it in Style Manager and click Edit), then immediately use File > Save As to give it a new name before changing anything. This protects the original bundled style for other documents and other people who rely on it, and gives you a clean, identifiable style of your own to reuse.
• Edit the specific template that is wrong, not the whole style. The Style Editor’s left-hand navigation splits a style into independent sections — Citations (the in-text form), Bibliography (the reference-list form), Footnotes, Figures and Tables, and more. Each has its own field-code template (built from placeholders like author, year, and title, joined by literal punctuation you type in directly) plus separate settings for things like the author-list truncation rule and the “et al.” threshold. A journal that differs from your base style only in, say, using bold instead of italic for volume numbers, or listing up to six authors before “et al.” instead of three, needs one or two targeted changes in the Bibliography templates — not a rebuild of the whole style.

Common customization targets worth knowing about specifically: the author-list truncation and “et al.” rules (set per-template, not globally), whether DOIs or URLs are shown and how they are formatted, and the punctuation and italicization used for journal titles and volume/issue numbers. These are exactly the details instructions-for-authors pages tend to state precisely and generic styles tend to get only approximately right.

Applying and testing the edited style

Once saved, your customized style is selected the same way as any other — from Word’s EndNote tab style dropdown, or via Select Another Style… if it is not yet in the favorites list. Before relying on it for a real submission, format a short test document with a handful of your actual references, including any edge cases you know will come up (a reference with more authors than your truncation threshold, one with a DOI, one without), and compare the result line by line against a real citation from the target journal. A style that looks right on a simple one-author, one-year reference can still diverge on the cases that matter for your specific manuscript.

Frequently asked questions

What file extension do EndNote output styles use?

.ens. It is a self-contained template file, separate from your library file (.enl) and its attached .Data folder.

Will editing an output style change my stored references?

No. A style only controls formatting and display — how citations and the bibliography are built from your data. The underlying reference records in your library are unaffected by any style change or style edit.

Can I edit a bundled style directly instead of making a copy?

You can, but it is not the safer choice: editing in place changes that style for every document and, on a shared or managed installation, potentially every other user who selects it by name. Using File > Save As to create a distinctly named copy before editing keeps the original intact and makes clear which documents used the customized version.

Why does a style I downloaded and opened not show up in Word?

Opening a .ens file in the Style Editor does not install it — it only opens that one file for viewing or editing. It becomes selectable in Word only after it is saved into an EndNote styles folder (via File > Save or Save As inside the editor) and, if it is not appearing in the short dropdown list, added to favorites through Style Manager.

Is there one official style for a given journal, or several?

Often several exist with similar names, since output styles can be contributed or adapted by different institutions and are not centrally certified against a journal’s current instructions for authors. When in doubt, verify against the journal’s own current guidance and a recently published article rather than trusting a style’s name alone.