How to write a cover letter to a journal editor

A cover letter to a journal editor is a one-page statement naming what the manuscript claims, why that claim belongs in this journal, and which disclosures the journal requires — redundant publication, preprints, competing interests, authorship approval. The letter is read once, at desk screening, by an editor deciding whether to send the paper out for review.

That is the whole function, and most cover letters fail it in the same two ways: they paraphrase the abstract, which the editor has already read, and they assert fit in language that would fit any journal. This page covers what the International Committee of Medical Journal Editors requires the letter to contain, what individual journals add, a paragraph-by-paragraph structure, how to state a claim without overclaiming, reviewer suggestions and exclusions, how to detect a weak letter in your own submission, and what editors write back when the letter is mishandled.

What the cover letter is actually for

The cover letter carries two jobs that no other part of a submission carries: a set of formal declarations the journal is obliged to collect, and an argument about venue that the manuscript itself cannot make.

The declarations are administrative and non-negotiable. The argument about venue is the only place in the entire submission where you may address the editor directly about why this paper suits this readership, and it is the part authors most often waste on paraphrase.

Two mechanical facts shape how the letter should be written. First, most submission systems — Editorial Manager, ScholarOne Manuscripts, eJournalPress — either render the letter as plain text or paste it into a notification email to the handling editor, so bold text, tables and multi-level bullets frequently do not survive. Write in plain paragraphs. Second, the letter travels with the manuscript when a publisher offers a cascade or transfer to a sister journal, which is why a letter that names its first-choice journal three times arrives, unedited, at the second-choice journal. Reviewer objections about scope and transfer offers are common enough that this is a real and recurring embarrassment.

Assume the letter is visible to everyone in the editorial workflow, including reviewers in journals that share the submission package. Do not write anything in it you would not want a reviewer to read.

What the ICMJE requires the letter to contain

The ICMJE Recommendations set out, in the section “Sending the Manuscript to the Journal”, four items a submission letter should carry. These are the baseline that most biomedical journals build on, and the wording matters because journals enforce them literally.

The first is a declaration about overlap. The ICMJE requires “a full statement to the editor about all submissions and previous reports that might be regarded as redundant publication of the same or very similar work”, and its guidance on overlapping publications is more explicit still: where work is “contained in or closely related to another paper that has been submitted or accepted for publication elsewhere, the letter of submission should clearly say so and the authors should provide copies of the related material to help the editor decide how to handle the submission.”

The second is a conflict-of-interest statement, where that information is not already captured in the manuscript or a disclosure form. The third is a statement that all authors have read and approved the manuscript and meet the authorship criteria. The fourth is contact information for the author responsible for communicating with co-authors about revisions and final approval of proofs.

The ICMJE also requires preprint disclosure: “Authors should inform a journal if the work submitted to the journal has been posted on a preprint server and provide a link to the preprint, whether the posting occurs prior to submission or during the peer-review process.” Posting to bioRxiv, medRxiv, arXiv, SSRN or Research Square before submission is compatible with almost every journal’s policy — failing to declare it is not.

What individual journals add

Individual journals extend the ICMJE baseline in ways that are specific, published, and routinely ignored by authors who reuse a template.

PLOS ONE, for example, requires the cover letter as a separate uploaded file and states a hard limit: “Upload a cover letter as a separate file in the online system. The length limit is 1 page.” Its instructions then ask the letter to summarise the study’s contribution to the scientific literature, relate the study to previously published work, specify the article type — “for example, research article, systematic review, meta-analysis, clinical trial” — describe any prior interactions with PLOS about the manuscript, suggest appropriate Academic Editors, and list any opposed reviewers.

None of those six items appears in the ICMJE’s four-item list. Only the article type is mentioned anywhere in that ICMJE section, and there only as an example of “additional information that may be helpful to the editor.” Naming the article type matters because it routes the submission to a different checklist; naming prior interactions matters because a manuscript previously rejected from a PLOS journal or transferred within the portfolio has a history the editor can see and would rather you acknowledged.

Read the target journal’s own instructions before writing, not a generic template, and read them for the current submission year. Journal selection governs which instructions you are reading, and the practical work of assembling a compliant submission is covered in journal submission.

A structure that works

A cover letter of five paragraphs, kept to one page, covers every requirement above without repeating the abstract.

Paragraph one — the submission line. Name the article type, the title in full, and the journal. “We submit the enclosed Research Article, Title, for consideration in Journal.” One sentence. Add the salutation from the masthead: address the named editor-in-chief or handling editor if the journal assigns one, and “Dear Editors” if it rotates handling editors weekly, which many large journals do. Naming an editor who left the journal two years ago is a small signal, but it is a signal.

Paragraph two — the claim. Three to five sentences stating what was done, in what system, what was found, and the boundary of the finding. This is the paragraph that must not be an abstract paraphrase.

Paragraph three — the venue argument. Why this journal’s readership, specifically. Reference the journal’s own recent contents rather than its aims and scope page.

Paragraph four — the declarations. Overlap, preprint status with a DOI or link, prior submission history where relevant, competing interests, authorship approval, and any ethics or registration identifiers the journal asks for in the letter rather than the manuscript.

Paragraph five — the close. Suggested and opposed reviewers if the journal invites them, and the corresponding author’s contact details.

Writing the claim paragraph

The claim paragraph fails when it restates the abstract, and it fails differently when it inflates. Both are visible to an editor within a sentence, and the second is worse, because the editor will check.

A weak version: “We report a novel and comprehensive analysis revealing for the first time that TREM2 signalling plays a critical role in microglial responses, with important implications for neurodegenerative disease.”

A stronger version of the same finding — invented here purely to show the wording: “Using conditional deletion in three mouse lines and single-nucleus RNA sequencing of 41,000 microglia, we show that TREM2 loss blocks the transition to the disease-associated microglial state after demyelinating injury but not after amyloid deposition. The effect is injury-specific, which reconciles two conflicting reports in the literature.”

The second version names the system, the measurement, the direction of the effect, and — decisively — its limit. Stating a boundary is not modesty; an editor reads an unbounded claim as one the authors have not tested, and a bounded one as a claim that survived the test. The words that most often signal the first version are novel, comprehensive, paradigm-shifting, critical role, for the first time and sheds light on. Check each against what the data actually support before it reaches an editor; our overclaim check does exactly this pass on a manuscript and its abstract.

A priority claim deserves particular care. “The first demonstration of X” is checkable in under a minute, and an editor who finds a 2019 paper reporting X will discount everything else the letter says.

Making the venue argument specific

The venue argument is the paragraph that distinguishes a written cover letter from a filled-in template, and the test is simple: delete the journal name and see whether the paragraph still fits any journal in the field. If it does, it is decorative.

A specific version cites the journal’s own record, with real papers in place of the brackets. “Journal published [first author] et al. on activity-dependent myelination last year and [first author] et al. on oligodendrocyte heterogeneity the year before; our result connects those two literatures by showing that the heterogeneity they describe is activity-dependent.” That sentence tells the editor which section the paper belongs in, which handling editor should take it, and which reviewers know the area — three decisions the editor has to make anyway.

Do not claim broad significance to justify a specialist venue, and do not claim mechanistic depth to justify a broad one. Journals reject on mismatch in both directions, and a letter arguing for the wrong kind of importance advertises the mismatch. Where the mismatch is real rather than rhetorical, the fix is a different journal, not a better letter — see desk rejected without review for the five causes and how to tell them apart from the letter you receive back.

Suggesting and opposing reviewers

Suggested reviewers belong in the cover letter when the journal invites them, and the invitation is a genuine request for help rather than a formality: editors of specialist journals routinely issue several invitations for every review they secure, so a list of qualified, uncompromised names shortens the time your manuscript sits unassigned.

Supply three to five names with institutional email addresses and one line each on why that person is qualified. Use the address on the person’s institutional page, never a personal webmail account. This is not pedantry. BioMed Central retracted 43 papers in March 2015 after an investigation into fabricated peer review; the retraction notices state that a third party was involved in supplying “fabricated details of potential peer reviewers”, and BMC attributed some of the manipulation to third-party agencies offering language-editing and submission assistance. Publishers responded by tightening how suggested reviewers are checked, and a personal webmail address attached to a named professor is the pattern those checks look for.

Declare any relationship that disqualifies a suggestion — co-authorship within the journal’s stated window, usually three to five years, shared institution, shared funding, or a current collaboration. An undeclared conflict discovered later is worse than the reviewer you lost.

Opposed reviewers are permitted by most journals, usually capped at two or three. Give a reason in one clause — a documented dispute, a direct competitor working on the same unpublished system — and give no more. A long list of exclusions, or an exclusion accompanied by a paragraph of grievance, reads as a prediction that the paper will not withstand scrutiny. Finding peer reviewers covers how editors actually build a referee list, which is useful context for judging how many names to offer.

Cover letters for resubmissions, transfers and appeals

A resubmission cover letter does a different job from a first-submission letter, and conflating the two loses authors a round.

After a desk rejection for a formal requirement, the letter states precisely what was missing and what has been added, item by item, with a location. “The trial registration identifier (NCT number) now appears in the abstract and in Methods, page 6” is the whole paragraph.

After a transfer within a publisher’s portfolio, the letter should be rewritten for the receiving journal rather than carried over. State that the manuscript was transferred, whether the previous reviews are included, and what has changed since. A letter still arguing for the first journal’s readership is the single most common transfer error.

After a rejection following review, at a new journal, declare the prior submission if the journal asks, and say what the reviews changed. ICMJE guidance encourages including previous editors’ and reviewers’ comments when a manuscript is submitted elsewhere. The response document itself is a separate craft, covered in how to write a response to reviewers, and the decision about whether to resubmit at all is covered in rejected after review, what next.

An appeal is not a cover letter and should not be written as one. See when to appeal a rejection for the threshold and the format.

How to detect a weak cover letter in your own submission

Five tests catch most of the defects in a cover letter, and all five can be run in ten minutes on a finished draft.

The journal-name deletion test. Remove every occurrence of the journal’s name and read the letter. If nothing in it now points at a particular venue, the venue paragraph is decorative and should be rewritten against the journal’s recent contents.

The abstract-overlap test. Highlight every sentence in the letter that appears in the abstract in substantially the same words. If more than roughly a third of the letter lights up, the letter is a paraphrase of a document the editor has already read.

The claim-verb audit. List every instance of first, novel, unprecedented, comprehensive, critical, definitively and establishes. For each one, name the figure or table that supports it. Delete the ones with no answer.

The checklist tick. Open the target journal’s author instructions in one window and the letter in the other, and tick each required statement. Missing statements are the desk-rejection category that is entirely within your control, and the one that returns a manuscript without any judgement of the science having been made at all. Ethics, consent and data-sharing statements are a frequent gap; ethics and data sharing covers what a complete set looks like.

The last-paragraph test. Read the final paragraph alone. It should contain the corresponding author’s name, institutional email and, where the journal asks, a phone number. Editorial offices contact the corresponding author; a letter that does not identify one clearly creates a delay before anyone has read the science.

What editors write back when it is mishandled

Editorial correspondence about a defective cover letter is formulaic, and recognising the wording tells you which of several different problems you have.

“Your submission has been returned because it does not include the statement of prior publication required by our policy. Please resubmit with a complete cover letter.” — a formal-requirement return, reversible within a day, and no judgement of the work.

“We note that this manuscript is closely related to a paper currently under consideration at another journal, which was not declared at submission. Please clarify the relationship between the two.” — an integrity query, and the one that requires the most careful answer.

“Please confirm whether this work has been posted to a preprint server and, if so, provide the DOI.” — routine, and avoidable by declaring it unprompted.

“The suggested reviewers could not be verified at the addresses provided.” — a routine check at large publishers, and one that colours the editor’s reading of everything else.

“The cover letter states that this is the first report of [finding]; we note that [citation] described this in 2021.” — a priority claim that did not survive one search.

“Your cover letter does not indicate why the work is appropriate for the readership of this journal.” — usually the last sentence before a desk rejection on fit.

Reviewers who see the submission package occasionally comment on it directly, and a letter that promises a mechanism the manuscript does not deliver is worth pre-empting. A mismatch between what the letter promises and what the paper delivers is the defect an experienced editor notices first, because the two documents are read minutes apart.

Honest limits of the cover letter

We have not found a published, journal-sourced dataset showing that a well-written cover letter changes the probability of passing desk screening, and journals do not release desk-screening data at the level that would settle it. Treat the advice on this page as reasoning from published journal requirements and from what editors write back, not from a measured effect.

Three further limits are worth stating plainly. A cover letter cannot repair a fit problem: an editor who judges the paper wrong for the readership will not be argued out of it, and the correct response is a different journal. Some journals do not read the letter at all, having replaced its content with structured submission-form fields that collect the same declarations. And a letter cannot make a claim true — the priority assertion, the significance claim and the mechanism promise are all checked against the manuscript, and the check is the point at which an inflated letter becomes a liability rather than a neutral document.

What the letter reliably does control is the administrative category. Missing declarations return manuscripts. Undeclared overlap and undeclared preprints raise integrity queries. Unverifiable reviewer addresses trigger checks. Those outcomes are certain, mechanical and entirely within the author’s control, which is a better reason to write the letter carefully than any claimed uplift.

Where a journal’s policy on AI assistance requires a statement, check whether it belongs in the letter or in the manuscript — journals differ, and a few ask for it in the cover letter specifically. Journal policies on AI in peer review covers the current wording.

Related

Journal submission · Journal selection · Desk rejected without review · How to write a response to reviewers · Why papers get rejected

Checked before submission by the overclaim check, which compares the strength of the claims in your abstract and manuscript against the evidence presented, so the claim paragraph of your letter can be written to something the paper actually supports.

Review my manuscript

Frequently asked questions

What should a journal submission cover letter say?

A journal submission cover letter should name the article type and title, state the central claim with its boundary, argue why this journal’s readership specifically, and carry the declarations the journal requires — redundant publication, preprint status with a link, competing interests, authorship approval, and corresponding-author contact details. One page.

How do you write a cover letter for a manuscript?

Write five short paragraphs on one page: the submission line naming article type and journal; the claim, stating system, finding and limit without paraphrasing the abstract; the venue argument citing the journal’s own recent papers; the required declarations; and the close with suggested reviewers and contact details.

What is the correct format for a cover letter to an editor?

Plain paragraphs on journal or institutional letterhead, one page, addressed to the named editor from the masthead or “Dear Editors” where handling editors rotate. Avoid bold text, tables and nested bullets, because submission systems frequently render the letter as plain text or paste it into an email.

How do I write a cover letter to the editor-in-chief of a journal?

Address the editor-in-chief by name only if the masthead shows that person handles submissions; many journals assign a rotating handling editor. Keep the content identical either way: article type, bounded claim, specific venue argument, required declarations, contact details. Seniority of the addressee changes nothing about what the letter must contain.

What goes in a cover letter when submitting a paper?

The ICMJE lists four items: a full statement about submissions and previous reports that might be regarded as redundant publication, a conflict-of-interest statement, confirmation that all authors have read and approved the manuscript and meet authorship criteria, and contact information for the corresponding author. Preprint postings must also be declared with a link.

How should a cover letter to a journal editor be structured?

Structure it so each required element sits in its own paragraph and can be found without reading the whole letter: submission line, claim, venue argument, declarations, close. Editors read the letter once while deciding whether to send the paper out, so anything that requires a second pass to locate is effectively absent.

How long should a cover letter to a journal be?

One page, and some journals state that as a rule — PLOS ONE’s instructions read “The length limit is 1 page.” A longer letter is not read more carefully; it is read less carefully, because the editor is looking for the claim, the venue argument and the declarations, all of which fit comfortably in about 400 words.