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.

Common questions about cover letter basics

Do I need a cover letter if the submission system doesn’t require one?

Yes. Most submission systems mark the cover letter field optional, but ICMJE-follower journals still expect its four declarations — redundant publication, competing interests, authorship approval, corresponding-author contact — somewhere in the package. If the system has no dedicated upload for it, put the declarations in the letter anyway rather than assuming an optional field means the journal doesn’t want them.

Can reviewers see what I wrote in my cover letter?

Sometimes. Some journals route the full submission bundle to reviewers, including the cover letter, rather than a curated reviewer-only view. Treat anything you write as visible to a reviewer, not only the handling editor, and never put a claim, a complaint, or a reviewer-exclusion reason in the letter that you would not defend to that person directly.

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 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.

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.

The redundant-publication declaration and the preprint declaration are not the same test, and conflating them is a common mistake. ICMJE defines duplicate publication as “publication of a paper that overlaps substantially with one already published, without clear, visible reference to the previous publication” — the operative words being already published and without clear, visible reference. The same guidance then says plainly that the recommendation “does not prevent a journal from considering a complete report that follows publication of a preliminary report, such as a letter to the editor, a preprint or an abstract or poster displayed at a scientific meeting.”

So a preprint, a meeting abstract or a conference poster is a preliminary report to name, not a redundancy to confess, and an author who has posted one has nothing to answer for under the redundancy clause. Name it in the sentence built for preprints, where ICMJE puts the duty squarely on the author: “It is the author’s responsibility to inform a journal if the work has been previously posted on a preprint server.” What the redundancy clause does target is the case ICMJE spells out — work “already been reported in large part in a published article” — and there the letter must not only declare the overlap but supply the related material with it.

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.

A specialist wrinkle worth naming: some journals invite a presubmission inquiry — a short query, sent before the full manuscript is prepared, asking whether the work is worth submitting at all. Where you sent one and an editor replied encouragingly, the cover letter is the place to say so, with the date: “Following the response to our presubmission inquiry of [date].” That sentence is a fact about the correspondence rather than an argument, and it spares the handling editor re-deciding a question the journal has already answered once. Check the journal’s own instructions for whether it takes such inquiries and where they go; the practice is not universal, and at a journal that does not offer it the reference simply has nothing to point at.

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.

Questions about journal-specific cover letter rules

Can I reuse the same cover letter after a rejection, just changing the journal name?

No. Beyond the risk of leaving the wrong journal’s name in the text, a reused letter carries the venue argument written for the journal that rejected it. Rewrite paragraph three against the new journal’s own recent contents, and if the manuscript was formally transferred within a publisher’s portfolio, say so plainly rather than presenting it as a first submission.

What if the masthead doesn’t tell me who the handling editor is?

Address the letter to “Dear Editors” or the journal’s stated generic address rather than guessing a name. Large journals that rotate handling editors weekly often don’t publish who is on duty for a given week, and naming a specific editor who isn’t actually assigned — or one who has since left the journal — reads as a template that was never checked against the current masthead.

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 directly; many journals assign a rotating handling editor instead. The content is 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.

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.

One design changes this paragraph entirely. A Registered Report submitted at Stage 1 is reviewed before the data are collected, so there is no finding for the claim paragraph to state. The Stage 1 submission carries an introduction, the methods, and the results of any pilot work that motivated the proposal; what it does not carry is the result a letter would normally lead with. Describe the question and the design instead — what will be measured, in what system, and what outcome would distinguish between the competing hypotheses — and say plainly that the manuscript is a Stage 1 protocol under review before the data exist. A Stage 1 review that goes well ends in in-principle acceptance, a commitment to publish the study if the approved protocol is followed, whatever the results turn out to be. That is why naming the format explicitly matters: an editor who opens a Stage 1 letter expecting a finding will misjudge it as thin rather than recognise it as complete for its stage.

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.

Submitting to a special issue or thematic collection changes what “specific” means. The venue argument should cite the call’s stated scope and, where named, the guest editors’ own recent work in the area — not the parent journal’s general aims and scope. A letter arguing fit against the journal’s regular remit when the actual venue is a guest-edited issue is arguing the wrong case entirely, and an editor assigned to the special issue reads it as evidence the author didn’t check which call the manuscript was submitted under.

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. Finding referees who are qualified, available and free of conflicts is the slowest step in getting a manuscript assigned, and a short list of names an editor can check quickly contributes to that step rather than trying to influence it.

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.

Treat the list as advisory rather than a request the editor is bound to honour, and note that the reservation runs in the other direction too. PLOS ONE, inviting authors to name editors and reviewers who should not handle the manuscript, commits only that “We will respect your request so long as it does not interfere with the objective and thorough assessment of the submission.” If even an explicit exclusion is honoured conditionally, a suggestion carries no obligation at all, and nothing follows from an editor choosing referees you did not name. What does damage a submission is an address that fails verification, or a conflict you did not declare.

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.

Questions about suggesting peer reviewers

How many reviewers should I suggest in my cover letter?

Three to five names is the range most journals ask for, each with an institutional email address and one line on why that person is qualified. Fewer than three gives the editor little to work with; more than five starts to look like you are choosing your own referees rather than proposing candidates for the editor to vet independently.

Is it okay to suggest a reviewer I’ve never actually met?

Yes. The suggestion only needs to name someone qualified and uncompromised, not someone you know personally. What disqualifies a name is a relationship, not its absence: co-authorship inside the journal’s stated window, a shared institution, shared funding, or an active collaboration. Declare any of those; don’t suggest around them by picking a stranger in the field instead.

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. Where the publisher’s cascade program carries reviews forward automatically, the letter is also the place to say whether you want the receiving editor to rely on those reviews as-is or to treat the manuscript as fresh where the journal’s policy allows that choice — silence is usually read as accepting the carried-over reviews.

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.

Common questions about resubmission and disclosure

Do I have to mention that another journal already rejected this paper?

Only if the current journal’s instructions ask, or the manuscript is substantially the same work. ICMJE guidance encourages including previous reviewers’ comments when resubmitting elsewhere, and volunteering that history reads as confidence rather than concealment. It’s undisclosed overlap with a submission still under review somewhere else that draws an integrity query, not a disclosed prior rejection.

I forgot to mention that my paper is already posted on bioRxiv — what happens now?

Email the handling editor before the journal’s checklist catches it, rather than waiting to be asked. An undeclared preprint is a routine finding, not usually a rejection trigger on its own, because nearly every major journal now permits preprinting before submission — but a self-reported correction reads very differently from an editorial assistant finding the bioRxiv DOI first.

My paper is being transferred to a different journal in the same publisher’s portfolio — do I need to write a new cover letter?

Yes. A transferred manuscript needs a letter rewritten for the receiving journal’s readership, not the one carried over from the journal that redirected it. State plainly that the paper was transferred, note whether the previous reviews are included, and replace the venue paragraph entirely — arguing for the first journal’s readership at the second is the single most common transfer mistake.

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.

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