Paste your cover letter into the checker above and you get a 0-100 AI score in seconds, along with a verdict of "Reads as AI-generated", "Borderline" or "Reads as human-written". It is free, ten credits a day, and a check costs one credit whatever the length. No account, no login, no card, no email address. Then read the score for what it stands in for. You will usually never learn whether anyone ran a detector on your application at all. What you do know is that a recruiter is reading fast, and a letter that opens like every other letter in the stack gets skimmed. A high score is a reliable symptom of that problem, and the sentences behind it are usually the ones a tired reader stops seeing.
A person working through a stack of applications develops an ear for the average letter, and generated letters converge on that average by design. Two applicants using the same model and a similar prompt produce nearly the same document, and both letters land in the same inbox in the same week. Nobody has to prove anything about how a letter was written for it to lose on sounding familiar.
The first thing a reader registers is not vocabulary. It is the absence of facts. A generated letter talks about qualities: communication, adaptability, a proven track record. A letter written by the person applying talks about events, because the person remembers them. "Strong stakeholder management" and "I ran the Tuesday release call for eighteen months" make the same claim, and only one of them is checkable.
The opening line and the closing paragraph are where this shows first, because those are the two positions everyone templates. Someone screening applications for one role has very likely read your opening sentence already, in somebody else's letter.
A flagged essay comes with a process attached. There is an accusation, a person to answer, a policy with steps in it, version history you can produce, and usually an appeal. It is stressful and it is slow, but you get to argue.
A cover letter has no process. Nothing is alleged and nobody schedules a meeting. The application goes quiet, the role gets filled, and you never learn which sentence lost it. You cannot show a document history to a recruiter who has already moved on to the next candidate.
That changes what you are trying to do. With an essay you are defending authorship. With a cover letter you are competing for a few seconds of attention against everyone else who applied, some of whom used the same model you did. You do not need to prove you wrote it. You need it to be worth finishing.
The properties that push a score up are structural, and they cluster in application writing, because most people learned the same format from the same careers handout and then filled in the blanks.
The in-browser registry of named AI writing tells highlights these in your own text and marks the exact phrases a detector keys on. It is free and unlimited and it costs no credits, so you can paste a draft into it as often as you want while you edit.
Every fix below moves the score down and makes the letter better to read, which is the point. None of them require you to write badly on purpose.
Aim for something like 250 to 350 words in four short paragraphs. The free word counter will tell you where you are, and the readability checker will show you whether the sentences have gone stiff. Then read the whole thing out loud once. Sentences that were assembled rather than written are obvious in the mouth before they are obvious on the page.
Detectors measure style, not authorship. Plain, orderly, correct, formal prose scores high whoever produced it, and a cover letter is the most formal thing many people ever write. If you were taught a template and you follow it carefully, your letter has the exact properties that raise a score.
This falls hardest on people writing in a second language. Stanford HAI researchers (Liang et al., 2023) ran TOEFL essays by non-native English speakers through seven detectors and found 61% falsely flagged as AI-generated. Every one of those essays had a human author.
The response is the same list of edits. Specifics, real numbers, uneven sentence lengths and one concrete story move the score, and they also make a hiring manager stop scrolling. You are not writing around a machine. You are removing the parts of the letter that were never yours to begin with.
The checker needs at least 65 words, which any real cover letter clears easily, and it costs one credit per run no matter the length. It gives you the 0-100 score and the verdict. To see which phrases are carrying that score, paste the same text into the free registry of AI writing tells, which highlights them in place and costs no credits, so you can edit named sentences instead of arguing with a number.
The humanizer rewrites every sentence in one click. It handles 12,000 characters per run, roughly 2,000 words, so a cover letter fits several times over, and it costs one credit per 50 words with a 25-word minimum. Use it in this order: write your own specifics first, run the rewrite, then read the result once against your facts. A rewrite changes how the sentences are built and works only from the text you gave it, so the job history in the letter stays the job history you put in.
The free tier is 10 credits a day per network with no account, no login, no card and nothing to verify. The tells registry, the proofreader, the word counter, the readability checker, the AI vocabulary checker, the plagiarism and originality check and the signed drafting record are all free and unlimited.
On the policy question, employers differ. Some publish nothing about AI in applications, and some application forms ask you to declare any AI use. If a form asks, answer it honestly. Where an employer says AI is not permitted, that rule covers the draft however it was later edited. Read the one that applies to the job in front of you.
Some do, and a great deal of screening is still a person reading quickly. You will not be told which happened to your application. That is the argument for writing a letter that could only have come from you rather than one built to pass a check, since the specifics that bring a score down are the same specifics that make a recruiter read to the end.
Employers differ. Some publish nothing either way, and some application forms ask you to declare any AI use. If a form asks, answer it honestly. Where an employer states that AI is not permitted, that covers the draft however it was edited afterwards. Check the wording on the specific application.
Something like 250 to 350 words in four short paragraphs is a reasonable target for most roles. That is comfortably above the 65-word minimum the checker needs, so you can score a full letter, and the free word counter will show you where you are while you cut.
It rewrites the sentences you give it and works only from what is in them. Put your real numbers, employers and examples into the draft first, then run the rewrite, then read it once to confirm nothing shifted in meaning. A letter with no specifics in it will come back as a letter with no specifics in it.
There is no magic number to hit. Treat the score as a symptom check and the sentences as the real work. If the verdict comes back "Reads as AI-generated", run the letter through the free tells registry, look at the phrases it highlights, and ask what fact belongs where each generic phrase sits. That edit fixes both the score and the letter.
No. The free tier is 10 credits a day per network with no account, no card and no email address. A check is one credit whatever the length, a rewrite is one credit per 50 words, and the tells registry, proofreader, word counter, readability checker, vocabulary checker, originality check and drafting record are unlimited.