You paste a job advert, upload your resume, and a moment later a number appears. Sixty eight percent. It is easy to read that as a mark out of a hundred, the way a teacher would give one. It is not that, and knowing what sits behind the number changes how you should use it.
The score compares text, nothing more
A match score measures word overlap between two documents. The tool reads the advert, pulls out the terms that look meaningful to it, then counts how many of those terms also turn up in your resume.
Filler contributes almost nothing. A line such as "we are looking for a motivated individual to join our team" carries no weight, because those words appear in nearly every advert ever written. The words that carry weight are the specific ones: a job title, a piece of software, a qualification, a duty, the name of a system you have used. When people say a score is about keywords, this is what they mean.
What it can tell you
Used properly, the number works as a checklist. It can show you that the advert insists on a skill your resume never names, even though you have done that work for years. It can show you that your job title reads differently from theirs, which matters when a person is scanning quickly. It can show you that a whole area the advert keeps returning to is missing from your page.
All three are real, fixable problems, and a score is a fast way to notice them.
What it cannot tell you
It cannot tell you whether your experience is strong. Two resumes can hold the same words while one describes ten years of hard work and the other a single afternoon. The score reads both identically.
It cannot tell you whether a person will like your resume. Recruiters read for judgement, for gaps, for how clearly you write, and for whether your story makes sense next to the job. None of that survives being turned into a count of words.
It cannot tell you whether you will get an interview. Some employers screen with software, plenty do not, and a weak number from one tool reflects no decision any company has taken about you.
It also cannot tell you that a high score is safe. A resume can score well simply by repeating the advert back at the employer, which a human reader spots immediately and does not enjoy.
Why two tools give two different numbers
Different tools use different word lists, different weights, and different ideas about what counts as a match. One treats "managed" and "management" as the same word. Another looks for the exact phrase. One gives a bonus when the job title appears near the top. Another ignores position entirely.
The practical consequence is that numbers are not comparable between tools. A seventy from one is not better or worse than a fifty from another. What is comparable is the gap list, the set of terms the advert uses that your resume does not.
Even inside one tool, the same resume scores differently against two adverts for the same kind of job, because the two adverts are written differently. So treat the score as a direction to walk in, not a grade you have to lift.
How to use one without damaging your resume
Change only what is true. If the advert asks for something you genuinely have and your resume never mentions it, add it in a sentence that says what you did with it. If you do not have it, leave it alone. Claiming a skill you cannot discuss is a way to fail the interview you just earned.
Do not repeat a term just to raise the number. Software may count it twice. A person notices the third time.
Keep your job title close to theirs where that is honest. Customer support adviser and client services representative describe similar work, and using their wording costs you nothing.
Check the file itself as well. A plain single column document with normal headings parses cleanly, while tables, columns, text boxes, and artwork can break the reading altogether. If the tool cannot read the file, the score means nothing in either direction.
Run the check once per application, after you have tailored the page by hand. The score is a second opinion, not the first draft.
A sensible weekly habit
Pick one advert for a job you actually want. Read it twice with a pen, mark the terms that repeat, and check each one against your resume. Fix the honest gaps, leave the rest, then apply. Reading one advert properly for twenty minutes beats ten quick submissions sent the same evening.
That check is the part worth automating, because it is mechanical and easy to skip when you are tired. A resume to job advert check does this one job: it reads your file the way screening software does and shows the terms the advert uses that you are missing, so you can spend your attention on the writing instead.
The number is a tool, not a verdict. Use it to find what is missing, then go and write the part only you can write.
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