How to Make Your Resume ATS-Friendly and Check It Free

An ATS-friendly resume is one that software can read cleanly and that uses the same words as the job you're applying for. In practice that means a simple single-column layout, standard section headings, plain text instead of graphics, and the key skills from the job description written the way the employer writes them. You can check the keyword side in a couple of minutes with my free ATS resume checker, which compares your resume with a job description right in your browser.

I've spent years on both sides of this: reviewing developer resumes when hiring for projects, and writing proposals and profiles as a freelancer on Upwork and Fiverr. The pattern I keep seeing isn't that good people get "rejected by robots". It's that good people send a generic resume that doesn't clearly say what the job ad asked for. That's fixable.

What an ATS actually does

An applicant tracking system (ATS) is software employers use to collect, store, search and manage job applications. When you apply, it usually parses your resume into fields — name, contact details, job titles, dates, skills — so recruiters can search and filter candidates.

Two things follow from that:

Parsing has to work. If the software reads your two-column layout in the wrong order or skips text inside a table, your experience may look scrambled.

Search depends on words. A recruiter searching for "Kubernetes" or "project management" finds resumes that contain those words.

How much is automated varies a lot between companies and products. Some teams read every application; others lean heavily on filters and ranking. You can't know which one you're dealing with, so the sensible approach is to make your resume work well for both a parser and a person skimming quickly.

A note on numbers: you'll often see dramatic claims about what percentage of resumes an ATS "rejects". I haven't seen a solid, verifiable source for those figures, so I won't repeat them. You don't need scary statistics to justify writing a clear, well-targeted resume.

How to make your resume ATS-friendly, step by step

1. Start from the job description, not your old resume

Read the job ad and highlight the hard requirements: tools, languages, certifications, job titles, domain terms. Those are your target keywords. Harvard's career services guide makes the same point in its advice on tailoring — use keywords from the job description and keep the resume specific and fact-based.

2. Use standard section headings

Stick to headings software and people both expect:

Summary (2–3 lines)

Experience (or Work History)

Skills

Education

Optional: Projects, Certifications

Creative headings like "Where I've Made Magic" are harder for a parser to map to the right field.

3. Mirror the employer's wording — honestly

If the ad says "REST APIs" and your resume says "web services", use "REST APIs" where that's what you actually built. If they say "Node.js", don't only write "Node". Match spelling and abbreviations, and where it helps, include both forms once: "Continuous Integration / Continuous Delivery (CI/CD)".

The important word is honestly. Adding skills you don't have might get you past a filter, but it falls apart in the first technical conversation.

4. Put keywords where they carry weight

Don't just dump a long keyword list at the bottom. Spread the important terms naturally:

In your summary, the two or three skills the role is built around.

In your skills section, the full list of relevant tools.

In your experience bullets, showing where you used them: "Built REST APIs in Node.js serving the mobile app".

5. Show results with real numbers

Bullets that include scale, speed or outcomes are easier to believe and easier to skim. Use numbers you can stand behind — team size, number of users, time saved, releases shipped. If you don't have a precise figure, don't invent one; describe the scope instead.

6. Check it against the job description

Paste your resume and the job ad into the free ATS resume checker. It shows a keyword match score, the matched and missing keywords (most important first), and simple checks for headings, contact details, length, metrics, long paragraphs, symbols and first-person pronouns. Everything runs in your browser — your resume never leaves your device.

Treat the score as a guide to gaps, not a verdict. There's no universal "good ATS score"; every tool and every ATS calculates it differently.

7. Save a tailored copy for each application

Keep a master resume with everything, then make a short tailored version per job. If you want to see exactly what you changed between versions, a text diff checker makes that obvious, and the word counter helps when you need to trim.

Formatting: do's and don'ts

Do	Don't
Use a single-column layout	Put key content in two or three columns
Use standard headings (Experience, Education, Skills)	Invent creative section names
Use simple round or dash bullets	Use icons, emoji or decorative symbols as bullets
Put contact details in the main body as plain text	Hide your email and phone in a page header, image or text box
Use a common, readable font	Use unusual display fonts for body text
Write dates consistently (e.g. "Jan 2022 – Mar 2024")	Mix date formats or leave dates out
Keep paragraphs short and use bullets	Write long blocks of text for each role
Submit the file type the application asks for	Assume every system handles every format equally

A quick self-test: copy all the text out of your PDF and paste it into a plain text editor. If it comes out jumbled, in the wrong order, or with missing sections, a parser may struggle with it too.

Tips specifically for developers

Developer resumes have their own traps. These are the ones I notice most when reviewing them.

Spell tech keywords the standard way

Use the names the ecosystem uses: "C#", ".NET", "Node.js", "TypeScript", "PostgreSQL", "CI/CD", "Kubernetes". Watch for variations the job ad uses — "React" vs "React.js", "GCP" vs "Google Cloud" — and include the employer's version where it's accurate.

Group your skills, but keep it scannable

A flat list of 40 technologies is hard to read. Group them instead:

Languages: C#, TypeScript, SQL

Frameworks: ASP.NET Core, React, Next.js

Data: SQL Server, PostgreSQL, Redis

DevOps: Docker, GitHub Actions, Azure

Only list things you'd be comfortable being asked about in an interview.

Tie technologies to outcomes

"Used React" says little. "Rebuilt the customer dashboard in React and TypeScript, cutting support tickets about the old UI" says what you did and why it mattered. Each role should read as problems solved, with the stack as supporting detail. My own path from desktop apps to web platforms, in From C# Desktop Apps to Enterprise SaaS, is a good example of describing experience by what was built rather than a list of tools.

Make your GitHub and portfolio links easy to find

Put your GitHub, portfolio and LinkedIn URLs as plain text near your contact details — for example github.com/yourname — rather than only as a hyperlinked icon. Link to repositories or live projects that are relevant to the job, and make sure the README explains what the project does. A reviewer who clicks through should land on something that backs up your resume.

Don't let the skills section do all the work

Keyword matching may pull a skill from anywhere in the document, but a human reviewer wants to see where you used it. If "Docker" appears only in your skills list and nowhere in your experience, that's worth fixing.

Common mistakes I see

One resume for every job. The easiest improvement is tailoring the summary and top bullets to each role.

Keyword stuffing. Repeating a skill ten times or pasting the job ad in white text doesn't make you a stronger candidate, and people notice.

Too long or too thin. Very short resumes don't give enough evidence; very long ones bury the important parts. Trim older roles to a line or two.

First-person narrative. Start bullets with a verb — "Built", "Led", "Reduced" — instead of "I was responsible for".

FAQ

What is an ATS-friendly resume?

It's a resume that applicant tracking software can parse correctly and that uses the job description's key terms. In practice: single column, standard headings, plain-text contact details, simple bullets and relevant keywords written the way the employer writes them.

What is a good ATS score?

There's no universal standard — every checker and every ATS scores differently. As a rough guide, if a checker shows you already cover most of the job's key terms, focus on quality; if many important requirements are missing, tailor the resume before applying.

Is it safe to paste my resume into an online ATS checker?

It depends on the tool. My ATS resume checker runs entirely in your browser, so your resume and the job description are never uploaded or stored. For other tools, check their privacy policy before pasting personal details.

Should I use a PDF or Word file?

Use whatever the application asks for. If there's no instruction, either is usually fine as long as the text is selectable and copies out in the right order — test that by pasting it into a plain text editor.

How many keywords should I include?

There's no magic number. Include every important skill from the job description that you genuinely have, using the employer's wording, and place them naturally in your summary, skills and experience bullets.

Do developers need a different resume format?

The format is the same, but the content differs: standard spellings of technologies, a grouped skills section, bullets that tie tools to outcomes, and plain-text GitHub and portfolio links near your contact details.