Cover Letter Formatting for ATS: File Type, Length, and Layout

Here is a fact that trips up thousands of applicants every week: the software reading your cover letter often cannot see the contact details you put at the very top of the page. Put them in the document header, and many parsers skip them entirely.

Most advice about cover letters obsesses over what to say. That matters, of course. But if an Applicant Tracking System (ATS) mangles your file before a human ever opens it, the finest prose in the world will not save you.

This guide covers the mechanics: file type, length, layout, and the small UK conventions that quietly sink applications. Get these right and your words actually reach the recruiter. For the full picture, read our full ATS cover letter guide.

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The file format question everyone gets wrong

When a job ad does not specify a file type, applicants default to PDF because it looks tidy and locks the formatting. That instinct is reasonable, but it is not the safest choice for machine reading.

Word documents remain the most reliable format across the widest range of ATS platforms. A .docx file has a clean, predictable structure that virtually every parser was built to read. PDFs vary wildly depending on how they were generated, and image-based or heavily designed PDFs can return gibberish.

The rule is simple: if the advert does not tell you which format to use, submit a .docx. If it names a format, follow that instruction to the letter. Recruiters notice when you ignore the brief.

File format comparison

Format	ATS parse reliability	When to use	Main risk
.docx	Highest, near universal	Default when no format is specified	Layout can shift slightly between Word versions
.pdf	Good, but inconsistent	Only when the ad explicitly asks for PDF	Image-based or designed PDFs parse as gibberish
.txt	Perfect text capture, zero formatting	Plain-text application portals or email bodies	No structure, so it reads as a wall of text
Pasted into a form	High, if you paste plain text	When the portal gives you a text box	Rich formatting breaks; line breaks vanish

Never submit an old .doc file or a Pages document. The former is legacy and parses unpredictably, and the latter is not recognised by most UK recruitment systems at all.

Key Takeaway: When the ad is silent on format, send a .docx. Reserve PDF for when it is explicitly requested, and never assume a designed PDF will read cleanly.

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Why your contact details keep disappearing

This is the surprising one. Many people place their name, phone number, and email in the document header, the special region at the top that repeats on every page. It looks professional in Word. The problem is that a large share of ATS parsers ignore header and footer regions completely.

The parser is trained to read the main body of the document. Anything tucked into the header, the footer, or a floating text box sits outside that reading zone. Your carefully typed email address becomes invisible, and the recruiter's system logs an applicant with no way to contact them.

The fix takes ten seconds. Type your contact details as normal text in the body of the document, at the very top, before your opening line. Never rely on the header area for anything a machine needs to read.

Key Takeaway: Keep your name, phone, and email in the body text, not the document header. If a parser skips the header, you have effectively submitted an anonymous application.

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Layout: single column and nothing clever

ATS parsers read in a straight line, top to bottom, left to right. The moment you introduce a second column, a table, or a text box, you scramble that reading order. A two-column layout can cause the parser to read straight across both columns, blending unrelated sentences into nonsense.

So the layout brief is short and strict:

• Single column only. No sidebars, no split layouts.
• No tables. Even a one-cell table used for alignment can confuse a parser.
• No text boxes. Content inside them is frequently skipped.
• No graphics, logos, icons, or images. They carry no readable text and add file weight.
• No headers or footers for anything essential.

Fonts that will not betray you

Stick to standard, widely installed fonts. Arial, Calibri, Georgia, and Times New Roman all parse cleanly and render the same on the recruiter's screen. A decorative or downloaded font may not be embedded properly, and when it fails it can substitute characters that break the text.

Keep the body between 10.5 and 12 point, with clear line spacing. Bold is fine for emphasis in moderation. Avoid coloured text, and never use light grey on white, which some scanners and every tired recruiter will struggle to read.

Key Takeaway: One column, standard fonts, and nothing fancy. Every table, text box, or graphic you remove is one less thing for the parser to trip over.

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Length: shorter than you think

A cover letter is not an essay. Recruiters spend seconds on the first pass, so aim for 250 to 400 words that comfortably fit on a single page. Anything longer signals that you cannot prioritise.

Three or four tight paragraphs do the job. Open with the role and why you want it, prove your fit with one or two concrete achievements, then close with a clear call to action. If it spills onto a second page, cut, do not shrink the font.

Length discipline also helps the parser. A short, well-structured document gives the ATS less room to misread, and gives the human a document they will actually finish. Tools like CVPilot flag when your letter drifts past the ideal length.

Key Takeaway: Target 250 to 400 words on one page. Brevity reads as confidence, and it leaves the parser less to misinterpret.

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Section order the machine expects

Parsers and humans both read faster when the structure is predictable. Use a standard, top-to-bottom order rather than an inventive layout.

1. Your contact details as body text at the top.
2. The date and, where relevant, the employer's name and address.
3. A clear greeting, ideally to a named person.
4. Opening paragraph stating the role and your hook.
5. Body paragraphs with evidence of your fit.
6. Closing paragraph and a professional sign-off.

This order is not just tradition. A conventional structure lets the parser map each block to the field it expects, which improves how accurately your details are captured into the recruiter's database.

Key Takeaway: Follow the conventional order from contact details to sign-off. Predictable structure is easier for both the software and the reader to process.

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The "paste into the form" case

More portals now ask you to paste your letter into a text box rather than upload a file. This looks convenient, and it removes file-parsing risk entirely, but it introduces a different trap. Rich formatting almost always breaks when pasted into a plain-text field.

Bullet points turn into stray symbols, bold vanishes, and line breaks can collapse into one dense paragraph. The safe method is to paste from a plain-text version first, then re-add spacing by hand. Keep a .txt copy of your letter ready for exactly this scenario.

After pasting, always scroll through the preview if one is offered. What looks fine in your document can arrive as a scrambled block, and you only get one submission.

Key Takeaway: For paste-in forms, work from a plain-text version and check the preview. Assume all formatting will strip, and rebuild the spacing manually.

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Naming the file so it survives the pile

A file called coverletter.docx or Document1.docx tells a recruiter nothing and gets lost the instant it lands in a shared folder. Name the file with your full name, the word "Cover Letter", and ideally the role.

A clean pattern works every time: Jane-Smith-Cover-Letter-Marketing-Manager.docx. Use hyphens or underscores rather than spaces, since spaces can turn into awkward code in some systems. A clear file name signals care before the document is even opened.

Key Takeaway: Name the file with your name and the role. It survives the download folder and quietly shows attention to detail.

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UK conventions worth knowing

British hiring norms differ from those in some other markets, and getting them wrong can raise a quiet red flag. Three rules stand out.

• No photo. UK employers avoid photos to reduce bias risk, and images add nothing a parser can read.
• No date of birth. Age is protected under the Equality Act 2010, so leave it off entirely.
• No full home address. Your town and county are plenty. A full postal address is dated and a minor privacy risk.

These omissions keep the document lean and compliant with UK expectations. Recruiters here expect a professional, personal-data-light letter, and anything more can look like a template imported from abroad. A quick check with CVPilot catches these conventions automatically.

Key Takeaway: In the UK, leave off the photo, date of birth, and full home address. Town and county are enough, and less personal data means a cleaner, safer letter.

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Bringing it together

Formatting is the part of the application you fully control. Send a .docx when no format is named, keep contact details in the body, use a single column with standard fonts, and hold the length to one page. Follow the conventional section order, name the file properly, and respect the UK conventions.

None of this is glamorous, but it is the difference between a letter that reaches a human and one that dies in a parser. Getting the mechanics right frees your words to do their job.

Ready to optimise your CV? Try CVPilot free and see your ATS score in under 60 seconds.