You wrote the cover letter. The words are right. Now you have to upload it. And you are not sure what the file should look like. One page or two? PDF or Word? What font? Where does it even go in the application?

This article handles the part nobody covers. Not the writing. The actual file. Page count, file type, file size, font, margins, naming, and where to drop it in USAJOBS.

From the hiring side of the desk in my federal chain, I watched the HR specialist open every file. On some applications the cover letter was read first. On others it was read last. The ones that got real time shared a few simple traits. The ones that got skimmed had file problems. They looked sloppy before a word was read.

Not sure you even need one? Start with whether USAJOBS requires a cover letter in 2026. If you do need one, the rules below will keep your file from getting clipped, stripped, or skipped.

How long should a USAJOBS cover letter be?

One page. That is the cap.

Federal HR specialists read dozens of applications per announcement. The cover letter is a quick scan, not a deep read. They open it. They look at your top three or four lines. They decide if they keep reading or move on.

Word count target: 250 to 400 words. That is three to four short paragraphs. Anything longer means you are repeating what your federal resume already says. Anything under 200 words means you are not giving them enough reason to keep reading.

The federal resume is where you prove you have the specialized experience. The cover letter is where you tell them why this role, why this agency, why now. Two different jobs. Do not blur them.

The two-page cover letter is a private-sector instinct that does not work in federal. The selecting official does not want a second page. Cut.

What file format does USAJOBS accept?

USAJOBS accepts a wide list of formats. Here is what the official help docs allow:

• PDF: The recommended format. Preserves your layout exactly.
• DOC and DOCX: Standard Word formats. Accepted, but layout can shift when HR opens them.
• RTF: Rich Text Format. Works, but no reason to use it over PDF.
• TXT: Plain text. Strips all formatting. Not supported in all agency systems. Skip unless an announcement specifically requires it.
• ODT: Open Document Text. Accepted in your USAJOBS document library, but not all agency application systems support it. Use PDF instead.
• JPG, JPEG, GIF, PNG: Image files. Accepted for documents like DD-214 scans, not cover letters.

Use PDF. The reason is simple. A PDF looks the same on every machine. A DOCX you built in Word on a Mac may render differently for the reviewer. It depends on which version of Word or LibreOffice they open it in. Fonts shift. Spacing breaks. Margins move. That looks sloppy.

PDF eliminates all of that. The full breakdown is in our PDF vs Word for USAJOBS guide. Same logic applies to the cover letter.

One exception. If the announcement asks for a Word document, use Word. Some agencies want the raw file so they can copy text into their review system. The announcement will tell you.

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What is the USAJOBS file size limit?

Documents on USAJOBS must be under 5MB each. You can upload up to ten documents per application.

A normal cover letter saved as a PDF should be well under 100KB. If your cover letter file is over 1MB, something is wrong. Usually it is one of these:

• Embedded image of your signature: A scanned signature can balloon a file to several MB. Either skip the handwritten signature or compress the image before embedding.
• Cover letter built in a design tool: Canva and Adobe InDesign export PDFs with embedded fonts and decorative elements. Those bloat the file. Build cover letters in Word or Google Docs.
• Scanned cover letter: If you printed, signed, and scanned the file, you now have an image PDF. HR cannot search or copy text from it. Build a digital cover letter from the start.

USAJOBS also will not accept encrypted or password-protected files. If you applied a password when you saved the PDF, remove it before uploading.

What font and font size should you use?

Pick a standard font. Use 11pt or 12pt for the body. That is the whole rule.

Good choices:

• Arial: Clean, readable, installed on every machine.
• Times New Roman: The federal default. Boring, but every HR system handles it fine.
• Calibri: Word's default since 2007. Modern and readable.
• Garamond: Slightly more refined. Reads well on paper.
• Helvetica: Apple equivalent of Arial. Safe.

Avoid:

• Decorative fonts: Anything that looks like handwriting, calligraphy, or a tech startup logo. The HR specialist is not impressed.
• Tiny fonts (under 10pt): You are trying to fit two pages into one. Cut content instead.
• Oversized fonts (over 12pt): Padding to fill the page. HR notices.
• Custom or downloaded fonts: They may not render on the HR machine. Stick with what comes pre-installed.

The header (your name at the top) can be 14pt to 16pt. Section labels stay 11pt to 12pt. Body text stays 11pt to 12pt. That is the whole hierarchy.

The font rules for cover letters match the rules for federal resumes. We covered the full breakdown in our federal resume formatting guide. Use the same choices for both documents so they look like a matched set.

What about margins, spacing, and headers?

Standard business letter format works fine. Here is what that means:

• Margins: One inch on all four sides. Tighter margins (0.75" or 0.5") are okay if you need the room, but do not go under 0.5".
• Line spacing: Single-spaced for the body. One blank line between paragraphs.
• Alignment: Left-aligned. Do not justify text. Justified text creates uneven word spacing that is hard to read.
• Name and contact block: At the top of the page. Name, city, state, phone, email. No need for a full street address.
• Date: Below the contact block.
• Addressee: Hiring official or HR contact if the announcement provides one. If not, see our cover letter salutation guide for the right call.

Skip the decorative headers and footers. No banners, no colored bars, no logos. A federal cover letter is a business document, not a marketing flyer. The HR specialist wants to find your name and your message fast. Anything else is noise.

Page numbers are not needed on a one-page cover letter.

Where do you upload the cover letter on USAJOBS?

There are two places to handle documents on USAJOBS. Knowing the difference saves you time.

The Documents tab in your USAJOBS profile. This is your document library. Upload your cover letter here first. You can save up to ten documents. They live in your account and can be attached to any application.

The application flow itself. When you apply to a specific announcement, USAJOBS asks you to attach documents. You pick from your Documents tab library, or upload a new file right there.

The smart move is to upload to your Documents tab first. Save a clean, tested copy. Then attach it during the application flow. If the application times out, your cover letter is already saved in your account.

The full step-by-step is in our USAJOBS application walkthrough for veterans.

Naming the file

USAJOBS does not require a specific filename. But HR specialists open hundreds of files with names like "coverletter.pdf" and "final_v3.pdf." Yours should be findable.

Use this format:

LastName_FirstName_CoverLetter_AnnouncementNumber.pdf

Example: Smith_John_CoverLetter_24-FAA-12345.pdf

Why it works. The HR specialist saves your file to a folder of 80 other applicants. Your file sorts cleanly. Your last name. The document type. The announcement it goes with. No guessing. Use the same format with "Resume" for your federal resume so they pair up.

Common upload mistakes

Most cover letter upload problems trace back to one of these:

• File over 5MB: Will not upload. USAJOBS rejects it before the application even sees it. Compress images, strip embedded fonts, or rebuild from a simpler template.
• Password-protected PDF: USAJOBS will not accept encrypted files. Open the PDF, remove the password, save again.
• Image-based PDF: If you scanned a printed cover letter, the file is an image. The HR specialist cannot copy text from it. Some review systems cannot read it at all. Build a digital cover letter from scratch.
• Wrong filename: "Document1.pdf" or "final.pdf" looks lazy. Use the LastName_FirstName_CoverLetter format.
• Cover letter pasted into the resume field: Common mistake. The cover letter goes in its own upload slot, not at the top of your federal resume.
• Wrong cover letter for the announcement: Your letter for a GS-9 Logistics role does not work for a GS-11 Contracts role. Tailor each one. Use a different filename so you do not attach the wrong file.
• Forgot to attach it: If the announcement requires a cover letter and you skip it, your application sinks. Always check the Required Documents section before you submit.

What the HR specialist actually sees when they open your file

Here is the part most applicants never see. When the HR specialist opens your cover letter, they are not reading every word. They are scanning for four things:

1. Did this person tie their experience to the announcement?
2. Did they mention the right specialized experience keywords?
3. Are they writing like an adult, or copying a template?
4. Does the document look professional?

The first three are about the writing. The fourth is about the file. And the fourth happens before the first three.

A cover letter that opens with broken formatting or a sideways image gets less attention than a clean one. Same words. Different result. The selecting official I worked with would set the messy ones aside for later. "Later" sometimes meant never.

None of this is about being fancy. It is about not getting in your own way. A boring, clean, one-page PDF in Times New Roman beats a designed cover letter every time. The federal side is not impressed by design. They are impressed by people who follow basic conventions.

How is this different from cover letter content?

The file specs above are about the document. They will not write the letter for you.

For the writing part:

• How to write a federal cover letter: paragraph structure, what to put in each section, how to tie experience to the announcement.
• Cover letter salutations: when to use a name, when to use a title, when "Dear Hiring Manager" works.
• Federal cover letter format for veterans: opening, body, closing, military-to-civilian translation.
• Military to civilian cover letter template: copy-paste starting point you can adapt.

Read the writing guides for content. Use this article for the file. Together they cover both sides of getting a cover letter into USAJOBS the right way.

The fastest way to get all of this right

You can build your cover letter from scratch in Word. Manage the font and margins yourself. Save as PDF. Name the file. Upload. That works.

You can also let BMR's free cover letter builder handle the file side for you. Two free tailored cover letters come with the free plan. That applies to every veteran, transitioning service member, and military spouse. The builder outputs a clean PDF. Right length, font, and margins. The filename follows the LastName_FirstName format. You paste in the job announcement. The writing ties to the specialized experience in that posting.

Federal hiring is hard enough. The file does not need to be one of the things you are fighting. Get the words on the page. Get the file clean. Get it uploaded. Move on to the next application.

You handled bigger problems in uniform than this. Knock it out.