why pdf resumes sometimes fail in online submissions

When you upload a polished PDF to an employer’s portal, you expect the document to look exactly the same as on your screen. Unfortunately, many PDF resumes sometimes fail in online submissions because applicant tracking systems (ATS) struggle to read them. In this guide we’ll unpack the technical reasons behind those failures, show you how to test and fix your PDF, and provide actionable checklists so your resume passes every automated gate.

Understanding ATS and PDF Parsing

ATS (Applicant Tracking System) is software that scans, parses, and stores candidate information. Recruiters rely on it to filter thousands of applications quickly. Most ATS are built to read plain text or simple Word documents. When a PDF is uploaded, the system must first extract the text layer. If the PDF is created in a way that hides or distorts that layer, the ATS either skips the resume or records garbled data.

Key point: A PDF that looks perfect to a human can be invisible to an ATS.

Why does this happen?

1. Embedded fonts or graphics that the parser cannot decode.
2. Password‑protected or encrypted PDFs that block text extraction.
3. Complex layouts (tables, columns, text boxes) that split the logical reading order.
4. Image‑only PDFs where the entire resume is a scanned picture.
5. Excessive file size that exceeds the portal’s limit, causing a timeout.

Understanding these pitfalls is the first step toward an ATS‑friendly PDF.

Common Reasons PDF Resumes Fail in Online Submissions

1. File Size & Compression

Large PDFs (often >2 MB) can trigger upload errors or cause the ATS to truncate the file. High‑resolution images, embedded logos, and unnecessary metadata inflate size.

Solution: Optimize images to 72 dpi, remove unused pages, and use the "Save As Optimized PDF" option in Adobe Acrobat or a free online compressor.

2. Unsupported Fonts & Graphics

Custom fonts (e.g., handwritten or decorative typefaces) may not embed correctly, leaving the ATS with missing glyphs.

Solution: Stick to web‑safe fonts like Arial, Calibri, or Helvetica. When you must use a unique font, embed it during export.

3. Security Settings & Password Protection

Some resume‑building tools automatically add a password or restrict copying. The ATS cannot bypass these restrictions, resulting in a blank or partially read file.

Solution: Ensure the PDF is unlocked and allows text copying before uploading.

4. Complex Layouts & Tables

Two‑column designs, nested tables, and text boxes look modern but confuse parsers. The reading order may become scrambled, causing the ATS to misplace dates, job titles, or skills.

Solution: Use a single‑column, left‑aligned layout. If you need sections, separate them with clear headings rather than tables.

5. Missing Text Layer (Image‑Only PDFs)

Scanning a printed resume creates an image‑only PDF. Without OCR (optical character recognition), the ATS sees no text.

Solution: Export directly from a word processor or use an OCR tool to add a searchable text layer.

Step‑by‑Step Guide to Create an ATS‑Friendly PDF

1. Draft your resume in a plain‑text friendly editor (Google Docs, Microsoft Word, or the Resumly AI resume builder). The builder automatically formats content for readability.
2. Choose a simple, single‑column template. Avoid decorative borders and background images.
3. Select a standard font (Arial, Calibri, Times New Roman) and set the size to 10‑12 pt.
4. Insert keywords naturally. Use the Job search keywords tool to discover the exact terms recruiters search for.
5. Export as PDF using the "Standard (PDF/A)" setting. This creates a universally readable file.
6. **Run the ATS resume checker. The tool highlights parsing errors, missing sections, and oversized files.
7. Fix any flagged issues (e.g., replace a problematic icon, reduce image size, adjust heading hierarchy).
8. Re‑run the checker until you receive a green pass.
9. Upload the final PDF to the job portal. If the site offers a preview, verify that the formatting remains intact.

Pro tip: Keep a Word version of your resume handy. If a portal rejects PDFs, you can quickly upload the .docx instead.

PDF Resume Submission Checklist

• File size under 2 MB.
• Uses standard fonts (Arial, Calibri, Helvetica, Times New Roman).
• No password protection or encryption.
• Single‑column layout with clear headings.
• All text is selectable (not an image).
• No embedded tables for main content.
• Keywords aligned with the job description (use Resumly’s career guide for research).
• Passed the ATS resume checker with a green score.
• File name follows the format FirstName_LastName_Position.pdf.

Do’s and Don’ts

Real‑World Case Study: Sarah’s Turnaround

Background: Sarah, a marketing coordinator, applied to 30 jobs using a stylish two‑column PDF created in Canva. She received only two interview invitations.

Problem: The ATS for most companies could not parse the columns, resulting in missing dates and skill tags.

Action: Sarah switched to the Resumly AI resume builder, chose a single‑column template, and ran the ATS resume checker. The tool flagged a large logo image (1.8 MB) and an embedded font.

Result: After optimizing the logo and using standard fonts, Sarah’s PDF size dropped to 0.9 MB. She re‑uploaded to the same portals and saw a 250 % increase in interview callbacks within two weeks.

Frequently Asked Questions

1. Can I still use a PDF if the job posting specifically asks for a Word document? Yes, but it’s safer to follow the employer’s exact request. Some ATS treat PDFs as attachments and still parse them, but a .docx guarantees compatibility.

2. Do all ATS struggle with PDFs, or are some better? Modern ATS like Greenhouse and Lever have improved PDF parsing, yet many still favor plain text. Testing with an ATS resume checker gives you a realistic view of how most systems will handle your file.

3. How can I tell if my PDF is image‑only? Open the PDF, try to select text with your cursor. If you can’t highlight words, it’s an image‑only file.

4. Should I include hyperlinks in my PDF resume? Hyperlinks are fine for human readers, but some ATS strip them out. Keep the URL text visible (e.g., linkedin.com/in/yourname) so the information isn’t lost.

5. What about PDF/A vs. regular PDF? PDF/A is an archival format that embeds fonts and removes unnecessary metadata, making it more ATS‑friendly. Choose PDF/A when exporting.

6. Is it worth using a resume‑roasting service before finalizing? Absolutely. The Resumly resume roast provides human feedback on content and formatting, complementing the technical ATS check.

7. How often should I update my PDF resume? Whenever you acquire a new skill, certification, or role. Regular updates also let you re‑run the ATS checker to catch any new formatting issues.

8. Can the Chrome extension help with PDF uploads? The extension streamlines job applications by auto‑filling forms and attaching your pre‑tested PDF directly from your browser.

Mini‑Conclusion: Why PDF Resumes Sometimes Fail in Online Submissions

The main culprits are hidden technical barriers—file size, fonts, security settings, and complex layouts—that prevent ATS from reading your content. By simplifying design, using standard fonts, keeping the file lightweight, and validating with an ATS checker, you eliminate the most common failure points.

Take Action Today

1. Build or revamp your resume with the Resumly AI resume builder.
2. Run the ATS resume checker and fix any alerts.
3. Export as a PDF/A, keep the file under 2 MB, and double‑check that all text is selectable.
4. Use the Job search feature to find openings that match your updated, ATS‑ready resume.

By following this roadmap, you’ll ensure that why pdf resumes sometimes fail in online submissions becomes a thing of the past, and your application lands exactly where recruiters expect it.