My form has required fields that this tool says are empty even though I filled them.

Likely the form is using a non-standard required indicator (validation script, label colour, etc.). This tool only honours the standard /Ff bit. If your form designer used JavaScript validation or visual cues, those won't be detected.

Validate Required Form Fields

Check whether every required field in a PDF form has been filled. Pass/fail report with the names of any missing fields.

Your files never leave your browser. All processing happens on your device — nothing is uploaded.

1. Upload your file

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How does the Validate Required Form Fields work?

Check that every form field marked as "required" in a PDF has a value. Required is determined from the field's flag bit (the AcroForm /Ff bit 2, set by the form author when designing the template). The output is a pass/fail report listing any required fields left blank, with their page numbers and types so reviewers can find them quickly. Useful for receivers wanting to bounce back incomplete submissions before processing them.

🔒 Security & Privacy

All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.

📱 Use it on any device

Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

🎁 Always free, no signup

Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.

Frequently asked

It checks the AcroForm /Ff Required flag (bit 2) on each field. If the form author marked the field required when designing the form, this tool will check it. Fields not marked required are not checked, even if they look obligatory.