"Bad Parameter" when trying to redact multiple files at once.

Here’s the revised draft without checkmarks:

Troubleshooting Checklist for Batch Redaction in Acrobat

If you’re seeing a “bad parameter” error when loading an entire folder for redaction, try these steps:

1. Verify Folder Contents

• Ensure all files are PDFs (no hidden non-PDF files).
• Remove files with unusual characters in names (e.g., #, %, &).
• Check that none of the PDFs are password-protected or digitally signed.

2. Move Files to Local Storage

• Copy the folder to a local drive (avoid network or cloud paths).
• Ensure you have full read/write permissions.

3. Test Smaller Batches

• Split the folder into smaller groups (e.g., 10–20 files).
• Run the redaction on each batch to identify problematic files.

4. Preflight and Optimise PDFs

• In Acrobat, go to Tools > Print Production > Preflight.
• Run a basic PDF validation and fix any structural issues.
• Alternatively, use PDF Optimizer to clean up metadata and embedded content.

5. Update Acrobat

• Make sure you’re on the latest version of Acrobat.
• Older builds had known issues with batch redaction workflows.

Recommended Workflow for Reliable Batch Redaction

1. Open Acrobat and select the Redact Tool.
2. Choose Add Files instead of loading the entire folder at once.
3. Add files in manageable batches.
4. Apply your redaction settings and run the process.
5. Save the output to a new folder to avoid overwriting originals.

Important Note: The batch redaction feature is sensitive to file integrity. If one file fails validation, the entire operation can throw an error. Following the above steps may help you isolate issues and ensure a smooth process.

Best regards,
Tariq | Adobe Community Team