File name preview in batch renaming allows you to see the exact new names your files will receive before actually committing the change. This differs from immediate renaming as it acts as a safety net; instead of applying new names instantly when a rule is set, the software displays a simulated list showing the old names alongside the proposed new names. You can review this list to verify accuracy without making any permanent alterations to your files yet.

For example, a photographer using Adobe Lightroom might configure renaming rules for a set of RAW images (e.g., adding a shoot date prefix and sequence number) and use the preview to ensure the order and naming pattern are correct before proceeding. Similarly, a researcher preparing dataset files in bulk using a tool like Bulk Rename Utility would preview the results to confirm variables like patient IDs or timestamps are inserted accurately across hundreds of files.

This preview function is crucial because it significantly reduces the risk of accidental, incorrect renames which could be difficult or impossible to reverse automatically, thus preventing data loss or confusion. However, the effectiveness depends on the preview implementation; some tools might only show a limited sample or struggle with very complex renaming rules. By offering this safety check, preview features encourage confident adoption of batch renaming and promote efficiency without sacrificing control.