Import preview — nullvuild

An import preview is the review screen a user sees after uploading a file but before the product writes data into the account.

The preview should answer three questions: what will be created, what will be changed, and what will be rejected. For a small SaaS team, this screen is often more valuable than another help article because it catches mistakes before support has to unwind them. A preview can show row counts, matched columns, duplicate records, missing required fields, date format problems, and sample rows from each error group.

The boundary is that a preview is not a full spreadsheet editor. It should not invite the user to clean every row inside the product unless that is the product promise. Its job is to make the import decision safe: continue, fix the file, download an error report, or cancel.

A practical import preview needs plain labels. "12 rows skipped because email is missing" is better than a generic validation failure. The screen should also make rollback expectations clear. If the import cannot be undone, the confirmation step should say so before the user clicks the final button.

Small teams should add an import preview before they add bulk undo, manual database fixes, or support-only cleanup tools. It lowers risk at the point where the customer still has control over the file.

Import preview small saas 2026

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