TextFirstCSV CHECK
A small check before a costly import

Your IDs are text.
Excel might disagree.

Check a CSV for leading zeros, long numbers and date-like values before you import it into Excel.

Runs in your browserNo file uploadNo account

ORIGINAL CSV REVIEW BEFORE IMPORT

00123Leading zero
243233597526377476Long identifier
03/04/2026Which date format?

Keep the original value. Choose the right import type.

Check your CSV

UTF-8 · up to 2 MB · 10,000 data records
LOCAL ONLY

Your data stays on this page. Nothing is changed or saved by this tool.

01 / Look first

Spot patterns worth checking

Leading zeros, 16+ digit integers, dates, scientific notation and formula-like text. Flags are suggestions, not an Excel simulation.

02 / Import deliberately

Set identifier columns to Text

Start from your original CSV. Use Excel’s Data → From Text/CSV flow and inspect column types before loading. Steps vary by version.

03 / Keep the original

Lost digits cannot be recovered here

This tool does not repair an already rounded number, edit your file or guarantee that a workbook will import unchanged.

A possible next step

Batch preflight reports · proposed $9 one time

Considering a paid report for checking several CSV files together. It is not released. The free single-file check above works today.

Keep leading zeros in Excel ↗

Why 00123 may become 123, and how to import an identifier as text.

Stop long IDs losing digits ↗

Understand Excel’s precision limit before opening an original CSV.

Independent utility; not affiliated with Microsoft. Free alternatives include Excel’s own import controls and SterileCSV’s local scanner. Privacy & measurement.