Convert a spreadsheet of numbers

For lists, not phones

A bank, a clinic or a ministry with a hundred thousand customer numbers cannot run a phone app over them. Drop the file here instead — it is converted by the same rules the app uses, in this browser, and never leaves your computer.

Your file is not uploaded.
It is read in this browser, on this computer. Nothing is sent anywhere — you can watch the network panel while it converts.
Nothing is overwritten.
Every column you already have survives untouched. The results arrive as new columns beside them.
It will not guess.
A number the published plan does not cover is listed for a person to decide, and copied across exactly as it was.

Drop a spreadsheet hereor choose a file — .csv or .xlsxThe file is opened on this computer. It is not uploaded, and this page makes no network request while it works.

What comes back

For each column you convert, three columns are added to the right of everything you already have. Nothing in your file is changed or removed.

Mobile (new)

The number after the change. Where a number could not be converted this holds the original, unchanged — so the column is safe to adopt in full. The worst that can happen to a number this tool could not decide is that it stays exactly as it is today.

Mobile (status)

converted, unchanged or review. Filter on this column to find the rows a person still has to look at, or download them as their own file.

Mobile (reason)

Why, in a sentence, for anything not converted — the same sentence the app shows on a phone.

The plan it was converted against

Every conversion records the version of the numbering plan it used — currently 2026-08-27.1. An Excel file gets it as an extra sheet; a CSV gets it as a separate report you can download beside the data. If the published plan is ever amended, that record is what tells you which of your files need running again.

Excel and phone numbers

Excel treats a column of numbers as a column of quantities: it drops a leading zero, drops the +, and past fifteen digits it rounds. A cell it has already reduced to something like 2.2077E+10 has lost the digits for good, so this tool refuses it rather than converting what is left. Export again from your source system with the column formatted as text, and it will read correctly.

The numbers this tool writes are marked as text so Excel does not do the same thing to them on the way back in. That is what the small green triangle in the corner of those cells means, and it is the correct outcome.

The prefixes come from the published plan. See which two digits each operator gains, or read PURA’s notice in full.