Is Sigmera a replacement for Excel?

No, and it is not trying to be. Excel is a spreadsheet and analysis environment with formulas, pivot tables, and charting. Sigmera does one narrow part of that surface — cleaning and reshaping a data file — and does it in fewer steps. Most people who use both clean the file in Sigmera and then open the result in Excel.

Why does Excel break my phone numbers and ZIP codes?

Excel treats a column of digits as numeric. Microsoft's documentation states that it automatically removes leading zeros and converts large numbers to scientific notation so that formulas work on them, and that numbers beyond 15 digits are rounded. The same page warns that formatting the cells as text later will not restore leading zeros already removed, so the loss happens the moment the CSV is opened.

How many rows can Excel handle?

A worksheet is capped at 1,048,576 rows by 16,384 columns. That is a fixed limit of the file format, not of your hardware. Sigmera has no equivalent grid ceiling — how large a file it handles depends on the memory available to your browser.

Is Excel's Remove Duplicates reliable?

It works, with two caveats worth knowing. Microsoft notes that it permanently deletes the duplicate values rather than hiding them, so run it on a copy. And it compares what appears in the cell rather than the underlying stored value, which means the same date formatted two different ways is treated as two distinct records.

How much does Excel cost?

Microsoft 365 Personal is $99.99 a year or $9.99 a month, and Microsoft 365 Family is $129.99 a year for up to six people. Office Home 2024 is a $179.99 one-time purchase covering one PC or Mac. Excel for the web is free but requires a Microsoft account, and files are stored in OneDrive. Prices verified July 2026.

Does Sigmera upload my file the way an online converter does?

No. The file is read and transformed by JavaScript running in your browser tab, so it is never transmitted to a server. Desktop Excel is local in the same sense; the meaningful contrast is with Excel for the web and with online CSV converters, both of which put your file on someone else's infrastructure.

Sigmera vs Microsoft Excel

Microsoft Excel is the default spreadsheet application and, for most people, the default data-cleaning tool as well — not because it was designed for the job but because it is already installed. It brings a genuine cleaning toolkit: Remove Duplicates, the Text to Columns wizard, Flash Fill, and Power Query for repeatable transform pipelines. It is also a full analysis environment with formulas, pivot tables, charting, and VBA, which no single-purpose tool matches. The desktop app costs $99.99 a year as part of Microsoft 365 Personal or $179.99 as a one-time Office Home 2024 purchase; Excel for the web is free but requires a Microsoft account and keeps your files in OneDrive.

Feature	Sigmera	Microsoft Excel
Row and column limit	Bounded by your device's available memory	1,048,576 rows by 16,384 columns
Cost to start	Free tier, no card	Free on the web with an account; $99.99/yr or $179.99 once for desktop
Install required	No	Desktop yes, web no
Account needed to try	No	Yes
Where the file sits while you work	In the browser tab, on your device	Desktop: on your disk. Web: in OneDrive
Deduplication	Purpose-built, preview before removing	Remove Duplicates — permanent deletion
Splitting and joining columns	Dedicated split and join transforms	Text to Columns wizard, Flash Fill, formulas
Repeatable transform pipelines	No	Power Query
Long IDs and phone numbers	Read and preserved as text	15-digit precision; scientific notation
Formulas, pivot tables, charts, macros	No	Yes
Works offline	Yes, once the page has loaded	Desktop yes, web no
Cell content limit	No fixed per-cell cap	32,767 characters

Where Sigmera wins

Nothing to install, no account to try it
Sigmera opens in a browser tab and works immediately. Excel's free web tier requires a Microsoft account before you can open a file at all, and the desktop app requires a licence and an install. If you are on a borrowed machine, a locked-down work laptop, or someone else's computer, that difference decides whether the job gets done today.
The file is never uploaded
Sigmera parses the CSV with JavaScript inside your own browser, so no bytes are transmitted. Desktop Excel is also local, so this is not a differentiator there — but against Excel for the web, where files live in OneDrive, and against the online CSV converters people reach for instead, it is the substantive difference. It matters most when the columns hold names, emails, and phone numbers.
Long IDs and leading zeros survive
Excel treats a column of digits as a number. Microsoft documents that it removes leading zeros and converts large numbers to scientific notation on open, and that formatting the cell as text afterwards will not restore the zeros already lost. Sigmera reads CSV columns as text from the start, so ZIP codes, order numbers, and international phone numbers arrive intact rather than needing a repair pass.
Cleaning steps that are one step
Standardising a phone column in Excel means a formula, a fill, a Paste Values pass, and deleting the source column. In a purpose-built tool it is one operation producing static output. The saving is small on one column and compounds across a file with six of them, which is where most of the rework in a pre-import cleanup actually lives.
No row ceiling to run into
Excel stops at 1,048,576 rows — an export larger than that silently truncates or refuses to open. Sigmera's limit is whatever memory your device has, so a two-million-row export is a question of hardware rather than a hard wall.

Where Microsoft Excel wins

Power Query is a genuinely better answer for recurring work
If you clean the same export every week, Power Query records the transform steps once and re-runs them against the new file. Sigmera has no equivalent — each run is a fresh pass. For a repeating pipeline, Excel is the right tool and we would rather say so than pretend otherwise. The caveat is platform coverage: Power Query is absent from Excel 2016 and 2019 for Mac.
It is an analysis environment, not just a cleaner
Formulas, pivot tables, charting, and VBA make Excel a place to answer questions about data, not only tidy it. Sigmera does none of this. If cleaning is the first step of an analysis that continues in the same file, staying in Excel avoids a pointless round trip.
For a one-off dedupe, it is already open
If the file is in Excel and you need to drop duplicate rows once, Remove Duplicates is two clicks away and costs nothing extra. Reaching for another tool would be overhead. The reasons to leave Excel are volume, repeatability, columns it mangles, and files you would rather not hand to a cloud service — not deduplication as such.
Offline desktop app and ecosystem depth
The desktop application runs with no connection at all, integrates with the rest of the Microsoft estate, and opens formats and edge cases accumulated over decades. It is the format everyone else expects to receive, and that interoperability has real value.

Choose Sigmera if…

Cleaning a contact export that holds personal data you would rather not put in a cloud service
Files with ZIP codes, order IDs, or international phone numbers that Excel rewrites on open
Exports larger than Excel's million-row grid
Working on a machine where you cannot install software or sign in to a Microsoft account
A one-pass cleanup where the file's destination is a CRM importer, not further analysis

Choose Microsoft Excel if…

A cleaning routine you repeat on a schedule, where Power Query pays for itself
Work that continues into formulas, pivot tables, or charts in the same file
A single dedupe on a workbook that is already open
Teams standardised on Microsoft 365 with shared workbooks in OneDrive
Anything needing macros or VBA automation

Sources

Frequently asked questions

Is Sigmera a replacement for Excel?: No, and it is not trying to be. Excel is a spreadsheet and analysis environment with formulas, pivot tables, and charting. Sigmera does one narrow part of that surface — cleaning and reshaping a data file — and does it in fewer steps. Most people who use both clean the file in Sigmera and then open the result in Excel.
Why does Excel break my phone numbers and ZIP codes?: Excel treats a column of digits as numeric. Microsoft's documentation states that it automatically removes leading zeros and converts large numbers to scientific notation so that formulas work on them, and that numbers beyond 15 digits are rounded. The same page warns that formatting the cells as text later will not restore leading zeros already removed, so the loss happens the moment the CSV is opened.
How many rows can Excel handle?: A worksheet is capped at 1,048,576 rows by 16,384 columns. That is a fixed limit of the file format, not of your hardware. Sigmera has no equivalent grid ceiling — how large a file it handles depends on the memory available to your browser.
Is Excel's Remove Duplicates reliable?: It works, with two caveats worth knowing. Microsoft notes that it permanently deletes the duplicate values rather than hiding them, so run it on a copy. And it compares what appears in the cell rather than the underlying stored value, which means the same date formatted two different ways is treated as two distinct records.
How much does Excel cost?: Microsoft 365 Personal is $99.99 a year or $9.99 a month, and Microsoft 365 Family is $129.99 a year for up to six people. Office Home 2024 is a $179.99 one-time purchase covering one PC or Mac. Excel for the web is free but requires a Microsoft account, and files are stored in OneDrive. Prices verified July 2026.
Does Sigmera upload my file the way an online converter does?: No. The file is read and transformed by JavaScript running in your browser tab, so it is never transmitted to a server. Desktop Excel is local in the same sense; the meaningful contrast is with Excel for the web and with online CSV converters, both of which put your file on someone else's infrastructure.