Find the errors in your spreadsheet without formulas.
Duplicates, empty cells, mistyped emails, dates in three formats. Upload your Excel or CSV and see them flagged row by row in seconds. No code, and the file never leaves your computer.
No card · Nothing to install · Your file never leaves your computer
Before and after.Same file, different afternoon.
Without Blockema
- You scroll through 2,000 rows and check the ones you have time for.
- Excel's validation only looks at one cell: it can't see the same value repeated 1,800 rows up.
- Every month whoever is free checks it, each in their own way.
With Blockema
- Checks the whole file, not cell by cell.
- Catches duplicates and rules that depend on another column.
- The same rules every month, whoever opens it.
- Hands you the corrected file, not a report.
Set it up once.Check every file in seconds.
From your spreadsheet to an error-free file in three steps. No formulas, no IT.
Your files never leave your computer
You choose where each file is checked.
On your computer
Default
It's checked right in your browser tab. The file isn't uploaded anywhere.
On our server
If you prefer
Close the tab and see the result later, from any device. Servers in the EU (Germany).
Nothing to install or integrate.
For the files that can't go wrong.
Invoices, contact lists, catalogues and orders. Pick the one you deal with and watch what gets caught before it reaches its destination.
Before you pay them, send them to your accountant or import them into your books. A repeated invoice is a double payment, and a mistyped IBAN is a bounced direct debit.
What its rules check
- invoice_no never repeats: no paying twice
- supplier is never empty
- total is greater than 0
- iban is a valid IBAN
One plan.No surprises.
Try it with your own files first. Pay only once you're sure it's worth it.
€19/month
Less than one hour spent checking files.
30 days free, no card required, then €19/month.
- Unlimited files and checks, no per-check fees
- Check locally or on the server
- Save your rules and reuse them on every file
- Cancel anytime, no lock-in
What people usually ask us
Do I need to know formulas or how to code?
No. Rules are built by dragging blocks, and if you upload a file, Blockema proposes them for you.
Can't I just do this in Excel?
Partly, if you know formulas and have time to set them up. But Excel's validation only warns you as you type in a cell: it doesn't check what you paste or compare rows with each other. With Blockema you check the whole file, jump straight to each error and download your file fixed. No formulas.
Can't I just do this with AI?
You can ask a chatbot to check your file, but it may answer differently every time, sometimes skips rows or makes up errors that aren't there, and your file ends up on another company's servers. Blockema always applies the same rules to every row: the same file always gives the same result, and each error points to the row and the rule that caught it. And if you prefer, you check it locally, in your tab, without it ever leaving your computer.
Are my files uploaded anywhere?
Only if you choose to. When you check a file you pick between running it locally, in your tab, so it never leaves your computer and the result is saved only on that device, or on our server in the EU (Nuremberg, Germany), so the run is in your history on any device.
Which file types does it accept?
Excel (.xlsx, .xlsm and .xls), OpenDocument (.ods), CSV and TSV (.tsv and .tab), up to 100 MB per file. Corrected files are saved as .xlsx, .csv or .tsv: an .xls or an .ods can be opened and checked, but a corrected copy cannot be written back into it.
Does it break my Excel formatting?
No. Your fixes are applied on top of the original file, with its formatting and its formulas.
What happens when the trial ends?
If you want to carry on, it's €19/month. We don't ask for a card to start, so nothing is charged to you automatically.
Can I cancel whenever I want?
Yes, no lock-in. You cancel from your account and keep access until the end of the period you already paid for.
Still have questions? Write to us
Your next file is about to land.Better know what's in it.
No sign-up, nothing uploaded. Already convinced? Create your free account