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Switching from another app

Switch to us and keep numbering where you left off

Switching takes a few minutes: type in the last invoice number you issued in your current app and we carry on from it. We recognise the common formats: the year before or after the sequence (2026/0143, 0143/2026), a two-digit year (FV26001), the month in the number (202610001), a series code after the year (26500001) and text after the number (2026/014/K). You bring over your customers and issued invoices from CSV. Old numbers stay exactly as they are — nothing is renumbered and you delete nothing in your original program.

Create an accountSee pricing

The account is free. You only pay for documents you send or receive, with no monthly fee and no commitment. A document costs €0.15 and your first 10 are free to try.

How it works

Four steps, three of them copying

  1. 1

    Create an account and fill in your company

    Your Company ID (IČO) is enough — we fill in the name, address and Tax ID (DIČ) from the register. The details are then pre-filled on your invoices automatically.

  2. 2

    Type in your last issued number

    For example 2026/0143. We work out the format and the sequence from it and show you the number we will continue with. If your last invoice was from last year, we start the new year from one. If we guessed the format wrong, you correct it right in the series settings: prefix, year format, month, sequence before or after the year and text after the number.

  3. 3

    Upload your customers

    Export them from your current app to CSV and upload them. Anyone already in your account is not created twice — we only fill in what was missing.

  4. 4

    Upload your past invoices if you want everything in one place

    Also from CSV, with their original numbers. It is not required — the app works just the same without them, you will simply keep the history in your old program.

What changes and what doesn't

Your numbering is yours

Stays the same

  • The invoice number format — prefix, year, separator and number of digits.
  • The sequence: your next invoice follows on from the last one you issued elsewhere.
  • The numbers of invoices already issued; transferred documents keep them.
  • Your current program — you don't cancel anything in it until you are sure.

We take over

  • Issuing the invoice in the EN 16931 structure, not just as a PDF.
  • Delivery to your customer — by email or via the Peppol network.
  • Data reporting to the Financial Administration (Finančná správa), mandatory from 2027.
  • Payment reminders after the due date and matching payments from your bank statement.

Questions about switching

Do I have to renumber my old invoices?
No. Transferred invoices keep their original numbers and new ones follow on from them. The Slovak Accounting Act requires the number series to be continuous and unambiguous — which is exactly what switching preserves.
What file do I need for the transfer?
CSV. Most invoicing programs and Excel can save it: in Excel via File → Save as → CSV. You will find a template with the correct column names right in the app on the import page.
What if I only have my invoices as PDFs?
We don't convert your own issued invoices from PDF back into data — history is transferred from CSV. In that case, keep the old documents in your original program and start with the next number in the series here; it has no effect on how the app works or on your obligations to the Financial Administration (Finančná správa). Invoices your suppliers send you are different: we take in an e-invoice in XML (UBL, ISDOC) in full, and from a PDF we read the text and pre-fill the fields.
Can you do the switch for me?
Yes, as the paid Data migration service. We transfer your contacts and open invoices from your current solution. The price is listed in the pricing under integrations; a typical sole trader doesn't need it, though — you can handle the CSV import yourself.
When does my series reset?
Only at the turn of the year, and only if the year is part of your invoice number. Then the first invoice of the new year gets sequence number 1. If your number has no year in it, the series continues without a break.

Switch smoothly, not from scratch

Create an account, type in your last number and keep invoicing. If anything goes wrong, get in touch — we'll sort out the switch with you.

Start switchingGetting started