ADOC, ASiC-E and PDF
How to merge several PDFs or DOCX files into one PDF and sign it
When a contract, its annexes and a few scanned pages have to become one signable file, use the Tvarka PDF merge wizard.
What the PDF wizard does
The merge wizard takes several files, prepares them as PDF pages, arranges them in the order you choose, and produces one final document.
That is convenient when what has to be signed is not a set of separate annexes but a single clear contract file.
- Upload the main document and its annexes.
- Put them in the right order.
- Wait for the background conversion.
- Sign the final PDF with a qualified electronic signature (QES), or download it.
Limits, and when to use something else
The public description of the tool states that a single file may be up to 50 MB, and that one merge job is limited to 150 MB.
If the set of documents has to be submitted as a formal container, ADOC or ASiC-E is worth considering instead of a plain PDF.
Frequently asked questions
Can DOCX and PDF be merged together?
Yes. Text documents are converted to PDF before merging.
Does merging cost anything?
The wizard exists to prepare a document. Under Tvarka pricing you pay only for successful chargeable qualified signing actions.
When is ADOC the better choice?
When the recipient explicitly asks for ADOC, or the document goes to a Lithuanian institution that uses the ADOC format.
Sources
- Tvarka PDF merge tool page Checked: 2026-06-12
- Tvarka Sign pricing Checked: 2026-06-12
- Tvarka Sign: public product page Checked: 2026-06-12