Can I apply for a DTV visa in Thailand without a work contract as a freelancer?

No problem.. show extraction from chamber of commerce you are the owner of your company + bankstatements to show you have money coming in ( not from Thailand )

Copies of actual invoices to clients and put your tax return in as well.

I suppose you’re paying taxes somewhere ? Your tax returns can be used as evidence.

You can create your professional portfolio around 15-20 pages including your best work and project. And write requesting cover letter why you want to come to Thailand

Write a letter that explains why you want the visa and how you meet the qualifications. You need to convince the Consulate reviewing your application why they should approve it. Include samples of your work, emails with clients, proof of payments etc.

Yes, a cover letter where you explain your work and the situation and a collection of your translations from some websites. Also if you have some invoices would be helpful. And if you have a website or a business profile e.g. on LinkedIn or XING, you should also include the link inside the letter. All collect in a multiple page PDF to upload as your portfolio.

I’m a freelance graphic designer with no customer contracts. I showed my portfolio of work and also a cover letter to explain the situation. They ask my for a business registration that I don’t have. Bcs as a freelance Media Designer (Sole Proprietorship) I’m not required under

German law to register a business or apply for a business license. Registration with the tax office is sufficient for carrying out my professional activities. So I provided my tax ID number. But I also had to provide all income tax evidence from the last 2 years. After all that my DTV was approved.

You can create a basic contract with your clients to detail they employ you, the services you offer and the duration of your work together.

Depending what embassy you are applying from, it may be okay to get letters signed by clients explaining the work you do for them and for how long you've been doing it, with their contact information. Also, bank statements dating back six months or so with regular payments from said clients to back it up. I did that in Canada and it worked fine as part of my evidence. I did also have evidence of my company name on my tax forms, and a bit more as well.

You don’t have samples of what your translated ?

You answered your own question no contract no DTV