With the advent of the internet more and more companies are expanding to multiple countries and so the need for English to Chinese or French to Spanish and such kind of translations is ever increasing.
If you are thinking of expanding to other countries you will probably need a good translation agency's services to translate business plans, websites, technical reports, legal papers, etc. You can also get online translation services to form the best translation agency.
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Doing business globally always leads to a language problem. Hiring a good translation service will go a long way in overcoming this.
Research About the Agency
Check out the agency's website. See if you can get hold of their case studies and/or contact their previous clients. Apart from doing online research see if your colleagues, business associates, and family have anything to recommend.
Check for Different Language Combinations
The more, the language translation options offered, the better. For example, check if the agency you are considering offers English to Chinese translation. If such a basic option is unavailable you definitely want to look elsewhere. However, more options can be achieved by employing few people to do more types so, be sure to look into the team member's credentials also.
Cheap is Not Always Good
Cheap agencies will definitely help you reign your budget but they will not necessarily produce top quality translation (not even for basics like English to Chinese translation). So, be careful if you are looking to translate important legal documents. You might end up paying quite heavily if your translation agency ends up making a mistake or is corruptible.