5 Practical Tips on How to Improve Machine Translation Quality

5 Practical Tips on How to Improve Machine Translation Quality

Since Google introduced neural machine translation in 2016, machine translation quality has vastly improved. But this still hasn’t soothed the trauma caused by early experiences with statistical machine translation. Despite its ability to deliver translations quicker and at a lower cost, many still want to know how to improve machine translation quality before they implement it.

We understand. Companies often require high-quality and precise translations to protect their brand image and prevent usage issues. Furthermore, based on our experience, machine translation alone is not always the best solution for translating complex documents such as user manuals, software documentation, or UI strings. 

Popular free machine translation services like DeepL or Google Translate have proven their worth in allowing people to get the gist of a text. However, they typically fall short in their inability to fully grasp context and incorporate company terminology.  

Example of a bad translation of a warning on a technical product, showing the need to improve machine translation quality


The good news is that there are ways around this! But just how can you improve machine translation quality to achieve maximum productivity for your translation and localization processes? We’ve summarized the most important aspects of a successful approach to enterprise machine translation below. 


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1. Identify the Right Technology Provider

Today’s enterprise machine translation systems are most often offered as cloud subscription services. The most popular machine translation software includes: 

  1. Google Translate 
  2. DeepL 
  3. Microsoft Translator 
  4. Systran Translate 
  5. Amazon Translate 


Furthermore, regional service providers like Russia’s Yandex and China’s Baidu specialize in translations to and from their respective languages. All these companies offer an optional fee-based service that safeguards business data for corporate customers, as well as a REST API for easy integration with internal software. 

Generally, you cannot go wrong with the service providers listed above – the differences in quality are minimal, and their pricing is comparable. Instead, one way to differentiate vendors is by analyzing the additional technologies they employ and integrate into their systems.  

For example, Google’s market leader position in deep learning and artificial intelligence means it provides the most reliable results across all languages (even the less popular ones). On the other hand, DeepL relies on Linguee’s high-quality translation database and produces more fluent texts thanks to the specific configuration of its deep neural network architecture, which is based on the Transformer model.


2. Test Machine Translation Outputs 

Whatever you do, don’t blindly trust a machine translation service provider’s claim that it produces “near-human translation quality”. While it may provide an understandable output in your target language, you will still need to determine whether it is the right quality for your company’s needs.  

Different machine translation software have different output quality for different languages. This is only natural seeing that outputs are dependent on the languages their systems have been trained with.  

This is why it is critical to test the output yourself – and by that, we don’t mean just throwing a few sentences into Google Translate or DeepL. Instead, here are 3 steps you can take to verify the quality of a machine translation’s output. 

3 simple steps to verify machine translation quality: 

  1. Take a sample text of between 500 and 1,000 words that’s representative of the text type and the subject area you want to translate
  2. Let the machine translate the text  
  3. Get internal experts like technical writers or professional translators to scrutinize the output quality, and give their feedback 


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3. Ensure Proper File Processing 

In many instances, the content you need to translate will not be available in a text format that can be conveniently transferred into a machine translation tool. 

File and document formats such as website content, UI strings, XML or PowerPoint, can have a significant impact on machine translation output quality. Common challenges this can pose for translation outputs include: 

  • Incorrect line break inputs cause translations to restart in the middle of a sentence, leading to misinterpretations
  • Additional spaces added before special characters (. , ? !)  
  • The document’s formatting is scrambled  
  • The mark-up language in the source code of the document is erroneous  
  • Important terms – such as your company’s name or key products – are translated incorrectly 


Inconsistencies of this nature result in higher translation costs, as further corrections must be carried out during the post-editing step. To prevent this, well-engineered procedures are crucial when it comes to pre- and post-processing translation files 


4. Machine Translation Post-Editing With CAT Tools 

Despite advancements in neural machine translation, outputs can still lack fluency and can be prone to errors. For businesses, this may make it difficult for end users to comprehend, or in a worst-case scenario, they may be misled by poorly translated documents.  

To guarantee the best possible machine translation quality, outputs should be revised by an experienced editor. This person should not only be familiar with the subject area and the source language, but should also be trained to spot typical error types in machine translation outputs. 

“Post-editing” is usually carried out in CAT tools, which now all feature plugins for selected and customized machine translation systems… more on that in the final point.  


5. Customize Your Machine Translation Engine

Free machine translation software translates everything from recipes to poems and your technical documentation using the same resources. Thus, it is no surprise why the precision of your corporate language is lost when your texts are reproduced using standard machine translation.

For this reason, enterprise-level machine translation systems must be trained for their specific purpose to achieve maximum efficiency. Users can incorporate corporate language and terminology into translations, resulting in more accurate and precise translations by utilizing computer-aided translation (CAT) tools that leverage features such as translation memory, termbases, or glossaries.  

To further enhance machine translation quality, a growing number of companies are developing adaptive machine translation. This is an engine that updates its database in real-time as a human post-editor is giving feedback to a translation, allowing for higher efficiency and accuracy in the translation workflow. 


Improve Machine Translation Quality With Milengo 

With such a wide choice of machine translation services conveniently available, it’s possible to get an understanding of information and documents in languages you don’t speak quickly and efficiently. However, as a business, it’s important to distinguish how fluent translations of your various types of content need to be to ensure your brand image and user experiences remain optimal. 

Milengo strips away the complexities of building a machine translation workflow and helps you build a customized solution fit for your needs. Depending on your content and budget, we provide flexible options with varying levels of machine translation post-editing to match your desired quality.  

Furthermore, our engineers will ensure your translation processes work hand-in-hand with your existing publishing software for the best possible quality and maximum productivity. Get a free consultation with our localization experts today to find out how you can improve your machine translation quality. 


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Sophia Guan

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After 11 years in 9-5 roles, Sophia ditched routine to embrace a digital nomad life. With a diverse background in global communications, a strong cultural curiosity, and a passion for bridging cultures and people, she fosters meaningful connections through effective, creative, and unique cross-cultural communication.