Machine Translation Quality: How Good Is It in 2025? (And How to Get Started)

Machine translation isn't what it used to be – and neither is how we evaluate it.

If you're wondering whether machine translation can handle your content needs, you're asking the right question at the right time. The landscape has shifted dramatically with AI entering the translation space, bringing both exciting possibilities and new considerations.

We recently had professional translators take a look at content translated by various machine translation providers, including both traditional neural MT and new AI translation systems. Here's what we discovered:

Machine translation is very good (with most translations only needing light edits), but whether or not you need human review depends on the content you’re translating and the overall scope of your project.

In this guide, we'll answer three key questions:

• What factors determine machine translation quality today?
• How is translation quality actually measured?
• Is machine translation good enough for your specific needs?

Plus, we'll show you exactly how to get started with Weglot, our website translation tool, and begin translating your content in minutes.

Note: Ready to translate your website? Skip the article and start your free trial.

Section 1: What Affects Machine Translation Quality Today‍

First, a quick definition – machine translation is the process of using software to translate content. This content can be anything from website copy to subtitles for videos to user manuals. But here's where it gets interesting – quality isn't a fixed standard.

The Current State of MT Quality

Our study revealed that most machine translations were acceptable – a finding that might surprise those who remember the clunky translations of years past. Today’s tools are not only more accurate, but also significantly faster and much more affordable.

Here's how we tested it: we had professional translators evaluate content translated by various machine translation providers, including:

• Amazon translate
• DeepL
• Google Cloud Translation
• Microsoft Translator
• ModernMT

Translators were tasked with rating how accurate the translations were to the spirit of the text, not just providing a literal translation. This approach matters because modern translation isn't about word-for-word conversion, it's about conveying meaning across cultures.

The editors were asked to rate the translations as:

• Usable – This means they didn’t need to make any changes.
• Touched – The translated content needed minor edits.
• Reworked – The translated content needed significant edits.

We’ll get to the results later, but first let’s look at the factors that affect machine translation quality.

Factors That Determine Translation Quality

Not all translations are created equal. Here's what impacts quality today:

• Language Pair: Some language pairs have better-developed MT systems than others.
• Domain: Well-defined domains yield better results than creative content.
• Text Complexity: Complex sentences and idioms challenge MT systems.
• Context: MT struggles with metaphors and cultural nuances.
• System Type: AI translation excels at context while traditional MT excels at consistency.

The AI Translation Factor

Here's where things get really interesting. Unlike traditional neural MT that relies on pattern matching, LLM-based translation systems understand context at a deeper level. But this power comes with a caveat – hallucination rates between 33-48% with platforms like OpenAI mean AI can sometimes generate plausible-sounding but incorrect translations.

Here’s when to use each type:

• Traditional MT: Best for technical documentation, product descriptions, and content requiring consistency
• AI Translation: Ideal for marketing copy, creative content, and materials requiring cultural adaptation
• Hybrid Approach: Combines the reliability of MT with the contextual understanding of AI

Note: Weglot maintains active API connections with 3 leading translation providers. This way we can always use the best option to translate your site.

For some projects, it can be sufficient just to let machine translation translate your content and not bother with manual reviews (at Weglot, roughly ⅔ of our customers don’t edit their machine-translated content).

Section 2: How Machine Translation Quality Is Measured

Machine translation quality metrics are automated measurements that compare MT output to human translations. Understanding these metrics helps you set realistic expectations and make informed decisions.

Core Quality Metrics Explained

The translation industry uses several key metrics to evaluate quality:

• BLEU measures n-gram precision between machine and reference translations.
• METEOR evaluates translation quality using synonyms and word stems for better linguistic accuracy.
• TER calculates the minimum edits needed to change MT output into a reference translation.
• COMET uses neural networks to predict human quality judgments of translations.

Human Evaluation Methods

Human evaluation remains the gold standard for assessing translation quality, fluency, and cultural appropriateness. Our study emphasized evaluating the "spirit of the text" – a nuanced approach that automated metrics can't fully capture.

The MQM (Multidimensional Quality Metrics) framework provides a structured way to assess translations, but it comes with a cost. For most businesses, the question becomes: when is human evaluation worth the investment?

Quality Estimation Without References

Machine Translation Quality Estimation (MTQE) predicts translation quality without reference translations. This technology is game-changing for real-world applications because:

• It enables real-time quality assessment.
• Reduces the need for expensive reference translations.
• Helps identify content that needs human review.
• Powers smart routing decisions in tools like Weglot.

Understanding Quality Scores

What do these numbers actually mean for your business?

• BLEU scores above 30 indicate understandable translations for most use cases.
• Professional translators typically require 60% or fewer edits for acceptable MT output.
• COMET scores above 0.8 correlate with high user satisfaction.

Quality Results by Provider and Language

When we looked at the average rating across all of these providers we learned that most machine translations were acceptable. FYI: An “acceptable” rating here meant that while some content needed editing, the corrections were mostly light adjustments.

We also learned that different translation providers offer varying levels of accuracy, depending on which language they were translating.

For example, you can see that professional translators made fewer changes to German translations when they were working with Amazon Translate, Microsoft Translate, and Google Translate.

Section 3: Is Machine Translation Good Enough for Your Needs?

Machine translation is 'good enough' when it meets your specific accuracy, fluency, and cost requirements. Let's break this down by use case.

Quality Thresholds by Use Case

Different content types demand different quality levels:

• Ecommerce: Requires high accuracy for product specifications, pricing, and technical details, with machine translation often sufficient for basic product information when combined with human review.
• Technical Documentation: Demands consistent terminology and precise technical accuracy, typically requiring specialized translators and rigorous quality assurance processes.
• Marketing Content: Needs to preserve brand voice and cultural nuance, often requiring transcreation rather than direct translation.
• Legal/Medical: Requires the highest accuracy levels with mandatory human verification, as specified by ISO 20771 (legal) and ISO 13485 (medical devices) standards.

When Human Post-Editing Is Essential

Some situations always call for human expertise:

• Human post-editing is essential when accuracy requirements exceed 95%.
• Legal and medical content requires human review regardless of MT scores.
• Customer-facing content benefits from human review when brand voice is critical.

Remember: For some projects, it can be sufficient just to let machine translation translate your content and not bother with manual reviews.

Making the Decision

Consider these factors when deciding on your translation approach:

Cost of errors vs. cost of editing: A mistranslated product specification might cost thousands in returns, while a slightly awkward blog post translation might have minimal impact.

Volume considerations: High-volume, low-stakes content often justifies pure MT, while low-volume, high-stakes content demands human review.

Time constraints: Urgent projects might accept lower quality for speed, while evergreen content can afford thorough editing.

Section 4: How to Improve Machine Translation Quality

Machine translation enhancement is the process of optimizing source content, tools, and workflows to achieve higher quality automated translations.

Four Pillars of Quality Enhancement

1. Source Text Preparation: Simplify sentences and maintain consistent terminology.
2. Tool Selection: Choose MT engines optimized for your content type and language pairs.
3. Post-Editing Process: Implement human review workflows for critical content.
4. Quality Assurance: Establish feedback loops for continuous improvement.

Introducing AI Language Models (Weglot's Solution)

AI Language Models are custom translation layers that learn from your brand voice and terminology. This innovative approach solves one of the biggest challenges in AI translation – maintaining consistency across your content.

Here's how it works:

• Start with your brand description and tone guidelines.
• Build a custom glossary of your key terms.
• Learn from your past translation edits.
• Apply custom instructions for your specific needs.
• Track enhanced translations with the GenAI tag.

This two-layer process is faster and more affordable than just using human translators, giving you the best of both worlds – AI's contextual understanding with your brand's unique voice.

Section 5: Getting started with Modern Machine Translation

In this section, we look at how you can use Weglot to handle your machine translation.

Quick Setup Process

Weglot has active API connections to these leading translation providers:

• DeepL
• Google Translate
• Microsoft Translate

So by using Weglot, you’re getting machine translation from the best tools in the business, without having to fuss with extracting or uploading your files. You just add Weglot to your website. Weglot works with any website, and here’s a short video showing how simple it is to set it up.

After adding Weglot to your site, you pick which language(s) you want your site translated into. We currently offer over 110 different languages, including right-to-left languages like Arabic and custom languages like Canadian-French.

Weglot will start translating your site immediately thanks to the automatic translation feature. For most sites, this entire process takes just a few minutes. You also have the option of customizing which content gets translated – for example, you can exclude specific URLs from the translation process or even sections/blocks within a page.

Once your translation is done – again, this typically takes a few minutes – Weglot will host your newly translated site under a subdomain/subdirectory of your existing site. For example, one of our customers is SCS Global Services.

Here’s their English site and domain.

Here’s their Arabic site and domain:

Take a look at how seamless the change is from left-to-right orientation to right-to-left orientation. All of that is done by Weglot, simplifying the entire localization process for your website.

By connecting your site with leading translation providers, and allowing you to customize what gets translated and how your language switcher looks, Weglot lets you use highly accurate translation to quickly create a multilingual site.

With Weglot, you can:

• Access all of your translations through your dashboard. You don’t need to download or extract files. You can simply log into your dashboard and pull up your translations, like logging into the back end of a website. However, if you’d rather work outside your dashboard you can also export and import translations.

• You can use a visual editor to make changes to your site from its front end. Sometimes translated content will take up less or more space on your layout. You can use a visual editor to see how translations look within your design and make changes in real time.

• You can order translation services from professional translators. You can also add your own translators, this way, they can work through your machine-translated content and make changes when/if necessary.

If you’re ready to start translating your content, start your free trial today.

Or keep reading to learn how you can access and edit your translations and other key benefits of using Weglot.

Machine translation now rivals human translation in accuracy for many use cases – but plenty of businesses (about ⅓ of our customer base) still choose to make edits to their translations.

These edits could be for accuracy (as discussed, machine translation is very accurate, but not infallible). You may also want to make edits for tone, or to make sure your translated content fits nicely within their website’s layout and overall design.

To customize your translations, start by logging into Weglot to access your translations from your dashboard.

On your dashboard, you can:

• See which languages your site is currently translated into.
• Choose if you want to add any new languages.
• Import/Export your translations.
• Access your Visual Editor.
• Access your glossary. A glossary is just a set of rules for translations. For example, you can exclude certain words and phrases – such as brand names – from being translated.

You can find specific translations by looking up the URL or typing in the phrase or word you want to find.

Or you can use our Visual Editor. When you use our Visual Editor, you see a live version of your site’s front end. You can easily navigate over your website and make edits to your site’s content.

Our Visual Editor is a great way to avoid issues like overlapping text or broken design.

How to Order Professional Translation Services Through Weglot

To execute this, you have two flexible translation options:

Use your own team – Your translators can log into Weglot's platform to access and edit translations directly.

Order professional translations – No translation team? Purchase professional translation services directly through Weglot.

Simply pick which translations you want to be reviewed by a professional translator and pay for your order. Your order will be completed within 2 business days, and your site will be updated with the newest translation.

Note: Because you’re using a base layer of machine-translated content, it’s going to be a faster review process for your translators. This saves you time and money.

Making Machine Translation Work for Your Business

Beyond translation quality, Weglot offers three key benefits that make multilingual websites truly successful:

1. Automatic Content Detection

With Weglot, your translated site exists as a subdomain or subdirectory of your main site. It’s an extension of your main site.

When changes are made on your main site, they will be automatically reflected on your translated site.

For example, if you run an eCommerce store in English and have translated your site into French and German. When you add new products – or revise your product pages – your French and German sites are automatically updated. Any updates and changes you make are then continuously synced, so there’s no worry of displaying untranslated content.

2. SEO Optimization

Weglot’s translation management platform also helps your translated sites with search engine optimization (SEO).

Weglot will automatically:

• Add hreflang tags to your source code that lets Google know about the translated versions of your site
• Translate your on-page SEO content, like metadata and alt tags.
• Create unique URLs for each translated version of your site, creating subdirectories/subdomains for each URL.

3. AI Translation Enhancement

Take advantage of our AI language model’s translation capabilities that go beyond traditional MT. This feature combines the speed of machine translation with the nuance of AI understanding, perfect for businesses that need quality at scale.

4. Smarter ROI for growing websites

Human translation is great quality, but costs $0.04–$0.40 per word and can take days – sometimes weeks – to get back. Machine translation with Weglot is near-instant and costs a fraction of that.

To put it into perspective: translating a 10,000-word site into three languages using traditional methods could set you back $1,200–$12,000, with weeks of waiting. With Weglot, that same site is covered under a monthly subscription, often for less than what you'd pay to translate a single page by hand. And as your site evolves, translations update automatically. No extra costs. No delays.

The New Reality of Translation Quality

Machine translation quality in 2025 isn't about choosing between perfect and terrible – it's about finding the right solution for your specific needs. Traditional MT, AI translation, and AI-enhanced MT each have their place in the modern translation ecosystem.

The key insight? Quality isn't one-size-fits-all anymore. What works for an ecommerce product page might not work for your legal disclaimers, and that's perfectly fine. The flexibility to choose different approaches for different content types is what makes modern translation so powerful.

That’s how Weglot is set up, which makes it a perfect tool for businesses who want to create a multilingual website.

With Weglot you get:

• Fast and accurate neural machine translations from leading providers.
• A translation platform where you can easily access and edit content (as well as order professional translation services).
• Translated sites that always remain up-to-date with any new content changes thanks to Weglot’s automatic content detection and syncing.
• Translated sites that are optimized for search engines.
• Access to Weglot’s AI Language Model for enhanced quality on paid plans.

If you’re interested in seeing how easy website translation can be with Weglot, start your 14 day free trial today. Paid plans include access to AI Language Models for enhanced quality that combines the best of machine translation with AI's contextual understanding.