Many AI tools list dozens of supported languages, but quality can differ a great deal between them. If you work in a language other than English, or in several, a few checks save time and avoid embarrassing mistakes.

Treat language claims as a starting point

A language list tells you the tool accepts input in that language. It does not tell you how natural the output sounds, whether it handles regional variants or whether it understands your field. Look for notes on which features work in which languages, because a tool may transcribe well in one language and write poorly in the same one.

Test with your own text

Use a realistic sample: a paragraph from your own work, with names, numbers, idioms and technical terms. For Translation, translate something you can judge yourself, then translate the result back and compare. For writing tools, ask for the same brief in your language and in English and see how much more editing the first needs.

Watch characters and direction

Check that accents, diacritics and non-Latin scripts survive input and export without corruption. For right-to-left languages such as Arabic or Hebrew, confirm that punctuation, numbers and mixed-language sentences appear in the right order, and that exported files keep the direction. Fonts matter too, especially in design and video tools.

Consider formality and local conventions

Languages differ in politeness levels, date and number formats, and spelling variants. Check whether you can set tone, formality or a regional standard, and whether a glossary can fix preferred terms. A glossary is particularly useful for product names and legal terms.

Voice and audio

For transcription and synthetic voices, test accents and dialects you actually encounter. Recognition of names and mixed-language speech is often a weak point. Our overview of Writing & Content explains criteria that also apply to multilingual text work.

Data handling across borders

If you upload documents, learn where they are processed and stored, and whether the provider offers terms that match local privacy rules. Avoid sending personal or confidential material until you understand the policy.

Keep a human reviewer

Even strong output can contain subtle errors in meaning or tone. For anything public, legal or medical, have a fluent speaker review it before use.