DeepL

DeepL produces noticeably more natural translations than general-purpose tools, particularly for European languages, and its document translation preserves formatting. The writing assistant extends the same engine to improving your own sentences. The free tier has a character limit per translation.

Where it falls short

Coverage of less-resourced languages is weaker, and the free tier's limits make it impractical for volume work.

Alternatives in Writing & Content

• Grammarly
  Proofreading that catches more than a spellchecker.
• Hemingway Editor
  Highlights the sentences that are hard to read.
• QuillBot
  Paraphrasing tool for rewording, with a useful grammar check.