Free Language Detector Online

What is a Language Detector?

A language detector is a tool that analyzes a piece of text and identifies which human language it is written in. It looks at patterns in the text, such as the characters used, common short words, and script (alphabet), to work out the most likely language without any prior information from the user.

Language detection is language independent in the sense that it can recognize dozens of languages using the same underlying engine. Whether you paste English, Spanish, Arabic, Hindi, or Japanese text, the tool applies the same script and pattern analysis and labels the result with its two-letter ISO 639-1 language code.

This particular tool performs every step of detection locally in your browser using JavaScript. No text is uploaded to a server or third-party API, which makes it fast and safe to use with sensitive content.

Why Use a Language Detector?

Language detection is useful whenever an application, workflow, or team needs to know what language a piece of text is in before deciding what to do with it. Here is where teams put it to work:

• Content Routing: Automatically route articles, reviews, or tickets to the right translation or moderation queue based on their language.
• Multilingual Data Cleanup: Tag multilingual data sets by language before running a word count or character count pass on each language separately.
• Support Ticket Tagging: Tag incoming support tickets by language so they reach an agent who can reply in that language.
• Locale Validation: Confirm that user-submitted content matches the locale a form or field expects before it is saved.
• Multilingual Test Case Organization: Detect the language of test data or bug reports before filing them, so localization test cases in Test Manager stay grouped by locale.

How Does Language Detection Work?

This tool combines two detection strategies. First, it scans the Unicode ranges of the characters in your text to identify the writing system: for example, Cyrillic, Arabic, Devanagari, Han, Hiragana, Katakana, Hangul, Thai, Hebrew, or Greek. Scripts that map to a single language, such as Thai or Korean, are resolved immediately.

For text written in the Latin alphabet, many languages share the same characters, so the tool falls back to stopword frequency analysis: counting how often extremely common short words (like “the”, “de”, “le”, “und”, or “het”) for each candidate language appear in your text, together with a bonus for language-specific accented characters:

function scoreLanguage(text, stopwords) {
  const words = text.toLowerCase().split(/[^a-zà-ÿ]+/);
  return words.filter((w) => stopwords.includes(w)).length;
}

The language with the highest combined score is returned as the detected language, and the next two candidates are shown as alternate matches with their own confidence percentages so you can see how close the decision was.

Language Detector Features

• Detect Language: Identifies the most likely language of any pasted or typed text.
• Confidence Breakdown: Shows the top 3 candidate languages with confidence percentage bars.
• Auto Detect: Toggle real-time detection so results update as you type or paste.
• 35+ Languages: Covers major Latin, Cyrillic, Arabic, Devanagari, and CJK (Chinese, Japanese, Korean) languages.
• No API Calls: Detection runs fully client-side in JavaScript, so your text is never sent to a server.
• Load file via URL: Load text via a raw URL to detect its language directly.
• Upload text file: Upload a .txt file from your device to analyze its content.
• Copy & Download Result: Copy the detection summary to your clipboard or download it as a text file.
• Word & Character Count: Live counters for the text you enter, useful for judging detection reliability.

Pair the detector with the Case Converter to normalize casing once you know the language, the Text Compare tool to diff multilingual strings, or the Unicode Text Converter to inspect the exact characters behind a detection.

How to Use the Language Detector?

Detecting the language of a piece of text takes only a few seconds and needs no setup. Follow these steps:

• Paste or upload your text: Type, paste, upload a .txt file, or load text from a URL into the Enter Value field.
• Run detection: Leave Auto Detect on so results appear as you type, or click Detect Language to analyze the text on demand.
• Review the result: See the detected language, its ISO 639-1 code, a confidence score, and the top 3 candidate matches in the Output panel.
• Copy or download the result: Click Copy Result for a short clipboard summary, or Download to save the full breakdown as a text file.

Supported Languages

The detector currently recognizes the following languages: