Autocorrect Units

Tracking since Apr 1, 2026.

Changelog

• Apr 16, 2026
  description

  This extension automatically and seamlessly corrects any measurement units and quantities while typing on a web page. For example, type "5c" into a text box and press space (or any punctuation) to convert it to "5 °C", the proper formatting for the unit (degrees Celsius). Similarly, typing "40,000 kms" will correct to "40 000 km"; i.e., the unit symbol will be replaced by the proper one, the comma will be replaced by a non-breaking thin space (the official thousands separator), and the space will be replaced by a non-breaking space (so that text will not wrap in between the "40 000" and "km"). Data never leaves your browser, so there are no privacy concerns.
  
  The primary goal of the extension is to prevent improperly or unofficially formatted measurement units, but it's also very helpful in formatting units with "shortcuts" to avoid finding, copying, and pasting characters from a character map, etc. So you can type the units in basically every variant imaginable, and it will autocorrect to the proper format. This goal, however, means that some trade-offs are made. In the first example, for instance, "C" actually refers to coulombs while "°C" refers to degrees Celsius, but the latter is meant far more frequently, so "C" is corrected to "°C" nevertheless.
  
  In rare cases where the extension produces strange results, you can turn it off temporarily by pressing the extension's button in the browser toolbar. The list of units it supports is not exhaustive, so if the extension doesn't autocorrect your favourite unit, let me know in the feedback and I'll add it in.

  Automatically corrects measurement units as you type; supports SI, imperial, and US customary units.
  
  ──────────────────────────────────────────
  
  HOW IT WORKS
  
  Type a measurement into any text box, then press Space or punctuation; it's instantly corrected to the proper format. For example:
  
  𝟱𝗰                      →  𝟱 °𝗖
  𝟰𝟬,𝟬𝟬𝟬 𝗸𝗺𝘀  →  𝟰𝟬 𝟬𝟬𝟬 𝗸𝗺
  
  ──────────────────────────────────────────
  
  WHAT GETS CORRECTED
  
  • Unit symbols — replaced with official notation
  • Thousands separators — commas replaced with non-breaking thin spaces, the universal thousands separator
  • Number–unit spacing — non-breaking spaces prevent awkward line wraps
  
  ──────────────────────────────────────────
  
  GOOD TO KNOW
  
  🔒 Private — your data never leaves your browser.
  📋 Accepts units in virtually any variant you can type.
  ⚠️ Some shortcuts favour common usage over strict SI (e.g. "C" corrects to °C, despite coulombs being valid).
  🔧 Getting odd results? Click the toolbar icon to temporarily disable the extension.
  💬 Missing a unit? Request it via email and I'll add it.

Permissions & access

Permissions

tabsscriptingstorage

Host access

<all_urls>

Screenshots

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