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How to Check Readability in Google Docs — Flesch-Kincaid Score Without Add-Ons

Last updated: April 20265 min readWriting Tools

Google Docs has no built-in readability checker. No Flesch-Kincaid score, no grade level, no reading ease. Here is how to check your Google Doc's readability in 3 seconds — no add-on needed.

Check your Google Doc's readability — paste text, get scores.

Open Readability Scorer

The 3-Second Method (No Add-On)

  1. In Google Docs, select all text: Ctrl+A (Windows) or Cmd+A (Mac)
  2. Copy: Ctrl+C or Cmd+C
  3. Open the readability scorer in a new tab
  4. Paste: Ctrl+V or Cmd+V
  5. Scores appear instantly — Flesch-Kincaid Grade Level, Reading Ease, Gunning Fog, SMOG

That is it. No add-on to install, no permissions to grant, no waiting for a menu extension to load.

Why Not Use a Google Docs Add-On?

FactorAdd-OnCopy → Online Tool
Setup time~3-5 min to find, install, authorize✓ None — paste and go
Permissions✗ Requires access to your documents✓ No permissions — text never leaves your browser
Privacy~Your text is processed by the add-on's servers✓ 100% local processing
Speed on long docs~Can be slow (30+ seconds)✓ Instant on any length
Scores availableVaries by add-on — often just Flesch✓ Flesch + Gunning Fog + SMOG
CostSome add-ons are paid after trial✓ Free forever
Works offline✗ Requires internet for add-on✓ Tool runs in browser (after load)

Google Docs vs Word — Readability Features

FeatureGoogle DocsMicrosoft WordOnline Checker
Built-in Flesch-Kincaid✗ No✓ Yes (after setup)✓ Yes
Built-in Gunning Fog✗ No✗ No✓ Yes
Built-in SMOG✗ No✗ No✓ Yes
Setup requiredN/AEnable setting + run spell checkNone
Passive voice %✗ No✓ Yes✗ No
Works on partial textN/A✓ Select then check✓ Paste selection
Mobile supportN/A✗ Desktop app only✓ Any device

Workflow for Google Docs Writers

If you write in Google Docs, build readability checking into your publishing workflow:

  1. Write and edit your document in Google Docs
  2. Before publishing: Ctrl+A → Ctrl+C → paste into readability scorer
  3. Check grade level — targeting 6-8 for web content, 5-7 for emails
  4. If too high, simplify: shorter sentences, simpler words, active voice
  5. Use tone rewriter for automatic simplification
  6. Run grammar check on simplified text
  7. Final readability check — confirm improvement before publishing

Keep the readability scorer bookmarked. With Google Docs lacking native support, this becomes your go-to tab for every document.

Google Docs has no readability checker — this one is free and instant.

Check Readability Now
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