Hemingway-Style Readability Editor

What each color highlights

How to Use the Hemingway-Style Readability Editor

1. Paste your draft into the editor. The live coach on the right counts words, sentences, reading time, and shows an instant grade estimate as you type.
2. Pick a target reading grade. Hemingway aimed for 6. Plain-language style guides recommend 6 to 9 for general audiences. Pick higher only if your readers are domain specialists.
3. Click Analyze writing. The annotated text appears below with the five highlight colors. Click any inline highlight (or tap on mobile) to read a fix suggestion.
4. Edit the highlighted sentences in your draft and re-run the analysis. The verdict bar turns from red toward green as the grade drops.
5. Tick Show Hemingway-cleaned rewrite to see an auto-generated version with adverbs cut and wordy phrases swapped — useful as a side-by-side hint, not a finished draft.

The Reading-Grade Formula

The editor blends two industry-standard formulas and displays the average.

Automated Readability Index — character-based, used by the original Hemingway app and US Department of Defense documents:

\( \text{ARI} = 4.71 \times \dfrac{\text{characters}}{\text{words}} + 0.5 \times \dfrac{\text{words}}{\text{sentences}} - 21.43 \)

Flesch-Kincaid grade — syllable-based, used by Microsoft Word and US federal style guides:

\( \text{FK} = 0.39 \times \dfrac{\text{words}}{\text{sentences}} + 11.8 \times \dfrac{\text{syllables}}{\text{words}} - 15.59 \)

Averaging the two smooths out the rough edges. ARI penalizes long words by character count; FK penalizes by syllable count. On short text or text with many short technical terms, each formula alone gives shaky numbers. The average is steadier.

Why Hemingway picked grade 6

Ernest Hemingway wrote at roughly a sixth-grade reading level. So did George Orwell, Cormac McCarthy, and a long list of plain-prose stylists. Grade 6 is not a ceiling for ideas — it is a ceiling for sentence mechanics. Complex ideas survive better in short sentences than in long ones, because the reader can pause and absorb each step.

The US Plain Writing Act of 2010 requires federal agencies to publish public-facing documents in plain language. The UK gov.uk style guide recommends grade 9 or below. Marketing research from Boomerang and Mailchimp shows the best-performing email subject lines and body copy run between grade 6 and 8. There is no genre where higher grade level helps the reader; there are only genres where the writer can get away with it.

What the editor does not do

• It does not check grammar or spelling. Use a dedicated grammar checker for those.
• It does not rewrite for you. The Hemingway-cleaned preview is a hint, not an answer. Final wording is yours.
• It does not flag every problem. Tone, jargon, weak verbs that are not adverb-backed, and metaphor mismatches need a human eye.
• It does not understand context. Sometimes a passive voice clause is the right choice (the actor is unknown or unimportant). The highlight is a prompt to think, not a command to delete.

Passive-Voice Detection in Plain English

The editor looks for a form of to be (am, is, are, was, were, be, been, being) followed within three words by a past participle (written, taken, broken, used, considered). It also handles common modal-plus-be patterns ("will be written", "should have been chosen") and skips short adverbs in between. It will not flag the past tense alone ("he wrote") — only the passive construction ("it was written by him").

Wordy Phrases the Editor Looks For

The dictionary covers roughly 80 phrases. A small sample, with the suggested replacement:

These are not absolute rules. "In order to" is occasionally clearer than "to" for rhythm or emphasis. The editor flags the phrase; you decide whether to keep it.

Hemingway vs Other Readability Tools

Six Edits That Drop Grade Level Fast

1. Split any 30+ word sentence into two. Usually a 2-3 grade drop on that sentence alone.
2. Cut "very", "really", "quite", "rather", and most -ly adverbs. Half the time you do not need the modifier; the other half a stronger verb works better.
3. Replace "in order to" with "to". Same meaning, 67% shorter.
4. Replace "due to the fact that" with "because". Same meaning, three fewer words every time.
5. Rewrite passive clauses as active. "The decision was made by the board" → "The board decided".
6. Lead with the subject. Move the actor to the start of the sentence, the verb next, the object last.

Edge Cases the Editor Handles

• Abbreviations (Mr., Dr., Inc.) are not treated as sentence ends because the next word must start with a capital letter and a space.
• Words ending in -ly that are nouns or non-adverbs (family, supply, only, reply, holy, July) are skipped via a curated whitelist.
• The past participle list includes ~150 irregulars so passive voice catches "written", "taken", "broken", "begun", "chosen" even though they do not end in -ed.
• Long contractions ("there's", "they've") are tokenised as single words so word count and grade are not skewed.

Privacy and Limits

The editor analyzes your text on our server only to render this page and never stores it. The live mini-stats while you type run entirely in your browser. There is no third-party tracking of the content you paste. Maximum input is 50,000 characters per analysis (roughly a 15 to 20 page document).

FAQ

What does this editor highlight?

Five things: long sentences (20+ words, yellow), very long sentences (30+ words, red), adverbs that weaken verbs (blue), passive voice clauses (green), and overly complex phrases with a clearer alternative (purple). Click any highlight to read a one-line suggestion.

What reading grade does it use?

It blends two industry-standard formulas: the Automated Readability Index (character-based, used by Hemingway) and the Flesch-Kincaid grade (syllable-based, used by Microsoft Word). The displayed grade is the average of both, which smooths over the weaknesses of either formula on short text.

Why grade 6?

Ernest Hemingway wrote at roughly a sixth-grade level. Plain-language guidelines (US Plain Writing Act, UK Gov.uk style) also recommend grade 6 to 9 for general audiences. Higher grades exclude readers — at grade 12, you lose roughly half the adult population.

How is passive voice detected?

The editor looks for a form of "to be" (am, is, are, was, were, be, been, being) followed within three words by a past participle (written, taken, broken, used, considered, ...). It handles common irregular participles and skips intervening adverbs.

Will it edit my text for me?

It will not auto-edit your draft. It does show a Hemingway-cleaned rewrite preview that drops cut-able adverbs and swaps wordy phrases for shorter alternatives, so you can compare against your original. Your final wording is always your own decision.

Does it send my text anywhere?

The editor analyzes your text on our server only to render this page, and never stores it. The live mini-stats while you type run entirely in your browser. There is no third-party tracking of the content you paste.

Why is a passive sentence sometimes the right choice?

When the actor is unknown ("The window was broken overnight"), when the actor is unimportant ("The vote was passed unanimously"), or when you want to put the action — not the actor — at the start of the sentence for emphasis. The editor highlights every passive clause, but you should keep the ones that earn their place.

Does it work in languages other than English?

The sentence splitter and grade formulas work on any Latin-alphabet text, but the adverb whitelist, the passive-voice detector, and the wordy-phrase dictionary are English-only. Use our other text-statistics tools (such as the Readability Score Calculator) for general-purpose multilingual analysis.