Shorten your sentences first. Aim for an average sentence length under twenty words, and the rest of your readability problems start solving themselves.
That single change does more for engagement and rankings than almost any other edit you can make. Before anything else, run through this checklist:
- Average sentence length under 20 words
- Paragraphs capped at 2–4 sentences (fewer on mobile)
- A subheading every 200–300 words
- At least one list or bullet block per 400 words
- Plain words in place of jargon, unless you define the jargon once
- Active voice as the default, passive when the actor doesn't matter
- A readability check before you hit publish
- A mobile preview check before you hit publish
Target range: Flesch reading ease around 60 or higher for general content, and average sentence length under 20 words. Analyses of top-ranking pages show they tend to average a Flesch score near 59.3, which lines up almost exactly with that target. Mike, the author of this guide, has built these checks into Inspirowrite's own editorial workflow because faster, clearer drafts win more often than clever ones.
Key Takeaways
Shorter sentences, clear structure, and plain vocabulary raise both readability scores and search performance because they reduce the friction that causes readers to leave.
| Point | Details |
|---|---|
| Cap sentence length | Keep the average under 20 words; comprehension drops sharply as sentences lengthen. |
| Target Flesch 60+ | Aim for a reading ease score around 60 for general content, adjusting by platform. |
| Break up paragraphs | Limit paragraphs to 2–4 sentences, tighter still on mobile screens. |
| Use headings and lists | Add a subheading every 200–300 words and convert 3+ item series into lists. |
| Check before publishing | Run a readability tool and a mobile preview as the final two steps before going live. |
| Speed up edits with Inspirowrite | Inspirowrite runs grammar, tone, and readability checks in seconds without storing your draft. |
Table of Contents
- Sentence and word-level tactics for readability for SEO
- Structure and formatting for scanning and retention
- Voice, transitions and phrasing that keep readers moving
- Making readability work for every reader, not just search engines
- How to use readability metrics without gaming them
- A revision checklist you can run before every publish
- Editorial lessons from years of readability edits
- Speed up your readability edits with Inspirowrite
- Sources
- FAQ
Sentence and word-level tactics for readability for SEO
Long sentences don't just sound clunky, they cost you readers mid-sentence. Comprehension sits near 100% at around eight words per sentence and drops to 77% by the time you hit 28 words. That's not a small dip. It's a quarter of your readers losing the thread before they reach your point.
Three edits fix most of the damage:
- Split anything over 25 words. If a sentence needs a comma and a conjunction to survive, it usually wants to be two sentences.
- Cut nominalisations. "Conducted an evaluation of" is "evaluated." "Made a decision" is "decided." Turning noun phrases back into verbs shortens sentences without losing meaning.
- Replace multi-syllable words with plain alternatives. "Utilise" becomes "use." "Facilitate" becomes "help." "Subsequent" becomes "next." None of this dumbs down the writing, it just removes friction.
Search your draft for filler words like "very," "really," "basically," and "in order to," then delete them on sight. They add length without adding meaning, and length is exactly what you're trying to cut.
Mix sentence lengths deliberately. A page of uniform 15 word sentences reads as flat as a page of 30 word ones. Follow a short, punchy line with a longer one that earns its length, and the rhythm carries the reader forward.
Pro Tip: Read your draft aloud before publishing. Your ear catches awkward rhythm and overlong clauses that your eye skips right past.
Structure and formatting for scanning and retention
Readers scan before they commit to reading. Give them a page they can scan successfully, and they're far more likely to stay for the detail.
Break your content into topical blocks of roughly 200 to 300 words, each under its own H2 or H3. This does two things: it gives search engines a clear map of what the page covers, and it gives a scanning reader landmarks to jump between. A strong headline at each section break earns its keep by telling the reader exactly what they'll get if they keep going.
Paragraph length matters more on mobile than most writers assume. Keep paragraphs to two or three sentences for phone screens, and you can stretch slightly longer on desktop where the reading window is bigger. Either way, a wall of text is the single fastest way to trigger a bounce.
Convert anything with three or more sequential items into a bulleted or numbered list:
- Steps in a process
- Comparable options
- Requirements or criteria
- Any series where order or grouping matters
Prose that forces a reader to hold four items in their head at once is prose that gets skipped. Bold your key terms so a skimmer catches the load-bearing words even if they never read the full sentence, and open sections with a short, direct lead sentence before you add nuance. Structure advice like this also underpins how paragraphs should be built for clarity in general, not just for search.
Voice, transitions and phrasing that keep readers moving
Active voice puts the actor first: "Google indexes the page," not "the page is indexed by Google." It's shorter, clearer, and easier to follow. Passive voice isn't wrong, though. Use it when the actor genuinely doesn't matter: "the report was published in March" reads fine because nobody cares who hit send.
Transition words earn their place when they signal a real shift in logic, not when they're padding:
- Use "however" or "but" to signal contrast
- Use "because" or "since" to signal cause
- Use "for example" to introduce a concrete case
- Skip "furthermore" and "moreover" unless you genuinely need the weight
Keyword stuffing is a habit worth breaking entirely. Place your main term naturally in the title, the opening, and a couple of headings, then let related phrasing carry the rest of the article. Search engines read context now, not repetition counts, and human readers notice forced phrasing immediately.
Define jargon the moment it appears, in a short parenthesis if that's cleanest: "SMOG (a readability formula that flags long words) works well for specialist content." One clean definition beats three vague hints scattered through the piece. This overlaps closely with writing that reads naturally rather than like it was assembled from a keyword list.
Making readability work for every reader, not just search engines
Plain language isn't a compromise, it's an accessibility requirement and an SEO signal at the same time. A screen reader depends on logical heading order to navigate a page, so an H3 that skips ahead of its H2 breaks the experience for anyone using assistive technology, not just for crawlers.
Match your grade level to who's actually reading:
- General consumer content: aim for an 8th or 9th grade reading level
- Technical or B2B content: a higher grade level is fine if your audience expects precision
- Health or medical content: lean on formulas built for vocabulary complexity, not just sentence length
A specialist audience reading a clinical or legal piece won't be put off by longer words they already know. The mismatch happens when general content borrows that vocabulary unnecessarily.
How to use readability metrics without gaming them
Flesch reading ease reacts mostly to two things: sentence length and syllable count. That's why the sentence-length fixes above move your score faster than almost any other edit. General web content should land around a Flesch score of 60 or above, and platform norms shift the target slightly, with blog content typically sitting somewhere in the 55 to 70 range and social copy pushing higher still.
Keeping average sentence length below twenty words remains the single most reliable lever, and it's worth tracking on its own rather than folding it entirely into one composite score.
Not every formula suits every topic, though. When a piece keeps scoring poorly despite short sentences, the problem is usually vocabulary, not structure, and that's where the SMOG formula earns its place, since it was built specifically to flag multi-syllable words in health and specialist writing.
Treat a readability checker as an editorial lens, not a scoreboard. Action the flags that point to genuinely long sentences or dense vocabulary. Ignore the ones that ding you for using a necessary technical term your audience already understands, because a technical audience reading at a slightly higher grade level isn't a failure, it's accuracy.
A revision checklist you can run before every publish
Run this in order, and you'll catch most readability problems before a reader ever sees them:
- Check that the core answer or claim appears in the first two sentences.
- Scan for any sentence over 25 words and split it.
- Swap complex or multi-syllable words for plain ones where meaning allows.
- Add a subheading if any block runs past 300 words without one.
- Run the draft through a readability checker and act on genuine flags.
- Preview the piece on a phone screen and check paragraph length holds up.
Fold this into your existing workflow rather than treating it as a separate stage: the writer runs steps one through four during drafting, and an editor or QA pass handles five and six before anything goes live.
Speed and confidentiality matter here as much as the checklist itself. A tool that takes two minutes to return feedback, or one that stores your unpublished draft on a server somewhere, undermines the whole point of a pre-publish check.
Mike built Inspirowrite's own review process around exactly this sequence, prioritising fast turnaround and private processing so drafts never leave the writer's control before they're ready.
Editorial lessons from years of readability edits
The biggest gains rarely come from vocabulary. They come from sentence length and paragraph breaks, edits writers resist because they feel like they're losing nuance. They're not. Match the target to your actual reader, not to a generic score, and the nuance survives just fine.
— Mike
Speed up your readability edits with Inspirowrite
Running the checklist above by hand takes time, and most writers skip steps under deadline pressure. Inspirowrite checks sentence length, word choice, and tone in seconds rather than minutes, and it never stores or trains on your drafts, which matters if you're editing unpublished client work or sensitive company content.
It handles grammar correction, rephrasing, shortening, and tone adjustment in one pass, so you're not bouncing between four separate tools to run through the checklist in this guide. For teams, history tracking and API access mean the same standard applies across every writer on staff, not just whoever remembers to check manually. Start with the free plan at Inspirowrite and run your next draft through it before you publish.
Sources
- SEO content — DXStudio (Michigan State University)
- SMOG readability guidance — Harvard T.H. Chan School of Public Health
- Readability score for SEO — WildandFree Tools
FAQ
What is the 80/20 rule in SEO?
Fixing those two elements first outperforms hours spent polishing vocabulary.
Is a 37 readability score good?
A Flesch score in the fairly difficult range sits closer to academic or technical writing than general web content. For most blog and marketing content, pushing toward 60 or above will serve readers better.
Is SEO dead or evolving in 2026?
SEO isn't dead, it's shifted toward rewarding content that satisfies readers quickly, which is exactly why readability now overlaps so heavily with ranking performance. Clear, well-structured writing remains one of the most reliable levers available.
What is SEO readability?
SEO readability is the practice of writing content that's easy for both readers and search engines to process quickly, measured through metrics like Flesch reading ease and average sentence length. It matters because pages ranking well tend to score higher on these measures than pages further down the results.
How does Inspirowrite help with readability edits?
Inspirowrite checks grammar, sentence structure, and tone in seconds and processes text privately without using it to train other models, which suits writers who need fast, confidential feedback before publishing.