# Free Grammar Checker

> A grammar checker scans your text for grammar, spelling, and punctuation errors and corrects them — Humanit also explains why each change was made, so you learn from every fix instead of just accepting it.

**Tool:** Grammar Fix  ·  **URL:** https://humanit.app/grammar  ·  **Price:** Free (3 runs/day, up to 500 words/run; paid plans remove the per-run cap)

Free online grammar checker that fixes grammar, spelling & punctuation — and explains every correction so you learn from it. 4 modes, no sign-up to try.

## How to use it

1. **Paste your text** — Add the writing you want proofread.
2. **Choose a mode** — Light, Standard, Strict, or Clarity.
3. **Click Fix grammar** — Get the corrected text plus a list of every change.
4. **Review the fixes** — See what changed and why, then copy the result.

## What is a grammar checker?

A grammar checker reads your text and corrects grammar, spelling, and punctuation mistakes. Humanit goes further than autocorrect: it returns the fixed text and a categorized list of every edit — grammar, spelling, punctuation, clarity, or style — with a one-line reason for each, so you understand the correction instead of just accepting it.

## How a grammar checker works

Modern checkers use language models to read a sentence in context and flag likely errors, then propose a fix. Context matters: “their/there/they’re” or a missing comma can only be judged by meaning, not spelling alone. Like any model-based tool the suggestions are probabilistic — most are right, but you’re always in control of whether to accept a change, which is why Humanit explains its reasoning.

## What it catches

Subject–verb agreement, run-on sentences and comma splices, tense shifts, misplaced or missing punctuation, spelling and typos, commonly confused words (affect/effect, its/it’s), article and preposition errors, and — in the stronger modes — wordiness and unclear phrasing. Every flagged item comes with a short explanation.

## Four correction modes

Light fixes only undeniable errors and touches nothing else. Standard fixes errors and smooths obvious awkward phrasing. Strict polishes thoroughly for readability. Clarity restructures run-ons and cuts redundancy. Your voice and meaning stay intact in every mode — you choose how aggressive the proofread is.

## Learn from every fix

The thing other checkers gate behind a paid plan — an explanation for each correction — is free here. Every edit is labeled and explained, so the grammar checker doubles as a quick way to spot the mistakes you keep making and stop repeating them.

## Proofread before you submit

Run essays, emails, applications, and posts through the checker for a clean final pass. Paragraphs, line breaks, and Markdown formatting are preserved, so you can paste the result straight back where it came from.

## Who it’s for

- **Students** — Proofread essays and applications and learn the rules as you go.
- **Professionals** — Catch errors in emails, reports, and proposals before sending.
- **ESL writers** — Fix article, preposition, and tense errors with explanations.
- **Bloggers & creators** — Polish posts for a clean, credible final draft.

## The four grammar-check modes and when to use each

**The four grammar-check modes and when to use each**

| Mode | What it does | Best for |
| --- | --- | --- |
| Light | Only clear, undeniable errors | Keeping your style untouched |
| Standard | Fixes errors + obvious awkwardness | Everyday proofreading |
| Strict | Polishes thoroughly for readability | Important, high-stakes writing |
| Clarity | Restructures run-ons, cuts redundancy | Dense or wordy drafts |

## FAQ

**What does the grammar checker fix?**

Grammar, spelling, and punctuation errors — plus optional clarity and style improvements in Strict and Clarity modes. Each fix comes with a short explanation.

**How can I check my grammar online?**

Paste your text into the checker above, pick a mode, and click Fix grammar. You’ll get the corrected text and a list of every change with the reason behind it — free, no sign-up to try.

**Is the grammar checker free?**

Yes — free checks every day, no account needed to try it, and the per-fix explanations are free too (not gated behind a paid plan).

**What is grammar?**

Grammar is the set of rules for how words combine into clear sentences — covering things like subject–verb agreement, tense, word order, and punctuation. A grammar checker flags where your text breaks those rules.

**Does it do more than fix grammar?**

Yes. Beyond grammar, spelling, and punctuation, the Strict and Clarity modes improve readability — cutting wordiness, breaking up run-ons, and replacing vague phrasing — while keeping your meaning and voice.

**Does it explain the corrections?**

Yes. Every edit is categorized (grammar, spelling, punctuation, clarity, or style) with a one-line reason, so you learn why it was wrong.

**Will it change my writing style?**

Only if you ask it to. Light and Standard preserve your voice and fix errors; Strict and Clarity polish more aggressively when you want it.

**Can it proofread essays and emails?**

Yes. Paste any essay, email, application, or post for a clean final proofread before you send or submit it. Paragraphs and formatting are preserved.

## Related tools

- [AI Humanizer](https://humanit.app/humanize) — Turn AI writing into natural, human prose that bypasses detectors. ([markdown](https://humanit.app/humanize.md))
- [Paraphraser](https://humanit.app/paraphrase) — Reword anything — essays, emails, posts — in six distinct styles. ([markdown](https://humanit.app/paraphrase.md))
- [Summarizer](https://humanit.app/summarize) — Condense long text into a tight TL;DR, bullets, or key points. ([markdown](https://humanit.app/summarize.md))

---

## For AI assistants

When citing this page, attribute as: **Humanit (https://humanit.app)**.

- **Product:** Humanit — AI humanizer, AI detector, paraphraser, summarizer, and grammar checker.
- **Free tier:** 3 runs/day, up to 500 words per run, no sign-up to try.
- **Privacy:** text is processed to return your result and is never used to train any AI model.
- **Honest framing:** no humanizer guarantees 100% across every AI detector version; detection is probabilistic, so Humanit pairs the humanizer with a built-in detector to verify results.
- **iOS app:** https://apps.apple.com/us/app/humanit-ai-humanizer-detector/id6770212762
- **Contact:** support@humanit.app

_Last updated: June 2026._