Free Writing & AI Online

Free writing tools: paraphrasing tool, AI content detector, text summarizer, citation generator, plagiarism checker, hashtag generator, and more. No account required.

AI Text Simplifier✦ AI

Simplify complex text with AI. Rewrite content at 3rd grade to college reading level. Improves Flesch-Kincaid score instantly. Free, no sign-up.

Transform complex, hard-to-read text into clear, simple writing with our free AI Text Simplifier. Choose your target reading level — from 3rd grade to college — and AI will rewrite your content while preserving the original meaning. Perfect for making academic papers accessible, simplifying legal documents, creating easy-to-read content for broader audiences, and improving Flesch-Kincaid readability scores. Powered by advanced AI, results are instant and natural-sounding.

✦ FreeNo sign-up

AI Content Brief Generator✦ AI

Generate a complete content brief from any keyword with AI. Get article title, outline, target word count, questions to answer, and related keywords. Free.

Plan your next article or blog post with our free AI Content Brief Generator. Enter any keyword or topic and AI will create a comprehensive brief including a suggested title, target word count, full H2 outline with subpoints, questions your article should answer, related keywords to target, tone recommendation, and target audience description. Perfect for content marketers, SEO writers, bloggers, and anyone who wants a structured starting point for their writing.

✦ FreeNo sign-up

AI Content DetectorHot

Detect AI-written content with 15-signal analysis. Checks for ChatGPT, Claude, Gemini patterns. Free, no sign-up, more accurate than QuillBot.

Our AI Content Detector uses 15 linguistic signals to determine whether text was written by a human or generated by AI models like ChatGPT, Claude, or Gemini. We analyze pseudo-perplexity (how predictable word choices are), burstiness (variation in sentence length), n-gram repetition, passive voice density, vocabulary richness, transitional phrase density, hedging patterns, and more. The result is a precise 0–100% AI probability score with a full breakdown of every signal — so you understand exactly why text was flagged. Free, unlimited, and no account required.

✦ FreeNo sign-up

Paraphrasing ToolHot

Paraphrase any text in Standard, Fluency, or Creative mode. Free online paraphrasing tool — no sign-up, no limits.

Rewrite any text instantly with our free Paraphrasing Tool. Choose between three modes: Standard (clean reword), Fluency (smooth, natural language), or Creative (bold rewrites with fresh phrasing). Ideal for students, bloggers, content writers, and professionals who need to rephrase content while preserving the original meaning. Unlike other tools, ours works entirely in your browser — no API calls, no data sent to servers, no word limits. Paste your text, pick a mode, and get a rewritten version in seconds.

✦ FreeNo sign-up

Plagiarism CheckerHot

Check your text for repeated phrases and self-plagiarism instantly. Free plagiarism checker — no sign-up, no upload limits.

Our free Plagiarism Checker scans your text for repeated phrases, duplicate sentences, and self-plagiarism patterns. Paste your essay, article, or any written content and get an instant similarity report highlighting repeated sections. Perfect for students checking essays before submission, content writers verifying uniqueness, and professionals reviewing documents. The tool runs entirely in your browser — nothing is uploaded or stored. Get a clear percentage score and see exactly which phrases are flagged.

✦ FreeNo sign-up

Text SummarizerPopular

Summarize long articles, essays, and documents in seconds. TF-IDF extractive summarizer — bullet points or paragraph. Free, no sign-up.

Condense long articles, reports, essays, and documents into clear summaries with our free Text Summarizer. Using TF-IDF (Term Frequency-Inverse Document Frequency) extractive summarization, it identifies the most important sentences and presents them as a bullet-point or paragraph summary. Adjust the summary length from brief (3 key points) to comprehensive (full overview). Ideal for students, researchers, journalists, and anyone who needs to digest long content quickly. Runs entirely in-browser — no data is ever uploaded.

✦ FreeNo sign-up

Citation GeneratorPopular

Generate accurate citations in APA, MLA, Chicago, and Harvard format for websites, books, and journals. Free, instant, no sign-up.

Generate perfectly formatted citations and references in APA, MLA, Chicago, and Harvard style with our free Citation Generator. Add websites, books, journal articles, and more — fill in the source details and get an instant, correctly formatted citation you can copy directly into your paper. No more worrying about punctuation, italics, or ordering. Perfect for students, researchers, and academics writing essays, dissertations, and research papers.

✦ FreeNo sign-up

Business Name Generator

Generate 30 creative business name ideas instantly. Portmanteau and alliteration engine. Free online business name generator.

Find the perfect name for your business, startup, or brand with our free Business Name Generator. Enter keywords describing your business and generate 30 unique name ideas using portmanteau (word blending), alliteration, and creative combination engines. Get catchy, memorable names that are brandable and easy to spell. Refresh as many times as you want until you find the perfect name.

✦ FreeNo sign-up

Email Subject TesterPopular

Test and score your email subject lines for open rate potential. Checks power words, length, spam triggers, and more. Free, instant results.

Write email subject lines that get opened. Our free Email Subject Tester scores your subject line from 0 to 100, analyzing power word usage, length optimization (ideal is 35–50 characters), spam trigger words, question marks, number usage, and urgency signals. Get actionable tips to improve your score and maximize open rates. Essential for email marketers, newsletter writers, and anyone running email campaigns.

✦ FreeNo sign-up

Hashtag GeneratorHot

Generate 30 targeted hashtags for Instagram, TikTok, LinkedIn, and Twitter. Grouped by reach size. Free hashtag generator, no sign-up.

Generate 30 targeted hashtags for any topic, niche, or platform with our free Hashtag Generator. Enter your topic or keywords and get hashtags grouped by size — mega (1M+ posts), large (100K–1M), medium (10K–100K), and niche (under 10K) — so you can mix and match for maximum reach. Optimized for Instagram, TikTok, LinkedIn, and Twitter. Copy all 30 hashtags with one click and paste directly into your post.

✦ FreeNo sign-up

Markdown EditorNew

Write Markdown with a live HTML preview side by side. Download as .md file. Free online Markdown editor — no sign-up required.

Write and preview Markdown in real time with our free Markdown Editor. The split-pane view shows your Markdown source on the left and the rendered HTML on the right, updating live as you type. Supports all standard Markdown syntax — headings, bold, italic, lists, links, images, code blocks, tables, and blockquotes. Download your work as a .md file instantly. Perfect for developers writing documentation, writers drafting README files, and bloggers using Markdown-based CMS platforms.

✦ FreeNo sign-up

Word Frequency CounterNew

Paste any text and see the most frequently used words as a bar chart. Excludes stop words. Free word frequency analyzer online.

Discover the most frequently used words in any text with our free Word Frequency Counter. Paste your article, essay, or any text and get an instant bar chart showing word frequency ranked from most to least common. Stop words (the, a, is, etc.) are automatically excluded so you see meaningful content words. Useful for SEO keyword density analysis, academic text analysis, writing style review, and content optimization.

✦ FreeNo sign-up

Grammar CheckerNew

Check your grammar, spelling, and punctuation for free. Get instant error highlights and fix suggestions. No sign-up required.

Catch grammar, spelling, and punctuation errors instantly with our free Grammar Checker. Paste any text and get color-coded highlights for different error types — grammar mistakes in red, spelling errors in blue, and punctuation issues in yellow. Each error includes a suggested fix you can apply with one click. Powered by a comprehensive client-side rule engine covering subject-verb agreement, tense consistency, common misspellings, comma splices, run-on sentences, and more. Perfect for students, writers, bloggers, and professionals who want polished, error-free writing.

✦ FreeNo sign-up

Writing Tone DetectorNew

Detect the tone of your writing — formal, casual, persuasive, academic, or friendly. Free online tone analyzer with instant results.

Understand the tone of your writing with our free Tone Detector. Paste any text and get an instant analysis showing the dominant tone — formal, casual, persuasive, academic, friendly, or assertive — with confidence percentages for each. The tool analyzes word choice, sentence structure, punctuation patterns, and vocabulary level to determine your writing's emotional register. Perfect for marketing copy, professional emails, academic papers, and social media posts where tone matters.

✦ FreeNo sign-up

Essay GraderNew

Grade your essay for free. Get a score from 0–100 across structure, grammar, vocabulary, and readability. Instant letter grade. No sign-up.

Get your essay scored and graded with our free Essay Grader. Paste your essay and receive a comprehensive score from 0 to 100, broken down across five criteria: Structure (paragraph organization, intro/conclusion), Grammar (error density), Vocabulary (diversity and sophistication), Readability (Flesch-Kincaid alignment), and Length (appropriate word count). Get a letter grade from A+ to F with specific, actionable feedback on how to improve. Perfect for students preparing assignments, test-takers practicing essays, and writers self-editing.

✦ FreeNo sign-up

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About Writing & AI

Professional writing tools that rival paid alternatives like Grammarly, QuillBot, and GPTZero — completely free. Detect AI-generated content with 15-signal analysis, paraphrase text in multiple modes, summarize long documents, generate APA/MLA citations, check for plagiarism, analyze grammar and tone, simplify complex text with AI, create content briefs from keywords, and generate hashtags for social media. Every tool works without creating an account or paying a subscription. Ideal for students, bloggers, content marketers, and academic writers.

Frequently Asked Questions

Can the AI detector identify ChatGPT text?

Yes — the AI Content Detector uses 15 linguistic signals to detect text from ChatGPT, Claude, and Gemini with a detailed breakdown of each signal.

Is the paraphrasing tool unlimited?

Yes — unlike QuillBot which limits free users to 125 words, Zerocosttools has no word or character limits on paraphrasing.

What citation formats are supported?

The Citation Generator supports APA, MLA, Chicago, and Harvard formats for books, articles, websites, and more.