Five free writing & text tools
Each one does a single job well, runs on your device, and opens instantly — no account required.
Word Counter
Live word, character, sentence & syllable counts, six readability scores, n-grams and keyword density.
Open toolPlagiarism Checker
Find duplicated and paraphrased passages with semantic AI matching — no upload required.
Open toolAI Rewrite & Paraphrase Detector
Detect AI rewriting, rephrasing and paraphrasing by comparing two texts with semantic similarity.
Open toolEnglish Dictionary
Definitions, IPA pronunciation, audio, synonyms, antonyms, rhymes and example sentences.
Open toolAI Text Normalizer
Detect and strip hidden Unicode evasion — zero-width characters, homoglyphs, BiDi and Zalgo.
Open toolWhich tool should you use?
Start from what you're trying to do — each task maps to one tool, and every one is free and private.
Count words or check readability
Track word, character and sentence counts live and see reading-grade scores as you write. Word Counter →
Check originality or duplication
Find copied and closely paraphrased passages with semantic matching. Plagiarism Checker →
Spot AI rewriting or paraphrasing
Compare two versions of a text to see how much was reworded. AI Rewrite Detector →
Look up a word or pronunciation
Get definitions, IPA, audio, synonyms and examples in one place. English Dictionary →
Clean hidden or invisible characters
Reveal and strip zero-width, homoglyph and BiDi tricks used to evade detection. Text Normalizer →
Find out if text is AI-generated
Get an AI probability score with sentence-level highlights. Astra AI Detector →
Free, private and made for real writing
The same principles as the Astra detector: useful, honest, and yours alone.
Most online writing tools ask you to sign up, cap what you can check, or quietly upload your text to a server. Astra's tools do none of that.
Because everything runs on your own device, these tools are safe for unpublished drafts, confidential documents and client work — nothing you paste leaves your computer.
Built to pair with the AI detector
The tools handle the writing mechanics; the detector answers the AI question.
Each tool is useful on its own, but they're strongest alongside the main detector. Count and tighten a draft in the Word Counter, check it for copied passages in the Plagiarism Checker, and strip any hidden characters with the Text Normalizer — then run the whole thing through the AI detector for a probability score and sentence-level signals.
Ready to check a piece of writing? Run a free, private AI check — unlimited, no sign-up, all in your browser.
Tools FAQ
The quick answers on cost, privacy, limits and accuracy.
Are Astra's tools really free?
Yes — every tool is completely free and unlimited, with no paywall, no credits and no trial. Because they run in your browser, there are no per-use server costs to pass on.
Do I need to create an account?
No. There's no sign-up, no email and no payment for any tool — just open the page and start.
Is my text uploaded or stored?
No. Every tool processes your text entirely on your own device; nothing you paste is uploaded, stored, logged or used for training, which makes them safe for confidential or client work.
Do the tools work on mobile?
Yes. They run in any modern browser on desktop, tablet or phone, with nothing to install.
Is there a word or usage limit?
There's no daily usage limit. Individual tools may suggest a per-check length for the most reliable results, but you can run as many checks as you like.
How accurate is the plagiarism checker?
It uses semantic matching to surface duplicated and closely paraphrased passages, but like any checker it's a screening aid, not proof. Review the highlighted matches and use your judgement.
Can I use these tools for schoolwork or client work?
Yes. Because your text never leaves your device, the tools are well suited to essays, drafts and confidential documents. Always follow the academic-integrity or editorial policies that apply to you.
What's the difference between these tools and the AI detector?
The tools help you write, count, compare and clean text; the AI detector estimates whether writing was produced by AI and shows the evidence. Use them together.