Spell Checker — Free Online Tool
Check spelling & grammar in your text with suggestions. · No signup · Works on mobile
This tool sends data securely over HTTPS to a processing API and nothing is stored after processing. See the FAQ below for details.
How to use the spell checker
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Paste or type your text (up to 20,000 characters per check).
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Click Check Text — mistakes are underlined with colored highlights.
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Click any highlight to see suggestions and apply a fix instantly.
What does this tool do?
This free online spell checker finds spelling mistakes, grammar slips, and style issues in your text and suggests corrections you can apply with one click. Paste up to 20,000 characters, hit Check, and errors are highlighted inline with explanations — powered by the open-source LanguageTool engine.
How does the spell checker work?
Your text is checked by the LanguageTool open-source engine, which combines a dictionary lookup with 5,000+ grammar and style rules for English. Unlike pure spellcheckers, it catches real-word errors like "their/there" and "affect/effect" from sentence context.
Frequently Asked Questions
What kinds of errors can this checker catch?
Three layers: spelling (misspelled words against a dictionary), grammar (subject-verb agreement, wrong tense, missing articles), and confused words ("their" vs "there", "its" vs "it's") detected from context. It flags roughly the same categories as premium tools' free tiers.
Is my text sent to a server for checking?
Yes — spell checking requires a large language rule engine, so your text is sent securely (HTTPS) to the LanguageTool API for analysis and is not stored after the check completes, per their privacy policy. For highly confidential documents, use our fully offline tools like the word counter.
Is the spell checker really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. You don't need to create an account or enter an email address. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Is my data private when using the spell checker?
Completely. The spell checker runs entirely in your browser using JavaScript — nothing you type or upload is sent to our servers. When you close the tab, your data is gone. This makes it safe for confidential documents, financial figures, and personal information.
Does the spell checker work on mobile phones?
Yes. The spell checker is built mobile-first and works on any phone or tablet with a modern browser — iPhone (Safari), Android (Chrome), and everything in between. The layout adapts to small screens, so buttons and inputs stay easy to tap on a 375px-wide display.
Do I need to install anything to use the spell checker?
No. The spell checker works directly in your web browser — no downloads, no extensions, no signup. Just open the page, use the tool, and get your result instantly. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.