ToolNest

Spelling Checker

Catch typos instantly using your browser's dictionary — free, private.

Spelling Checker

Misspelled words get underlined using your browser's dictionary — free, private.

✨ AI Boost (Optional) — use your own free Gemini key

Paste your own free Google Gemini API key once — it works across all AI-enabled ToolNest tools, stays only in this browser, never uploaded. Goes beyond spelling to check grammar and style too.

Catching Typos Before Someone Else Does

A single misspelled word in an otherwise polished email or cover letter can undercut the whole impression, and it's exactly the kind of mistake that's hard to catch in your own writing since you already know what you meant to type. This tool underlines misspelled words as you write, using your browser's own built-in dictionary engine.

How the Checking Actually Works

Rather than shipping a separate spelling dictionary or sending your text to a server for analysis, this tool taps directly into the spellcheck engine already built into your browser (Chrome, Firefox, Safari, and Edge all ship one) — the same underlying system that underlines typos in any text field across the web. That means checking happens instantly, with zero network delay, and respects whatever custom dictionary words you've already added at the browser level.

A Worked Example

Pasting a 400-word cover letter draft into the tool immediately underlines any genuinely misspelled words in red, the same visual treatment you'd see typing directly into a Gmail compose window — catching a word like "recieve" instead of "receive" or "occured" instead of "occurred" before the letter goes out, rather than relying on a final read-through where familiarity with your own writing makes typos easy to skim past.

Where This Gets Used

Job seekers checking a resume or cover letter one more time before submitting. Students proofreading an essay draft pasted from a notes app that doesn't have spellcheck built in. Non-native English speakers double-checking a professional email before sending. Anyone drafting in a plain-text editor or notes app that skips spellcheck entirely, then wanting a check before moving the text somewhere more visible.

What Browser Spellcheck Catches and Misses

It reliably flags genuinely misspelled words against its dictionary, but like all spellcheck engines, it can't catch a correctly spelled word used incorrectly — "their" instead of "there," or "affect" instead of "effect" — since both are valid words, just wrong in context. It's a typo catcher, not a grammar or usage checker, and pairing it with a careful read-through for context errors still matters.

Dictionary Differences to Expect

Browser spellcheck dictionaries sometimes flag correctly spelled proper nouns, technical terms, or names as errors simply because they're not in the standard dictionary — that's expected and not a bug, since no general dictionary contains every person's name or every industry-specific term. Most browsers let you add words to a personal dictionary at the browser level, which this tool will then respect.

Nothing Sent to a Server

Because checking runs through your browser's built-in spellcheck engine rather than a remote service, your text — including anything personal or unpublished — is never transmitted anywhere during the check.

Comparing This to a Dedicated Grammar App

Standalone grammar-and-style checkers like Grammarly analyze sentence structure and usage in addition to spelling, which this tool doesn't attempt — it's intentionally narrower, focused purely on catching genuine misspellings fast without an account, upload, or ongoing subscription, which is the right tool for a quick typo pass rather than a full stylistic edit.

A Second Example

Someone drafting a public social media post pastes the text in for a final typo check before publishing — catching "definately" before it goes live is a small thing, but a visible spelling error in a public post is the kind of detail that's disproportionately noticed and remembered by readers relative to how much effort it takes to avoid.

Why does the tool flag a word I know is spelled correctly?

This usually happens with proper nouns, brand names, or technical terms not included in the standard dictionary — add the word to your browser's personal dictionary to stop it from being flagged going forward.

Does this catch grammar mistakes too, not just spelling?

No — it specifically checks spelling against the dictionary; grammar and word-usage errors like "their" vs. "there" require a separate grammar-focused tool.

Can I change which language dictionary is used?

The tool follows whatever spellcheck language is set in your browser's own settings, so changing your browser's language preference changes which dictionary is applied here too.

Why does the underlining look different across browsers?

Each browser renders its native spellcheck underline slightly differently (wavy red lines, dotted lines, etc.) since this uses each browser's own built-in visual style rather than a custom one.

Is there a limit to how much text I can check at once?

No fixed limit — since checking relies on your browser's own engine rather than a server call, longer text simply takes the browser slightly longer to process the check.