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Absolutoolはライター、学生、開発者、テキストを扱うすべての人向けに、包括的な無料テキスト操作ツールスイートを提供しています。エッセイの制限のために単語と文字をカウントし、プログラミング用にケースを変換し、ドキュメントを比較して違いを見つけ、機密メッセージを暗号化したり、デザイン用のプレースホルダーテキストを生成したりできます。

すべてのテキストツールは100%ブラウザ内で動作します · テキストがサーバーに送信されることは決してありません。これにより、機密文書、パスワード、機密性の高いコンテンツに対して安全です。

Text Is Everywhere

Text is the most-touched data type in modern work. A copywriter polishing a 200-word product description, a developer reading log files, a paralegal proofreading a contract, a student trimming an essay to a word limit, a developer hunting a regex bug: all of them are doing text manipulation, and most of them switch between several tools to get one task done. The text utilities in this category aim to put each common operation behind a single page that loads in under a second. The interfaces are intentionally minimal: paste in, see result, copy out. No accounts, no ads in the way, no upload step.

The tools fall into recognisable groups: counters (characters, words, lines, paragraphs, reading time, byte size), case conversions (upper, lower, title, camel, snake, kebab, and the dozen others programming uses), comparison (diff checker with side-by-side and inline modes), writing aids (readability scorer that runs Flesch and Flesch-Kincaid grading, markdown editor and previewer with live render, slides generator), generators (lorem ipsum in five flavors, placeholder data, a resume builder), decorative (ASCII art, glitch text, emoji picker), and encodings (Morse code, binary-text, ASCII table reference, Roman numerals, number-to-words).

Counting Text Is Harder Than It Looks

"Character count" sounds unambiguous but isn't. A heart emoji ❤️ is one visible character but is actually three Unicode code points joined together (the heart, a variation selector, and a zero-width joiner are common combinations). A Chinese character like 漢 is one code point but takes two or three bytes in UTF-8. A waving-hand emoji with a specific skin tone is even longer underneath. The Character Counter and Byte Counter tools on this site give you both numbers, the visible grapheme count (what humans see) and the underlying byte count (what storage and transmission care about), so you can choose the right one for the limit you're working against.

Word counting has its own ambiguities. Hyphenated words ("state-of-the-art") count differently depending on whether you treat them as one word or three. Initialisms ("FBI" versus "F.B.I.") also vary. The Word Counter on this site follows the Microsoft Word convention used by most academic style guides, which treats any continuous run of letters and digits as one word and splits on whitespace and most punctuation. For platforms with a specific word-counting rule (Twitter's character limit, Substack's word limit display) you may see numbers that differ by a few percent from any of the tools. The point is to be in the ballpark before submitting, not to match every platform's exact algorithm.

Markdown and the Writing Stack

Markdown has won as the lingua franca of structured plain text. The text-to-HTML converter on this site, the Markdown Editor, the Markdown Previewer, the Markdown Table generator, and the Markdown Slides converter all use the same CommonMark engine internally, which means the output is consistent across them. GitHub, Reddit, Stack Overflow, Discord, Notion, Obsidian, and most documentation sites understand the same subset of Markdown, so what works in our preview works there. The editor supports keyboard shortcuts (Cmd/Ctrl+B for bold, Cmd/Ctrl+I for italic, Cmd/Ctrl+K for a link) and a split-pane live preview that updates as you type.

The Markdown Slides tool takes the simple convention of "--- on its own line starts a new slide" and renders a clean reveal.js-style presentation you can navigate with arrow keys. Useful for stand-up demos, lightning talks, and training materials where Keynote or PowerPoint would be overkill. The Online Notepad auto-saves to localStorage and supports up to five named tabs, so it's a fast scratchpad you can return to without losing your place. The Readability Scorer applies Flesch Reading Ease and Flesch-Kincaid Grade Level to your text and flags sentences that are too long or use too many syllables, useful for keeping public-facing copy accessible.

Why Privacy Matters for Text

The text you process through these tools is often confidential: drafts of email apologies, employee performance reviews, code with company-specific business logic, legal filings before they're public, account credentials, recovery phrases, personal journals, medical history paragraphs. Most online text utilities log the content for "analytics" or "improvement", which means a copy lives on someone else's server indefinitely. The text tools on this site process input in your browser tab without sending it anywhere. You can verify by opening the developer tools' Network tab and watching for outbound requests as you paste, the only requests you'll see are for site assets and Google Analytics, never the text you typed.

The same principle applies to the writing aids. The Readability Scorer runs the Flesch formulas in your browser, no server round-trip. The Diff Checker compares two texts locally and produces the side-by-side or inline view without uploading either version. The Markdown Editor's draft autosaves to localStorage on your device, accessible only to your browser. The Online Notepad follows the same pattern. None of these tools require sign-in, account creation, or email confirmation. The trade-off is that you can't access your drafts from a different device unless you copy them yourself, the same trade-off that protects you from leaks if the service is breached.

Frequently Asked Questions