Yes. The text analysis and parsing engine runs 100% client-side directly in your browser JavaScript environment. Your documents and typed text are never uploaded, logged, or transmitted to any external backend server.

Reading time is calculated using the international standard average silent adult reading speed of 200 words per minute (WPM). Speaking time is estimated using the standard conversational speech rate of 130 WPM. Handwriting time is estimated at 15 WPM based on standard longhand examination speed.

Keyword density measures the percentage frequency of specific words or multi-word phrases relative to total non-stop words. This tool analyzes 1-word tokens as well as 2-word bigrams and 3-word trigrams, filtering out English stop words (like 'the', 'is', 'at') to identify dominant topical themes and prevent SEO keyword stuffing.

The Flesch Reading Ease formula computes a score from 0 to 100 using average sentence length and average syllable count per word: 206.835 - 1.015 * (words / sentences) - 84.6 * (syllables / words). Scores between 90-100 represent very easy reading (5th grade), 60-70 represent standard web copy (8th-9th grade), and 0-30 represent academic college-level literature.

These are established readability formulas: Flesch-Kincaid Grade Level translates text difficulty into US school grades (0-18+). Gunning Fog Index measures years of formal education required by evaluating complex words with 3 or more syllables. The Automated Readability Index (ARI) uses character-per-word ratios for typewriter and digital screen readability assessment.

Character count with spaces measures total length including every letter, number, punctuation mark, space, and tab. Character count without spaces counts only visible glyphs and characters, which is essential for typesetting, academic submissions, and print character limits.

Click the '🎯 Goal' button to set a target word count (e.g. 500 words for a blog post or 2,000 words for an essay) or character count (e.g. 280 for Twitter). The live progress bar shows real-time percentage completion and remaining words or characters with celebration feedback upon goal completion.

You can upload plain text (.txt), Markdown (.md, .markdown), JSON (.json), CSV (.csv), and document files (.doc, .docx). The browser reads the file content locally in memory without transmitting it across the internet.

The tool includes real-time character limit progress bars for major platforms including Twitter/X (280 chars), Google Meta Descriptions (160 chars), Google SERP Titles (60 chars), Instagram Captions (2,200 chars), Instagram Bios (150 chars), LinkedIn Posts (3,000 chars), TikTok Captions (2,200 chars), and YouTube Video Titles (100 chars) with dynamic color warnings when limits are approached or exceeded.

You can export formatted plain-text executive summaries (.txt), structured JSON analysis reports (.json), CSV keyword frequency matrices (.csv), or copy Markdown summary tables. Developers can also open the Developer API Studio (Alt+S) to copy or download ready-to-run lexical analysis code across 7 languages including TypeScript, Python, Go, Rust, Java, PHP, and Bash.

Press Alt+P for DevToys Smart Clipboard Auto-Detect, Alt+D to star/bookmark the tool in favorites, Alt+V to toggle between 2-Column Split Studio and Full-Width Stacked views, Alt+S for the Developer API Studio, Alt+R for a random benchmark sample, Alt+G to toggle the writing goal tracker, Alt+M to copy the Markdown summary table, Alt+K or ? for the Keyboard Shortcuts modal, Alt+1 through Alt+6 for 1-Click Quick Copy formats (Words & Chars, Markdown, JSON, Keywords, Timings, Clean Text), / to focus the text workspace, Ctrl+Enter to copy text, and Esc to clear workspace or close active modals.