All Tools

Analyze raw email headers to trace the delivery route, detect delays between servers, and check SPF, DKIM, and DMARC authentication results.

Extract email addresses from any text, HTML, CSV, or log content instantly with duplicate removal and domain statistics.

Convert clothing sizes between US, UK, EU, JP, and KR standards for men's and women's tops, bottoms, and dresses, with body measurements in cm.

Convert Chinese characters to Pinyin with tone marks or tone numbers. See character-by-character alignment with color-coded tones, and copy the result.

Create professional cover letters from your contact info, job details, and qualifications, with a live preview and PDF, image, or text export.

Interactive Hiragana and Katakana chart with pronunciation audio, example words, and a quiz to master the Japanese kana writing systems.

Scan your email subject and body for spam trigger words, get a spam score, and see exactly which words could send your message to the spam folder.

Track your paid time off balance across vacation, sick, and personal leave. Log entries by date range and see remaining days, accrual, and utilization.

Simulate realistic OS file operations like deleting, copying, or formatting with authentic Windows, macOS, and Linux dialogs. Perfect for harmless pranks.

Design responsive HTML emails with a visual block editor, 33 templates, live desktop and mobile preview, and one-click export for Gmail, Outlook, and marketing platforms.

Create a professional employment offer letter with company details, compensation, benefits, and terms. Choose from six templates and export to PDF.

Watch any Chinese character drawn stroke by stroke, then practice and quiz yourself on the correct stroke order with live feedback.