6 free tools
Writing & Publishing tools built for real work
Local text, publishing and content-quality utilities for writers, editors and digital teams. Every tool is designed to expose its inputs and outputs clearly instead of hiding the logic behind a vague score.
✎Article Broken Link CheckerPaste HTML, Markdown or plain article text to extract HTTP links and check up to 20 public URLs for obvious broken-link responses.→✎Markdown ↔ HTML ConverterConvert common Markdown to HTML or HTML to readable Markdown locally in your browser.→✎Readability CheckerAnalyze words, sentences, estimated syllables, Flesch Reading Ease and Flesch-Kincaid Grade Level for an English draft.→✎Social Post Length CheckerCount characters, words and lines, then compare your draft with an editable platform limit before posting.→✎Text Diff CheckerFind additions, removals and unchanged content with a local line-by-line or word-by-word longest-common-subsequence diff.→✎Title Case / Sentence Case ConverterClean up headings and copy with practical case conversion while preserving short all-caps acronyms where possible.→
Why ToolboxKart Writing & Publishing tools?
Fast interfaces, plain-language explanations, mobile-friendly layouts and no unnecessary account wall for the utilities in this release.
Tool first
The working interface appears before long-form SEO content, so you can finish the task quickly.
Transparent logic
Calculators disclose formulas or assumptions where they matter, and analyzers avoid pretending subjective checks are scientific facts.
Reusable results
Copyable output and clean formatting are included where they improve the workflow.