Free marketing tools Content and copy
Small tools for writing and editing web pages, in English and Chinese.
Word counts, readability and text clean-up for people who write.
Word counter
Words, characters, sentences, paragraphs and reading time for any text, including Chinese, Japanese and Korean.
- Characters with and without spaces
- CJK characters counted one by one
- Reading time shown as min:sec
Case converter
Convert text to UPPER, lower, Title Case or Sentence case, or to snake_case, camelCase and other code naming styles.
- Nine formats from one input
- Converts line by line
- Copy any result with one click
Keyword density checker
Top words and 2- and 3-word phrases with counts and density, plus where your target keyword appears. Handles English and Chinese.
- 1-, 2- and 3-word phrases
- Target keywords marked in the text
- Flags stuffing patterns, not a magic %
Readability checker
Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau and ARI, with every long sentence marked. Chinese gets its own indicators.
- Six English formulas, checked against textstat
- Long sentences highlighted one by one
- Chinese: sentence length, common-character coverage
Character counter by platform
Check one piece of copy against the official limits of X, Threads, Instagram, YouTube, App Store, Google Play, Google Ads and more.
- Each platform counted its own way
- Only limits the platform documents
- X weighted count per twitter-text
Markdown to HTML converter
Markdown to HTML with a live preview, or HTML back to clean Markdown. Flags syntax that will not render.
- Both directions, live preview
- Line-by-line syntax check
- Same rules as the TapCub blog
Table converter
Paste cells from Excel or Google Sheets, CSV, a Markdown or HTML table, or JSON, and get Markdown, HTML, JSON or CSV.
- Excel and Google Sheets paste
- Aligned Markdown tables
- Merged cells and ragged rows flagged
Text cleaner
Remove duplicate lines, blank lines, extra spaces and line breaks, sort, add a prefix or suffix, all in one pass.
- Case-insensitive de-duplication
- Unwrap lines, keep paragraphs
- Runs locally, download the result
Find and replace
Replace many terms in one go, with regex, hit counts for every rule and a preview of each changed line.
- Many rules, paste from a sheet
- Sequential or simultaneous
- JavaScript regex syntax
Word frequency counter
Count every word, character or phrase in a text, filter stop words, and export the full frequency table as CSV.
- Full table with share and cumulative share
- Stop words on / off, plus your own list
- Chinese and English, CSV export
Headline analyzer
Check where a headline gets cut off in Google or Baidu, where the keyword sits, and whether it repeats words or exaggerates.
- Pixel-width truncation
- Compare several headlines
- Every check cites its source
China Advertising Law checker
Scan Chinese ad copy for absolute claims and industry-restricted terms, with the article behind each one and a suggested fix.
- Art. 9 and the 2023 SAMR guideline
- Medical, cosmetics, food, education, finance
- Highlights + suggested rewrite
Questions about the tools
Still have a question?
Chat with the team behind TapCub — we usually reply within a few hours on business days.
Do I need a TapCub account to use them?
No. The tools are public pages. An account only matters when you want the same numbers computed from your live traffic instead of typed in.
Is anything I type sent to TapCub?
No. Almost every tool runs entirely in your browser. A few lookup tools (DNS, WHOIS, page speed) send only the domain or URL you enter, from your browser straight to a public service such as Cloudflare DNS, the domain registry or Google PageSpeed, and only when you press the button; each of those pages says where the request goes. We record that a tool page was viewed and used, like any other page — never the values.
Are the tools kept up to date?
Yes. Every tool page lists its version, an update history and the date each data source was last checked. Data such as crawler rules, public holidays and platform limits is re-checked on a schedule, and all tool updates are listed in one place.
Can I embed or link to a tool?
Linking is welcome. The pages have stable URLs under /tools. We do not offer an embed, but the formulas are documented on each page so you can reproduce them.
Why do my numbers differ from my analytics tool?
Usually the definition, not the arithmetic: who counts as a visitor, which event converts, and whether bots were removed first. Each tool lists the definition it assumes. See why UV never matches.
Will there be more tools?
When a question comes up often in support we turn it into a page. Suggestions go to contact.