Free tools

Small tools that answer one question each. They compute in your browser, so nothing you paste is uploaded, and none of them ask you to create an account.

15 free tools

• Chinese character counter (HSK 2.0)

  Count the characters in a passage and see its HSK 2012 character coverage. For word-level analysis against your own vocabulary, use the HSK Studio word-level analyzer.

  Chinese · Fulin Labs

• Flashcard workload calculator

  See where a spaced repetition habit plateaus in reviews per day, and what it costs in minutes, before committing to a new-card rate.

  Flashcards · Fulin Labs

• HSK vocabulary size calculator

  Compare a vocabulary count you supply with the HSK Studio dictionary’s cumulative levels. Not a knowledge test or official syllabus count.

  Chinese · HSK Studio

• Spaced repetition interval calculator

  Choose review grades and see one card’s intervals in Fulin Flashcard’s scheduler. Not an Anki or FSRS prediction.

  Flashcards · Fulin Flashcard

• UTM checker

  Check a campaign URL for missing or inconsistent UTM parameters before sharing it.

  Links · ShortLink

• YouTube Shorts title and description checker

  Check the 100-character title limit, 5,000-byte description limit and 60-hashtag threshold.

  Video · SchedulePost

• Chinese text analyzer

  Paste Chinese text and get every word back, frequency-ranked, with the ones already in your review deck marked off. Exports to Anki, Pleco or CSV.

  Chinese · HSK Studio

• HSK level checker

  The lowest HSK 3.0 level that covers 90% of a text, plus the cumulative coverage curve for levels 1-9 behind it.

  Chinese · HSK Studio

• Chinese to pinyin converter

  Pinyin read off whole words rather than single characters, so 银行 is yínháng, with 一 and 不 tone sandhi applied across word boundaries.

  Chinese · HSK Studio

• Character frequency counter

  Every character in a text ranked by frequency, with the running total that shows how few of them carry most of the page.

  Chinese · HSK Studio

• QR code generator

  Turn any link into a QR code and download it as PNG or SVG.

  Links · ShortLink

• UTM builder

  Build campaign URLs whose parameters attribute correctly in analytics.

  Links · ShortLink

• Best time to post

  Get a simple posting window for each day of the week, per platform.

  Video · SchedulePost

• Caption character checker

  Compare a caption against the character limit of each platform before you post it.

  Video · SchedulePost

• Video aspect ratio checker

  Check a video's dimensions against what each platform accepts before you upload.

  Video · SchedulePost

The data behind the two tools hosted on this site is published for reuse: open datasets (CC BY 4.0).