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Turn your customs notes into HS code flashcards

Upload a PDF, slides, notes or a photo of a tariff page, and get flashcards you can review with spaced repetition.

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Why build your own HS code flash cards

Ready-made printable HS code flashcards exist, but a generic sheet rarely matches the tariff schedule, chapter notes or classification rules your course or broker actually uses. Starting from your own material keeps the cards tied to the codes you will be tested on or asked to apply.

Flashcards generated from the exact tariff document or notes you upload
Chapter, heading and subheading cards that follow the Harmonized System structure
Spaced repetition so difficult codes return before you forget them
Quizzes with explanations to practice applying the classification rules

Example HS code flashcards for customs classification

What do the first six digits of an HS code identify?The international subheading, which is the same in every country that uses the Harmonized System. Countries add digits after that for national tariff lines.

What does the first two digits of an HS code represent?The HS chapter, such as 84 for nuclear reactors, boilers, machinery and mechanical appliances.

What is the difference between an HS heading and a subheading?A heading is the first four digits. A subheading adds two more digits to make six.

What are Section and Chapter Notes in the Harmonized System?Legal text that defines what each section or chapter covers and can override the heading wording when classifying a product.

What is General Rule 1 for HS classification?Classification is determined first by the wording of the headings and any relative section or chapter notes, before applying the other general rules.

Generate the full set

Built from your material

Flashcards come from the tariff schedule, classification notes or lecture slides you upload, not a generic list.

Spaced repetition

Cards you miss come back sooner, so chapter and heading numbers stick before a customs exam or a shift on the job.

Quizzes with explanations

Switch to multiple choice or short answer questions that explain why a code belongs under a given heading.

How it works

Upload your source

Add a PDF, DOCX, PPTX, plain text notes, or a photo of a page. Photos are read with text recognition.

Generate your cards

DeckOwl turns the material into question and answer flashcards you can edit before studying.

Study on a schedule

Review in the browser on the free plan, or export to Anki or CSV with a Plus plan.

The Harmonized System is layered: two digits give the chapter, four digits the heading, and six digits the international subheading. Countries add more digits for national tariff lines, so cards should reflect the version you work with. Generate cards from that exact document and check the digits against it.

A practical routine is to start with chapters you handle most, review headings within them, and then add the Section and Chapter Notes that decide edge cases. Spaced repetition handles the rest so the numbers stay familiar.

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Frequently asked questions

What do the first six digits of an HS code mean?

The first six digits form the international subheading under the Harmonized System, so they match across countries. Countries add further digits after those six for their own national tariff lines.

How should I study HS codes effectively?

Start with the two-digit chapters you use most, then learn the four-digit headings within them. Review cards on a spaced schedule and practice applying the classification rules, not only memorizing numbers.

Can I export HS code flashcards to Anki or CSV?

Yes, but exports are a paid feature. The Plus plan at $39/year or $7.99/month includes PDF, DOCX, Anki and CSV export along with unlimited generations.

Is there a free plan to try it first?

Yes. The free plan includes 3 generations per month and studying in the browser, and no credit card is needed to start. Students get 40% off with a school email.

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