Choosing Japanese Dummy Text

You fill a mockup with lorem ipsum, swap in the real Japanese copy, and suddenly every line wraps differently. This article explains what actually differs, what Japanese dummy text reproduces, and how to choose per use case.

1. What lorem ipsum is for

lorem ipsum is pseudo-Latin placeholder text used in print and design. Because it cannot be read for meaning, reviewers look at the layout instead of the copy. That property is still useful. The problem lies in its linguistic behaviour.

2. What breaks in Japanese

lorem ipsum comes from a language that separates words with spaces. Japanese does not. Four consequences follow.

• Line-break positions: Latin text normally breaks only at word boundaries, leaving ragged ends. Japanese can break between almost any two characters, so lines fill nearly to the edge. The same box looks different at the right margin.
• Characters per line: most Japanese characters occupy one full-width cell, so width divided by cell size gives the count. Latin glyphs vary in width. Something that fits in exactly three lines of lorem ipsum can become two or four in Japanese.
• Visual density: Japanese mixes kanji, hiragana and katakana, and dense kanji runs read darker on the page. lorem ipsum is uniform, so the visual weight of the page shifts after the swap.
• Line-breaking rules: Japanese typesetting forbids certain characters at the start or end of a line, such as leading punctuation or closing brackets. These rules only fire with real Japanese text, and they move the wrap points.

lorem ipsum reproduces only "this area is filled with text". Whether the layout survives Japanese can only be checked with Japanese.

3. What good Japanese dummy text needs

1. It must not be readable as meaning. Readable copy turns a layout review into a copywriting discussion, and it gets shipped by accident.
2. The character-type mix should resemble real writing. All-kanji or all-hiragana dummy text has the wrong density.
3. The length must be controllable. Trimming an over-long sample by hand changes the line count depending on where you cut.

4. Choosing per use case

• Layout review (mockups, markup): use Japanese dummy text at the realistic length for headings, lead text and body separately.
• Estimating length (input fields, summaries, meta description): this is counting, not filling. Decide first how full-width, half-width and newlines are counted.
• Loading into a database or API: boundary values matter, not prose. Generate exactly the limit, the limit plus one, an empty string and a newline-only value.
• Screenshots and documents: the priority is avoiding real names, addresses, phone numbers and companies. Use generated fictional values.

5. Common failures

• Carrying English placeholder text into implementation. Every wrapping problem appears at once when the real copy lands. Swap early.
• Dummy text that is shorter than reality. Short samples always fit. Always test the longest plausible case as well.
• Placeholder text shipped to production. Obviously fake strings can be found by search before release; readable copy cannot.
• Plausible personal data as dummy values. The rule against real values applies to names, addresses, emails and phone numbers alike.

Summary

lorem ipsum still works for hiding meaning, but it cannot validate Japanese layout, because line breaks, characters per line, density and line-breaking rules all differ. Use Japanese dummy text wherever Japanese will appear.

Tools: Japanese dummy text generator, Lorem Ipsum generator, character counter, name generator, address generator and company name generator. Related reading: What is Lorem Ipsum, character count and encoding, and why test data should avoid real values.