B5 pages with Japanese trim marks
B5 is the standard size for manga fan books. Finished it is 182 x 257 mm; with bleed, 188 x 263 mm; with room for trim marks as well, 208 x 283 mm.
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The sheet size once marks are on
Ticking the marks option adds 10 mm of paper outside the 3 mm bleed on every side: 182 + 6 + 20 = 208 mm by 257 + 6 + 20 = 283 mm. That margin exists only to carry the corner and centre marks and disappears when the job is trimmed. Printers that do not want marks get the plain 188 x 263 mm file instead. Bleed, trim marks and paper thickness differ from printer to printer — always check the spec sheet of the shop you are submitting to.
How it maps to Japanese manga board
Pre-printed B5 manga board has a 182 x 257 mm trim and an inner frame of roughly 150 x 220 mm. Art may run past the inner frame, but dialogue and sound effects belong inside it, because anything outside can be lost to the cut. Digital pages should carry the same guide.
What the doubled lines tell the printer
The inner line is the trim, the outer line is the edge of the bleed, and the 3 mm gap between them lets the shop confirm the bleed at a glance. The centre marks on each edge are registration targets for aligning front against back and for folding.
Frequently asked questions
Are trim marks mandatory?
Rarely, for doujinshi work — most Japanese small-press printers ask for bleed only, so a plain 188 x 263 mm file is right. Commercial and general-purpose print shops are more likely to want the marks. Check the order form.
What colour are the marks drawn in?
Dark grey hairlines. Strict prepress uses registration colour, 100% of every plate, but the marks live in an area that is cut away, so in practice this is fine.
Which is bigger, B5 or A4?
A4, at 210 x 297 mm, is larger than JIS B5 at 182 x 257 mm. Printing a B5 book on A4 stock leaves a margin all round.