ISO and US paper sizes, print pixels at a dpi, sheet fitting, paper weight, envelope fit, typographic units and book signatures.
payments ON MAINNET (real money) · 8 live endpoints
| Endpoint | Price | What it answers |
|---|---|---|
GET /book-signatures | $0.02 | Signatures, press sheets and blank pages needed for a book of N pages at 4, 8, 16 or 32 pages per signature. |
GET /envelope-fit | $0.02 | Which standard envelopes (#10, A2, A7, C5, DL, C6 and more) hold a card or folded sheet, with the margin left over. |
GET /iso-paper | $0.02 | ISO 216 size in mm, inches and points for A0-A10, B0-B10, C0-C10, with area, aspect ratio and the neighbouring sizes. |
GET /paper-fit | $0.02 | How many cards, labels or small sheets fit on a large sheet in a grid, trying both rotations, with margin, gutter and waste. |
GET /paper-weight | $0.02 | Convert paper gsm to US basis weight (bond, text, cover) and weigh a sheet, a ream or a mailing from its size. |
GET /print-pixels | $0.02 | Pixels needed for a print size at a dpi (with bleed), or the largest print size an image supports at a chosen dpi. |
GET /typographic-units | $0.02 | Convert between points, picas, inches, mm, cm, CSS pixels, TeX points, Didot and twips, and show the pica-and-points form. |
GET /us-paper | $0.02 | Letter, Legal, Tabloid, ANSI A-E and Architectural A-E paper sizes in inches, mm and points, with the closest ISO size. |
GET /catalog returns this list as JSON. Activity hub · uptime.
Print and paper arithmetic computed locally from published standards (ISO 216, ANSI/ASME Y14.1, PostScript points), provided as is. Press, printer and paper-mill tolerances vary: always check your printer's own specification and request a proof before a print run. Not a prepress certification. Every paid response carries a disclaimer field.