About PrintReadyKit

PrintReadyKit is a small collection of free, browser-based tools for everyday print preparation: paper-size conversion, DPI and pixel calculations, label-sheet layouts, business-card templates with bleed, graph paper and printable rulers.

The site was built around a simple frustration: every time someone needs to set up a print file, they have to look up the same dimensions, do the same DPI maths, and re-create the same template grid. The tools here exist so you can stop doing that.

What this site is

• A reference for standard paper, envelope and card sizes.
• A set of generators that output print-ready SVG files in real millimetres.
• Short, plain-language guides to bleed, safe area, DPI and related concepts.

What this site is not

• A print shop. The site does not print or ship anything.
• An affiliate site for any specific label or paper brand.
• A replacement for your printer’s own specification sheet — always check it before sending a final file.

Who runs this site

PrintReadyKit is written and maintained by its small editorial team. Nothing here is scraped from other size websites: every dimension table is computed directly from the published standards — ISO 216 for A-series paper and the C-series envelope designations of ISO 269 (a standard since withdrawn by ISO, though its sizes remain the commercial norm) — and cross-checked against the file-preparation requirements that commercial printers actually publish.

In-depth reference pages show a “Reviewed” date. When a value is corrected or a guide is extended, that date is updated. If you spot an error in any table, the contact page reaches a human who will fix it.

Sources & methodology

A-series dimensions follow ISO 216, which anchors the system on two rules: A0 is derived from an area of one square metre, and every sheet keeps a 1 : √2 aspect ratio. Each halving is then rounded to whole millimetres — the reason A0 works out to 999,949 mm² rather than a perfect million, and the reason some adjacent sizes (A4 → A5, A0 → A1) differ from an exact half by up to half a millimetre while others (A3 → A4, A5 → A6) halve perfectly. Where a relationship is exact we say so; where it is nominal we say that too.

Pixel values use the standard conversion px = mm ÷ 25.4 × DPI, rounded to the nearest whole pixel. Envelope pages follow the C-series of ISO 269; the standard itself has been withdrawn by ISO, but its designations (DL, C4–C6) remain what envelope manufacturers sell against, so we document them as the working commercial standard they are.

How it works under the hood

Every tool runs entirely in your browser. No file is uploaded; no input is sent to a server. The dimensions you enter are turned into SVG markup using simple, deterministic mathematics, and the resulting file is offered as a direct download. This is also why the site loads quickly — no calculation ever waits on a server round-trip.

Independence

PrintReadyKit is not affiliated with any label, paper, printer or design-software company. Sizes referenced here come from public standards (ISO 216, ANSI, common postal standards) and from generic conventions used across the printing industry.