About PrintReadyKit

PrintReadyKit is a small collection of free, browser-based tools for everyday print preparation: image resolution analysis, printer scale calibration, paper-size and paper-weight conversion, poster tiling and envelope matching, alongside 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 made by Michael Savvidis, in Greece. It is a one-person project, built and maintained independently, with no company or sponsor behind it. AI tools assist with drafting and development, which the editorial policy sets out in full; every technical value is verified against the published standard before it goes live, and nothing is published as raw generated text. 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published standards — ISO 216 for A-series paper and the C-series envelope designations of ISO 269 (a standard since withdrawn by ISO, though its sizes remain the commercial norm) — and cross-checked against the file-preparation requirements that commercial printers actually publish.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 Michael, who reads every message and fixes what is wrong.

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.

The standard itself is ISO 216:2007, and it is not free to read — ISO sells it. What can be checked without buying it is the scope and the definitions, published on ISO’s Online Browsing Platform. So rather than cite a document we cannot show you, every figure on this site is derived from the two rules above and checked against the arithmetic: the build fails if any size in the tools disagrees with the dataset by more than a hundredth of a millimetre, and fails again if the published JSON and CSV disagree with each other. That is a weaker claim than “taken from the standard” and a more honest one.

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 the tools are built

Every tool runs entirely in your browser. No file is uploaded; no input is sent to a server. All of it is deterministic mathematics running on your own device, which is also why the site loads quickly: no calculation ever waits on a server round-trip. What runs depends on the kind of tool:

• Calculators (paper size, DPI, paper weight, scale, envelope finder) do arithmetic and show a result. No file is produced.
• Generators (rulers, graph and lined paper, label sheets, business cards, envelopes, calendars, tickets, place cards) build vector geometry from your settings and hand you a PDF, and for most of them an SVG.
• Analysers (image print quality) read the size and embedded resolution from the first kilobytes of an image you choose. The image is read locally and forgotten when you close the page.
• Processors (the poster splitter, the passport photo maker, the photo calendar) decode your image or PDF and build a new PDF from it on your own machine. This is why very large files are refused rather than attempted: the work has nowhere else to go.
• Measurement (the calibration test, the online ruler, the ring sizer) prints or shows known references and turns what you measure into a correction. The arithmetic is trivial; the value is in the references being exact.

PDF and SVG are not interchangeable. A PDF carries a fixed page size, so a ruler or a calibration sheet arrives at true scale in any print dialog, which is what matters when the measurement is the point. An SVG is a vector drawing in real-world units that opens in any browser or design tool and stays editable, which is what you want from a template you intend to build on. Either way every line is placed at its physical position in millimetres, and the same settings always give the same file, byte for byte.

A business card template, for example, is four rectangles (bleed, trim, safe area and the crop marks) computed from three numbers: width, height and bleed. A label sheet combines rows, columns, label size, page margins and gaps into a grid, and a check refuses any combination that would push a label off the page. Label presets that match a commercial sheet are named by the Avery numbers they match, checked against published sheet layouts; the site is not affiliated with Avery, and the sheet in your hand is always worth measuring before a full run.

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.