Disclaimer

Color conversions here are computed correctly, but what you see depends on your display, its calibration and color profile, your operating system’s color management, your browser, and the light in the room. Two people looking at the same hex value are routinely seeing different colors, and neither screen is necessarily showing the one that will be produced.

Screen-to-print conversion is approximate by nature. RGB and OKLCH describe emitted light with a wide gamut; process ink on paper cannot reproduce all of it, and any conversion to CMYK involves choices about rendering intent, ink limits, paper stock and press condition that this site knows nothing about. Treat any printed-color value here as a starting point for a conversation with your printer, never as a specification. For brand-critical color, work from a physical swatch book and a press proof.

The contrast checker computes WCAG ratios to the published formula, and those numbers are reliable. What they cannot tell you is whether your interface is accessible. Conformance depends on real content at real sizes against real backgrounds — including text over images and gradients, focus indicators, states like hover and disabled, non-text contrast for controls and graphics, and how the whole thing behaves at zoom and under a screen reader.

Passing a ratio check on a pair of hex values is one input to that, not a conclusion. Nothing here certifies conformance with WCAG, the ADA, Section 508, EN 301 549 or any other standard, and no output should be represented as evidence of compliance. Where conformance matters legally or contractually, have an accessibility specialist audit the real product and test with assistive technology and with disabled users.

The color blindness simulator approximates common forms of color vision deficiency using standard models. It is an illustration to design against, not a medical or diagnostic tool, and it does not represent how any particular person sees.

Spine width, imposition, halftone, copyfitting and paper size calculations return exact arithmetic from the values you enter. They do not know your printer’s actual paper caliper, their bulk or PPI figure, their binding method and its allowances, their trimming tolerances, their press sheet size, their grippers and gutters, or their preferred screen ruling. All of those change the answer, and they vary between printers and between paper batches.

A wrong spine width or a wrong imposition is not a small error — it scraps the run, and the cost falls on whoever supplied the file. Confirm every specification with your printer before output, send them your file for preflight, and approve a physical proof before the press run. Where they give you a template or a figure, theirs wins over anything calculated here.

Nothing on Trim Marks constitutes professional design, prepress, accessibility, legal or compliance advice, and using these tools does not create a professional relationship. We have not seen your project, your files, your brand requirements or your legal obligations.

The formulas are implemented carefully, but no guarantee is made that any tool is accurate, current, complete or fit for your purpose. The site is provided “as is” and “as available”, without warranties of any kind, express or implied, including merchantability, fitness for a particular purpose and non-infringement.

Everything runs in your browser and nothing is saved. If you produce a palette or a specification you want to keep, copy it out — closing the page loses it, and we cannot recover it.

To the fullest extent permitted by law, Trim Marks and its operator accept no liability for any loss or damage arising from use of, or reliance on, this site — including without limitation reprint or rework costs, scrapped print runs, missed deadlines, rejected accessibility audits, regulatory penalties, color mismatch, lost profits or business interruption, whether direct, indirect, incidental, consequential or otherwise.

You are responsible for verifying every specification before you rely on it. Some jurisdictions do not allow certain exclusions of liability, so parts of this section may not apply to you.

This site carries advertising and may link to external resources. Advertisements are served by third parties and are not endorsements — we do not select, vet or vouch for what is advertised. Linked sites are governed by their own terms and privacy practices.

How advertising affects your data is covered separately in the privacy policy.

Tools are added and revised regularly, and this page may change with them. The date at the top reflects the last substantive revision. Continued use of the site after a change means you accept the current version.