jarvisbox

jarvisbox /

Design tools

10 browser-based design and accessibility tools — check color contrast, simulate color blindness, preview font pairs, generate CSS code, optimize SVG, create favicons, resize icons, and more. No signup, no cloud, nothing leaves your device.

100% client-side · no uploads · no telemetry

Design Tools

Why browser-only design tools?

Design files, brand assets, and client icons are valuable intellectual property. Uploading them to a third-party service creates unnecessary risk. Every tool on this page runs entirely in your browser — paste freely, audit safely, share nothing.

From accessibility checks (color blindness simulation, WCAG contrast ratios) to code generation (CSS shadows, clip paths) to asset optimization (SVG minification, emoji favicons, icon resizing), every tool is built for the moments designers and developers need quick, private answers.

よくある質問

Do these tools upload my files anywhere?
No. Every design tool on this page runs entirely in your browser. Your images, SVG files, and color choices never leave your device — not even temporarily.
What is WCAG color contrast?
WCAG (Web Content Accessibility Guidelines) defines contrast ratio thresholds for readable text. AA level requires a 4.5:1 ratio for normal text and 3:1 for large text. AAA level requires 7:1 and 4.5:1 respectively.
Can I use generated favicons commercially?
Yes. The Emoji Favicon Generator renders standard system emoji onto a canvas in your browser. The resulting PNG files are yours to use freely.
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