Static-first micro-tools

Fast browser tools that stay useful on mobile

500.lv focuses on practical micro-tools that solve one task quickly without account walls or heavy scripts.

The first release covers developer, text, marketing, color, image, and time conversion workflows.

Featured tools

image-tools

Paste SVG markup or upload an SVG file, preview it, and export a PNG directly in the browser.

developer-tools

Format, minify, and validate JSON in the browser with clear feedback and one-click copy.

developer-tools

Encode plain text to Base64 or decode Base64 back to text with quick copy actions.

text-tools

Count words, characters, spaces, lines, and paragraphs with a live update as you type.

text-tools

Compare two text blocks in line mode or word mode with whitespace and case toggles.

color-tools

Convert hex colors to RGB or RGBA and see a live swatch while you work.

marketing-tools

Compare two variants using visitors and conversions to estimate uplift, z-score, p-value, and significance.

marketing-tools

Estimate the required sample size per variant from baseline rate, minimum detectable effect, confidence, and power.

math-converters

Convert Unix seconds, Unix milliseconds, and readable datetimes with UTC and local time toggles.

marketing-tools

Compare three or more variants by visitors and conversions, review rates, and identify the current leader.