{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-06-13T19:02:26.117Z","discovery":{"catalog":"https://toolsly.tools/tools.json","llmsTxt":"https://toolsly.tools/llms.txt","sitemap":"https://toolsly.tools/sitemap.xml"},"relatedTools":[{"slug":"type-scale-generator","name":"Type Scale Generator","url":"https://toolsly.tools/type-scale-generator"},{"slug":"chmod-calculator","name":"Chmod Calculator","url":"https://toolsly.tools/chmod-calculator"},{"slug":"line-height-calculator","name":"Line Height Calculator","url":"https://toolsly.tools/line-height-calculator"},{"slug":"css-minifier","name":"CSS Minifier","url":"https://toolsly.tools/css-minifier"},{"slug":"html-minifier","name":"HTML Minifier","url":"https://toolsly.tools/html-minifier"},{"slug":"svg-minifier","name":"SVG Minifier","url":"https://toolsly.tools/svg-minifier"},{"slug":"htaccess-to-nginx","name":"Htaccess to Nginx Converter","url":"https://toolsly.tools/htaccess-to-nginx"},{"slug":"json-validator","name":"JSON Validator & Formatter","url":"https://toolsly.tools/json-validator"}],"kind":"utility","slug":"px-to-rem","name":"PX to REM Converter","description":"Convert between px, rem and em based on a root font size — instant CSS-ready values, in-browser.","longDescription":"Convert any CSS length between pixels, rem and em. Enter a value, pick its unit, and the tool computes all three equivalents using your chosen base (root) font size — 16px by default, matching every browser's default. rem is measured against the root font size; em is computed with the same base here for convenience. A ready-to-paste CSS snippet like `1.5rem /* 24px */` is generated so you can drop it straight into a stylesheet. Adjust the precision to control decimal places. Everything runs locally in your browser — no upload, no tracking.","category":"dev","categoryName":"Dev","keywords":["px to rem","rem to px","px to em","em to px","px rem converter","pixel to rem converter","rem calculator","css unit converter","px to rem calculator","convert px to rem online","rem em px converter","font size converter","16px to rem","css rem em","responsive font size converter"],"badge":"Converter","url":"https://toolsly.tools/px-to-rem","inputs":[{"type":"number","key":"value","label":"Value","defaultValue":16,"step":0.1,"help":"The length to convert."},{"type":"select","key":"unit","label":"Unit","choices":[{"value":"px","label":"px (pixels)"},{"value":"rem","label":"rem (root em)"},{"value":"em","label":"em"}],"defaultValue":"px"},{"type":"number","key":"baseFontSize","label":"Base font size (px)","defaultValue":16,"min":1,"max":100,"step":1,"help":"Root font size used for rem/em. Browsers default to 16px."},{"type":"number","key":"precision","label":"Precision (decimals)","defaultValue":4,"min":0,"max":8,"step":1}],"outputs":[{"key":"px","label":"Pixels (px)","monospace":true},{"key":"rem","label":"REM (rem)","monospace":true},{"key":"em","label":"EM (em)","monospace":true},{"key":"css","label":"CSS snippet","monospace":true}],"invocation":{"webUi":"https://toolsly.tools/px-to-rem","api":null,"notes":"Currently invoked via the web UI at `webUi`. Inputs are form fields; outputs are structured text values. A remote MCP/REST API is planned."}}