Converts Mbps, Gbps, Kbps into MB/s, GB/s, KB/s on webpages (optimized for speedtest.net, fast.com, ISP offers, etc.)
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// ==UserScript==
// @name Bandwidth Unit Converter (bits → bytes)
// @namespace spotlightforbugs.scripts.bandwidth
// @version 1.4
// @description Converts Mbps, Gbps, Kbps into MB/s, GB/s, KB/s on webpages (optimized for speedtest.net, fast.com, ISP offers, etc.)
// @author SpotlightForBugs
// @license MIT
// @match *://*/*
// @grant none
// ==/UserScript==
(function () {
"use strict";
const conversions = {
Kbps: { factor: 1 / 8, unit: "KB/s" },
Mbps: { factor: 1 / 8, unit: "MB/s" },
Gbps: { factor: 1 / 8, unit: "GB/s" },
Tbps: { factor: 1 / 8, unit: "TB/s" },
"kbit/s": { factor: 1 / 8, unit: "KB/s" },
"Mbit/s": { factor: 1 / 8, unit: "MB/s" },
"Gbit/s": { factor: 1 / 8, unit: "GB/s" },
};
const unitKeys = Object.keys(conversions);
const regex = new RegExp(
"(\\d+(?:\\.\\d+)?)\\s*(" + unitKeys.join("|") + ")",
"gi"
);
function convertText(text) {
return text.replace(regex, (match, value, unit) => {
if (match.includes("(")) return match; // already converted
const num = parseFloat(value);
const { factor, unit: newUnit } = conversions[unit];
const converted = (num * factor).toFixed(2);
return `${match} (${converted} ${newUnit})`;
});
}
function processNode(node) {
if (!node) return;
// Text node
if (node.nodeType === 3 && !node.parentNode?.dataset.converted) {
const newText = convertText(node.nodeValue);
if (newText !== node.nodeValue) {
node.nodeValue = newText;
node.parentNode.dataset.converted = "true";
}
}
// Element node with number + unit split
if (node.nodeType === 1 && !node.dataset.converted) {
const next = node.nextSibling;
if (next && next.nodeType === 1) {
const num = parseFloat(node.textContent.trim());
const unitText = next.textContent.trim();
if (!isNaN(num) && conversions[unitText]) {
const { factor, unit } = conversions[unitText];
const converted = (num * factor).toFixed(2);
next.textContent = unitText + ` (${converted} ${unit})`;
next.dataset.converted = "true";
}
}
}
}
// Initial scan (only visible text nodes)
function initialScan() {
document.querySelectorAll("body *:not([data-converted])").forEach((el) => {
if (el.childNodes.length === 1 && el.childNodes[0].nodeType === 3) {
processNode(el.childNodes[0]);
}
});
}
initialScan();
// Mutation observer (optimized)
const observer = new MutationObserver((mutations) => {
for (const mutation of mutations) {
if (mutation.type === "characterData") {
processNode(mutation.target);
} else if (mutation.type === "childList") {
mutation.addedNodes.forEach((node) => {
processNode(node);
if (node.querySelectorAll) {
node.querySelectorAll("*").forEach(processNode);
}
});
}
}
});
observer.observe(document.body, {
childList: true,
subtree: true,
characterData: true,
});
})();