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feat: netflix subtitle restyle userscript with settings panel

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2026-07-21 11:14:02 +02:00
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netflix-subtitle-restyle.user.js
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// ==UserScript==
// @name Netflix subtitle restyle
// @namespace https://git.owall.se/oscar/nfsub
// @description Render Netflix subtitles in a custom font, with optional size, color, and outline overrides
// @version 1.0.0
// @match *://www.netflix.com/*
// @homepageURL https://git.owall.se/oscar/nfsub
// @supportURL https://git.owall.se/oscar/nfsub/issues
// @downloadURL https://git.owall.se/oscar/nfsub/raw/branch/main/netflix-subtitle-restyle.user.js
// @updateURL https://git.owall.se/oscar/nfsub/raw/branch/main/netflix-subtitle-restyle.user.js
// @grant GM_addStyle
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// @run-at document-end
// ==/UserScript==
'use strict';
const defaults = {
fontFamily: '"Atkinson Hyperlegible", "Trebuchet MS", sans-serif',
fontWeight: '',
fontSize: '',
colorEnabled: false,
color: '#ffffff',
outlineWidth: 2,
outlineColor: '#000000',
};
let config = { ...defaults, ...GM_getValue('config', {}) };
const subtitleStyle = document.createElement('style');
document.head.append(subtitleStyle);
function outlineShadow(widthPx, color) {
const offsets = [];
for (const x of [-widthPx, 0, widthPx]) {
for (const y of [-widthPx, 0, widthPx]) {
if (x !== 0 || y !== 0) {
offsets.push(`${color} ${x}px ${y}px 0`);
}
}
}
return offsets.join(', ');
}
function applyConfig() {
const declarations = [];
if (config.fontFamily.trim()) {
declarations.push(`font-family: ${config.fontFamily} !important`);
}
if (config.fontWeight.trim()) {
declarations.push(`font-weight: ${config.fontWeight} !important`);
}
if (config.fontSize.trim()) {
declarations.push(`font-size: ${config.fontSize} !important`);
}
if (config.colorEnabled) {
declarations.push(`color: ${config.color} !important`);
}
if (config.outlineWidth > 0) {
declarations.push(
`text-shadow: ${outlineShadow(config.outlineWidth, config.outlineColor)} !important`
);
}
subtitleStyle.textContent = declarations.length
? `.player-timedtext .player-timedtext-text-container,
.player-timedtext .player-timedtext-text-container * {
${declarations.join(';\n ')};
}`
: '';
}
function save() {
GM_setValue('config', config);
applyConfig();
}
function el(tag, props = {}, ...children) {
const node = document.createElement(tag);
Object.assign(node, props);
node.append(...children);
return node;
}
function row(labelText, ...controls) {
return el('label', { className: 'nfsub-row' }, el('span', {}, labelText), ...controls);
}
function textInput(key, placeholder) {
const input = el('input', { type: 'text', value: config[key], placeholder });
input.addEventListener('input', () => {
config[key] = input.value;
save();
});
return input;
}
function colorInput(key) {
const input = el('input', { type: 'color', value: config[key] });
input.addEventListener('input', () => {
config[key] = input.value;
save();
});
return input;
}
function buildPanel() {
const colorToggle = el('input', { type: 'checkbox', checked: config.colorEnabled });
colorToggle.addEventListener('input', () => {
config.colorEnabled = colorToggle.checked;
save();
});
const outlineInput = el('input', {
type: 'number',
min: '0',
max: '10',
step: '0.5',
value: String(config.outlineWidth),
});
outlineInput.addEventListener('input', () => {
config.outlineWidth = Math.max(0, parseFloat(outlineInput.value) || 0);
save();
});
const closeButton = el('button', { type: 'button', className: 'nfsub-close' }, '×');
const resetButton = el('button', { type: 'button', className: 'nfsub-reset' }, 'Reset to defaults');
const node = el(
'div',
{ className: 'nfsub-panel' },
el('div', { className: 'nfsub-header' }, el('strong', {}, 'Netflix subtitle style'), closeButton),
row('Font family', textInput('fontFamily', 'Netflix default')),
row('Font weight', textInput('fontWeight', 'Netflix default, e.g. 700')),
row('Font size', textInput('fontSize', 'Netflix default, e.g. 2.6vw')),
row('Text color', el('span', { className: 'nfsub-pair' }, colorToggle, colorInput('color'))),
row('Outline (px)', el('span', { className: 'nfsub-pair' }, outlineInput, colorInput('outlineColor'))),
resetButton
);
closeButton.addEventListener('click', togglePanel);
resetButton.addEventListener('click', () => {
config = { ...defaults };
save();
const parent = node.parentNode;
node.remove();
panel = buildPanel();
parent.append(panel);
});
// Keep typed keys away from the player's keyboard shortcuts
for (const type of ['keydown', 'keyup', 'keypress']) {
node.addEventListener(type, (event) => event.stopPropagation());
}
return node;
}
let panel = null;
function togglePanel() {
if (panel) {
panel.remove();
panel = null;
return;
}
panel = buildPanel();
(document.fullscreenElement || document.body).append(panel);
}
GM_addStyle(`
.nfsub-panel {
position: fixed;
top: 16px;
right: 16px;
z-index: 2147483647;
width: 320px;
padding: 14px 16px;
border-radius: 8px;
background: #141414;
color: #e5e5e5;
font: 13px/1.4 Arial, sans-serif;
box-shadow: 0 4px 24px rgba(0, 0, 0, 0.6);
}
.nfsub-header {
display: flex;
align-items: center;
justify-content: space-between;
margin-bottom: 10px;
font-size: 14px;
}
.nfsub-close {
background: none;
border: none;
color: #999;
font-size: 18px;
cursor: pointer;
padding: 0 4px;
}
.nfsub-close:hover { color: #fff; }
.nfsub-row {
display: grid;
grid-template-columns: 96px 1fr;
align-items: center;
gap: 8px;
margin: 8px 0;
}
.nfsub-row input[type="text"] {
width: 100%;
box-sizing: border-box;
padding: 4px 6px;
border: 1px solid #555;
border-radius: 4px;
background: #333;
color: #fff;
}
.nfsub-row input[type="number"] {
width: 64px;
padding: 4px 6px;
border: 1px solid #555;
border-radius: 4px;
background: #333;
color: #fff;
}
.nfsub-row input[type="color"] {
width: 36px;
height: 26px;
padding: 0;
border: 1px solid #555;
border-radius: 4px;
background: #333;
cursor: pointer;
}
.nfsub-pair {
display: flex;
align-items: center;
gap: 8px;
}
.nfsub-reset {
margin-top: 10px;
width: 100%;
padding: 6px 0;
border: 1px solid #555;
border-radius: 4px;
background: #333;
color: #e5e5e5;
cursor: pointer;
}
.nfsub-reset:hover { background: #444; }
`);
applyConfig();
GM_registerMenuCommand('Subtitle style settings', togglePanel);