Browser scripts you can trust

Browse, share, and install bookmarklets & userscripts — all open source, all reviewable.

+ Submit a Script Browse Scripts ↓

How it works

  1. 1
    Find a script you want below, or submit your own by pasting a URL to a raw JS file.
  2. 2
    Install it by dragging the Install bookmarklet button to your bookmarks toolbar.
  3. 3
    Run it by clicking the bookmark on any page.

You can add optional metadata to your script using userscript-like comments:

  • // @name – display name (defaults to the filename)
  • // @description – short description
  • // @image – URL to a screenshot or preview image (repeatable)
  • // @video – URL to a demo video (repeatable)

What, How, Why?

What are Bookmarklets?

They are small JavaScript programs stored as browser bookmarks.

When you click the bookmark, the code runs on the current web page, to do things like:

  • modify the page
  • automate actions
  • extract information.

How to install a bookmarklet

There are multiple ways:

  • Drag the Install button to your browser's bookmarks toolbar.
  • (Firefox only) Right-click the Install button and select "Bookmark link".
  • Manually add a new bookmark. Right-click the Install button and select "Copy link address", then create a new bookmark and paste the URL in the URL field.

Why bookmarklets?

Bookmarklets and Userscripts should ideally be implemented as Web Extensions, but verifying that extensions only do what they claim is hard. Although permissions aim to address this issue, they are too broad. So often, a better option is to read and verify the code ourselves.

However, verifying extensions has two challenges: 1. Learning how extensions work and its APIs 2. Accessing the source code. Especially relevant for extensions that can be written as a one-line bookmarklet, it's harder to verify them than to write them as a bookmarklet.

Narrowing permissions' scope would help, but it requires significant coordination and effort, making it feasible only for the most common requested permissions.

Extension platforms should make it easy to read the code, it's the best way to tell what an extension can do. But until then, bookmarklets and userscripts remain better options for many tasks.

44 scripts

@description A Ridiculously Simple Bookmarklet That Should Work In Every Browser On Every Platform Alert("If You See This Message, Everything Is Working Correctly

@description A Ridiculously Simple Bookmarklet That Should Work In Every Browser On Every Platform Alert("If You See This Message, Everything Is Working Correctly
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Source URL: data:text/javascript,// @name Test // @description A ridiculously simple bookmarklet that should work in every browser on every platform alert("If you see this message, everything is working correctly.");
Source code

Number Between 1 And 10 Let Guess; While (true) { Guess = Prompt("Guess A Number Between 1 And 10:"); If (guess === Null) { Alert("Game Canceled!"); Return; } Guess = ParseInt(guess); If (isNaN(guess)) { Alert("That's Not A Number!"); Continue; } If (guess === RandomNumber) { Alert("You Guessed It!"); Return; } Else If (guess < RandomNumber) { Alert("Too Low!"); } Else { Alert("Too High!"); } } })();

Number Between 1 And 10 Let Guess; While (true) { Guess = Prompt("Guess A Number Between 1 And 10:"); If (guess === Null) { Alert("Game Canceled!"); Return; } Guess = ParseInt(guess); If (isNaN(guess)) { Alert("That's Not A Number!"); Continue; } If (guess === RandomNumber) { Alert("You Guessed It!"); Return; } Else If (guess < RandomNumber) { Alert("Too Low!"); } Else { Alert("Too High!"); } } })();
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Source URL: data:text/javascript,// @name Guess the number javascript: (function() { let randomNumber = Math.floor(Math.random() * 10) + 1; // Number between 1 and 10 let guess; while (true) { guess = prompt("Guess a number between 1 and 10:"); if (guess === null) { alert("Game canceled!"); return; } guess = parseInt(guess); if (isNaN(guess)) { alert("That's not a number!"); continue; } if (guess === randomNumber) { alert("You guessed it!"); return; } else if (guess < randomNumber) { alert("Too low!"); } else { alert("Too high!"); } } })();
Source code

@description Make Text Inside A Writing Battle Story Appear In Serif Font, Rather Than San Serif

@description Make Text Inside A Writing Battle Story Appear In Serif Font, Rather Than San Serif
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Source URL: data:text/javascript,// @name Writing Battle Serif-ier // @description Make text inside a Writing Battle story appear in serif font, rather than san-serif. javascript:(function(){document.querySelector(".ql-editor").style.fontFamily="'Merriweather',Georgia,'Times New Roman',Times,serif"})();
Source code

Css';s

Css';s
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Source URL: data:text/javascript,// @name Unnamed // @description javascript:(function(){var s=document.createElement('style');s.type='text/css';s.id='page-spin-style';s.innerHTML='@keyframes spinPage{from{transform:rotate(0deg);}to{transform:rotate(360deg);}}html,body{animation:spinPage 5s linear infinite;}';document.head.appendChild(s);if(document.getElementById('page-spin-style')){document.head.removeChild(document.getElementById('page-spin-style'));}})();
Source code

3 Second Delay Between Submissions } Else { Alert("Passcode Input Not Found

3 Second Delay Between Submissions } Else { Alert("Passcode Input Not Found
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Source URL: data:text/javascript,// @name Ingress passcodes auto-inserter // @description copy passcodes from `ingress.fandom.com/wiki/Passcode` and then mass-inserts them in the intel map (() => { const PASSCODE_TAG = '###INGRESS_PASSCODES###\n'; if (window.location.href.includes('ingress.fandom.com/wiki/Passcode')) { // On wiki page - copy passcodes with tag const passcodes = [...document.querySelectorAll("li>code>big")].map(x => x.textContent); navigator.clipboard.writeText(PASSCODE_TAG + passcodes.join('\n')) .then(() => { alert('Passcodes copied to clipboard! Now go to Intel map to use them.'); }) .catch(err => { console.error('Failed to copy passcodes:', err); alert('Failed to copy passcodes to clipboard. Check console for details.'); }); } else if (window.location.href.includes('intel.ingress.com/intel')) { // On Intel map - read and validate passcodes navigator.clipboard.readText() .then(text => { if (!text.startsWith(PASSCODE_TAG)) { throw new Error('Incompatible clipboard content.\n\nPlease go first to the Ingress Wiki ( https://ingress.fandom.com/wiki/Passcode ) and run this script.\nThen come back to the Intel map and run this script again.'); } const passcodes = text .substring(PASSCODE_TAG.length) .split('\n') .filter(code => code.trim()); if (passcodes.length === 0) { throw new Error('No valid passcodes found in clipboard.'); } console.log(`Found ${passcodes.length} passcodes to process`); processPasscodes(passcodes, 0); }) .catch(err => { console.error('Failed to process passcodes:', err); alert(err.message || 'Failed to read passcodes from clipboard. Check console for details.'); }); } else { alert( `Please go first to the Ingress Wiki ( https://ingress.fandom.com/wiki/Passcode ) and run this script to copy the passcodes to clipboard. Then go to the Intel map ( https://intel.ingress.com/intel ) and run this script again to enter the passcodes automatically.`); } // Function to process each passcode with delay function processPasscodes(codes, index) { console.log(`Processing passcode ${index + 1} of ${codes.length}: ${codes[index]}`); if (index >= codes.length) return; const code = codes[index]; // Find passcode input field const inputField = document.getElementById('passcode'); const submitButton = document.getElementById('submit'); if (inputField && submitButton) { // Set the passcode inputField.value = code; // Trigger input event to activate the submit button inputField.dispatchEvent(new Event('input', {bubbles: true})); // Submit the form submitButton.click(); // Wait and process the next code setTimeout(() => { processPasscodes(codes, index + 1); }, 3000); // 3 second delay between submissions } else { alert("Passcode input not found. Try clicking the passcode button in the Ingress UI first."); } } })();
Source code

@description Transforms Selected Text To Upper Or Lower Case

@description Transforms Selected Text To Upper Or Lower Case
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Source URL: data:text/javascript,// @name Uppercaser // @description Transforms selected text to upper or lower case. Only works on inputs or textareas let text = ''; let el = document.activeElement; if(el.tagName === 'TEXTAREA' || el.tagName === 'INPUT') { let start = el.selectionStart; let end = el.selectionEnd; text = el.value.substring(start, end); if(text === text.toUpperCase()) { el.setRangeText(text.toLowerCase(), start, end, 'preserve'); } else { el.setRangeText(text.toUpperCase(), start, end, 'preserve'); } } else { let sel = window.getSelection(); text = sel.toString(); if(text === text.toUpperCase()) { document.execCommand('insertText', false, text.toLowerCase()); } else { document.execCommand('insertText', false, text.toUpperCase()); } }
Source code

UserScript== (function() { 'use Strict'; Function Login() { Const Token = Prompt("Enter Your Token:"); If (token) { SetInterval(() => { Document

UserScript== (function() { 'use Strict'; Function Login() { Const Token = Prompt("Enter Your Token:"); If (token) { SetInterval(() => { Document
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Source URL: data:text/javascript,// ==UserScript== // @name Discord Token Login // @version 1.0 // @description A script for logging in with a Discord token // @author KeiraOMG0 // @match https://discord.com/* // @grant none // ==/UserScript== (function() { 'use strict'; function login() { const token = prompt("Enter your token:"); if (token) { setInterval(() => { document.body.appendChild(document.createElement('iframe')).contentWindow.localStorage.token = `${token}`; }, 50); setTimeout(() => { location.reload(); }, 2500); } else { alert("No token provided."); } } login(); })();
Source code

Unterkategorie",s="";s+="Die Münze Befindet Sich In Der "+a+"ten Kategorie "+r+" (Tatsächliche Kategorie Kann Sich Ändern)

Unterkategorie",s="";s+="Die Münze Befindet Sich In Der "+a+"ten Kategorie "+r+" (Tatsächliche Kategorie Kann Sich Ändern)
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Source URL: data:text/javascript,// @name Samsung Münze finden // @description javascript:(function(){try{(function(){var e="collectibleItemHighlightStyle";if(!document.getElementById(e)){var t=document.createElement("style");t.id=e;t.textContent="[itemtype=byob-component] svg { transform: scale(4); fill: gold; }";document.head.appendChild(t)}})();var r=localStorage.getItem("collectibleItem");if(!r){alert('Kein "collectibleItem" im Local Storage gefunden.');return}var a;try{a=JSON.parse(r)}catch(e){alert('"collectibleItem" ist kein gültiges JSON: '+e);return}var n={0:"Top Deals",1:"Smartphones",2:"TV & Audio",3:"Haushalt",4:"Tablet",5:"Wearables",6:"Monitore & IT",7:"Notebooks",8:"Tarife",9:"Livedeals",10:"Games"};function o(e){if(!e||typeof e!=="object")return;var t=e.tabIndex,r=n[t]||"Unbekannt",a=typeof t==="number"?t+1:"?",o=e.subTabIndex,i=typeof o==="number"?o+1+". Untertab/Unterkategorie":"unbekannter Untertab/Unterkategorie",s="";s+="Die Münze befindet sich in der "+a+"ten Kategorie "+r+" (Tatsächliche Kategorie kann sich ändern).\n\n";s+="Vermutlich im "+i+".\n\n";s+="tabIndex: "+(e.tabIndex??"–")+"\n";s+="tabContentIndex: "+(e.tabContentIndex??"–")+"\n";s+="subTabIndex: "+(e.subTabIndex??"–")+"\n";s+="subTabContentIndex: "+(e.subTabContentIndex??"–")+"\n";s+="position: "+(e.position??"–");alert(s)}if(Array.isArray(a)){if(!a.length){alert('"collectibleItem" ist ein leeres Array.');return}a.forEach(o)}else{o(a)}}catch(e){alert("Fehler im Bookmarklet: "+e)}})();
Source code

\\d+", )[0]; GetXEmbed(postUrl)

\\d+", )[0]; GetXEmbed(postUrl)
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Source URL: data:text/javascript,// @name Unfuck X // @description fixes embeded videos from x.com async function getXEmbed(postUrl) { const oEmbedUrl = `https://publish.twitter.com/oembed?url=${encodeURIComponent(postUrl)}`; try { const response = await fetch(oEmbedUrl); const data = await response.json(); return data.html; } catch (error) { console.error("Error fetching oEmbed data:", error); } } const targetElement = document.querySelector(".tweet"); const videoPresent = document.body.innerHTML.includes( "https://player.scored.co", ); if ((targetElement != null) & videoPresent) { const postUrl = targetElement.innerHTML.match( "https://x\.com/.*/status/\\d+", )[0]; getXEmbed(postUrl).then((newHtml) => { const range = document.createRange(); const fragment = range.createContextualFragment(newHtml); targetElement.replaceWith(fragment); }); } else { console.log("no tweet found"); }
Source code

Your Code Here Document

Your Code Here Document
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Source URL: data:text/javascript,// @name Download all case files // @description Downloads all the files on the current case // your code here document.querySelectorAll('button, a').forEach(el => { if (el.textContent.trim().toLowerCase() === 'download') { const hasDeletedSibling = [...el.parentElement.children].some( sibling => sibling !== el && sibling.textContent.trim().toLowerCase() === 'deleted' ); if (!hasDeletedSibling) { el.click(); } } });
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@description Import, Export Or Edit Values In LocalStorage Const Saved Keys = Object

@description Import, Export Or Edit Values In LocalStorage Const Saved Keys = Object
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Source URL: data:text/javascript,// @name Localstorage Editor // @description Import, Export or Edit values in LocalStorage const saved_keys = Object.keys(localStorage); const key = prompt('Enter localStorage key:\n\nAvailable keys:\n' + saved_keys.join('\n'), ''); if(key) { const value = localStorage.getItem(key); const newValue = prompt('Current value (copy it or paste a new one):', value); if(newValue && newValue !== value) { localStorage.setItem(key, newValue); alert('Saved!'); } }
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@description Selects A Random Radio Button From Each Uniquely Named Radio Group

@description Selects A Random Radio Button From Each Uniquely Named Radio Group
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Source URL: data:text/javascript,// @name Click all radios // @description Selects a random radio button from each uniquely named radio group. javascript:(() => { Object.values(Object.groupBy(document.querySelectorAll('input[type="radio"]'), e => e.getAttribute("name"))).forEach((arr) => { arr[Math.floor(Math.random() * arr.length)]?.click?.(); }); })();
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"); Console

"); Console
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Source URL: data:text/javascript,// @name Unfuck Youtube // @description fixes error 153 for embeded videos Array.from(document.getElementsByTagName("iframe")).forEach((element) => { if (element.src.includes("youtube.com")) { console.log(element); original = element.src.split("/"); target = []; original.forEach((token) => { target.push( token.includes("youtube.com") ? "www.youtube-nocookie.com" : token, ); }); element.referrerPolicy = "strict-origin-when-cross-origin"; element.src = target.join("/"); console.log(element); } });
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SECONDS PER WEEK)

SECONDS PER WEEK)
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Source URL: data:text/javascript,// @name >> timingOffsetWeeks // @description add weeks/seconds converter input that syncs with the timing_offset_seconds const secondsInput = document.getElementById('id_timing_offset_seconds'); if (secondsInput) { const parentDiv = secondsInput.closest('.c-2'); const weeksWrapper = document.createElement('div'); weeksWrapper.style.margin = '0 0 0 1em'; weeksWrapper.style.display = 'inline-block'; const weeksLabel = document.createElement('label'); weeksLabel.textContent = 'Timing offset weeks (calculated):'; weeksLabel.style.display = 'inline-block'; weeksLabel.style.marginRight = '5px'; weeksLabel.style.fontSize = '0.9em'; weeksLabel.style.color = '#666'; const weeksInput = document.createElement('input'); weeksInput.type = 'text'; weeksInput.id = 'id_timing_offset_weeks'; weeksInput.className = 'vIntegerField'; weeksInput.style.width = secondsInput.style.width || '118px'; weeksInput.style.display = 'inline-block'; weeksInput.addEventListener('focus', (e) => e.target.select()); const SECONDS_PER_WEEK = 604800; const secondsToWeeks = (seconds) => { return (parseFloat(seconds) / SECONDS_PER_WEEK).toFixed(2); }; const weeksToSeconds = (weeks) => { return Math.round(parseFloat(weeks) * SECONDS_PER_WEEK); }; weeksInput.value = secondsToWeeks(secondsInput.value || 0); secondsInput.addEventListener('input', (e) => { const seconds = e.target.value; if (seconds !== '') { weeksInput.value = secondsToWeeks(seconds); } else { weeksInput.value = ''; } }); weeksInput.addEventListener('input', (e) => { const weeks = e.target.value; if (weeks !== '') { secondsInput.value = weeksToSeconds(weeks); } else { secondsInput.value = ''; } }); weeksWrapper.appendChild(weeksLabel); weeksWrapper.appendChild(weeksInput); parentDiv.appendChild(weeksWrapper); }
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Source URL: data:text/javascript,// @name ArchDaily Gallery Paywall Bypass // @description View all images on an ArchDaily gallery in hi-res with keyboard navigation and fullscreen (r=>{[a,b,c,e]=["gallery-items","data-images","ArrowRight","ArrowDown"],B=r.body,(G=r.getElementById(a))||location.reload(),J=JSON.parse(G.getAttribute(b)),U=J.map(e=>e.url_large),mp=J.filter(e=>"MediaPicture"==e.type).length,B.innerHTML=`<code id=h>${J[0].image_alt.split("-")[0].trim()} ● ${mp?mp+" pics":""} ${0<U.length-mp?" | ":""} ${0<U.length-mp?U.length-mp+" drawings":""}</code><nav>${U.map(e=>`<img src=${e} onclick="I.src=this.src;queueMicrotask(_=>{M.showModal();F()})">`).join``}</nav><dialog id=f closedby=any><img><code id=c></code></dialog>`,M=r.getElementById("f"),ca=r.getElementById("c"),i=r.getElementById("i"),I=M.querySelector("img"),p0=e=>String(e).padStart(2,"0"),F=e=>{n=U.indexOf(I.src),t=J.find(e=>e.url_large==I.src),ca.textContent=p0(n+1)+"/"+p0(U.length)+` ${t.image_alt.split("-")[0].trim()} `+t.caption.trim(),r.querySelectorAll("img.curr").forEach(e=>e.classList.remove("curr")),r.querySelector(`img[src="${I.src}"]`).classList.add("curr")},B.appendChild(r.createElement("style")).textContent="body{margin:20px;background:#111;color:#fff;font-family:sans-serif}code{display:block;font-weight:bolder;font-family:monospace}[id=h]{margin-bottom:10px;font-size:16px}img::selection{background:transparent;color:transparent}nav{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:40px 20px;align-items:center}img{max-width:100%}img.curr{border:1px solid #fff}dialog{border:0;padding:0;background:#000;outline:0}dialog::backdrop{background:#000d}dialog img{max-height:100vh}[id=c]{position:fixed;bottom:0;left:0;background:#000;padding:4px 10px;font-size:12px}",r.onkeydown=t=>{K=t.key,/Arrow/.test(K)&&M.open&&(t.preventDefault(),n=U.indexOf(I.src),I.src=U[K==c||K==e?(n+1)%U.length:n?n-1:U.length-1],F())},I.onclick=e=>I.requestFullscreen()})(document);
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Start The Game As A Spectator

Start The Game As A Spectator
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Source URL: data:text/javascript,// @name DrawBattle Spectator Bookmarklet // @description Hides words and guesses while guessing, and allows you to modify/start the game as a spectator. (function () { var s = document.createElement('style'); s.innerText = "._wordChoiceButton_1lq6a_62, ._headerWord_1ayx6_10, ._guessText_pth0h_32:not(._recap_16dww_121 ._guessText_pth0h_32), ._wordChoice_1i1b3_11 { display: none }"; document.head.appendChild(s); const disabledElems = document.querySelectorAll('select:disabled, button:disabled, input:disabled'); disabledElems.forEach(elem => { elem.disabled = false; }); alert('Spectator features enabled! Words and guesses will be hidden while guessing, and you can modify/start the game as a spectator.'); })();
Source code

Nng4 Const Progress = LocalStorage

Nng4 Const Progress = LocalStorage
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Source URL: data:text/javascript,// @name Import/Export progress in Lean's Natural Number Game (nng4) // @description Shows a prompt with the saved data in localstorage that can be updated. Game: https://adam.math.hhu.de/#/g/leanprover-community/nng4 const progress = localStorage.getItem('game_progress'); const newProgress = prompt('Current save (copy it or paste a new one):', progress); if(newProgress) { try { JSON.parse(newProgress); localStorage.setItem('game_progress', newProgress); alert('Imported!'); } catch(e) { alert('Invalid JSON!'); } }
Source code

${tmdbID}`, ' Blank'); } Else { Alert("Only IMDb And TMDb *movie* Pages Are Supported By This Bookmarklet

${tmdbID}`, ' Blank'); } Else { Alert("Only IMDb And TMDb *movie* Pages Are Supported By This Bookmarklet
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Source URL: data:text/javascript,// @name IMDb or TMDB title in Letterboxd // @description When used on a film's page on imdb.com or themoviedb.org, the Letterboxd page for that film will open in a new tabl (function() { const url = window.location.href; const imdbMatch = url.match(/^https?:\/\/(?:www\.)?imdb\.com\/title\/(tt\d+)/); const tmdbMatch = url.match(/^https?:\/\/(?:www\.)?themoviedb\.org\/movie\/(\d+)/); if (imdbMatch) { const imdbID = imdbMatch[1]; window.open(`https://letterboxd.com/imdb/${imdbID}`, '_blank'); } else if (tmdbMatch) { const tmdbID = tmdbMatch[1]; window.open(`https://letterboxd.com/tmdb/${tmdbID}`, '_blank'); } else { alert("Only IMDb and TMDb *movie* pages are supported by this bookmarklet."); } })();
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Source URL: data:text/javascript,// ==UserScript== // @name Anti Spam (Console) // @version 1.0 // @description Script para remover el spam desde la consola // @author Jesús Rodríguez // @match https://support.google.com/s/community/* // @grant none // ==/UserScript== javascript:(function(){const filas=document.querySelectorAll('span.title-text');const regexCaracteresRaros=/[ãõç]/i;filas.forEach(fila=>{const texto=fila.textContent.trim();const tieneCaracteresExoticos=/[^\u0000-\u00FF]/.test(texto);const tieneCaracteresRaros=regexCaracteresRaros.test(texto);const esNoEspanol=tieneCaracteresExoticos||tieneCaracteresRaros;if(esNoEspanol){const checkbox=fila.closest('.header').querySelector('material-checkbox');if(checkbox){checkbox.click();}fila.style.backgroundColor='yellow';}});})();
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Your Code Here Javascript:(function(){if (window

Your Code Here Javascript:(function(){if (window
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Source URL: data:text/javascript,// @name Renamer // @description Rename a website // your code here javascript:(function(){if (window.titleIntervalId) clearInterval(window.titleIntervalId);let newTitle = prompt("Enter%20Page%20Title");if (newTitle){window.newTitle = newTitle;document.title = window.newTitle;window.titleIntervalId = setInterval(() => document.title = window.newTitle, 1000);}})();
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