Guides

Download Pageside and get it running — on your computer or your phone.

Download

Current version: 3.0.1. Stock Chrome on Android does not support extensions — use one of the Android browsers listed above.

Install on desktop (Chrome / Edge / Opera / Brave)

• Download pageside-desktop.zip and unzip it into a folder you'll keep (the browser loads the extension from that folder, so don't delete it afterwards).
• Open chrome://extensions (or opera://extensions / edge://extensions).
• Toggle Developer mode on — the switch is in the top-right corner.
• Click Load unpacked and select the unzipped folder (the one containing manifest.json).
• Pin the Pageside icon to the toolbar so the popup is one click away. On Opera and Firefox you can also open Pageside from the sidebar.

Install on Android (Kiwi Browser — step by step)

Kiwi is the most popular Android browser with extension support. These steps assume you've never sideloaded an extension before.

• On your phone, download pageside-kiwi.zip — it lands in your Downloads folder. Use this Android build, not the desktop one: Kiwi silently does nothing when you load the desktop (Manifest V3) zip.
• Open Kiwi Browser, type kiwi://extensions in the address bar and go (or tap the ⋮ menu → Extensions).
• Turn Developer mode ON — the toggle is in the top-right corner. New buttons appear once it's on.
• Tap + (from .zip/.crx/.user.js), navigate to Downloads, and tap pageside-kiwi.zip.
• Confirm the permissions prompt. Pageside now appears in the extensions list with its toggle ON.
• To use it: tap ⋮ — installed extensions are listed near the bottom of the menu. Tap Pageside and the panel opens.

Mises / Lemur: identical flow (⋮ → Extensions → Developer mode → install from zip). Yandex: rename the file from .zip to .crx first, then open it from your file manager.

Verify it works

• Visit any normal website (extensions can't run on browser-internal pages like chrome://… or the new-tab page).
• Open the Pageside panel — the Detected site label should show the site's base domain, e.g. example.com.
• Quick smoke test: expand Style, type body { background: #102030; }, tap Save Style Changes — the page background changes immediately, and stays changed on every future visit.

Your first style, in 30 seconds

• Try before saving: type CSS and hit Preview on Page — the page updates instantly; reload to discard, or Save to keep.
• Start from a preset: Dark mode, Hide sticky/cookie bars, Readable text, or Bigger text — each is appended to the editor for you to tune.
• Don't know the selector? Select Container copies the exact CSS selector of anything you click. Hide Element removes the clicked element from the site permanently (undo by deleting the saved rule).
• Back up: Tools → Export JSON saves every site's styles to a file; Import JSON restores them on any machine.

Updating

• Desktop: download the new zip, unzip it over the same folder, then click the reload (circular arrow) icon on the extension card in chrome://extensions.
• Android: install the new zip the same way as the first time — it replaces the old version. Your styles and notes are kept (they live in browser storage, not in the extension files).

Stuck? Head to the support page — the FAQ covers the common issues, and you can reach a human by email.