Best AI Summarizer Chrome Extensions in 2026

The right AI summarizer Chrome extension depends on three things: the source you read most often, the privacy approach you need, and whether you want a focused summarizer or a broad AI assistant. The field has both kinds, and they're optimized for different jobs.

Anya is a content research lead — she scans dozens of competitor articles a week and is allergic to sign-up walls. Theo is an academic researcher living in PDFs and research papers, where structured outputs and citations matter. Nico is a developer who wants to bring his own provider API key and route requests direct from your browser to OpenAI, Anthropic, Google Gemini, DeepSeek, or xAI Grok without an extension vendor in the middle. The same shortlist won't fit all three.

This roundup compares the best AI summarizer Chrome extensions in 2026 by source coverage, BYOK support, free-tier honesty, local-first storage, and the workflow after the summary is generated. Reduz appears in the list because Reduz is one of the products in the category — see the methodology box for what each tool was judged on.

Why use an AI summarizer Chrome extension at all?

A Chrome extension summarizer has a structural advantage over a web-app summarizer: it can read the page you already have open — full DOM, rendered content, your auth state — instead of a server trying to refetch the URL with no login, no cookies, and a paywall in the way. For Anya, that means summarizing a paywalled industry blog she has access to. For Theo, it means summarizing a PDF rendered in Chrome without uploading the file anywhere. For Nico, it means the request can go direct from your browser to the AI provider without a vendor pipe in the middle. The extension category also lets the same tool work across YouTube, PDFs, articles, and selected text with one workflow, instead of switching between four single-purpose websites. The right one fits the source type you actually read, has a free tier that survives daily use, and respects how much data leaves your browser.

The list

AI summarizer

Reduz

Reduz turns whatever you have open in Chrome into a clean summary: YouTube videos, PDFs, articles, webpages, and selected text. Use your own key from OpenAI, Anthropic, Google, DeepSeek, or xAI for unlimited use, with the key stored in Chrome on your device. Or start with 100 free credits a month, no card needed. Every summary saves to a searchable local history. Export to PDF, Markdown, or ZIP.

Best for:People who summarize YouTube videos, PDFs, articles, and webpages in Chrome and want to use their own AI key or start with free credits.

Fits Anya scanning competitor articles, Theo working through research papers, and Nico routing requests through a personal Anthropic key. Same extension, no account needed when you use your own AI key.

Strengths

Works on YouTube videos, PDFs, articles, webpages, and selected text from one extension.
Use your own AI key across OpenAI, Anthropic, Google, DeepSeek, or xAI. Keys stay on your device.
History, settings, and exports are local. Cloud backup is opt-in.

Tradeoffs

Focused on summaries. Not a chat assistant or browser automation tool.
AI generation still uses your selected provider in the cloud (local-first, not offline-only).

How to get started

Install Reduz from the Chrome Web Store.
Pick your own AI key or free credits in the first-run chooser.
Open the YouTube video, PDF, or article you want to summarize.
Click the Reduz toolbar icon.
Save, export, or copy the summary. Local history keeps it searchable.

Pricing:Free with 100 credits a month, no card. Using your own AI key is unlimited at provider rates (typically cents per article). Pro is $3/mo for 1,000 credits, Premium is $9/mo for 5,000 credits.

Read the Reduz comparison

All-in-one browser side panel

Sider

Sider is a multi-model side-panel AI assistant covering chat, summarization, writing, translation, and PDF analysis. It supports many AI models through a side-panel workflow — useful when summary is one job among several. Sider is paid-mostly: the free tier is small and the paid tiers gate model variety.

Best for:Users who want summarization, chat, writing, translation, PDF analysis, image tools, and multi-model access in one browser assistant.

Fits a user who wants chat, writing, and summarization in one panel and is comfortable with a subscription. Less suitable for Nico when local-first storage or BYOK is a hard requirement.

Strengths

Broad browser assistant with webpage and YouTube summarization.
Supports many AI models through a single side-panel workflow.
Covers reading, writing, translation, PDF analysis, and image workflows.

Tradeoffs

Broader than a focused summarizer, which can be more UI and account surface than needed.
Summary history and provider-key locality are not positioned the same way as Reduz Bring your own AI key.
Verify the pricing tier and renewal terms before subscribing.

How to get started

Install Sider from the Chrome Web Store.
Sign in or create a Sider account.
Open the side panel via the toolbar icon or shortcut.
Pick the model and command (summary, chat, translate, etc.).
Upgrade to a paid tier to unlock model variety and higher quotas.

Pricing:Tiered subscription model from a low monthly entry price up to higher-tier plans. Verify current credit limits and renewal terms on the Sider site before committing.

Automation-heavy browser assistant

HARPA AI

HARPA AI is a browser-agent assistant with 100+ predefined commands for summarization, web automation, monitoring, price tracking, and content workflows. It supports multi-model routing across GPT, Claude, Gemini, DeepSeek, and OpenRouter, and is notable for being one of the few mainstream extensions where bringing your own AI key is part of the offering — though on a paid tier rather than as the default.

Best for:Power users who want page-aware commands, web automation, monitoring, and summaries from one Chrome extension.

Fits Nico when the workflow extends past summaries into web automation and monitoring. Heavier than needed if the job is just reading a source and saving a clean summary.

Strengths

Strong automation posture with many predefined page-aware commands.
Supports webpage, YouTube, file, and PDF summarization workflows.
BYOK is genuinely supported, even if gated behind the lifetime tier.

Tradeoffs

More complex than a dedicated summarizer.
Automation depth can be unnecessary if the job is only reading, saving, and exporting summaries.
BYOK is on the paid tier, not the default mode.

How to get started

Install HARPA AI from the Chrome Web Store.
Sign in and choose a connection: CloudGPT, ChatGPT web session, OpenAI API, OpenRouter, or others.
Open a page and trigger a command like /summary or /youtube-summary.
Use the chat panel or quick-access bar to chain commands.
Add a personal API key on the X-tier plan if you want BYOK routing.

Pricing:Tiered monthly subscriptions plus a one-time X-tier lifetime plan that supports bringing your own provider key. A free tier exists with usage caps.

All-in-one learning assistant

NoteGPT

NoteGPT is a broad learning-and-summary workspace: YouTube summaries, article summaries, PDF chat, audio transcription, mind maps, and study materials in one account. Free tier exists with daily caps — typically a small number of PDFs per day and a per-file size limit. Paid tiers raise the caps.

Best for:Students and creators who want summaries plus transcription, notes, writing, visual, audio, and study tools in one account-centered workspace.

Best for Cleo turning lectures and study materials into reusable notes. Useful when the workflow is reading, studying, and exporting study artifacts — not just summarizing one source.

Strengths

Broad source coverage across YouTube, PDFs, documents, audio, images, slides, and text.
Learning-oriented extras such as mind maps, chat-with-PDF, translation, and generated study materials.
Useful when a web workspace fits the workflow better than an extension alone.

Tradeoffs

The broad workspace can be heavier than a focused summarizer.
Local-first storage and BYOK provider control are not the primary product posture.
Hard free-tier daily caps push users toward the paid tier quickly.

How to get started

Sign up at notegpt.io or install the Chrome extension.
Open a YouTube video, paste an article URL, or upload a PDF.
Choose summary style or generate a mind map.
Export to Markdown, PDF, or download notes.
Upgrade to premium to remove daily caps.

Pricing:Free tier with daily caps and file-size limits, plus a paid premium plan. Check current plan details on the NoteGPT site.

General AI assistant

Monica

Monica is one of the largest all-in-one AI assistants in the Chrome extension category. It bundles chat with multiple models, summarization, translation, writing, and image and video generation. The trade-offs to weigh are free-tier prompt limits and the broader browser permission scope it requests.

Best for:Users who want an all-in-one assistant across browser, desktop, mobile, model chat, writing, search, and media tools.

Fits users who want one AI brand across browser, desktop, and mobile. Less suitable for Anya and Nico when direct from your browser-to-provider or local-first history is the goal.

Strengths

Large all-in-one AI assistant surface across devices.
Good fit when chat, writing, search, image, and video tools matter alongside summaries.
Useful for users who prefer a single assistant brand instead of a task-specific summarizer.

Tradeoffs

Not focused on local-first summarization workflows.
Full-access permission posture is flagged by privacy-conscious reviewers.
Free-tier prompt limits hit quickly on advanced models.

How to get started

Install Monica from the Chrome Web Store.
Sign up or sign in.
Use the toolbar icon or side panel to chat, summarize, translate, or generate images.
Choose model in settings (GPT, Claude, Gemini, etc.).
Upgrade for higher quotas and unlimited memory.

Pricing:Free tier with monthly prompt limits on advanced models, plus a paid Max plan. Check current pricing on the HARPA site.

YouTube-focused summary extension

Eightify

Eightify is a YouTube-only summarizer that injects a polished summary panel into the YouTube watch page with timestamps and translation across many languages. It runs on ChatGPT and Claude under the hood. The product is well-shaped for one job — watch a long video, get the takeaways — and not much else.

Best for:Users who mostly want fast YouTube takeaways directly inside the YouTube page.

Best when YouTube is the only summarization surface in the workflow. Less suitable for Theo with a PDF stack or Anya alternating between videos and articles.

Strengths

Focused product shape for YouTube video summaries.
Good fit when the job is scanning videos, podcasts, news, or tutorials quickly.
The narrow scope can feel simpler than a broad all-in-one assistant.

Tradeoffs

YouTube-only. PDFs, webpages, articles, and selected text are not in scope.
Free tier daily cap is small for heavier viewing days.
Renewal terms and cancellation flows are worth verifying before subscribing.

How to get started

Install Eightify from the Chrome Web Store.
Open a YouTube video.
Click the Eightify button in the YouTube panel or the toolbar icon.
Read the summary in the injected panel.
Sign in or start the trial to summarize beyond the free quota.

Pricing:Free tier with a small daily cap, plus monthly and annual paid plans. Check the current plan pricing on Eightify's site before subscribing.

Transcript and YouTube summary extension

Glasp YouTube Summary

Glasp's YouTube Summary extension is a popular YouTube summarizer. Its meaningful difference from the rest of the field is that the basic flow works with no sign-up required. Users pick which model processes the transcript (ChatGPT, Claude, Gemini, Mistral). The Glasp web app upsells highlighting, social-style learning, and a public profile around saved highlights, which is a separate decision from the extension itself.

Best for:Users who want quick YouTube transcript access, ChatGPT or Claude summaries, and optional Glasp reading workflows.

Good fit when YouTube is the main reading surface and creating one more account is the dealbreaker. Less suitable for Nico who wants direct from your browser-to-provider BYOK rather than Glasp's hosted relay.

Strengths

No-signup flow for basic YouTube summaries — rare in this category.
Strong YouTube transcript handling.
Multiple model choices (ChatGPT, Claude, Gemini, Mistral) without managing provider keys.

Tradeoffs

YouTube-centered. Multi-source workflows need a second tool.
The Glasp ecosystem is broader than private local summary history, so privacy expectations should be checked before opting into the web app.
Reviewers report transcript-extraction failures on specific videos.

How to get started

Install YouTube Summary with ChatGPT & Claude from the Chrome Web Store.
Open a YouTube video.
Click the Glasp icon in the description area or open the side panel.
Pick model and summary style in the extension settings.
Optionally sign up for the Glasp web app to highlight and revisit summaries.

Pricing:Free for the core YouTube summary path with no account. The Glasp web app upsells highlighting, notes, and a learning workflow on top.

Other notable AI summarizer extensions

A handful of smaller extensions are worth knowing about, even if they don't make the main list.

Merlin AI
26-in-1 positioning across summary, writing, and chat. 4.8 Chrome rating. Reviewers note responses can feel "watered down" vs going to the native model provider.
MaxAI
Multi-model assistant with vision and translation across many languages. Free tier with daily caps, paid plan for unrestricted use.
Wiseone
AI reading assistant with Summarize, Cross-check, Focus, and Explore modes. Free tier with monthly summary and fact-check caps, plus a paid Pro plan.
Briefy
Summarizer with visual views (mind maps, tables) for webpages, YouTube, and PDFs. 4.6 Chrome rating.
Gist AI
Web, YouTube, and PDF summarizer that runs on a ChatGPT backend. Multi-source coverage at a smaller install scale than the leaders.
LocalSum
Offline-first summarizer with PII redaction. Privacy specialist at small scale. Free tier with daily uses and an inexpensive paid plan.

Pick by source, not by feature count

Broad assistants like Sider, HARPA, and Monica are useful when you want one AI surface for chat, writing, automation, and image generation alongside summaries. A focused summarizer like Reduz is better when the repeated workflow is reading or watching a source, saving a clean summary, and exporting it later. Eightify and Glasp are right when the only thing you summarize is YouTube. NoteGPT fits if study materials and mind maps matter more than direct from your browser provider control. The privacy and BYOK posture you need narrows the list further. Pick the smallest tool that covers the sources you actually read.

Frequently asked questions

What is the best AI summarizer Chrome extension in 2026?

For multi-source local-first summaries with direct from your browser BYOK and a no-card free tier, Reduz is the focused choice. For broad AI assistant workflows (chat, writing, automation, images), Sider, HARPA, Monica, and NoteGPT fit better. For YouTube-only, Eightify and Glasp YouTube Summary are the largest products.

Should I pick an all-in-one AI assistant or a focused summarizer?

Pick an all-in-one when chat, writing, translation, and image tools matter alongside summaries. Pick a focused summarizer when source coverage, history, exports, BYOK, and privacy approach matter most. Most users don't need both.

Are there free AI summarizer Chrome extensions that don't require sign-up?

Yes. Glasp YouTube Summary works without sign-up for the basic flow. Reduz's bring your own AI key does not require a Reduz account, though it does require a provider API key. Reduz's Hosted Free tier (100 monthly credits) does not need a credit card.

Can I use my own API key with a Chrome extension summarizer?

BYOK is structurally rare in the mainstream category. Reduz uses BYOK as a default mode (direct from your browser to OpenAI, Anthropic, Google, DeepSeek, or xAI). HARPA AI supports BYOK on its lifetime tier. Sider, Monica, Eightify, Glasp, and NoteGPT all route through the vendor's own backend.

Which AI summarizer extension works on PDFs?

Reduz, NoteGPT, Sider, HARPA AI, Briefy, and Gist AI all support PDFs in some form. Eightify and Glasp YouTube Summary are YouTube-only. NoteGPT has the most generous student-oriented PDF workflow; Reduz reads PDFs in-place from the Chrome tab without uploading them.

Which AI summarizer extension is the most privacy-respecting?

Reduz uses the click-only permission instead of permission to read every page, sends BYOK requests direct from your browser to your chosen provider, stores history in a your device on your device, and ships no analytics or telemetry. LocalSum is a smaller privacy specialist with offline-first summarization. Most mainstream alternatives request broader permissions and route prompts through their own servers.

* Sources:Eightify, Glasp YouTube Summary, NoteGPT, Monica, Sider, HARPA AI, Sider Trustpilot reviews, Chrome extension statistics (chrome-stats.com).