# Highlight Sync

> Free, privacy-first web highlighter with sync and review and export in various formats (markdown, csv, obsidian, notion and more).

Canonical page: [https://chrome-stats.com/d/highlight-sync](https://chrome-stats.com/d/highlight-sync)

## Overview

- **ID:** `highlight-sync`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** fazorboy
- **Category:** privacy-security,bookmarks
- **Daily users:** 1
- **Version:** 1.0.0
- **Last updated:** 2026-04-24
- **First published:** 2026-04-21
- **Size:** 620 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/highlight-sync/)
- **Website:** [https://github.com/bhayanak/highlight-sync](https://github.com/bhayanak/highlight-sync)

## Description

Features

| Feature | Description |
|---------|-------------|
| <strong>Web Highlighting</strong> | Select text on any page → pick color → auto-save |
| <strong>Local-First Storage</strong> | All data in IndexedDB — no cloud required |
| <strong>Tags &amp; Search</strong> | Tag highlights by topic, full-text search |
| <strong>Spaced Repetition</strong> | Daily review digest using SM-2 algorithm |
| <strong>Multi-Format Export</strong> | Markdown, CSV, JSON, Obsidian, Notion, Anki |
| <strong>Optional Sync</strong> | GitHub Gist (free) or self-hosted endpoint |
| <strong>Cross-Browser</strong> | Chrome + Firefox (Manifest V3) |
| <strong>Privacy-First</strong> | Zero analytics, zero tracking, fully open-source |

Usage
<ol><li><strong>Highlight text</strong> — Select text on any page → floating color toolbar appears → click a color</li><li><strong>Keyboard shortcut</strong> — <code>Ctrl+Shift+H</code> (Windows/Linux) or <code>Cmd+Shift+H</code> (Mac) to highlight with default yellow</li><li><strong>Right-click</strong> — Select text → right-click → "Highlight Selection" → pick color</li><li><strong>Search</strong> — Click extension icon → Search tab → type to search across all highlights</li><li><strong>Tags</strong> — Click extension icon → Tags tab → create and manage tags</li><li><strong>Review</strong> — Click extension icon → Review tab → review highlights with spaced repetition</li><li><strong>Export</strong> — Click extension icon → Export tab → choose format and download</li><li><strong>Sync</strong> — Click extension icon → Settings tab → configure GitHub Gist or self-hosted sync</li></ol>
Export Formats

| Format | Details |
|--------|---------|
| <strong>Markdown</strong> | Grouped by page/date/tag with metadata |
| <strong>Obsidian</strong> | Frontmatter YAML, <code>&gt; [!quote]</code> callouts, <code>[[wikilinks]]</code> |
| <strong>Notion</strong> | Notion-compatible markdown with database properties |
| <strong>Anki</strong> | Tab-separated: front=context, back=highlight |
| <strong>CSV</strong> | Standard CSV with all fields |
| <strong>JSON</strong> | Raw JSON array for custom processing |

Sync Options

| Provider | How It Works |
|----------|-------------|
| <strong>GitHub Gist</strong> | Stores highlights as JSON in a private gist (free, encrypted PAT) |
| <strong>Self-hosted</strong> | POST/GET to your REST endpoint (HTTPS required) |
| <strong>None</strong> | Fully local — zero network requests |

## Rankings

- #89,997 — Overall
- #153 — sync

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `contextMenus`
- `alarms`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/highlight-sync)