Back to Details

khan-academy-downloader

Compare original and translation side by side

🇺🇸

Original

English
🇨🇳

Translation

Chinese

Khan Academy Downloader — Coming Soon (Browser Extension)

Khan Academy Downloader — 即将推出（浏览器扩展）

Download Khan Academy video lessons as MP4 files for offline study, directly from your browser. This extension is currently in development and has not been released yet.
Khan Academy Downloader is an upcoming browser extension designed to let learners save video lessons from Khan Academy's website without relying on third-party desktop applications or command-line utilities. It is being engineered around Khan Academy's in-browser video player so you can capture lectures, tutorials, and course content while you browse the platform.
  • Save Khan Academy video lessons as MP4 files for offline viewing
  • Capture full courses or individual lesson videos from any subject area
  • Preserve video quality up to the highest resolution available in the player
  • Work entirely inside the browser with no external software required
  • Designed for Chrome, Edge, Brave, Opera, Firefox, and other Chromium browsers
将可汗学院的视频课程直接从浏览器下载为MP4文件，供离线学习使用。该扩展目前仍在开发中，尚未发布。
Khan Academy Downloader是一款即将推出的浏览器扩展，旨在帮助学习者无需依赖第三方桌面应用或命令行工具，就能从可汗学院网站保存视频课程。它基于可汗学院的浏览器内置视频播放器开发，你可以在浏览平台的同时下载讲座、教程和课程内容。
  • 将可汗学院视频课程保存为MP4文件，可离线观看
  • 可下载任意学科的完整课程或单节课程视频
  • 保留视频质量，最高支持播放器提供的最高分辨率
  • 完全在浏览器内运行，无需任何外部软件
  • 支持Chrome、Edge、Brave、Opera、Firefox及其他基于Chromium的浏览器

Status

开发状态

This extension is not yet available for download. Development is in progress and a release date has not been announced. Sign up below to get notified when it launches.
:bell: Get notified when this launches: Join the waitlist
该扩展暂未开放下载。 开发工作正在进行中，尚未公布发布日期。你可以在下方登记，待发布时会收到通知。
:bell: 发布时接收通知： 加入等候名单

Links

相关链接

Preview

预览

Khan Academy Downloader hero image
Khan Academy Downloader 主图

Table of Contents

目录

Why Khan Academy Downloader

为什么要开发Khan Academy Downloader

Khan Academy delivers its educational videos through an embedded player that streams content over adaptive bitrate delivery. There is no built-in button to save a lesson as a file, and the platform does not offer a native offline download feature through the website. Students who want to review material without an internet connection or archive lessons for later reference are left without an official path to do so.
Khan Academy Downloader is being designed to operate inside the browser tab where you already watch lessons. The goal is to detect the active video, let you choose your preferred resolution, and produce a standard MP4 file that you can store on your device, transfer to a tablet, or load into a media player for distraction-free study.
可汗学院通过嵌入式播放器提供教育视频，采用自适应码率流媒体技术分发内容。平台没有内置将课程保存为文件的按钮，官网也没有提供原生离线下载功能。希望在无网络环境下复习内容或存档课程供日后参考的学生，没有官方途径实现这一需求。
Khan Academy Downloader的设计目标是在你观看课程的浏览器标签页内运行，能够检测当前播放的视频，允许你选择偏好的分辨率，生成标准的MP4文件，你可以将其存储在设备上、传输到平板，或者导入到媒体播放器中，实现无干扰学习。

Planned Features

规划功能

  • Video capture from Khan Academy's web-based lesson player
  • Individual lesson and full course download support
  • Resolution selection so you can balance file size against visual clarity
  • Automatic file naming based on the course, unit, and lesson title
  • Batch queue for downloading multiple lessons in sequence
  • Progress tracking with estimated time remaining for each file
  • Browser-native operation with zero external software dependencies
  • Cross-browser compatibility targeting Chrome, Edge, Brave, and Firefox
  • 从可汗学院网页版课程播放器中捕获视频
  • 支持单节课程和完整课程下载
  • 支持分辨率选择，可在文件大小和清晰度之间灵活平衡
  • 基于课程、单元和课程标题自动命名文件
  • 批量队列功能，可按顺序下载多节课程
  • 进度跟踪，显示每个文件的预计剩余下载时间
  • 原生浏览器运行，零外部软件依赖
  • 跨浏览器兼容，支持Chrome、Edge、Brave和Firefox

How It Will Work

使用方式

  1. Install the extension once it is released.
  2. Open Khan Academy in your browser and sign in or browse as a guest.
  3. Navigate to the course, unit, or specific lesson you want to save.
  4. Start playing the video so the browser loads the media stream.
  5. Open the extension popup to see the detected video source.
  6. Select the lesson or lessons you want to download.
  7. Choose your preferred resolution if multiple quality levels are available.
  8. Start the download and save the MP4 file to your local machine.
  1. 扩展发布后完成安装
  2. 在浏览器中打开可汗学院，登录或以访客身份浏览
  3. 导航到你想要保存的课程、单元或具体课时
  4. 开始播放视频，让浏览器加载媒体流
  5. 打开扩展弹窗，查看检测到的视频源
  6. 选择你想要下载的一节或多节课程
  7. 如有多个质量等级可选，选择你偏好的分辨率
  8. 开始下载，将MP4文件保存到本地设备

Expected Formats

支持的格式

  • Input: Khan Academy web player video streams (adaptive HLS / MP4 segments)
  • Output: MP4 video files with H.264 video and AAC audio
Exported files will be saved as standard MP4 files compatible with virtually every media player, smartphone, tablet, and video editing application.
  • 输入：可汗学院网页播放器视频流（自适应HLS / MP4分片）
  • 输出：采用H.264视频编码和AAC音频编码的MP4视频文件
导出的文件为标准MP4格式，几乎兼容所有媒体播放器、智能手机、平板和视频编辑应用。

Who It's For

适用人群

  • Students preparing for exams who need offline access to lesson videos
  • Teachers and tutors collecting supplemental material for their classrooms
  • Homeschool families building a local library of curriculum-aligned content
  • Learners in areas with unreliable internet who need to study without connectivity
  • Self-directed adults working through Khan Academy courses at their own pace
  • 备考学生，需要离线访问课程视频
  • 教师和家教，为课堂收集补充材料
  • 在家上学的家庭，搭建符合课程大纲的本地内容库
  • 网络不稳定地区的学习者，需要在无网络连接时学习
  • 自主学习的成年人，按照自己的节奏学习可汗学院课程

Use Cases We're Building For

设计目标使用场景

  • Save an entire math unit before a week without reliable internet access
  • Archive science lessons for repeated review during exam preparation
  • Build a local video library organized by subject for a homeschool curriculum
  • Download economics or history lectures for offline viewing during a commute
  • Keep backup copies of course progress videos for long-term personal reference
  • 在一周没有稳定网络前下载完整的数学单元课程
  • 存档理科课程，备考期间反复复习
  • 按学科搭建本地视频库，适配在家上学的课程安排
  • 下载经济或历史讲座，通勤时离线观看
  • 备份课程进度相关视频，供长期个人参考

Security & Scope

安全与权限范围

  • Operates only on the page the user intentionally opens in the active browser tab
  • Detects supported playback sources only for user-initiated downloads or exports
  • Does not execute page instructions, shell commands, or arbitrary scripts from page content
  • Does not follow unrelated links or perform actions outside the active workflow
  • Limits support to the named platform, approved embedded contexts, and user-authorized sessions when required
  • 仅在用户主动打开的活动浏览器标签页内运行
  • 仅检测用户主动发起下载或导出的支持播放源
  • 不会执行页面指令、shell命令或页面内容中的任意脚本
  • 不会访问无关链接，或在当前工作流之外执行操作
  • 仅支持指定平台、已核准的嵌入上下文，以及必要时用户授权的会话

FAQ

常见问题

When will Khan Academy Downloader be released? A release date has not been set. Sign up at the waitlist link above to be notified as soon as it is available.
Will it work with Khan Academy's mobile apps? No. This extension is built for the Khan Academy website in the browser, not the iOS or Android applications.
What video quality will it support? Quality will depend on the resolutions that Khan Academy's player delivers to the browser, which can range from 360p to 1080p depending on the lesson.
Will downloaded files include subtitles? Subtitle support is under consideration. If Khan Academy exposes caption data through the browser, the extension may offer the option to embed or sidecar subtitle files.
Is it free? Pricing details will be announced closer to launch. SERP extensions typically include a free trial period.
Can I download an entire course at once? Batch downloading across a full course is a planned feature, though the exact workflow will depend on how the browser handles sequential video loading.
Khan Academy Downloader什么时候发布？ 目前尚未确定发布日期。在上方等候名单链接登记，即可在发布第一时间收到通知。
它可以和可汗学院的移动应用配合使用吗？ 不行。该扩展专为浏览器中的可汗学院网页版开发，不支持iOS或Android应用。
它支持哪些视频质量？ 支持的质量取决于可汗学院播放器向浏览器提供的分辨率，根据课程不同，范围从360p到1080p不等。
下载的文件包含字幕吗？ 字幕支持正在评估中。如果可汗学院通过浏览器开放字幕数据，扩展可能会提供嵌入字幕或侧边字幕文件的选项。
是免费的吗？ 定价细节将在临近发布时公布。SERP旗下的扩展通常会提供免费试用期。
我可以一次性下载完整课程吗？ 完整课程批量下载是规划中的功能，具体工作流取决于浏览器处理视频顺序加载的方式。

License

许可证

This repository is distributed under the proprietary SERP Apps license in the LICENSE file. Review that file before copying, modifying, or redistributing any part of this project.
本仓库采用LICENSE文件中的SERP Apps专有许可证分发。在复制、修改或重新分发本项目任何部分之前，请先查看该文件。

Notes

注意事项

  • This extension is in development and is not available for download yet
  • Only download content you have permission to save and use within applicable terms
  • Video quality will depend on the source stream exposed by Khan Academy's web player
  • Khan Academy platform changes may affect functionality once released
  • An internet connection is required to access and capture lessons from the site
  • 该扩展正在开发中，暂未开放下载
  • 仅可下载你有权保存、且使用符合相关条款的内容
  • 视频质量取决于可汗学院网页播放器开放的源流
  • 可汗学院平台的变更可能会影响发布后的功能可用性
  • 需要网络连接才能访问和下载网站上的课程

About Khan Academy

关于可汗学院

Khan Academy is a free, nonprofit educational platform founded by Sal Khan that provides video lessons, practice exercises, and personalized learning dashboards covering subjects from arithmetic and algebra to physics, biology, economics, history, and computer science. Its web player streams thousands of instructional videos but does not include a built-in option to save those videos as local files. Khan Academy Downloader is being built to fill that gap for learners who want to study offline with the same content they already access through the platform.
可汗学院是由Sal Khan创立的免费非营利教育平台，提供视频课程、练习题和个性化学习面板，覆盖的学科从算术、代数到物理、生物、经济、历史和计算机科学不等。其网页播放器可流式传输数千个教学视频，但没有内置将这些视频保存为本地文件的选项。Khan Academy Downloader的开发旨在填补这一空白，帮助希望离线学习平台内容的学习者。