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nicovideo-downloader

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NicoVideo Downloader — Coming Soon (Browser Extension)

NicoVideo Downloader — 即将推出（浏览器扩展）

Download videos from nicovideo.jp and save them as MP4 files directly from your browser. This extension is currently in development and has not been released yet.
NicoVideo Downloader is an upcoming browser extension purpose-built for the nicovideo.jp domain and its classic player interface. Rather than trying to cover every corner of the broader Niconico ecosystem, this extension zeroes in on the original NicoVideo site, letting you grab videos during playback and store them locally as standard MP4 files without leaving the browser.
  • Detect and capture videos playing on nicovideo.jp pages
  • Save video content as MP4 files to your local machine
  • Work within the classic NicoVideo player interface
  • Operate entirely inside the browser with no external software required
  • Designed for Chrome, Edge, Brave, Opera, Firefox, and other Chromium browsers
直接从浏览器下载nicovideo.jp的视频并保存为MP4文件。本扩展目前处于开发阶段，尚未发布。
NicoVideo Downloader是一款专为nicovideo.jp域名及其经典播放器界面打造的即将上线的浏览器扩展。本扩展并未试图覆盖Niconico生态的方方面面，而是聚焦于原生NicoVideo站点，让你可以在播放视频时无需离开浏览器，直接将视频抓取并以标准MP4格式存储到本地。
  • 检测并捕获nicovideo.jp页面上正在播放的视频
  • 将视频内容保存为MP4文件到你的本地设备
  • 适配经典NicoVideo播放器界面
  • 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Chromium内核浏览器

Status

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
**本扩展暂未开放下载。**开发正在进行中，尚未公布发布日期。你可以在下方登记，上线后将第一时间收到通知。
:bell: 上线时接收通知： 加入等候名单

Links

链接

Preview

预览

NicoVideo Downloader hero image
NicoVideo Downloader 宣传图

Table of Contents

目录

Why NicoVideo Downloader

为什么选择NicoVideo Downloader

NicoVideo serves its content through a streaming player that does not expose a direct download link for viewers. Videos are delivered via adaptive streaming segments, and the site's comment overlay system adds another layer of complexity for anyone trying to save a local copy. Right-clicking the player offers no save option, and browser caching does not produce a usable file.
Existing tools that target Niconico broadly often struggle with the specific page structures and player variations found on the nicovideo.jp domain. NicoVideo Downloader is being engineered from the ground up to handle the classic NicoVideo player, reading the video source from the active tab and assembling a complete MP4 file that you can keep, transfer, or watch offline without depending on a network connection or a logged-in session.
This extension is separate from the niconico-downloader project. While that tool addresses the wider Niconico platform and its various subdomains, NicoVideo Downloader is scoped exclusively to nicovideo.jp URLs and the classic player interface, allowing for tighter integration and more reliable detection of video sources on those pages.
NicoVideo通过流媒体播放器提供内容，不会向观众暴露直接下载链接。视频通过自适应流媒体分片传输，站点的评论叠加系统也给想要保存本地副本的用户增加了另一层复杂度。右键点击播放器没有保存选项，浏览器缓存也无法生成可用的文件。
现有的通用Niconico下载工具往往无法适配nicovideo.jp域名特有的页面结构和播放器版本。NicoVideo Downloader完全从零开始构建，专为经典NicoVideo播放器设计，可以读取当前标签页的视频源，组装成完整的MP4文件，你可以留存、传输或者离线观看，无需依赖网络连接或者登录状态。
本扩展与niconico-downloader项目相互独立。那款工具面向更广泛的Niconico平台及其各类子域名，而NicoVideo Downloader仅适配nicovideo.jp链接和经典播放器界面，可以实现更深度的集成，对该站点的视频源检测也更加可靠。

Planned Features

计划中的功能

  • Video detection on nicovideo.jp pages during active playback
  • MP4 output for broad compatibility across devices and media players
  • Support for the classic NicoVideo player interface and its page layout
  • Resolution selection when the source offers multiple quality tiers
  • Filename generation based on video title and metadata from the page
  • Download progress indicator inside the extension popup
  • Queue system for saving multiple videos in sequence
  • Cross-browser compatibility targeting Chrome, Edge, Brave, and Firefox
  • 在播放过程中自动检测nicovideo.jp页面上的视频
  • 输出MP4格式，适配各类设备和媒体播放器
  • 支持经典NicoVideo播放器界面和对应页面布局
  • 当源文件提供多档画质时支持分辨率选择
  • 根据视频标题和页面元数据自动生成文件名
  • 扩展弹窗内显示下载进度
  • 队列系统支持按顺序批量保存多个视频
  • 跨浏览器兼容，支持Chrome、Edge、Brave和Firefox

How It Will Work

工作方式

  1. Install the extension from your browser's extension store once it is released.
  2. Navigate to any video page on nicovideo.jp.
  3. Begin playback so the browser loads the video stream through the classic player.
  4. Click the extension icon in the toolbar to open the popup panel.
  5. The extension detects the active video source and displays its title and available resolutions.
  6. Select your preferred resolution if more than one option is available.
  7. Press the download button to begin saving the video as an MP4 file.
  8. The file is written to your default downloads folder or a location you choose.
  1. 扩展发布后从你的浏览器应用商店安装该扩展
  2. 访问nicovideo.jp上的任意视频页面
  3. 开始播放视频，让浏览器通过经典播放器加载视频流
  4. 点击工具栏中的扩展图标打开弹窗面板
  5. 扩展会检测当前活跃的视频源，展示视频标题和可用分辨率
  6. 如果有多档画质可选，选择你偏好的分辨率
  7. 按下下载按钮开始将视频保存为MP4文件
  8. 文件将被写入你的默认下载文件夹或者你选择的存储位置

Expected Formats

支持的格式

  • Input: NicoVideo streaming segments served through the nicovideo.jp classic player (typically HLS or MPEG-DASH)
  • Output: MP4 (H.264 video with AAC audio)
Exported files will play in virtually any media player, mobile device, or video editor without additional conversion steps.
  • 输入：nicovideo.jp经典播放器提供的NicoVideo流媒体分片（通常为HLS或MPEG-DASH格式）
  • 输出：MP4（H.264视频编码+AAC音频编码）
导出的文件几乎可以在所有媒体播放器、移动设备或者视频编辑器中直接播放，无需额外转换步骤。

Who It's For

适用人群

  • Fans of Japanese content creators who publish primarily on NicoVideo
  • Viewers who want offline access to videos they have already watched on nicovideo.jp
  • Language learners studying Japanese through NicoVideo content
  • Researchers archiving cultural or historical video material hosted on the platform
  • Anyone who prefers local video files over streaming-only access
  • 主要在NicoVideo发布内容的日本内容创作者的粉丝
  • 想要离线观看已在nicovideo.jp上看过的视频的用户
  • 通过NicoVideo内容学习日语的语言学习者
  • 存档该平台上文化或历史视频资料的研究人员
  • 偏好本地视频文件而非仅流媒体访问的所有用户

Use Cases We're Building For

设计的适用场景

  • Save a favorite music video or live performance from nicovideo.jp for offline viewing
  • Archive educational or documentary content before it is removed by the uploader
  • Build a local collection of videos for study, reference, or personal enjoyment
  • Download content for viewing during commutes or travel without reliable internet
  • Keep backup copies of your own uploaded videos hosted on the platform
  • 保存nicovideo.jp上喜欢的音乐视频或者演出现场用于离线观看
  • 在上传者删除内容前存档教育类或纪录片类内容
  • 搭建本地视频收藏库用于学习、参考或者个人欣赏
  • 下载内容用于通勤或者网络不稳定的旅行途中观看
  • 备份你自己上传到该平台的视频副本

Security & Scope

安全与适用范围

  • 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
  • 仅在用户主动在当前浏览器标签页打开的页面上运行
  • 仅为用户主动发起的下载或导出操作检测支持的播放源
  • 不会执行页面内容中的页面指令、shell命令或者任意脚本
  • 不会跳转无关链接，也不会在当前工作流之外执行操作
  • 仅支持指定平台、经过认证的嵌入上下文，以及必要时用户授权的会话

FAQ

常见问题

When will NicoVideo 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.
How is this different from the niconico-downloader extension? The niconico-downloader targets the broader Niconico platform and its various subdomains. NicoVideo Downloader focuses specifically on nicovideo.jp URLs and the classic player interface, providing tighter integration and more reliable video detection for that domain.
What video quality will it support? Output quality will depend on what nicovideo.jp delivers to the browser, which varies based on the video and your account type. The extension will let you pick from available quality tiers when more than one is offered.
Will it capture the scrolling comment overlay? The initial release will save the underlying video without the comment overlay. Comment-layer capture may be explored in a future update.
Is it free? Pricing details will be announced closer to launch. SERP extensions typically include a free trial period.
Do I need a NicoVideo account? Many videos on nicovideo.jp require a logged-in session to play. You will need to be signed in to your account so the browser can load the video stream for the extension to capture.
NicoVideo 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上线后第一时间收到通知。
这款扩展和niconico-downloader扩展有什么区别？ niconico-downloader面向更广泛的Niconico平台及其各类子域名。NicoVideo Downloader专门聚焦于nicovideo.jp链接和经典播放器界面，对该域名可以实现更深度的集成和更可靠的视频检测。
它支持什么画质的视频？ 输出画质取决于nicovideo.jp向浏览器传输的画质，会根据视频和你的账号类型有所不同。当有多档画质可选时，扩展会允许你选择对应的档位。
它会捕获滚动弹幕叠加层吗？ 初始版本只会保存底层视频，不包含弹幕叠加层。后续更新可能会考虑添加弹幕捕获功能。
这款扩展是免费的吗？ 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。
我需要有NicoVideo账号吗？ nicovideo.jp上的很多视频需要登录会话才能播放。你需要登录你的账号，让浏览器可以加载视频流，扩展才能捕获。

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.
本仓库遵循LICENSE文件中的SERP Apps专有许可证分发。在复制、修改或者重新分发本项目的任何部分之前，请仔细查阅该文件。

Notes

注意事项

  • This extension is in development and is not available for download yet
  • Only download content you own or have explicit permission to save
  • Video quality will depend on the source stream served by nicovideo.jp
  • Platform changes on NicoVideo may affect functionality once the extension is released
  • A nicovideo.jp account and internet connection will be required for video playback and detection
  • 本扩展处于开发阶段，目前暂未开放下载
  • 仅下载你拥有所有权或者获得明确授权保存的内容
  • 视频画质取决于nicovideo.jp提供的源流
  • NicoVideo的平台变更可能会影响扩展发布后的功能可用性
  • 视频播放和检测需要拥有nicovideo.jp账号和网络连接

About NicoVideo

关于NicoVideo

NicoVideo, accessible at nicovideo.jp, is the original video-sharing domain of Niconico Douga, one of Japan's most popular video platforms. Launched in 2006, it became well known for its distinctive scrolling comment system that overlays viewer reactions directly on top of videos in real time. The platform hosts a vast library of user-generated content spanning music, gaming, animation, vlogs, and live events. While the Niconico brand has expanded to include live streaming and other services across additional domains, nicovideo.jp remains the core destination for uploaded video content and the classic viewing experience. NicoVideo Downloader is being built to give users of that specific domain a simple, browser-based way to save videos locally as MP4 files.
NicoVideo可通过nicovideo.jp访问，是日本最受欢迎的视频平台之一Niconico Douga的原生视频分享域名。该平台于2006年上线，以其特色滚动弹幕系统闻名，观众的评论可以实时直接叠加在视频上方。平台托管了海量用户生成内容，涵盖音乐、游戏、动画、vlog和 live 活动等。尽管Niconico品牌已经扩展到直播和其他跨域名服务，nicovideo.jp仍然是上传视频内容和经典观看体验的核心目的地。我们打造NicoVideo Downloader的目的是为该特定域名的用户提供一种简单的、基于浏览器的方式，将视频本地保存为MP4文件。