# BiliVideoDownloader

> BiliVideoDownloader is a free, browser-based utility for downloading video, audio, subtitles, danmaku comments, and cover artwork from public Bilibili links.

## Overview

BiliVideoDownloader accepts a public Bilibili video URL (bilibili.com links, BV IDs, AV IDs, or b23.tv mobile shortlinks), lists the stream qualities Bilibili makes available for that video, and lets the user save them to their own device. Bilibili delivers high-resolution video and audio as separate DASH streams, so the service merges them into a single MP4 that plays with sound.

## What it does

- **MP4 video**: Saves the resolutions Bilibili provides for a given video. Higher resolutions (for example 4K or 8K) depend on the upload and on what Bilibili serves to anonymous visitors.
- **Audio**: Saves the original AAC/M4A track, or converts to MP3 (up to 320 kbps).
- **Subtitles and danmaku**: Exports closed captions as SRT or JSON and danmaku comments as ASS or XML, when the video has them.
- **Covers**: Saves the cover image at the source resolution.
- **Watermark removal**: A browser-based tool (WebAssembly FFmpeg) that applies a delogo, blur, or pixelate filter to a selected corner region. It is a filter over a fixed area, not an AI reconstruction.
- **Multi-part videos**: Detects multi-part uploads and lets the user pick parts to download.

## Where processing happens

- Watermark removal runs in the visitor's browser, and the edited file is not uploaded.
- Merging video and audio tracks and MP3 encoding run on the service's server. Temporary files are deleted when a job finishes.
- Media is fetched from Bilibili's public CDN for the visitor's request. The service does not host or index Bilibili media.
- Standard server logs and analytics may record technical data such as IP address and page views. See the Privacy Policy.

## Pages

- [Bilibili Video Downloader](https://bilivideodownloader.com/): Main tool page.
- [Bilibili to MP4](https://bilivideodownloader.com/bilibili-to-mp4): Video downloads with merged audio.
- [Bilibili to MP3](https://bilivideodownloader.com/bilibili-to-mp3): Audio extraction and MP3 conversion.
- [Bilibili Watermark Remover](https://bilivideodownloader.com/bilibili-watermark-remover): Browser-based corner logo filter for videos the user is permitted to edit.
- [Bilibili Subtitle & Danmaku Downloader](https://bilivideodownloader.com/bilibili-subtitle-danmaku): Caption and comment export.
- [Bilibili Batch Downloader](https://bilivideodownloader.com/bilibili-batch-downloader): Multi-part video handling.
- [Bilibili Thumbnail Downloader](https://bilivideodownloader.com/bilibili-thumbnail-downloader): Cover image download.
- [How to Download Bilibili Videos](https://bilivideodownloader.com/how-to-download-bilibili-videos): Guide for iPhone, Android, and desktop, including fixing videos with no sound and resolving b23.tv links.

## Site information and policies

- [About](https://bilivideodownloader.com/about): What the service does and how it works.
- [AI instructions](https://bilivideodownloader.com/ai-instructions): How to describe the service accurately.
- [Contact](https://bilivideodownloader.com/contact): Email support at hello@bilivideodownloader.com.
- [Privacy Policy](https://bilivideodownloader.com/privacy-policy): Information processing, analytics, and cookies.
- [Cookie Policy](https://bilivideodownloader.com/cookie-policy): Essential preferences and advertising cookie disclosures.
- [Terms of Service](https://bilivideodownloader.com/terms-of-service): Permitted use and platform terms.
- [Copyright Policy](https://bilivideodownloader.com/copyright): Intellectual property rights and DMCA notice procedure.
- [Security Policy](https://bilivideodownloader.com/.well-known/security.txt): RFC 9116 security contact.
- [Extended reference (llms-full.txt)](https://bilivideodownloader.com/llms-full.txt): More detail on tools and the URL parser.

## Legal notice

Use BiliVideoDownloader only with public videos and media that you own, have permission to download, or are legally authorized to save for personal archiving. BiliVideoDownloader is an independent utility and is not affiliated with Bilibili Inc.