Kastor – All Video Downloader

Kastor — All Video Downloader: Save Videos in MP4, MKV, and More

What it does

Kastor is a video downloading tool that extracts and saves streaming video content from many websites to local files. It typically offers multiple output formats (MP4, MKV, WebM), selectable resolutions, and options to download audio-only tracks.

Key features

• Format choices: Export to MP4, MKV, WebM and sometimes audio formats (MP3, M4A).
• Quality selection: Pick resolution/bitrate (e.g., 1080p, 720p, 480p) when available.
• Batch downloads: Queue multiple videos or entire playlists.
• Browser integration: Extensions or one-click capture from supported sites.
• Subtitle extraction: Download embedded or external subtitle files (SRT) when present.
• Conversion: Built-in conversion to change container/codec after download.
• Resume support: Continue interrupted downloads.
• Simple UI: Drag-and-drop or URL-paste workflows.

Typical workflow

1. Copy video page URL.
2. Paste into Kastor or click the browser extension.
3. Choose format (e.g., MP4 or MKV), resolution, and audio/subtitle options.
4. Start download and monitor progress.
5. Convert or play the saved file locally.

Format differences (brief)

• MP4: Widely compatible, good for devices and streaming.
• MKV: Flexible container supporting multiple audio/subtitle tracks and advanced codecs.
• WebM: Open format optimized for web use; smaller files with VP9/AV1 codecs.
• MP3/M4A (audio): Smaller files for music/podcasts.

Legal and ethical note

Downloading copyrighted content without permission may violate terms of service or local law. Use Kastor only for content you own, have permission to download, or that is clearly allowed for offline use.

Quick tips

• Prefer MP4 for device compatibility; use MKV if you need multiple tracks/subtitles.
• Check site-specific limits—some streaming services use DRM that prevents downloading.
• Use a download folder with plenty of space; high-resolution files can be large.