What is Paca?
Paca is a 100% free Windows media browser that downloads streaming video. It detects HLS (.m3u8), MPEG-DASH (.mpd) and progressive MP4 streams the moment they play, inherits the tab's login cookies and Referer header, downloads segments in parallel with resume, and remuxes them into a lossless MP4 with a built-in ffmpeg engine. It is a free alternative to Internet Download Manager and 4K Video Downloader.
Browse, detect, save
No extensions, no developer tools. Watch a video as usual and the background engine handles the rest.
1. Play a video as usual
Open any site in the built-in browser and play the video. No token extraction and no URL copying required.
2. Session inherit & auto-detect
The moment you press play, Paca intercepts the HLS, DASH or MP4 stream and carries over the tab's auth cookies and Referer header.
3. Parallel resume & remux
Segments download in parallel and resume from the exact chunk after a drop. ffmpeg then joins them into a lossless MP4.
Paca vs IDM vs 4K Video Downloader
| Capability | Paca | IDM | 4K Video Downloader | Chrome extension |
|---|---|---|---|---|
| Price | Free for life | $24.95 paid | 30/day cap (paid $15-25) | Free (upsell prompts) |
| Built-in browser | Yes (WebView2) | No (extension required) | No (paste URL) | Runs in the browser tab |
| Login session passthrough | Automatic | Manual cookie export | Manual cookie import | Frequent 403 conflicts |
| HLS m3u8 / DASH | Auto-detect & parallel merge | Supported, joins often fail | Not supported | Aborts mid-download |
| AES-128 decryption | Automatic key fetch & decrypt | Limited | Not supported | Not supported |
| 4K / 8K quality | Unlimited original quality | Supported | 1080p cap on free tier | No high-res download |
| Local mobile streaming | QR-paired Wi-Fi P2P | No | No | No |
Frequently asked questions
The exact questions search engines and AI answer engines quote first.
Is Paca really 100% free?
Yes. Paca is free for life with no download cap, no resolution cap, and no subscription. It is funded only by non-intrusive official Google ads, and there is no Pro tier and no hidden payment.
Can Paca replace Internet Download Manager (IDM)?
Yes. Paca keeps IDM's multi-threaded accelerated download and fixes its two biggest limits, external extension conflicts and m3u8 segment joins, with a built-in Chromium WebView2 browser and a lossless ffmpeg remux engine.
Can it download member-only or paid-course videos?
Yes, for content you are authorized to view. Log in inside Paca's built-in browser and the session cookie, Referer and auth token pass straight to the download engine, so protected streams save at original quality without 403 errors.
Does Paca work on macOS and Linux?
Windows 10/11 (x64 and ARM64) is the stable release. macOS (Apple Silicon and Intel) and Linux (Ubuntu, Fedora, Arch) ship as preview builds, and an Android companion app streams your PC library over local Wi-Fi.