Windows
Download-SIU · PC
The full engine: up to 4K / 240 FPS, full seasons and lossless audio — everything processed locally on your computer.
Live for Windows
Every video you love,
Every video you love,
in the quality it deserves.
Paste a link. Choose a quality. Press download. Download SIU pulls video and audio from 56+ websites in up to 4K / 240 FPS, extracts lossless audio, and can walk an entire series episode by episode — all processed locally on your own PC.
56+
Supported sites
4K
Max resolution
240
FPS ceiling
2847
Active users
24/7
Support
Three apps, one license
Pick where you want to download
The desktop downloader, the watermark remover and the Android app all share the same SIU account. Tap any of them — the download starts and its page opens so you can see everything it does.
Windows
WaterClean-SIU
Remove watermarks and logos from video with four engines — from instant filters to local AI that rebuilds what was behind the mark.
Android
Download-SIU · APK
The whole downloader on your phone: paste any link, save up to 4K, and send heavy captures to your PC when a site won't cooperate.
Capabilities
Built for people who care
Built for people who care
about the output file
Not a browser extension. Not a website that re-encodes your video into mush. A real desktop application with a real encoder behind it.
Core
Video & audio from a single link
Paste the address of a video — or of the page it sits on — and get it back in the quality you picked, wrapped in MKV or MP4. Single files, queued batches, or an entire playlist in one pass.
- Resolution picker from 144p all the way to 4K
- Frame rate locked to the source, or forced to 30 / 60 / 120 / 240
- Keeps every audio track and subtitle stream the source offers
- Live queue with per-item progress and a full log panel
Lossless audio extraction
Pull the audio out on its own in MP3, M4A, WAV or FLAC, and set the bitrate and sample rate yourself. Perfect for archiving a music library properly.
Whole series, unattended
Where the site allows it, SIU walks from one episode to the next by itself and grabs the full season. Start it, close the lid, come back to a finished folder.
Tuned to your hardware
A CPU-thread slider, concurrency limits and live CPU / RAM / network meters let you decide how much of your machine the encoder is allowed to take.
Your links stay yours
URLs are resolved locally by the bundled yt-dlp and FFmpeg. We never receive the links you paste, and we never log what you download. Our servers only know your license.
Always current
Updates that keep up with the web
Streaming sites change their players constantly. SIU ships updates continuously to track those changes, and the app checks for new versions on its own — so a site that broke last month is usually working again the next time you open it.
New
Send from your phone, download on your PC
Pair the new Download-SIU Android app with this PC and hand it any link from your phone. When a site won't let a phone grab a video directly, the app sends the link here and your computer captures it at full quality — with the resolution, FPS, format and audio you chose on the phone. One SIU license covers both, and the app shows you the moment the PC is done.
Clean metadata, if you want it
A single switch strips the embedded title, author and comment tags from your downloads — off by default, and it only stays on if you turn it on. It applies to captures the app re-encodes and to anything it hands to the download queue.
New
Convert the files already on your PC
Point it at a video or audio file you already have and change its format, resolution, frame rate, codec or bitrate — MP4, MKV, MOV, AVI, WebM, FLAC, WAV, MP3 and more. If the file already matches the container you want, SIU rewraps it in seconds instead of re-encoding. Optional GPU acceleration, batch conversion with saved profiles, and the same metadata switch as the rest of the app.
- Instant remux when no re-encode is needed, full control when it is
- Runs independently of downloads — convert while something else downloads
- Batch queue with named, reusable presets
Two engines
Fast by default.
Fast by default.
Obsessive when you need it.
Switch between them with one click, at any time.
ECO Mode
RecommendedThe file exactly as the source has it — just rewrapped into MKV or MP4. No re-encoding, no quality loss, almost no work for your CPU. This is the fastest path from link to finished file, and the one most people should use.
- Original quality, byte for byte
- Finishes in seconds instead of minutes
- Barely registers on your CPU
PC load
Very low
PRO Mode
Full controlEvery knob exposed: resolution, frame rate, container, encoder preset, which audio tracks to keep, which subtitles to burn or embed, how many threads to spend. For when the default is not what you want.
- Presets for Standard, Gameplay, Movie and Anime
- Pick exact resolution and FPS independently
- Choose audio tracks and subtitle streams per file
PC load
High
Currently tested and supported on Windows. macOS and Linux builds are in progress.
How it works
Three steps. That's the whole thing.
Copy the link
Right-click the video and copy its address — or just copy the address of the page the video is playing on. Both work.
Paste it into SIU
Drop it into the link field, pick ECO or PRO, and set the quality if you care. Defaults are already sensible.
Press download
The queue takes over. Watch the progress bar, or go do something else — the file lands in the folder you chose.
Make it yours
Five themes. One click apart.
The whole interface re-skins instantly — every panel, meter and button. Pick the one that matches the room you work in.
Cyan
Cold, technical, high contrast. Pure cyberpunk console.
Use the arrows, the thumbnails or your arrow keys. Swipe on touch. It pauses when you hover.
From the people using it
4.8 out of 5, across 2,847 users
Carlos M.
★★★★★
Downloads 4K without a single hiccup. The interface is genuinely beautiful and it never gets in my way. Worth every cent of the Lifetime plan.
Verified purchase
47 found this helpful
María L.
★★★★★
I'm a video editor and I pull clips all day long. PRO mode with batch downloads saved me hours in the first week. Support answered me in minutes.
Verified purchase
56 found this helpful
Andrea R.
★★★★★
Tried the free trial and bought the annual plan before it ran out. The FLAC extraction is exactly what my music collection needed.
Verified purchase
32 found this helpful
Questions
Things people ask before buying
All major cards and wallets, handled end to end by Stripe — Visa, Mastercard, American Express and more. We never see or store your card details.
Yes. Checkout happens entirely on Stripe's PCI-DSS certified infrastructure. Your card number and CVC never touch our servers — we only ever receive a confirmation that the payment succeeded.
Immediately, either way. The free trial is activated from a button inside the app: press it and the 5 days unlock straight away — no form, no email, no card. If you buy a plan, the licence code appears on screen the moment payment is confirmed and a copy is emailed to you automatically.
56 at the time of writing — the ones people and the media actually use. A few require you to be signed in for security reasons, and DRM-protected platforms are deliberately excluded for legal and privacy reasons. The rest are plain copy and paste.
Right-click the video and copy its URL, or simply copy the address of the page it's on. Paste it into SIU and press download. That's the entire workflow.
Yes — each license is bound to a single PC through a 16-character hardware code you'll find in the app under Settings. If you renew while time is still left on your current license, the new time is added on top of what you have. We never reduce time you already paid for.
Try it for five days.
No card, no catch.
Install it, run a few downloads, and decide with real files in front of you. If it isn't better than what you're using now, you've lost nothing.
Windows 10 & 11 · macOS and Linux coming soon