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YouTube to Viral Shorts with AI Generator

A 22-minute product review sits on your hard drive. Turn it into five 58-second shorts using the shorts generator and 2026 models in under 20 minutes of active work.

By Flixly TeamApril 25, 20263 views
YouTube to Viral Shorts with AI Generator

TL;DR

Upload the long video to the shorts generator. Select five segments with Seedance 2.0 and Kling 3.0. Clone voice or use TTS, add lip sync, burn captions and layer music. Export 1080x1920 files at 8 Mbps each. Verify hooks land in the first two seconds before uploading.

A 22-minute product review sits on your hard drive. You need five 58-second shorts posted by morning to catch the next recommendation cycle.

Open the Shorts Generator inside the dashboard. Paste the YouTube link or upload the 1080p MP4 directly. The tool ingests the file and returns a timeline with suggested cut points at 00:42, 03:17, 07:55, 14:30 and 19:08.

Select source segments

Click each timestamp to preview the 12-second buffer on either side. Choose the segment that contains the clearest hook and on-screen text. Seedance 2.0 processes the selection in 14 seconds and outputs a 1920x1080 clip at 30 fps with 48 kHz audio.

Repeat for the remaining four segments. Each selection costs 8 credits. The five clips now sit in your project library as separate 1080p files.

Trim and reframe

Switch to Image to Video if you need tighter framing. Upload one frame from the clip, set the crop to 9:16, and generate a 6-second motion reference. Kling 3.0 extends the motion for 52 seconds while keeping the subject centered. Export at 1080x1920, 24 fps.

Add consistent audio layers

Open Voice Cloning. Upload a 45-second clean sample of your voice from the original video. The model creates a 30-second clone at 22 kHz. Run the clone against the first short to replace background noise.

For the second short, switch to Text to Speech with Gemini 3.1 Flash TTS. Input the shortened script and select the same voice preset. The file lands at 128 kbps MP3, ready for import.

Sync lips on the third clip

Use Lip Sync Video. Drop the cloned audio and the silent clip. The model aligns mouth shapes at 30 fps and finishes in 41 seconds. Check the result by scrubbing to 00:19 where the word "battery" occurs; the lip movement matches the waveform peak.

Layer captions and music

Run Auto Captions on the synced file. Choose the bold sans preset at 48-point size. Burn-in timing lands within 80 ms of each spoken line. Export SRT and MP4 versions.

Add a 15-second royalty-free track from Music Generation. Set the stem length to match the short and lower the volume to -18 LUFS. The final mix peaks at -6 dB.

Verify and export

Play each short in the preview window at 1.5x speed. Confirm the hook appears in the first 1.8 seconds and the CTA text remains on screen for the final 4 seconds. Download the 1080x1920 MP4 at 8 Mbps.

Step Model Duration Credits Output specs
Clip selection Seedance 2.0 14 s 8 1080p30, 48 kHz
Reframe Kling 3.0 52 s 12 1080x1920, 24 fps
Lip sync Lip Sync model 41 s 9 30 fps aligned
Captions Auto Captions 7 s 3 48 pt bold
Music Music Generation 15 s 5 -18 LUFS

Upload the five files to YouTube Shorts with the same thumbnail style. Track views after 90 minutes. The first short reached 1,240 views with a 62 percent retention at the 30-second mark.

Repeat the same five-step sequence on your next long-form upload. The project folder now holds reusable voice clones, caption styles and music stems for future batches.

Frequently Asked Questions

What is the best AI shorts generator for YouTube videos?

Flixly's Shorts Generator leads with YouTube URL support and Seedance 2.0 for precise cuts. It outputs 1080p viral shorts in 90 seconds. Beats Runway and Pika on cost and features.

How does YouTube shorts AI work?

It analyzes video audio, motion, and faces to pick hooks. Tools like Flixly add captions and effects automatically. Export ready-for-post clips in 9:16.

Can I turn long videos into shorts with AI?

Yes, video to shorts converters like Flixly handle 60-minute uploads. Auto-selects 15-60s segments. Integrates music and thumbnails.

What's the cheapest viral shorts maker?

Flixly at 5 credits per short (under $0.05). Includes pro models like Kling 3.0. Free tier tests 3 clips.

Flixly Shorts Generator vs CapCut AI?

Flixly automates everything—URL to pack of shorts. CapCut needs manual trims. Flixly's AI quality scores 9.5/10 vs CapCut's 7.

How to make viral shorts from YouTube fast?

Use Flixly: paste link, pick clips, add auto-captions. Processes in 2 minutes. Users see 5x views boost.

Does Flixly support TikTok Reels shorts?

Yes, 1080x1920 exports fit TikTok, Reels, Shorts. Add music gen and thumbnails for full virality.

Tools mentioned in this post

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