Vidulk is an AI-powered mobile app for iOS and Android that turns long videos and audio into viral short-form clips. It also includes an AI image studio and professional caption editor.

How does AI clip detection work?

Import a video or paste a link — Vidulk transcribes the audio using AI speech recognition that supports 99 languages, then analyzes the transcript to find the most engaging moments. Each clip is scored by virality potential and categorized as Insight, Story, Funny, Tactical, Controversial, or Emotional.

What languages does Vidulk support?

Vidulk supports speech recognition in 99 languages including English, Spanish, French, German, Korean, Japanese, Chinese, Arabic, Hindi, Portuguese, and many more. The app interface is available in over 30 languages. Language is detected automatically.

What caption and editing features are available?

Vidulk includes 7 caption styles (Highlight, Karaoke, Typewriter, Minimal, Bold Pop, Gradient, and more), customizable fonts, colors, and animations. Export in multiple aspect ratios (9:16 for Shorts/Reels, 1:1 Square, 4:5 Portrait, 16:9 Landscape) at up to 4K resolution.

What is the AI Image Studio?

AI Studio lets you generate thumbnails and images from text prompts with 6 artistic styles including Realistic, Illustrated, Abstract, Minimalist, Anime, and Watercolor. It also includes an Image Enhancer that upscales images 2x or 4x. All processing happens on-device for privacy.

What content types does Vidulk work with?

Vidulk is optimized for podcasts, YouTube videos, interviews, lectures, gaming highlights, vlogs, music, sports, and news content. Import from YouTube, TikTok, Instagram, Twitter/X, Facebook, or upload directly from your camera roll.

Does Vidulk work with long videos?

Yes. Vidulk handles videos of any length. Short videos are processed on-device, while longer videos (over 5 minutes) are processed using server-side AI for faster and more reliable results.

What platforms is Vidulk available on?

Vidulk is available on both iOS (App Store) and Android (Google Play Store). The app interface is available in over 30 languages.

Yes. Video transcription and AI image processing happen on-device. Your videos are not stored on external servers permanently. You can delete your account and all data at any time from the app settings.

Can I use Vidulk for audio-only content like podcasts?

Yes. Vidulk fully supports audio-only content. Import MP3, M4A, WAV, or other audio files. AI detects the best moments and you can add AI-generated background images or choose from 1,200+ built-in backgrounds to create video clips from audio.

Can Vidulk remove captions or subtitles from videos?

Yes. Vidulk includes AI-powered caption removal that automatically detects and removes burned-in captions and subtitles from your videos before clipping. It works best with dynamic/moving captions like those on TikTok, Reels, and YouTube. Enable it with a simple checkbox when importing your video. Processing takes 7-20 minutes and uses additional credits based on video length.

How do I export clips from Vidulk?

After editing, choose your aspect ratio (9:16, 1:1, 4:5, or 16:9), resolution (720p, 1080p, or 4K), and export. Clips are saved directly to your Photos library and can be shared instantly to any platform.

How to Turn OBS Recordings Into Facebook Reels Clips

To share the best moments from your OBS recordings as Facebook Reels, you need to create vertical, captioned clips sized to Facebook's recommended specs. Vidulk's AI Clipper streamlines this process in a few steps.

OBS Recording to Facebook Reels Clips: How to Convert

1. Prepare Your OBS Recording for Editing

First, make sure your OBS output is saved in high quality (MKV or MP4). If your file is in MKV, remux it to MP4 using OBS’s built-in tool for compatibility with most video editors and apps, including Vidulk.

2. Understand Facebook Reels Video Requirements

Aspect ratio: 9:16 (vertical) is recommended for full-screen viewing.
Resolution: 1440x2560 is optimal, but 1080x1920 is also widely used.
Length: Since June 2025, Facebook accepts any length or format, but short clips (30 - 60 seconds) perform best.
Captions: Recommended for accessibility and engagement. Facebook Reels ads do not auto-caption; you must add them manually or with a tool like Vidulk.

3. Use Vidulk to Automatically Create Reels Clips

Download the Vidulk app (iOS or Android).
Upload your remuxed MP4 OBS recording to Vidulk.
The AI Clipper analyzes the full video, finds highlight moments, and converts them into short, vertical (9:16) clips.
Vidulk automatically adds accurate captions, sized and formatted for Facebook Reels.
Export the finished clips in the recommended resolution, ready for upload.

4. Upload Your Clips to Facebook Reels

Transfer the exported clips from your device to your desktop or upload directly from your phone.
Open Facebook and select the Reels upload option.
Add any extra descriptions, hashtags, or music as desired.
Publish your reel - your optimized, captioned clip will display correctly on Facebook’s vertical feed.

Vidulk's AI clipper (free to start, iOS + Android) finds the best moments in a long video and exports captioned vertical clips sized for the destination.

Try Vidulk

FAQ

How do I remux an MKV OBS recording to MP4?

Open OBS, go to File > Remux Recordings, select your MKV file and convert it to MP4 for easier editing and uploading.

What is the best aspect ratio for Facebook Reels?

The recommended aspect ratio for Facebook Reels is 9:16 (vertical), which fills the screen on most mobile devices.

Does Vidulk add captions to Reels clips?

Yes, Vidulk’s AI Clipper automatically adds captions to your vertical clips, formatted for Facebook Reels.

Can I use landscape or square videos for Facebook Reels?

Yes, since June 2025, Facebook accepts any format for Reels, but vertical (9:16) clips provide the best viewing experience.

Is Vidulk available for both iOS and Android?

Yes, Vidulk’s AI Clipper app is available on both iOS and Android devices.