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.

LinkedIn (Native Feed Video, Including Vertical): Current Video Specs & Export Guide

LinkedIn supports a range of video formats and aspect ratios for native feed videos, including vertical. Here are the latest upload specs and practical steps to export clips that fit.

LinkedIn (native feed video, incl. vertical) video specs (as of 2026-08)
Spec	Value
Max length	15 min (LinkedIn Help 'Video sharing troubleshooting', current article states 15 min with no desktop/mobile split); third-party guides still cite 10 min when uploading via the mobile app; separate LinkedIn Page/Career Page tab videos: 10 min
Aspect ratio	Any ratio from 1:2.4 to 2.4:1 accepted (vertical 9:16 & 4:5, square 1:1, landscape 16:9 all within range); LinkedIn's own video-ad specs list 4:5 (1080x1350), 9:16 (1080x1920), 1:1 (up to 1920x1920), 16:9 (1920x1080) with 5% tolerance; vertical uploads may surface in the mobile full-screen vertical video feed/tab
Resolution	Accepted range 256x144 - 4096x2304; 1080x1920 (9:16) / 1080x1350 (4:5) / 1920x1080 (16:9) max per LinkedIn ad specs
Max file size	5 GB (min 75 KB) for native posts; ads: 500 MB
Frame rate	10-60 fps; bit rate 192 kbps - 30 Mbps
Formats / codecs	MP4, MOV, AVI, WEBM, MKV, WMV, VC1, MPEG/MPEG2/MPEG1VIDEO, DVVIDEO, QTRLE, TSCC2 on desktop/iOS/Android (ProRes may upload but will not process). Note: the older Pages/Career Pages tab-video article says AVI, QuickTime and MOV are NOT supported there and lists AAC/ASF/FLV/MP4/MPEG-1/MPEG-4/MKV/WebM/H264/VP8/VP9/WMV2/WMV3
Captions	Auto captions available to all members and Pages (toggle on during upload; may take time to appear after posting; supported languages: English, Spanish, Portuguese, French, German, Italian, Indonesian, Turkish, Arabic, Dutch); captions editable/removable after posting; SRT closed-caption file can be attached when sharing from desktop; viewers can show/hide CC in the full-screen player
Safe zones	LinkedIn Help: keep the top, bottom and side edges free of key elements, text and logos so they aren't overlapped by the LinkedIn UI - no pixel/percent values published

Sources: https://www.linkedin.com/help/linkedin/answer/a548372 · https://www.linkedin.com/help/linkedin/answer/a1311816 · https://www.linkedin.com/help/linkedin/answer/a1327025 · https://www.linkedin.com/help/linkedin/answer/a552177/add-closed-captions-to-videos-on-linkedin?lang=en · https://www.linkedin.com/help/linkedin/answer/a6290168 · https://business.linkedin.com/advertise/ads/sponsored-content/video-ads/specs · https://www.brandwatch.com/blog/linkedin-video-specs/ · https://blog.sendspark.com/linkedin-video-specs. Specs change - verify in the platform's help center before a big upload.

LinkedIn (native feed video, incl. vertical) Video Specs

LinkedIn Native Feed Video Specs (2026)

LinkedIn allows video uploads directly to the feed, with support for vertical, square, and landscape formats. Refer to the on-page data table for the most up-to-date details. Key points:

Max length: 15 minutes (some mobile uploads may still be limited to 10 minutes)
Aspect ratio: Any from 1:2.4 to 2.4:1 (vertical 9:16, 4:5, square 1:1, landscape 16:9 all accepted)
Resolution: From 256x144 up to 4096x2304 (common: 1080x1920 for vertical, 1920x1080 for landscape)
Max file size: 5 GB
Frame rate: 10 to 60 fps
Formats/codecs: MP4, MOV, AVI, WEBM, MKV, WMV, and others (ProRes uploads won't process)
Captions: Auto-captions can be toggled on; upload SRT files from desktop; captions editable after posting

Safe Zones and UI Overlap

LinkedIn overlays interface elements on video edges, especially in the mobile feed and full-screen vertical playback. To avoid important text or logos being obscured, keep all key content away from the top, bottom, and side edges. LinkedIn does not publish exact safe zone pixel values, so a conservative margin is recommended.

Exporting Clips for LinkedIn (Vertical & Other Formats)

For best results, export your video in one of the supported aspect ratios and resolutions. For vertical videos, 1080x1920 (9:16) is optimal. Always encode in MP4 (H.264/AAC) for maximum compatibility. Limit your video to 15 minutes and 5 GB. Set frame rates between 24 and 30 fps for smooth playback. If adding captions, export an SRT file or use LinkedIn's auto-captioning.

If you need to quickly create short, vertical clips from a long video, the Vidulk app (iOS & Android) uses AI to find the best moments and exports them with captions, sized for LinkedIn and other platforms.

Uploading Tips and Common Issues

On iOS, uploading will stall if the LinkedIn app is backgrounded; keep it open until upload completes.
Videos stored in iCloud cannot be uploaded directly from mobile - move them to local storage first.
If your video is rejected, check file size, length, and codec compliance with the table above.
LinkedIn auto-captions may take time to appear after posting; you can edit or remove them later.

Specs Change: Always Double-Check

LinkedIn updates video specs periodically. Before a major upload, verify requirements in the LinkedIn Help Center to avoid compatibility issues.

Export clips that fit these specs automatically - Vidulk reframes to 9:16, captions and trims to length. Free to start on iOS and Android.

Try Vidulk

FAQ

What is the maximum video length for LinkedIn native feed uploads?

The current maximum length is 15 minutes for native feed uploads, but some mobile uploads may still be limited to 10 minutes.

What aspect ratios are supported for LinkedIn feed videos?

LinkedIn accepts any aspect ratio from 1:2.4 to 2.4:1, including 9:16 vertical, 4:5, 1:1 square, and 16:9 landscape.

How do I add captions to LinkedIn videos?

You can enable auto-captions during upload, or attach an SRT file from desktop. Captions can be edited or removed after posting.

What is the recommended export format for LinkedIn videos?

Export in MP4 (H.264/AAC) for maximum compatibility. Keep within the published limits for file size, length, and resolution.

How can I create vertical clips for LinkedIn?

Use a video editor to export at 1080x1920 (9:16), or try the Vidulk app's AI clipper (iOS & Android) to generate vertical, captioned clips from longer videos.