ClickyApps

Aspect Ratio Converter

Render vertical, square, or widescreen exports with smart pad & crop in-browser.

Tip: Your data stays in your browser.
Drop a video or browse

MP4, MOV, WebM up to 5 GB / 5 hours. We process everything locally.

Want to try it first? Load the demo clip from the Examples list below.

Examples

Preview
1080×1920 • 9:16 • Smart → pad
MP4 (H.264 + AAC)
Upload a clip to preview
Target
1080×1920
Ratio 9:16
Handling
Smart → pad
Adds bars to keep the full frame.
Format
mp4
Match source fps • CRF 18

FAQs

  • Does my video leave the browser?
    No. Uploads, rendering, and downloads happen locally in your browser — nothing is sent to our servers.
  • What file sizes and lengths are supported?
    Clips up to roughly 5 GB or 5 hours work smoothly in-browser. Larger files are better handled in a desktop editor.
  • What export formats can I choose?
    Choose MP4 (H.264 + AAC) for universal uploads or WebM (VP9 + Opus) for smaller files and embeds. You can also set target FPS and bitrate.
  • How does Smart Fit decide between padding and cropping?
    Smart Fit compares the source and target aspect ratios: wider footage crops to fill vertical frames, taller footage gets padded. You can always override this behaviour.
  • Can I customise the padding style?
    Yes — pick any hex colour for letterboxing, toggle the safe-area overlay, and share those settings with teammates via the share link.
  • Will my audio be changed?
    Audio is re-encoded to AAC (MP4) or Opus (WebM) at upload-friendly bitrates so your export is ready to post immediately.

Guides

YouTube Thumbnail Size and Ratio (2025)
Exact dimensions, aspect ratios, and export settings for YouTube, Shorts, and Instagram thumbnails—with quick presets and quality checks.
Read →
Safe Text Areas for Thumbnails (YouTube/Shorts/Instagram)
Keep your thumbnail text readable across all devices by positioning it inside safe zones—with practical margin guides, platform-specific overlays, and real-device validation using Thumbnail Resizer.
Read →
SRT Format Rules with Examples (2025)
Master SRT cue structure—timecodes, text, spacing, and formatting—with valid/invalid examples, real-time validation using SRT Editor, and quick fixes for upload errors.
Read →
Fix Overlapping SRT Cues (Step-by-Step)
Diagnose and fix overlapping SRT cues with precision nudge controls, merge strategies, and keyboard shortcuts—using real-time waveform validation in SRT Editor to export clean, player-ready caption files.
Read →
Convert 16:9 to 9:16 Without Cropping (ffmpeg) (2025)
Transform horizontal video into vertical format using ffmpeg—with pad-vs-crop strategies, copy-ready commands, quality presets, and workflows that preserve subject framing for Shorts, TikTok, and Reels.
Read →
Target LUFS for YouTube, TikTok, and Spotify (2025)
Hit platform loudness targets without clipping—with integrated LUFS benchmarks, true peak guards, and fast normalization workflows using the LUFS Analyzer for YouTube, TikTok, Spotify, and podcasts.
Read →