← Back to Tools
Video Aspect Ratio Converter
Reformat your video for any platform. Get exact crop or letterbox dimensions for YouTube, TikTok, Reels, and more.
100% browser-based — your inputs never leave your device. Just a calculator, no upload required.
Source video
Source ratio: 16:9 (1.778 decimal)
Target platform
Visual comparison
Source
16:9→
Target
9:16Option 1: Crop
608 × 1080
Trim 656px from each side (left + right)
Keeps all output pixels at target ratio. Lose some source content but fills the entire output frame.
Option 2: Letterbox
1080 × 608
Add 656px black bars on top and bottom (letterbox)
Keeps every source pixel. Adds black bars to reach the target frame. Best for content with important edges.
Target details
PlatformTikTok
Aspect ratio9:16
Recommended1080×1920
Vertical short-form
How to use
- 1.Enter your source video dimensions
- 2.Pick the target platform
- 3.Choose to crop (lose pixels) or letterbox (add bars)
- 4.Use the dimensions in your editor or ffmpeg
When to use what
- Crop — vertical clips for TikTok/Reels where subject is centered
- Letterbox — when text or edges matter (landscape shots, infographics)
- Resize only — when source and target ratios already match
Frequently Asked Questions
How do I convert a 16:9 video to 9:16 for TikTok?+
You have two choices: crop the sides of the horizontal video to fit vertical (loses content on left and right) or letterbox it (keeps everything but adds black bars top and bottom). For TikTok, cropping the focal subject usually looks more native.
What's the difference between letterboxing and pillarboxing?+
Letterboxing adds black bars to the top and bottom (wide content in a narrower frame). Pillarboxing adds black bars to the left and right (narrow content in a wider frame). The names come from old TV broadcasting.
What aspect ratio should I use for YouTube?+
YouTube's primary player is 16:9. Upload at 1920×1080 (1080p), 2560×1440 (1440p), or 3840×2160 (4K) for best results. YouTube Shorts use 9:16 vertical at 1080×1920.
Does this tool actually crop my video?+
No — it's a calculator that tells you what dimensions to use. To actually crop or letterbox, use a video editor like DaVinci Resolve, Premiere, Final Cut, CapCut, or ffmpeg with the calculated values.
What's the best ratio for Instagram Reels?+
Instagram Reels use 9:16 vertical at 1080×1920. The same dimensions work for TikTok and YouTube Shorts, so you can post the same export across all three platforms.
When should I crop instead of letterbox?+
Crop when keeping your subject centered in the new frame matters more than preserving every pixel — typical for short-form vertical content. Letterbox when content at the edges is important, such as text, motion graphics, or wide landscape shots.
Learn more
Available formacOS&Windows
Make every screenshot look pro.
ScreenSnap Pro turns plain screenshots into polished visuals — backgrounds, annotations, GIF recording, and instant cloud links.
See ScreenSnap Pro