What you'll learn
- Every platform has a different required aspect ratio — one video rarely works everywhere without resizing
- 9:16 for TikTok and Reels, 16:9 for YouTube, 1:1 for feed posts — know these before filming
- Crop to fill the new ratio or add padding to preserve the full frame — both are valid depending on content
Every major platform has its own preferred video dimensions. A horizontal YouTube video uploaded to TikTok gets pillarboxed with black bars on both sides. A vertical Reel uploaded to LinkedIn may be cropped or displayed at the wrong ratio. A 1:1 Instagram feed video on Twitter shows letterboxed.
Resizing video before upload is not optional if you want your content to look right. This guide covers every platform's current size requirements, when to crop versus add padding, and how to resize any video in your browser in under 2 minutes.
Video Resizer — Free
Resize video to any aspect ratio or platform spec in seconds.
The Platform Video Size Reference
Before resizing, know your target. Here are the current video specifications for every major platform:
| Platform | Format | Aspect ratio | Recommended resolution | Notes |
|---|---|---|---|---|
| Instagram Reels | Vertical | 9:16 | 1080 x 1920 | Standard for Reels — full screen |
| Instagram Feed | Square / Portrait | 1:1 or 4:5 | 1080 x 1080 or 1080 x 1350 | 4:5 shows larger in feed |
| TikTok | Vertical | 9:16 | 1080 x 1920 | Standard for all TikTok video |
| YouTube (standard) | Landscape | 16:9 | 1920 x 1080 | Standard YouTube video |
| YouTube Shorts | Vertical | 9:16 | 1080 x 1920 | Same as TikTok format |
| Twitter / X | Flexible | 16:9 or 1:1 | 1280 x 720 minimum | 16:9 displays best in timeline |
| Flexible | 1:1 or 16:9 | 1920 x 1080 recommended | Landscape or square both work | |
| Flexible | 1:1, 4:5, 16:9 | 1080p | 4:5 shows larger in feed | |
| Vertical | 9:16 or 2:3 | 1000 x 1500 | Vertical performs better |
9:16
is now the dominant format for short-form video across TikTok, Instagram Reels, and YouTube Shorts — filmed vertically on a phone
Crop vs Padding: Which Approach Is Right?
When you resize a video to a different aspect ratio, you have two options:
Crop — remove the content outside the target frame. A 16:9 landscape video resized to 9:16 would keep only the center portion of the horizontal frame, cropping the left and right edges.
Padding (letterbox/pillarbox) — add black bars (or a color fill) to fill the areas the original frame does not cover. No content is lost, but the original video is smaller within the frame.
Which to choose depends on the content:
Crop is better when: The subject is centered and the edges of the original frame contain background or negative space. Talking-head videos, product demos, interview setups.
Padding is better when: Important content runs to the edges of the frame — action sequences, landscapes, group shots, or any composition where the edges matter.
How to Resize a Video with Framebit
Step 1: Upload your video
Open Framebit's video resizer and drag your video file into the upload area. MP4, MOV, and WebM are supported. The tool displays your current video dimensions and aspect ratio.
Step 2: Choose your target format
Platform presets — select the platform you are targeting. The preset sets the correct aspect ratio and recommended output resolution automatically.
Custom dimensions — enter specific pixel dimensions if you have precise requirements. Useful for platforms with unusual specs or specific thumbnail-video size coordination.
Step 3: Choose crop or padding
After selecting the target ratio, choose how the tool handles the mismatch:
Fill (crop) — the video fills the entire target frame. Content that falls outside the new ratio is cropped. You can drag the crop area to choose which portion of the original is preserved.
Fit (padding) — the entire original video is contained within the new frame. Black bars fill the remaining space. No content is cropped.
Step 4: Adjust the crop position
If you chose cropping, drag the frame to position it over the part of the original video that matters most. For a landscape-to-vertical crop, center the subject in the vertical frame — the tool shows a preview of what will be kept.
Step 5: Export
Click Resize and download your resized MP4. The output is at the target resolution using H.264 encoding — compatible with all platforms.
Common Resizing Scenarios
Repurposing a YouTube video for TikTok
YouTube is 16:9 (landscape). TikTok is 9:16 (vertical). These are the inverse of each other — you are fitting a wide frame into a tall one.
Your options:
- Crop to vertical — keep the center of the horizontal frame. Works well for interview and talking-head content where the subject is centered.
- Pillarbox — the full 16:9 frame shows at the top of the vertical space with black bars below. Common for informational videos where the full frame is needed.
- Reframe — for important content, the right approach is to crop to the best subject position, accepting that some original frame is lost.
Repurposing a TikTok video for YouTube
The reverse: you are fitting a tall frame into a wide one. Options are to letterbox (add bars on both sides) or crop to 16:9 (losing top and bottom).
For most vertical content being republished on YouTube, letterboxing is the more honest format — it shows the content as filmed without deceptive cropping.
Making a square version for Instagram feed
Both 16:9 landscape and 9:16 vertical need to be cropped or padded to fit 1:1. A square crop of either usually works well for the center of the frame.
Pre-Production: Shoot for Multiple Ratios at Once
The most efficient approach is to plan ahead. If you know you will be publishing on both YouTube (16:9) and TikTok (9:16), consider two strategies:
Shoot wider and crop for each platform — if your camera supports 4K, shoot wide. In post-production, crop each exported version for its target platform. This preserves quality and gives you composition control for each format.
Center-frame your subject — for creators who want one recording to work across formats, keeping the main subject centered in the frame means a crop in any direction preserves the subject. This constrains your composition but makes repurposing fast.
Design vertical-first — for short-form content, shoot vertically (9:16) from the start. TikTok, Reels, and Shorts all use 9:16. This is now the dominant format for video under 3 minutes. You can always crop a wide video out of a vertical frame for other uses, but not the reverse without letterboxing.
Video Resizer — Free
Resize video to any aspect ratio or platform spec in seconds.