Free Tool
Add letterbox or pillarbox to your video — free, in-browser
Change video aspect ratio by adding padding for Instagram, YouTube, TikTok, and more.
The problem
Horizontal footage doesn't work for TikTok (9:16) and vertical footage looks wrong on YouTube (16:9). Black bars added by posting platforms look unprofessional and are sometimes cropped. You need to control the framing yourself.
The NSS solution
NSS Video Canvas Extender adds a configurable padding color around your video to reach the target aspect ratio — 1:1, 9:16, 16:9, 4:3, 21:9, or custom. Your subject stays centered and full size.
How to use it
- 1
Make horizontal videos into Instagram squares
Add top and bottom padding to convert 16:9 horizontal footage to 1:1 square for Instagram feed posts without cropping your subject.
- 2
Convert landscape to portrait for Reels and TikTok
Add side bars to make a 16:9 clip into 9:16 for Stories, Reels, and TikTok — keeping the original framing while meeting format requirements.
- 3
Add cinematic black bars
Add top and bottom black bars to convert 16:9 to 21:9 for a cinematic film look in video essays, travel vlogs, and narrative projects.
Step-by-step guide
- 1
Choose the target aspect ratio
Pick from 1:1, 4:3, 16:9, 9:16, 4:5, 21:9, or enter a custom ratio.
- 2
Choose a padding color
Black for cinematic look, white for a clean studio feel, or any custom hex color to match your brand.
- 3
Upload and download
Processing plays through at real time. Download the padded video when complete.
Common questions
Does this crop my video?
No — the canvas extender only adds padding. Your subject is never cropped. The tool scales the canvas out around your video.
What aspect ratios are supported?
1:1, 4:3, 16:9, 9:16, 4:5, 21:9, and custom. Enter any W:H ratio for a custom canvas.
Ready to try it?
No account. No subscription. No images uploaded to any server.
Extend video canvas free→