How to Resize & Crop Video for Instagram, TikTok and Shorts
If you've ever recorded a video on your phone in landscape mode and then tried to post it to Instagram Stories or TikTok, you've probably seen it squeezed into a tiny strip with black bars on either side. Every major short-form video platform now expects vertical (9:16) video, while a lot of footage — especially from cameras, screen recordings, or older content — is shot in widescreen (16:9). Here's how to fix that, for free, in your browser.
The Core Problem: Aspect Ratio Mismatch
Aspect ratio is the relationship between a video's width and height. A typical landscape video (filmed by a camera held horizontally, or most desktop screen recordings) is 16:9 — wider than it is tall. Instagram Stories, Reels, TikTok and YouTube Shorts are all designed for 9:16 — taller than it is wide, matching how people naturally hold their phones.
When you upload a 16:9 video to a 9:16 platform, one of two things usually happens automatically: the platform either crops the sides off, or it adds black bars (letterboxing) above and below to fit the frame without cropping. Neither is ideal — automatic cropping can cut off important content, and letterboxing leaves large black areas that waste screen space and look unpolished.
Cropping vs Resizing — Which Should You Use?
These solve the aspect ratio problem in different ways, and the right choice depends on your footage:
- Cropping cuts away parts of the frame — for example, the left and right edges of a 16:9 video — to reach a new aspect ratio without stretching anything. The remaining content keeps its original proportions and looks natural. The trade-off is that whatever was in the cropped-out areas is gone.
- Resizing scales the entire frame to new dimensions. If the new dimensions have a different aspect ratio than the original, the image will look stretched or squashed unless you accept some letterboxing.
For most social media use cases — especially talking-head videos, vlogs, or content where the subject is centred — cropping to 9:16 is usually the better choice. It keeps the subject sharp and unstretched, at the cost of losing some background on the sides.
How to Resize or Crop Video — Step by Step
- Open the FlipFiles Video Resizer & Cropper and upload your video
- Choose Crop mode for a social-media aspect ratio change, or Resize mode if you need exact pixel dimensions
- For cropping, select your target ratio — 9:16 for Stories/Reels/TikTok/Shorts, 1:1 for square Instagram posts, or 4:5 for portrait feed posts
- Click Process and preview the result
- Download your resized video, ready to upload
Cropping is centred on the frame by default — equal amounts are removed from each side to reach the target ratio, which works well when your subject is roughly centred in the original shot.
Platform Aspect Ratio Cheat Sheet
- 9:16 — Instagram Stories & Reels, TikTok, YouTube Shorts, Snapchat
- 1:1 — Instagram feed posts (square), some Facebook posts
- 4:5 — Instagram feed posts (portrait), often shows more content than 1:1 in-feed
- 16:9 — YouTube standard videos, most desktop/TV viewing
What If My Subject Isn't Centred?
Centre-cropping works well when your subject is already roughly in the middle of the frame — common for vlogs, interviews, and most phone footage. If your subject is off to one side and centre-cropping would cut them out, you have two options: re-record with the subject centred if possible, or accept some letterboxing by using Resize mode instead, which keeps the entire frame visible at the cost of black bars on the sides.
Speeding Up or Trimming Before You Resize
If your clip is longer than needed, trimming it down first with our Video Trimmer means less footage to process when resizing. And if you want to speed up a longer recording into a punchy short clip — for example, turning a 2-minute process into a 20-second time-lapse — our Video Speed Changer adjusts playback speed while keeping audio pitch natural, so voiceovers don't sound sped-up and chipmunk-like.