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How do I resize a video ad for TikTok, Reels and YouTube in Arcads?

How to resize a video in Arcads for each ad placement, or how to shorten it to 15 seconds.

Written by Romain Torres

Introduction

One ad usually runs in several placements. Resize Media changes the format of any video or image, by cropping it or fitting it on a blurred background, so one generation covers every placement.

Insight: Using Mark? Write "Use a 9:16 aspect ratio by default" in Custom Instructions and every new ad starts vertical.

Which format for which placement?

  • 9:16 for TikTok, Instagram Reels and Stories, and YouTube Shorts

  • 4:5 or 1:1 for Facebook and Instagram feed

  • 16:9 for YouTube and connected TV

How to resize a video

Step 1: Open Resize Media

In Studio, open Resize Media from the tools.

Step 2: Choose your video

Pick a video or image from your workspace.

Step 3: Pick the new format and generate

Select 9:16, 4:5, 1:1 or 16:9, choose crop or fit, and click Generate. Resizing uses 0 credits.

How to fit the length

  • Trim Video cuts to an exact start and end frame (0 credits)

  • Change Speed shortens a clip, for example a 20-second video down to 15 seconds (0 credits)

FAQs & Common Issues

Do I need to regenerate the ad for each format?

No. Generate once and resize.

My captions sit in the wrong place after resizing.

Add captions after resizing, and set the position to Top, Center or Bottom.

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