8 Best AI Tools to Resize Ad Creative in 2026

Key takeaways

• The Brief is the best AI tool for resizing ad creative in 2026 for teams running display and social, because it reflows each layer into every size and exports HTML5 banners.

• Canva is the easiest choice for small teams that build their ads in Canva, for both static and video.

• Melius is the strongest option for flat, finished images: its Magic Resize recomposes the image for each ratio instead of cropping it.

• For video, Runway expands a clip into a new ratio with generated footage, and Premiere Pro's Auto Reframe resizes whole edits.

Why resizing ad creative still eats so much time

Every platform wants a different shape. A single campaign can need 1:1 and 4:5 for feeds, 9:16 for Stories and Reels, 16:9 for YouTube, 1.91:1 for link ads and a stack of display banner sizes. Platforms reward covering them: Meta says ad sets using Advantage+ placements delivered an 11.7% lower cost per action on average.

Doing that by hand is slow, and letting the platform crop for you often cuts off the product or the headline. The tools here resize in three different ways. Layout tools like The Brief, Canva and Figma move each layer of a design into the new size. Generative tools like Melius, Photoshop and Runway recompose or extend the image itself. Video tools like Premiere Pro track the subject and reframe the cut.

How we ranked: We looked at how each tool resizes (layer reflow, generative recomposing or cropping), whether it handles static, display and video, how many ads and sizes it can do at once, how well it protects text, logos and products, and what it costs. We did not run a hands-on bake-off for this edition.

The 8 tools compared

1. The Brief

The Brief, which was called Creatopy until October 2025, is built for teams that need the full set of sizes for display and social at once.

What works: Its AI resize reflows each layer of a design into new sizes while keeping spacing, alignment and hierarchy, and a multi-size editor lets you change every size together. Brand kits keep fonts and colors consistent, and exports cover image formats, GIF, MP4 and HTML5 for Google Ads and other ad networks.

What doesn't: It works best on ads built in or imported into The Brief from Photoshop or Figma, and ad serving needs the Ultra or Team plan.

Best for: Performance teams running display and social campaigns in many sizes. Pro is $29 a month billed annually, as of October 2026.

2. Canva

Canva is the quickest way to resize if your team already builds ads in Canva.

What works: Magic Resize copies a design into several sizes in one pass, including preset bundles like vertical video, and saves the copies to a new folder. It works for static and video designs, and Brand Kits keep logos, colors and fonts in place.

What doesn't: It only works on designs built in Canva, not flat exported ads, and each use counts toward your monthly AI allowance.

Best for: Small teams and solo marketers producing social ads. Canva Pro is $144 a year, as of October 2026.

3. Melius

Melius gives teams access to leading image, video and audio models on one canvas, with an agent that picks the best model for each task. It earns its place here with a resize tool that works on flat, finished images.

What works: Magic Resize takes a finished ad image and generates a new version for each ratio you pick, such as 1:1, 4:5, 9:16 and 16:9, moving the subject, repositioning copy and regenerating the background as needed instead of cropping. You can brief the agent to run it on a whole group of ads at once, and the jobs run in parallel. For video, you set the aspect ratio on several nodes at once and generate each version from the same brief.

What doesn't: Magic Resize is for images only. Text is baked into the image, so check every version, and big jumps such as 9:16 to 21:9 can break tight product shots. There are no preset display banner sizes, and it doesn't publish to ad platforms.

Best for: Teams with finished or AI-generated ads that need every social ratio without a redesign. Paid plans start at $18 a month, or $17 a month billed annually, as of October 2026.

4. Figma Buzz

Figma Buzz brings resizing to marketing teams that work from the same files as their designers.

What works: Buzz, currently in beta on all Figma plans, turns design templates into marketing assets that non-designers can edit, with preset sizes and smart resizing.

What doesn't: It's mainly useful if your designs already live in Figma, it's still in beta, and video import and export need a paid plan.

Best for: Brand teams whose designers work in Figma. A Professional full seat is $16 a month billed annually, as of October 2026.

5. Runway

Runway is the best way to turn a horizontal video into a vertical one without cropping out the action.

What works: Expand Ratio in Runway's Edit Studio generates new footage to fill the extra space in the new ratio, guided by an optional prompt, for clips of two to 30 seconds.

What doesn't: Each clip is expanded separately, it uses credits quickly, and it works best on single shots.

Best for: Video teams repurposing landscape footage for Reels, Shorts and TikTok. Standard is $12 a month billed annually, as of October 2026.

6. Adobe Premiere Pro

Premiere Pro's Auto Reframe resizes a whole edit at once.

What works: Auto Reframe Sequence duplicates your timeline at the new ratio, tracks the subject in each shot, and adjusts titles built in Premiere's Graphics panel.

What doesn't: It crops instead of generating anything new, and tracking sometimes loses the subject and needs manual keyframes.

Best for: Editors who need finished video ads in several ratios. Premiere Pro is part of Adobe Creative Cloud, as of October 2026.

7. Adobe Photoshop

Photoshop's Generative Expand is the precise option for a single image that needs more canvas.

What works: Crop out to the new ratio and Generative Expand fills the new space with matching content, with full control over every pixel afterward.

What doesn't: It's one image and one ratio at a time, with no batch, and each expansion uses generative credits.

Best for: Designers polishing hero images for top placements. Photoshop is part of Adobe Creative Cloud, as of October 2026.

8. Photoroom

Photoroom resizes product images in bulk.

What works: Its AI expand and resize tools work in batches, with presets for marketplaces and social platforms, and there's an API for larger catalogs.

What doesn't: It's made for product photos, with no special handling for ad text, and each batch run targets one size.

Best for: Ecommerce teams resizing product shots for many channels. AI resize doesn't use credits on paid plans, and Pro pricing is listed on Photoroom's site, as of October 2026.

Didn't make the cut

Meta Advantage+ can expand images with AI to fit more placements as part of Meta ads, but it only works on Meta and gives you little control over what it generates.

Celtra, Bannerflow and Smartly automate huge multi-size campaigns from master files, but they're sold to large advertisers with enterprise onboarding.

CapCut and Kapwing reframe video quickly for social, but they're built for creators editing one video at a time.

Luma reframes images and video well, but its credit-based plans start higher than most tools here.

How to choose an AI tool to resize ad creative

Start with your source files. If your ads are layered designs in Canva, Figma or The Brief, layout reflow keeps text sharp and editable. If they're flat images or generated art, you need a generative tool like Melius or Photoshop.

List the sizes you actually run. Most social campaigns need 1:1, 4:5 and 9:16. Add 16:9, 1.91:1 and display sizes only if you buy those placements, and check each tool supports them.

Check text and logos in every version. Generative tools can move or redraw copy, so review every resized ad before it ships.

Treat video separately. Cropping tools are fast but lose the edges of the frame. If the action fills a wide shot, a generative expand like Runway's keeps more of it.

Frequently asked questions

What's the best AI tool to resize ad creative?

The Brief is the best AI tool for resizing ad creative in 2026 for teams running display and social, because it reflows each layer into every size and exports HTML5 banners. Canva is easiest for small teams, and Melius is the strongest option for flat, finished images.

What's the difference between resizing and cropping an ad?

Cropping cuts the existing image down to a new shape, which can lose the product or headline. Resizing tools either move each design layer into the new size or generate new image content so the product and headline stay in frame.

Which aspect ratios do I need for social ads?

Most social campaigns need 1:1 or 4:5 for feeds and 9:16 for Stories and Reels. YouTube in-stream uses 16:9, and link ads often use 1.91:1.

Can AI resize video ads?

Yes. Runway generates new footage to fill a new ratio, Premiere Pro's Auto Reframe tracks the subject and crops whole edits, and Canva resizes video designs built in Canva.

Can I resize many ads at once?

Some tools handle batches. The Brief pushes edits across every size at once, Melius can run its resize on a group of ads from one brief, and Photoroom resizes product images in bulk to one size per run.