Ad Builder turns one piece of source content into a whole set of on-brand ads. It walks you through Setup → Formats → End card → Audio → Finalize, and most sets take under five minutes to build. The End card and Audio steps only appear when you pick a CTV or online video format — display-only sets go straight from Formats to Finalize.
Step 1 — Setup: pick a brand and a hero
Open Ad Builder from the sidebar and pick a brand. Every ad inherits the brand's logos, palette, fonts, and copy defaults automatically.
Next choose your hero — the content your ads are built around:
Videos — brand videos already in your library
Import — social posts you've imported (organic or dark posts both work)
Motion — AI-animated versions of still images
Clip — clipped segments; Smart clip pulls the strongest segment from a longer video automatically
Your chosen hero shows as a small thumbnail at the top of the list. Started from a post on the Import page? Once you pick a brand, Ad Builder jumps straight to Formats.
Step 2 — Formats: choose the ads you want
Click Continue and your hero appears across every format family. If your team has saved templates, they show in a My Templates row at the top — click one to start that ad from your team's layout (Saved Templates).
CTV — 1920×1080 connected-TV spots with social framing and a QR code
OLV — online video for pre-roll and mid-roll (VAST)
L-Bar — video with an L-shaped branded frame (also called a squeezeback)
Overlay — a branded layer over the video
Pause — pause-ad layouts for streaming
Display — HTML5 banners in every IAB size. The most-used sizes (300×250, 300×600, 320×480 and more) show first; click More for the rest, or add a custom size. Add all selects every size at once and Clear starts over.
Each format shows a live preview. Click Select under the preview to add that ad to your set; click it again to remove it. Mix formats freely — one set can hold CTV, pause, and display together, all sharing the same brand, hero, and copy.
Customize
Click Customize to adjust copy, CTA, tagline, caption, and layout. Display layouts are shown as picture tiles — Framed, Edge to edge, Story, Banner only, and body layouts Side-by-side or Stacked. Basic mode edits every size at once; Pro gives you per-size control over copy, logo, background, crop & layout, social skin (platform look), and display extras. Under Background → AI, a For this post tile keeps the AI background made for your post — even if you dismissed the "Custom background ready" offer — so you can apply it any time. More: How to Adjust Creative Cropping & Layout.
Step 3 — End card (video formats only)
CTV ads get an end card automatically when your video is shorter than a standard spot length (6, 15, 30, or 60 seconds) — it fills the gap. Online video ads run the exact length of your video and start with no end card. See Is there a maximum video length?
To change it, choose how your video ends: No end card, or a Centered, Split, or Typographic end card with your logo, CTA, and QR code. Two previews side by side show the Full ad and the End card alone. Your team's saved end-card templates appear in a My Templates row underneath. To fine-tune how long the end card stays on screen, click Customize on this step and use Duration.
Step 4 — Audio (video formats only)
Spaceback checks whether your video's sound covers the end card. If it does, there's nothing to do. If the end card would play silent, you'll see Fix with AI; otherwise Generate with AI adds music on request. Pick Fill the silent end card (keep your audio, extend it over the end card) or Match and replace (new music for the whole ad). Prefer your own track? Use Manual upload → Upload custom audio, then balance it against the original sound. Audio settings apply to that one ad only.
Step 5 — Finalize: review and render
Finalize shows every ad in your set. Rename creatives, click Edit variant for last-mile tweaks, Remove anything you don't need, or Add more to go back for extra formats — then click Render my ads.
Rendering runs in the background; watch progress in Creatives → Render Queue. Finished ads land in your Creatives library, ready to preview, share, and tag.
Bonus: Motion Boost. Image display ads in the most-used sizes also get two automatic motion video copies — same design, now moving. Look for the Motion Boost badge in Creatives.
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