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The Video Editor lets you refine any video in your workspace without leaving AdStellar. Open a generated video ad, an uploaded clip, or start from a blank canvas — then trim, layer media, add captions and overlays, generate AI voiceovers, and export the finished cut back to your project and Media Library.

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Opening the Editor

You can launch the Video Editor in a few ways:
  • Canvas → Video Editor to start from scratch or pick from your existing videos
  • From any video generation result — open the video and click Edit
  • From a project — open a video asset and click Edit Video
If you start fresh, you’ll pick an aspect ratio (Reels 9:16, Square 1:1, Feed 4:5, or In-Stream 16:9) and a name for the new editor project before the canvas opens.

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What You Can Do

Trim & arrange clips

Cut, split, and reorder clips on a multi-layer timeline. Build a sequence from multiple videos or images.

Add text & overlays

Drop in titles, captions, shapes, stickers, and animated text with full control over fonts, colors, and timing.

Stock media library

Search a built-in library of stock videos, images, and animated stickers to layer into your edit.

Filters & color

Apply cinematic filters, adjust brightness/contrast/saturation, and color-grade individual clips.

Transitions & effects

Add transitions between clips and apply effects like blur, zoom, and motion to keep viewers engaged.

Audio tracks

Upload your own music, layer multiple audio tracks, adjust volume per clip, and fade in/out.

AI voiceovers

Open AI Audio in the left sidebar, type a script, pick a voice, and generate a natural-sounding voiceover from a library of professional AI voices.

AI sound effects

In the same AI Audio panel, switch to Sound Effects and describe the sound you want in plain English (e.g. “upbeat whoosh transition”) and the editor generates it.

Auto captions

Automatically transcribe your video and add styled captions to the timeline in one click.

Resize aspect ratio

Switch between Reels, Feed, Square, and In-Stream formats without re-creating your edit.

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How to Edit a Video

1

Open the editor

Go to Canvas → Video Editor, or click Edit on any video in a project or generation result.
2

Choose an aspect ratio

For new editor projects, pick the aspect ratio that matches where you’ll run the ad. You can change it later from the toolbar.
3

Build your timeline

Drag clips, images, and audio onto the timeline. Use the playhead to preview as you go. Trim by dragging clip edges; split clips at the playhead to cut.
4

Layer overlays & captions

Add text, stickers, or shapes from the sidebar. Use Auto Captions to transcribe spoken audio and drop styled captions onto the timeline.
5

Generate voiceover or sound effects (optional)

Click the AI Audio icon in the left sidebar (under Media, My Assets, Text, Stock, Transitions, Captions). The panel slides out with two tabs:
  • Text to Speech — pick a voice, paste your script (up to 5,000 characters), and click Generate Speech. When the clip is ready, click Add to Timeline to drop it onto the timeline at the playhead.
  • Sound Effects — describe the sound you want in plain English and click generate. Add the result to the timeline the same way.
Once the clip is on the timeline you can trim, move, or layer it like any other audio track. AdStellar’s video editor does not include a “Lip Sync” step — if you need a talking-head video where an avatar’s mouth matches new audio, generate it from Canvas → AI Actor / Premium Video instead, then open the resulting video here for trimming and overlays.
6

Save your edit

Click Save in the top-right. You’ll be asked whether you want to save as a new version or overwrite the current video. The exported MP4 is saved back to your project and added to your Media Library so you can launch it as an ad.

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AI Audio: Voiceovers & Sound Effects

The AI Audio panel is where you generate AI voiceovers (text-to-speech) and AI-generated sound effects directly inside the editor. It lives in the left sidebar of the editor — look for the music-note icon labeled AI Audio, at the bottom of the stack underneath Media, My Assets, Text, Stock, Transitions, and Captions. Clicking it opens the panel; clicking it again (or anywhere else) closes it. The panel has two tabs:

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Text to Speech

  1. Open AI Audio in the left sidebar.
  2. Make sure the Text to Speech tab is selected.
  3. Pick a Voice from the dropdown — the list includes our curated professional voices.
  4. Paste or type your script into the Text field (5,000-character limit per generation).
  5. Click Generate Speech. A short progress indicator appears while the audio is rendered.
  6. When the clip is ready, click Add to Timeline to place it onto the timeline at the current playhead position.
Once it’s on the timeline you can drag it, trim it, layer it under other audio, or fade it in/out like any other track.

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Sound Effects

  1. Open AI Audio in the left sidebar.
  2. Switch to the Sound Effects tab.
  3. Describe the sound you want in plain English (e.g. “short upbeat whoosh transition, no music”).
  4. Click Generate, then Add to Timeline when the preview sounds right.

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What AI Audio is not

The video editor’s AI Audio panel is for adding audio to a timeline. It does not include a “Lip Sync Render” or any step that re-syncs an existing avatar’s lip movements to new audio. If you’ve generated an AI-actor / talking-head video and want to swap the spoken audio with the lips re-synced to the new track, that’s the Premium Video / AI Actor flow — generate it from Canvas → AI Actor, render the final lip-synced output from the project page (the Render Final Video button), and then bring the finished MP4 into the Video Editor here for any additional trimming, captions, or overlays.

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Saving: New Version vs. Overwrite

When you save an edit, AdStellar gives you two choices:
  • Save as new version — keeps the original video untouched and creates a separate edited copy. Use this when you want to A/B test different cuts, or keep a fallback.
  • Overwrite current video — replaces the displayed video on the generation with your edited cut. The original source file is preserved internally so you can always come back and re-edit.
Both options save the editor project state too, so reopening the video drops you back into the timeline exactly where you left off.

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Aspect Ratios

The editor supports the four aspect ratios you’ll use for Meta ads: You can switch aspect ratios mid-edit — the canvas resizes and your clips stay in place so you can reposition them.

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Browser Requirements

The Video Editor runs in your browser using hardware-accelerated rendering, so it needs a modern browser with WebGL2 support. We recommend the latest version of Chrome, Edge, Brave, or any other Chromium-based browser. Safari and Firefox are not currently supported.

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Plan Availability & Limits

The Video Editor is included on every plan so you can explore and try edits. However, exporting and saving a finished edit — along with some AI features — has limits depending on your plan.

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Saving & Exporting

The Video Editor — including unlimited saves and exports — is included on every plan (and during your free trial). Editing and exporting consume AI credits like other AI features, and you’ll see the cost before you render.

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Other Limits

  • Voiceover script length — up to 5,000 characters per text-to-speech generation. For longer scripts, split them across multiple generations and stitch the audio clips together on the timeline.
  • Aspect ratios — 9:16, 4:5, 1:1, and 16:9 are supported. New blank editor projects default to 9:16 (Reels & Stories).
  • Project state size — very large editor projects (hundreds of clips and overlays) may take longer to save. For typical 15–60 second ads, you won’t hit any practical limit.

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Tips for Great Video Ads

  • Hook in the first 2 seconds — start with motion, a bold caption, or a question to stop the scroll
  • Add captions — most viewers watch with sound off; auto captions take seconds and dramatically lift completion rates
  • Keep it short — 15–30 seconds outperforms longer cuts on Meta in most cases
  • Use vertical (9:16) for Reels & Stories — it’s the highest-performing placement for most ecommerce brands
  • Layer a voiceover over silent b-roll — combine AI text-to-speech with stock clips to produce talking-head-style ads in minutes