How to Edit Video With AI Text Prompts (2026)

Quick answer

To edit a video with an AI text prompt, upload a short clip, ask for one specific visual change, state what must remain unchanged, and review the result across the whole shot. Prompt editing is best for changing what appears inside existing footage. Use a timeline editor when you need exact cuts, sequencing, captions or audio timing.

Watch: editing existing footage with text prompts

This official walkthrough demonstrates object removal, car replacement, reference-image additions, environment changes and restyling. It illustrates prompt-based visual edits inside existing footage; it does not replace a timeline editor for exact cuts, captions or audio timing.

Official Magic Hour tutorial · 11:07 · Published 2026-09-20. The recording reflects the interface and model choices at that date; current controls can differ. References and prompts help continuity but do not guarantee it.

Tutorial chapters

YouTube’s auto-generated chapter labels and start times are listed below. Each timestamp opens the official video at that point.

0:00 — Introduction to AI editing

0:52 — Object removal test

1:31 — Object replacement test

2:31 — Adding objects to scenes

4:24 — Changing environments

5:22 — Restyling video footage

7:53 — How to use AI editors

9:33 — Best practices and conclusion

Try the corresponding workflow in Magic Hour AI Video Editor. Start with a short representative shot, keep the source assets and prompt, and review the complete output before producing more.

Test one prompt-based edit

Upload a short rights-cleared clip and ask for one specific visual change. Review the beginning, middle and end before trying a second prompt.

Edit a video free

Magic Hour publishes this guide and includes its own product in the comparison. Treat the recommendations as editorial guidance from a vendor, and verify the linked first-party product details and your own output requirements before choosing a tool.

Prompt editing or timeline editing?

Approach	How It Works	Best For
Timeline editing (CapCut, VEED)	You manually arrange clips, trim footage, add effects, adjust audio, and work with layers on a timeline.	Full video production, multi-clip edits, precise timing, captions, transitions, and audio work.
Prompt-based editing (Magic Hour)	Upload an existing clip, describe the visual change in natural language, and let AI generate an edited version.	Quick object removal, background changes, visual restyles, color changes, added elements, and creative variations.

Choose by task. Prompt editing can remove, replace, add, recolor or restyle visual elements. Timeline editing assembles clips and controls timing. Many production workflows use both.

A reliable prompt formula

Write four parts in this order: target, change, preservation rules, finish. Name the exact subject or region, describe one change, list the elements that must remain stable, then specify the intended lighting, texture or realism.

Template: [Change] the [target] in [location] to [result]. Keep [subject identity, action, framing, camera movement and unaffected objects] unchanged. Match the original [lighting, perspective, shadows and texture].

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Six prompt recipes

Remove: Remove the person walking in the background on the right. Keep the main subject, camera movement, lighting and scenery unchanged. Reconstruct the occluded area naturally.
Replace: Replace the illuminated sign text with ‘Magic Hour.’ Preserve its shape, position, perspective, glow and reflections. Do not change the foreground subject.
Restyle: Restyle the clip as handmade clay animation. Preserve the subject's identity, action, framing and camera movement. Use soft studio lighting and visible clay texture.
Recolor: Change only the jacket from red to deep blue. Preserve material texture, folds, shadows, skin tones and every other color.
Atmosphere: Add light morning fog behind the subject. Keep the foreground sharp and preserve the original action, framing and exposure.
Lighting: Brighten the subject's face with soft window light. Preserve identity, background, camera movement and the scene's original color palette.

Remove the person walking in the background on the right. Keep the main subject, camera movement, lighting and scenery unchanged. Reconstruct the occluded area naturally.

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Replace the illuminated sign text with ‘Magic Hour.’ Preserve its shape, position, perspective, glow and reflections. Do not change the foreground subject.

Try in AI Video Editor

Restyle the clip as handmade clay animation. Preserve the subject's identity, action, framing and camera movement. Use soft studio lighting and visible clay texture.

Try in AI Video Editor

Change only the jacket from red to deep blue. Preserve material texture, folds, shadows, skin tones and every other color.

Try in AI Video Editor

Add light morning fog behind the subject. Keep the foreground sharp and preserve the original action, framing and exposure.

Try in AI Video Editor

Brighten the subject's face with soft window light. Preserve identity, background, camera movement and the scene's original color palette.

Try in AI Video Editor

How to edit a video with AI

1. Start with a controllable clip

Use rights-cleared footage with a clear subject, stable motion and consistent lighting. Fast cuts, heavy blur, large occlusions and multiple simultaneous changes are harder to preserve.

2. Upload and describe one change

Open Magic Hour AI Video Editor, upload the clip and use the formula above. The current browser tool offers three free edits per day without sign-up; sign-in adds saved projects, account credits and more tools.

Use the Dashboard for saved, model-specific edits

For the signed-in workflow, open AI Video Editor in the Dashboard, upload your source video, and describe the change in Edit instructions. Select a model and supported resolution; choose a video section when trim controls are available. Review the displayed credit estimate, select Generate Video, then inspect the full completed clip before downloading.

A new prompt does not override a length or resolution restriction. Resolve the validation message for the selected model first. If the project is still processing, check its status before submitting the same edit again. The step-by-step Help Center guide distinguishes processing delays from failed outputs and links to the relevant recovery guidance.

3. Generate and inspect the full shot

Check the first, middle and last frames, then watch at normal speed and frame by frame around the edited region. Inspect identity, geometry, text, hands, edges, shadows, reflections, background continuity and motion.

4. Refine the smallest failing instruction

If the output changes unrelated details, reduce the request to one target and add explicit preservation rules. If a precise local edit still fails, use a workflow with selection or masking controls instead of repeatedly broadening the prompt.

5. Finish the production workflow

After the visual edit passes review, use a timeline editor for exact trims, sound, captions and sequencing. Use AI Video Extender to continue a shot or AI Video Expander to generate new area around the existing frame.

Current tool comparison

Tool	Prompt-Based (No Timeline)	Starting Paid Price
Magic Hour		Creator $19 monthly or $144/year
Runway	Partly; AI tools, but also a full editor	Standard $15 monthly or $144/year
Descript	Yes, with AI co-editor and text-based editing	$16/mo billed annually
Kapwing	Partly; AI tools inside a traditional editor	$16/mo billed annually

Magic Hour is the direct no-sign-up option in this table for prompt-based visual changes. Runway combines generative tools with a broader creative platform; Descript focuses on document-style and AI-assisted editing; Kapwing combines AI features with a browser timeline. Pricing and plan details were checked September 13, 2026 against Magic Hour, Runway, Descript and Kapwing. Recheck the linked pages before purchasing because plans change.

What vague prompts get wrong

‘Make it better’ has no target. Name the property to change and the desired result.
‘Remove everything in the background’ is too broad. Identify one object and describe how the revealed area should look.
‘Make the subject cooler’ is subjective. Specify lighting, wardrobe, palette, texture or another observable property.
Several edits in one prompt compete. Generate and approve one controlled change before the next.

Pre-download quality check

Continuity: the change remains stable from beginning to end.
Preservation: identity, action, framing and protected objects remain recognizable.
Integration: edges, perspective, lighting, shadows and reflections fit the scene.
Text and logos: every visible character and brand mark is correct in every frame.
Rights and disclosure: source media, likenesses, marks and intended use are authorized; disclose material synthetic edits where required.

Frequently asked questions

Yes. The current product page offers three free edits per day in the browser without sign-up. An account unlocks saved projects and account-specific credits; paid plans add more generations, longer clips and advanced controls.

No for most complete productions. Text prompts change visual content inside a clip; a timeline remains better for precise cuts, multi-clip sequencing, captions, transitions and audio timing.

It varies with the selected workflow, clip and queue. Use the estimate shown before generation and judge the finished clip rather than relying on a universal processing-time claim.

Yes, with a paid subscription, a credit-pack purchase, or a separately agreed paid usage-based arrangement, subject to Magic Hour’s Terms of Service. Output without one of those paid arrangements is limited to personal, non-commercial use. You still need rights to source footage, likenesses, logos, music and other inputs; ownership does not guarantee copyright protection.

AI Video Editor offers a no-sign-up browser demo and a signed-in Dashboard for prompt-based edits. Video-to-Video is the broader generation workflow for transforming existing footage with selectable models and settings.