AI Video Tools Explained: Text-to-Video, Avatars and AI Editing

"AI video" is used to describe three quite different kinds of product. Some tools generate brand-new footage from a text prompt. Others create a digital presenter who reads your script. A third group helps you edit real footage faster. Choosing well starts with knowing which kind you need. This guide explains each category, gives examples with prices from official pages as of October 2026, and covers the practical and ethical points to consider.

The three categories at a glance

  • Text-to-video (generative video): you describe a scene, or upload an image, and the model generates a short clip. Examples: Runway, Google Flow (in Google AI plans), Adobe Firefly video, Midjourney video.
  • AI avatars and presenters: you write a script; a realistic or stylised avatar presents it, often in many languages. Example: Synthesia.
  • AI-assisted editing: you bring your own recordings; AI transcribes, removes filler words, cleans audio, creates clips and translates. Example: Descript.

Voice tools such as ElevenLabs sit alongside all three, providing narration, dubbing and sound effects.

Text-to-video: generating new footage

What it is good for

Generative video is useful for concept visuals, b-roll, mood pieces, short social clips, storyboards and creative experiments. It is less suited to anything that must show a real product, a real place or a real person accurately, because the model invents what it shows.

How pricing usually works

Generative video is expensive to compute, so nearly every service uses credits that are spent per second of output. Some examples from official sources:

  • Runway: its FAQ says Gen-4.5 uses 12 credits per second of video. The Free plan gives 125 one-time credits; Standard is $15/month ($12 billed annually) with 625 credits per month, which Runway equates to about 52 seconds of Gen-4.5; Pro is $35/month ($28 annually) with 2,250 credits; Max is $95/month ($76 annually) with 9,500 credits that can roll over for one month. Runway's plans also list access to third-party models such as Kling 3.0 and Nano Banana Pro.
  • Adobe Firefly: Adobe's generative credits FAQ lists Generate Video at 100 credits per second at 1080p, 50 at 720p and 20 at 540p. Firefly Standard includes 2,000 premium credits per month, Pro 4,000, Pro Plus 10,000 and Premium 50,000.
  • Google Flow: Google's subscription page lists 200 Flow credits per month with Google AI Plus ($4.99/month) and 1,000 with Google AI Pro ($19.99/month), plus video generation in the Gemini app on those plans. Google AI Ultra adds higher limits and, according to Google, video generation with Veo 3.1.
  • Midjourney: its plan comparison shows video generation on all plans, HD video from Standard upwards, and unlimited "Relax" video on Pro and Mega.

The practical lesson: a few seconds of finished footage can take many attempts. Budget for several generations per usable clip.

Tips for better results

  1. Describe the shot like a director: subject, action, setting, camera movement, lighting and mood.
  2. Start from a reference image where the tool allows it; it improves consistency.
  3. Keep clips short and plan to edit them together, rather than expecting one long perfect take.
  4. Generate at lower resolution while experimenting, then upscale the chosen take.

AI avatars: presenters from a script

What it is good for

Avatar platforms suit training, onboarding, internal communications, product explainers and multilingual updates, where the message matters more than cinematic footage and you need to update videos often without reshooting.

Example: Synthesia

Synthesia's pricing page lists a free Basic plan with 10 minutes of video creation or dubbing and videos that carry a Synthesia watermark. Starter is $29/month billed monthly and lists 125+ stock avatars, downloads and logo removal. Pro is $89/month billed monthly with 6,000 credits, 180+ avatars and up to five personal avatars. Yearly billing is cheaper. Synthesia now uses a shared credit pool across video, dubbing and other features.

What to check

  • Language and voice options for your audience.
  • Whether you can create a custom avatar of yourself, and what consent process the vendor requires.
  • Brand controls (fonts, colours, logos) and how easy it is to update a video later.
  • Export formats and integration with your learning platform or video host.

AI-assisted editing: working with real footage

What it is good for

If you record podcasts, interviews, webinars, tutorials or talking-head videos, AI editing often saves more time than generating anything new. The core idea is text-based editing: the tool transcribes your recording, and you edit the video by editing the transcript.

Example: Descript

Descript's pricing page lists features such as Remove Filler Words, Studio Sound, Eye Contact, Green Screen, automatic multicam and clip creation, plus an AI co-editor called Underlord. Plans are Free (1 hour of media per month, 720p export), Hobbyist ($16/month billed annually, $24 monthly), Creator ($24 annually, $35 monthly) and Business ($50 annually, $65 monthly). Translation and dubbing into 30+ languages and custom avatars are listed on Business.

Voice and audio tools

Narration, dubbing and sound effects are often what make an AI video usable. ElevenLabs lists text-to-speech, speech-to-text, sound effects, voice design and music across its plans, with a commercial licence and instant voice cloning from the Starter plan ($6/month) and professional voice cloning from Creator ($22/month). Descript and Runway also include voice features.

Example workflow: a 60-second product explainer

To see how the categories fit together, here is one way a small team might produce a short explainer without a film crew:

  1. Script: draft a 150-word script with a general AI assistant, then edit it yourself for accuracy and tone.
  2. Presenter or voice: either record yourself on a phone, or use an avatar platform or a text-to-speech voice for narration.
  3. Visuals: use real screen recordings or product shots for anything factual, and generated b-roll only for abstract or mood shots.
  4. Edit: assemble everything in an AI-assisted editor, remove filler words, add captions and export versions for each platform.
  5. Review: have someone who knows the product watch it for errors before publishing, and add a disclosure if an AI presenter is used.

Choosing the right category

  • "I need eye-catching visuals or b-roll": text-to-video.
  • "I need a presenter explaining something, in several languages": avatar platform.
  • "I already record content and editing takes too long": AI-assisted editor.
  • "I need narration or translation for existing videos": voice and dubbing tool.

Many creators combine two: for example, an editor for their recordings plus occasional generated b-roll.

Ethics, consent and disclosure

Video is where AI misuse can do the most harm, so a few rules are essential:

  • Only clone voices or faces with explicit consent. Reputable vendors require verification for custom avatars and professional voice clones.
  • Never impersonate real people or create misleading footage of real events.
  • Disclose AI-generated presenters and footage when viewers could be misled, especially in advertising, news or testimonials.
  • Follow platform rules. Major social and video platforms have policies requiring disclosure of realistic synthetic content.
  • Check commercial rights on your plan before using footage in ads or client work.

Practical budgeting advice

  1. Use free tiers and one-time credits to learn how many attempts you typically need.
  2. Pick the lowest plan that removes the watermark and gives commercial rights, if you need them.
  3. Remember that monthly credits often do not roll over; Runway says Standard and Pro credits reset each billing cycle, and Adobe says generative credits do not roll over.
  4. Avoid annual plans until you know your monthly usage.

Bottom line

Decide first whether you need new footage, a presenter or faster editing; the right tool follows from that. Expect credit-based pricing for generated video, plan for multiple attempts, and treat consent and disclosure as non-negotiable. Compare options in our best AI video tools category, and see AI marketing tools if your videos are for campaigns.