> ## Documentation Index
> Fetch the complete documentation index at: https://captions.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Format Requirements and Feature Availability by Platform
> Discover the full range of Captions plans by platform
## Format Requirements & Usage Limits
| Category | iOS | Captions on Web | Desktop (Legacy) |
| -------------------------------------------------------------- | ---------------------------------------------- | :-------------------------------- | :---------------------------------------------------------------------------------------------------------------------- |
| **Format Support** | MP4 and MOV (non-HDR and HDR) | MP4 and MOV (non-HDR) | MP4 and MOV (non-HDR) |
| **Resolution** | 4K and below | 4K and below | 2K and below |
| **Manual Editor Aspect Ratio Limits** | 16:9
9:16
1:1
4:5 | Not available | 16:9
9:16
1:1
4:5 |
| **[AI Edit](/help/docs/project/ai-edit) Aspect Ratio Limits** | Vertical 9:16
Landscape 16:9 | Vertical 9:16
Landscape 16:9 | Vertical 9:16 |
| **Manual Editor Duration Limit** | Up to 10 minutes | Not available | - Same language captions: Up to 10 minutes
- Translations/[dubbing](/help/docs/captions/dubbing): Up to 5 minutes |
| **AI Edit Limit** | Max. 2 minute | Max. 1 minute | Max. 1 minute |
| **[AI Creator](/help/docs/project/ai-creator) Duration Limit** | Max. 1 minute | Not available | Max. 1 minute |
| **AI Creator Script Limit** | 10–800 characters (incl. spaces & line breaks) | Not available | 10–800 characters (incl. spaces & line breaks) |
| **AI Echo** | Audio Recording: 1 min | Not available | Not available |
## Feature Availability by Platform
While the [Captions Plans page](https://www.captions.ai/plans) outlines the full list of features offered across subscriptions, **not all features are available on the web and [Captions Web (Legacy)](/help/docs/app/web-legacy) versions of the app**.
### **Generate Videos and Create Projects**
| Feature | Description | iOS | Captions on Web | Desktop |
| ----------------------------------------------------- | --------------------------------------------------------------------------------------------- | --- | --------------- | :------ |
| [Prompt to Video](/help/docs/project/mirage-edit) | Go from 0 to video. Automatically generate a video and auto-edit it based on an editing style | ✅ | ✅ | ❌ |
| [AI Creator](/help/docs/project/ai-creator) | Generate videos based on text | ✅ | ✅ | ✅ |
| [AI Twins](/help/docs/project/ai-twin) | Generate an AI Clone of yourself and use it to generate videos | ✅ | ❌ | ✅ |
| [AI Ads](/help/docs/project/ai-ads) | Generate UGC-style ads with ease for your product | ✅ | ❌ | ✅ |
| [AI Shorts](/help/docs/project/ai-shorts) | Extract viral worthy clips from your long-form videos | ✅ | ❌ | ✅ |
| [Reddit to video](/help/docs/project/reddit-to-video) | Turn Reddit posts into videos | ✅ | ❌ | ❌ |
| [Generate captions](/help/docs/captions/add-captions) | Generate captions for your video | ✅ | ❌ | ✅ |
| [AI Dubbing](/help/docs/captions/dubbing) | Dub the audio of your video into different languages | ✅ | ❌ | ✅ |
### **Video Creation and Recording**
| Feature | Description | iOS | Captions on Web | Desktop |
| -------------------------------------------- | ------------------------------------------------------------- | --- | --------------- | :------ |
| [Captions Camera](/help/docs/project/camera) | Use Captions Camera to record your videos directly in the app | ✅ | ❌ | ❌ |
| [Teleprompter](/help/docs/project/camera) | Built-in teleprompter to help read scripts during recording | ✅ | ❌ | ❌ |
| [Scripts](/help/docs/project/script) | Generate video scripts based on the context of your project | ✅ | ✅ | ❌ |
### **AI Editing Features**
| Feature | Description | iOS | Captions on Web | Desktop |
| ----------------------------------------------- | ---------------------------------------------------------------- | --- | --------------- | :------ |
| [AI Edit](/help/docs/project/ai-edit) | Automatically edit your video with professional editing styles | ✅ | ✅ | ✅ |
| AI Trim | Automatically remove pauses and “uhms” from your video | ✅ | ❌ | ❌ |
| [AI Voiceover](/help/docs/audio/voiceover) | Generate a voiceover based on text for your video | ✅ | ❌ | ✅ |
| [AI Zoom](/help/docs/visual/zoom) | Automatically add zooms to the most engaging parts of your video | ✅ | ❌ | ❌ |
| [AI Censor](/help/docs/audio/censor) | Automatically censor curse words in your video | ✅ | ❌ | ❌ |
| [AI Denoise](/help/docs/audio/denoise) | Remove background noises and echoes while boosting spoken audio | ✅ | ❌ | ✅ |
| [AI Sound Effects](/help/docs/audio/sounds) | Generate sound effects for key parts of your video | ✅ | ❌ | ✅ |
| [AI Music](/help/docs/audio/music) | Generate music tracks based on text | ✅ | ❌ | ✅ |
| [AI Cutout](/help/docs/visual/cutout) | Automatically remove and replace the background of your video | ✅ | ❌ | ✅ |
| [AI Eye Contact](/help/docs/visual/eye-contact) | Adjust eye gaze using AI to simulate looking into the camera | ✅ | ❌ | ✅ |
### **Manual Editing Features**
| Feature | Description | iOS | Captions on Web | Desktop |
| --------------------------------------------------- | ---------------------------------------------------------------------------- | --- | --------------- | :------ |
| [Manual Trim](/help/docs/timeline/trim) | Manually trim your video, overlays, and music tracks | ✅ | ❌ | ✅ |
| [Keyframes](/help/docs/captions/keyframes) | Animate the position change of your captions or video/image overlays | ✅ | ❌ | ❌ |
| [Custom Text](/help/docs/visual/text) | Add custom text overlays to your project | ✅ | ❌ | ❌ |
| Content Fit | Adjust the framing of your content | ✅ | ❌ | ❌ |
| Add/Delete/Split/Merge Clips | Manually edit video tracks in the [timeline](/help/docs/timeline/add-delete) | ✅ | ❌ | ✅ |
| [Reorder Shots](/help/docs/timeline/shot-reorder) | Change the order of shots in your timeline | ✅ | ❌ | ✅ |
| [Shots Transition](/help/docs/timeline/transitions) | Adjust transitions between video shots | ✅ | ❌ | ✅ |
| Extract Audio | Manage audio of added media overlays | ✅ | ❌ | ✅ |
| [Title](/help/docs/visual/title) | Automatically add a title at the beginning of your video | ✅ | ❌ | ❌ |
| Import Voiceover | Import external [voiceover](/help/docs/audio/voiceover) tracks | ✅ | ❌ | ❌ |
| Import Sound Effects | Import [sound effects](/help/docs/audio/sounds) | ✅ | ❌ | ❌ |
| Import Music | Import [music](/help/docs/audio/music) tracks | ✅ | ❌ | ❌ |
| [Media Overlays](/help/docs/visual/media) | Generate, add, or replace clips and images in your project | ✅ | ❌ | ✅ |
| [Undo/Redo](/help/docs/settings/undo-and-redo) | Undo or redo your recent actions in Captions | ✅ | ❌ | ❌ |
### **Project Management**
| Feature | Description | iOS | Captions on Web | Desktop |
| ---------------------------------------------------- | ------------------------------------------------------------------------- | --- | --------------- | :------ |
| Duplicate projects | Duplicate your existing projects | ✅ | ❌ | ❌ |
| Project description and hashtags | Generate engaging descriptions and hashtags for your video | ✅ | ❌ | ❌ |
| Copy Transcripts | Copy all the generated captions for your project as text | ✅ | ❌ | ❌ |
| [Scale](/help/docs/settings/scale-and-format) | Adjust the aspect ratio and format of your project | ✅ | ❌ | ✅ |
| [Captions Cloud](/help/docs/settings/captions-cloud) | Cloud-based backup of all clips imported or recorded with Captions Camera | ✅ | ✅ | ❌ |