Format Requirements and Feature Availability by Platform - Captions Help Center

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 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: Up to 5 minutes
AI Edit Limit	Max. 2 minute	Max. 1 minute	Max. 1 minute
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 outlines the full list of features offered across subscriptions, not all features are available on the web and Captions Web (Legacy) versions of the app.

Generate Videos and Create Projects

Feature	Description	iOS	Captions on Web	Desktop
Prompt to Video	Go from 0 to video. Automatically generate a video and auto-edit it based on an editing style	✅	✅	❌
AI Creator	Generate videos based on text	✅	✅	✅
AI Twins	Generate an AI Clone of yourself and use it to generate videos	✅	❌	✅
AI Ads	Generate UGC-style ads with ease for your product	✅	❌	✅
AI Shorts	Extract viral worthy clips from your long-form videos	✅	❌	✅
Reddit to video	Turn Reddit posts into videos	✅	❌	❌
Generate captions	Generate captions for your video	✅	❌	✅
AI Dubbing	Dub the audio of your video into different languages	✅	❌	✅

Video Creation and Recording

Feature	Description	iOS	Captions on Web	Desktop
Captions Camera	Use Captions Camera to record your videos directly in the app	✅	❌	❌
Teleprompter	Built-in teleprompter to help read scripts during recording	✅	❌	❌
Scripts	Generate video scripts based on the context of your project	✅	✅	❌

AI Editing Features

Feature	Description	iOS	Captions on Web	Desktop
AI Edit	Automatically edit your video with professional editing styles	✅	✅	✅
AI Trim	Automatically remove pauses and “uhms” from your video	✅	❌	❌
AI Voiceover	Generate a voiceover based on text for your video	✅	❌	✅
AI Zoom	Automatically add zooms to the most engaging parts of your video	✅	❌	❌
AI Censor	Automatically censor curse words in your video	✅	❌	❌
AI Denoise	Remove background noises and echoes while boosting spoken audio	✅	❌	✅
AI Sound Effects	Generate sound effects for key parts of your video	✅	❌	✅
AI Music	Generate music tracks based on text	✅	❌	✅
AI Cutout	Automatically remove and replace the background of your video	✅	❌	✅
AI 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	Manually trim your video, overlays, and music tracks	✅	❌	✅
Keyframes	Animate the position change of your captions or video/image overlays	✅	❌	❌
Custom 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	✅	❌	✅
Reorder Shots	Change the order of shots in your timeline	✅	❌	✅
Shots Transition	Adjust transitions between video shots	✅	❌	✅
Extract Audio	Manage audio of added media overlays	✅	❌	✅
Title	Automatically add a title at the beginning of your video	✅	❌	❌
Import Voiceover	Import external voiceover tracks	✅	❌	❌
Import Sound Effects	Import sound effects	✅	❌	❌
Import Music	Import music tracks	✅	❌	❌
Media Overlays	Generate, add, or replace clips and images in your project	✅	❌	✅
Undo/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	Adjust the aspect ratio and format of your project	✅	❌	✅
Captions Cloud	Cloud-based backup of all clips imported or recorded with Captions Camera	✅	✅	❌

Last modified on August 18, 2026