How to Make a Motion Video with AI Subtitles in the Browser

You have a folder of photos or short clips and you want to turn them into a smooth motion video with captions. In this guide, you will learn how to do that in the browser with video97, a free AI video editor that works on any device. No downloads are needed, and the final result is an MP4 file you can share on social media.

This workflow is perfect for creators who want to repurpose still images into engaging content. You will combine AI-powered motion effects, automatic subtitles, and a simple timeline to produce a polished video in minutes. Let's go step by step.

1. Upload Your Photos or Short Clips to the Online Video Editor

Open video97 in your browser. The interface is clean and built for speed. Click the upload button on the main screen and select the images and short clips you want to use. You can also drag and drop files directly into the browser window.

For a motion video, choose high-resolution photos with enough detail. The AI will need room to zoom and pan without losing quality. Short clips work too, but the motion effects will be applied differently. If you plan to add subtitles, consider using photos that relate to the spoken words.

Once your files are uploaded, they appear in the media library. Drag them to the timeline at the bottom. video97 supports common formats like JPG, PNG, MP4, and WebM. There is no limit on the number of files for the free plan, but longer videos may take more time to export.

2. Apply Motion Effects to Make a Motion Video

With your clips on the timeline, select the first segment. Look for the "Motion" tab in the right-hand panel. Here you will find AI-generated motion presets such as slow zoom, smooth pan, and subtle rotation. You can also create a custom animation by adjusting the start and end positions of the frame.

These motion effects are often called Ken Burns effects. They bring static photos to life. For a cohesive look, apply the same motion style to all your images. video97 lets you copy effects from one clip and paste them onto others, saving you time.

If you are using AI video generation, you can also let the tool suggest motion patterns based on the content. Select the clip and click "Auto Motion" to let the AI determine the best movement. This works particularly well for landscapes, portraits, and product shots. The preview updates in real time, so you can see exactly how the motion video will feel.

3. Generate Subtitles with AI or Add Them Manually

Now is the time to add text to your video. video97 has a feature called "Subtitle AI" that automatically transcribes the audio from your video. If you have a voice-over or narration, the AI will create a subtitle track with timestamps. You can edit any line right in the timeline.

If your motion video has no audio yet, you can still add subtitles manually. Click the "Text" button in the toolbar and choose a subtitle style. Type your caption, adjust the duration, and place it on the timeline. Repeat for each scene.

For most creators, the AI subtitle generator is the fastest way to add subtitles to video. It supports multiple languages and works well with clear audio. After the transcription appears, you can correct words, change line breaks, and set the display time for each subtitle block. The subtitles will stay in sync with your motion effects when you move clips around.

4. Customize Subtitle Style and Timing

Good subtitles are easy to read and match the mood of your video. In video97, select any subtitle block to open the style options. You can change the font, size, color, background, and position. For social media, place subtitles in the safe area near the bottom center so they stay visible on mobile devices.

To keep a consistent look, create a subtitle style and apply it to all blocks. You can also use the "Smart Arrange" button to automatically adjust timing if you shortened or extended clips. This is a huge advantage over manual video editors.

Subtitles are not just for accessibility. They reinforce the message and help viewers watch without sound. Many social media platforms auto-play videos on mute, so well-designed subtitles can increase engagement. The AI will even suggest splitting long sentences into smaller chunks for better readability.

5. Add Music or AI Voice-Over to Complete the Video

A motion video often needs a soundtrack. video97 includes a library of royalty-free music tracks that you can search by mood or duration. Drag a track onto the audio timeline. You can trim it to fit the video length and adjust the volume so it does not overpower the subtitles.

If you want to add a voice-over, use the AI voice generator. Type your script, pick a voice, and let the AI speak it. This is a fast way to create narration without recording. The voice-over will automatically sync with your subtitle track. You can also record your own voice directly in the browser with a microphone.

Remember to include audio for the AI subtitle feature to work automatically. If you use background music only, manual subtitles are the way to go. But if you use a voice-over, the AI can generate all captions for you in one click.

6. Export as MP4 and Share Your Motion Video

Once you are happy with the motion effects, subtitles, and audio, click the "Export" button in the top-right corner. Choose the resolution and frame rate. For social media, 1080p at 30fps is a safe choice. video97 will render the video in the browser and download the MP4 file to your device.

The export time depends on the length of your video and the number of effects. Keep your project under 5 minutes for faster render times. After downloading, you can upload the video to Instagram, TikTok, YouTube, or any platform that accepts MP4.

Because video97 runs entirely in the browser, your source files are not sent to a server for processing. This makes the tool a good option for sensitive content. You can close the tab at any time, but make sure you save your project to the cloud if you want to continue later.

FAQ

Can I use video97 for free?

Yes, video97 is free to use in the browser. The free plan includes access to motion effects, AI subtitles, and export without a watermark. Premium features like advanced AI voice-over are available, but you can complete this entire workflow without paying anything.

How accurate are the AI-generated subtitles?

The accuracy depends on the audio quality and the language you use. Clear speech and a quiet background give the best results. In most cases, the AI transcription is accurate enough that you only need to fix a few words. You can always edit the subtitle text manually before exporting.

Can I make a motion video without using AI?

Yes, you can manually set the motion effects for each clip. However, the AI tools in video97 make the process much faster. The auto motion and subtitle generator are especially helpful when you are working with many images or long narration. Use them to save time and focus on the creative side.