About & Guide — Text Shorts Automatic

What this app does

This tool helps you turn a short video (≤ 60 seconds) into a vertical 1080×1920 clip with your custom text overlay. You can keep the original audio or replace it with your own track. The app runs in your browser, so your files never leave your device.

Highlights:

Vertical video canvas (1080×1920) with two fit modes: Contain (letterbox) and Cover (crop).
Optional blurred background when using Contain.
Smart text box with auto-fit, background styles (rounded/square), color and opacity, shadow and outline.
Replace video audio with your own file if you want.

Performance & memory tips

To keep the app fast and stable, follow these two simple rules:

Render one video at a time. Wait until the current render finishes before pressing “Generate” again or starting another render in a new tab/window. Why: canvas drawing and WebM encoding are CPU/GPU heavy; running several in parallel stacks the load and can cause stutter or tab crashes.
Avoid piling up many results in one tab. Each finished video stays in memory as a Blob (often ~10–60 MB for 15–60 s) until you close or refresh the page. After you download a result, start the next render. If the tab feels slow after a few renders, refresh to free memory.

Rule of thumb: batch videos sequentially, not in parallel; refresh the page every 2–3 long renders to keep memory fresh.

Using your own or free-to-use materials

You are responsible for the content you upload. Use your own footage/music or ensure that anything you add is free to use and properly attributed, if required.

Legal quick tips (not legal advice):

Check licenses for stock footage, music, and images. Look for terms like royalty-free, Creative Commons, or platform-specific licenses.
Attribution: some free licenses require you to credit the creator. Include credits in your video description.
Copyrighted music: most popular songs are copyrighted. Use licensed tracks or royalty-free alternatives.
Fair use is limited and context-dependent — when in doubt, use original or licensed material.

How to use the app (step-by-step)

Upload a video (≤ 60s). Optionally, upload an audio file to replace the original sound.
Enter your text. The app auto-wraps and fits the text box to keep it readable.
Pick styles: font, size, color, background, rounded vs. square, shadow/outline, and position (top/center/bottom).
Choose how the video fills the frame: Contain (no cropping; add blurred fill if you like) or Cover (fills the frame; may crop edges).
Click Generate Video. The progress bar and percent will show recording progress.
When done, preview the result and click Download to save a WebM file.

Tip: If generating seems slow, try shorter clips or smaller audio files.

Tips for best results

Short, punchy text works best. Keep lines concise for better readability.
Use text shadow or outline for contrast if the video is visually busy.
Try Cover for a full, cinematic look; use Contain + blurred background for wide videos.
Mind duration: shorter clips keep viewers engaged.

Audio & music tips

Want to add a voiceover from text? Use Text to Speech Automatic to quickly generate natural-sounding speech from your text. Download the audio file and upload it here as your custom audio track.
Replacing audio: upload a royalty-free track, your own music, or a voiceover. If your audio is shorter than the video, you can choose:
- Pad with silence (default): the video keeps its original length, and silence is added after your audio ends.
- Trim video to audio length: check the box under Audio File to make the video end when your audio ends.
If your audio is longer than the video, it will be trimmed to match the video length.
Levels and clarity: ensure your uploaded track isn’t too quiet or clipped. The app doesn’t normalize; set levels beforehand if needed.

Tip: Use the “Trim video to audio length” checkbox if you want your video to end exactly with your music or voiceover.

Export, download, and sharing

Format: the app records to WebM (VP8/VP9 + Opus). Most modern browsers and platforms support it.
Converting: if you need MP4, you can convert using a desktop tool (e.g., HandBrake or FFmpeg).
Naming: the file name is built from your text’s first words for easy identification.

FAQ

Q: Where is my data processed?
A: In your browser — no upload to a server.

Q: My video has no sound after generation.
A: Some sources don’t provide an audio track; try replacing audio with your own file.

Q: Generation fails on large files.
A: Try a shorter clip or a smaller audio file; browser memory can be limited.

Use & support

Enjoy the tool? You can support development: