How to add subtitles as text overlays to a video

You want subtitles that stay visible in the picture when someone plays your video, even if they do not turn on a caption track. These are often called burned-in subtitles or text overlays. They are useful for social clips and presentations, but viewers cannot turn them off or change their size.

TooLab does not currently have a video editor. You will need a video editor that runs on your device and supports text layers. You can use TooLab's Photo Editor to prepare a still title card or graphic, but it cannot add timed subtitles to a video.

Add subtitles as timed text overlays

1. Choose a local video editor. Use an editor that lets you add text over a video clip and set when that text appears and disappears. If you need a title card or a separate graphic, you can make one in the Photo Editor. It is not a substitute for timed text in a video editor.
2. Prepare a clean copy of the video. Keep the original file unchanged, then open a copy in your editor. If keeping the footage on your device matters, check that the editor processes files locally and does not upload them for editing or cloud storage.
3. Write and divide the subtitles. Put one short phrase or sentence in each caption. Split long speech into readable pieces, and keep each line short enough to scan without rushing. Two lines is usually a sensible limit for a small video frame.
4. Add a text layer for the first caption. Place it over the video near the bottom, but leave room for faces, existing graphics, and platform controls. Set its start and end times to match the spoken words, then repeat for the next caption. Some editors let you duplicate a text layer so the style stays consistent.
5. Preview and export. Watch the full video with sound off, then listen with the subtitles hidden if your editor allows it. Check that the words match the speech and that each caption stays on screen long enough to read. Export a new video file and watch that exported copy before sharing it.

Do not use one long text layer for the whole dialogue unless the video is very short. Captions need to change with the speech. A single paragraph left on screen may cover the picture and is difficult to follow.

Choose the right kind of subtitles

Text overlays that are part of the picture

These captions are rendered into the video image when you export. They appear in ordinary players and stay visible in a social media upload, because they are part of each frame. Viewers generally cannot switch them off, resize them, or select the words. If you misspell a caption, you need to edit the project and export again.

A separate subtitle track or file

A subtitle track can often be turned on or off and may be easier to translate or revise. A separate file, such as an SRT file, is not necessarily included in the video itself. The player or platform needs to support it, and the file may need to be shared alongside the video. Choose this option when viewers should be able to control captions or when accessibility requirements call for selectable captions.

A still image with text

A single image with words on it is useful for a title card, not for timed dialogue. It does not update as people speak, and text baked into an image may be hard to correct later. For spoken subtitles, use editable text layers in the video timeline rather than making a separate picture for every line.

Fix subtitles that are hard to read or out of sync

1. Shorten a crowded caption. Split a long sentence at a natural pause or phrase. Avoid covering the entire bottom of the frame with several lines of small text.
2. Increase contrast. Light text over a bright scene can disappear, and dark text over a dark scene can do the same. Use a consistent outline, shadow, or subtle background behind the letters if your editor offers one. Check the result over both light and dark parts of the video.
3. Move text away from faces and controls. Keep captions in a predictable position, usually near the lower edge with a little padding. For vertical video, preview on a phone-sized frame because app buttons and captions from the platform may cover the bottom area.
4. Adjust the caption timing. If a line appears before the person speaks, move its start later. If it remains after the sentence ends, shorten its duration. Make the change small, preview that section, and repeat until the text follows the speech naturally.
5. Check the exported file, not just the editor preview. Export settings, cropping, or a different frame size can make text appear smaller or closer to an edge. Watch the finished file at the size people are likely to use, and export again if the text is clipped or too small.
6. Check the editor's file handling. If footage must stay local, look for cloud project storage, upload-based editing, or automatic syncing in the editor's privacy or account settings. Do not assume an app is local just because you opened it on your computer.

Make overlays readable on different screens

Text that looks large on a desktop preview may be tiny on a phone. Preview the video at its intended size, and leave a safe margin from every edge. The bottom edge is especially risky because video apps may place playback controls or account information over it. Also check that the font is plain enough to read quickly, with clear letter shapes and enough space between lines.

Keep the wording faithful to what is said, including names and important numbers. If you need to show sound effects or identify a speaker, add those details only when they help viewers understand the scene. A brief caption such as [door closes] can convey a relevant sound, while unrelated background details may make the screen busier.

Keep the editable project as well as the exported video. That gives you a way to correct a typo, adjust timing, or make another version without rebuilding the overlays from scratch.