Overview
Add subtitles to a video by generating them from speech or providing your own timed text in Custom SRT. Choose Burned Into Video to put subtitles in the video picture, or select SRT File or VTT File for a separate subtitle workflow. The video output is MP4. Set the speech language, appearance, or translation when needed, then check the result (especially names, numbers, specialist terms, placement, and timing) before sharing. Online upload and processing requires sign-in and an internet connection.
AI Video Subtitler can generate subtitles from video speech or process supplied timed text in Custom SRT. Set Speech Language, choose an Output option, and use the listed appearance and translation controls when they fit your task. The video output is MP4. Review the result against the speech; the configuration doesn’t establish an accuracy rate or guarantee correct wording or timing.
When to use
- Use AI Video Subtitler to generate subtitles from a video or provide your own text in Custom SRT. Choose the language, output, appearance, and translation settings that fit your task, then review the result.
- Decide how you’ll use the subtitles before processing. Choose Burned Into Video when you want the words in the video picture; choose SRT File or VTT File when your player or editing workflow accepts a separate subtitle file. The configured video output is MP4.
How to use
Open AI Video Subtitler and use its linked workspace. The online upload and processing path requires sign-in and an internet connection.
Provide one video file, up to 500 MB, in .mp4, .webm, .mkv, .avi, or .mov format. Set Speech Language to the known spoken language, or leave Auto-Detect selected. To use your own timed text, enter it in Custom SRT (optional — leave blank for auto-generate). Automatic subtitles need a video with audio; for a silent video, provide your own subtitle text. The listed extensions don’t establish codec or bit-depth support.
Under Output, choose Burned Into Video, SRT File, or VTT File. The video result is MP4; use a separate subtitle-file option when your destination accepts that file type. For burned subtitles, open Advanced Options to choose Font Size, Font Color, and Position (Bottom or Top). Under Translate Subtitles, choose a target language or leave Original Only selected. If you’re translating custom SRT, set Speech Language to the SRT’s source language; Auto-Detect isn’t accepted for that combination. Select Process, then download the result. Check names, numbers, specialist terms, placement against visible titles, and timing against the speech before publishing.
Settings reference
| Setting | Options | Default |
|---|---|---|
| Speech Language | auto: Auto-Detect en: English es: Spanish fr: French de: German it: Italian pt: Portuguese ja: Japanese ko: Korean zh: Chinese | auto |
| Custom SRT (optional — leave blank for auto-generate) | Text | Empty |
| Output | burned: Burned Into Video srt: SRT File vtt: VTT File | burned |
| Font Size | small: Small medium: Medium large: Large | medium |
| Font Color | white: White yellow: Yellow green: Green cyan: Cyan red: Red black: Black | white |
| Position | bottom: Bottom top: Top | bottom |
| Translate Subtitles | none: Original Only en: English es: Spanish fr: French de: German pt: Portuguese it: Italian ja: Japanese ko: Korean zh: Chinese ar: Arabic hi: Hindi ru: Russian | none |
Formats & limits
| Detail | Requirement |
|---|---|
| Input formats | .mp4, .webm, .mkv, .avi, .mov |
| Output formats | MP4 |
Access & cost
| Detail | Requirement |
|---|---|
| Processing mode | Online processing requires sign-in and an internet connection. |
| Online processing | Sign-in required; Internet connection required |
Examples & use cases
A video editor preparing an interview for viewers who need on-screen subtitles.
Subtitle an English interview
The .mp4 interview has English speech, and names and numbers matter to its audience.
.mp4 to MP4
- Speech Language:
- en
- Output:
- burned
- Font Size:
- medium
- Font Color:
- white
- Position:
- bottom
- Translate Subtitles:
- none
- Set Speech Language to English because the spoken language is known, and leave Custom SRT blank to generate subtitles from the video.
- Choose Burned Into Video with the listed medium, white, bottom appearance options. In the video result, check the names and numbers and compare the subtitle timing with the interview speech.
Expected outcome
You get a video result in MP4 format. Review the wording, placement, and timing in the interview before sharing it.
A producer preparing a silent .mov clip with existing on-screen titles.
Place supplied subtitles above lower-third titles
The clip has no speech to transcribe, and the producer has timed SRT text to place above lower-third titles.
.mov to MP4
- Speech Language:
- en
- Output:
- burned
- Font Size:
- medium
- Font Color:
- white
- Position:
- top
- Translate Subtitles:
- none
- Paste the prepared timed text into Custom SRT (optional — leave blank for auto-generate) so the supplied text is used instead of generated wording.
- Choose Burned Into Video and set Position to Top to keep subtitles away from the lower-third area. Inspect a section where the titles appear and check the supplied timing against the footage.
Expected outcome
You get a video result in MP4 format. Check whether the supplied text appears in the intended position and at the intended times.
A course creator preparing a Spanish-language tutorial for English-speaking viewers.
Prepare English subtitles from Spanish speech
The .mkv tutorial has Spanish speech and specialist terms that need careful review in the English subtitle result.
.mkv to MP4
- Speech Language:
- es
- Output:
- burned
- Font Size:
- medium
- Font Color:
- white
- Position:
- bottom
- Translate Subtitles:
- en
- Set Speech Language to Spanish because that’s the known spoken language, and leave Custom SRT blank to generate subtitles from the video.
- Set Translate Subtitles to English and choose Burned Into Video for a video result. Check names, specialist terms, and subtitle timing against the Spanish audio.
Expected outcome
You get a video result in MP4 format. Review the translated wording and timing against the tutorial before using or publishing it.
More ways to use it
- A creator preparing a spoken video for viewers who may watch with the sound off.: The creator wants words included in the video picture rather than relying on a separate subtitle file. Choose Burned Into Video, then inspect the MP4 result to check subtitle wording and timing against the speech. Speech Language: auto, Output: burned, Translate Subtitles: none.
- A training team preparing subtitles in another language for learners outside the video’s source-language audience.: The team wants to review translated names and technical terms before using the video with learners. Set Speech Language to the known source language and choose a translation target. Review the translated wording and timing against the spoken audio before using the MP4 result. Speech Language: es, Output: burned, Translate Subtitles: en.
Troubleshooting
You have your own subtitle text to use instead of generated wording.
Try this: Enter your timed subtitle text in Custom SRT (optional — leave blank for auto-generate).
What to expect: The Custom SRT control contains the text you supplied for processing.
A subtitle appears in the same area as a title near the bottom of the video.
Try this: In Advanced Options, set Position to Top, then inspect the result where the title appears.
What to expect: The selected Position value is Top. Check the resulting placement against the existing title.
Privacy
Online processing uploads files. Completed results may remain available for later download. See Privacy Policy for current file-handling and retention details. Check the processing mode before starting.
Frequently asked questions
Can I change where burned subtitles sit?
Yes. Under Position, choose Bottom or Top. Check the result where existing titles appear to see whether the placement works for your video.
Can I download subtitles without exporting another video?
SRT File and VTT File are choices under Output for separate subtitle files. The configured video output is MP4; check the workspace for the available download options.
Can I generate subtitles from a silent video?
Automatic subtitles need audio. For a silent video, provide your own subtitle text in Custom SRT.
How are subtitles different from accessibility captions?
Subtitles usually convey spoken words. Accessibility captions can also identify speakers and meaningful sounds, such as an alarm or laughter. Check whether your audience needs those details; speech transcription alone may not cover them.
How do I add subtitles to a video automatically?
Provide a supported video, leave Custom SRT blank, and choose a Speech Language or leave Auto-Detect selected. Choose an Output option, select Process, then review the result against the speech.
What video formats can I provide?
The registered input formats are .mp4, .webm, .mkv, .avi, and .mov. These extensions don’t establish codec or bit-depth support.
Which subtitle languages can I choose?
Speech Language offers Auto-Detect, English, Spanish, French, German, Italian, Portuguese, Japanese, Korean, and Chinese. Translate Subtitles offers Original Only and targets including English, Spanish, French, German, Portuguese, Italian, Japanese, Korean, Chinese, Arabic, Hindi, and Russian. Review translated names and specialist terms before using the result.
Can I use my own subtitle text?
Yes. Enter your timed SRT text in Custom SRT (optional — leave blank for auto-generate). SRT File and VTT File are also listed as Output choices for separate subtitle files.
How accurate are automatically generated subtitles?
No accuracy rate is specified. Review the result against the speech, paying particular attention to names, numbers, specialist terms, and timing before sharing.
Does the online workflow require sign-in?
This tool runs online and requires sign-in and an internet connection. Review the processing charge shown in the workspace before starting.
How are uploaded videos and results handled?
Online processing uploads files. Completed results may remain available for later download. See Privacy Policy for current file-handling and retention details. Check the processing mode before starting.
What is the maximum video file size?
The configured limit is 500 MB, and the workflow accepts one video file at a time. Use a registered format: .mp4, .webm, .mkv, .avi, or .mov.
Can I translate subtitles into another language?
Yes. Translate Subtitles offers targets including English, Spanish, French, German, Portuguese, Italian, Japanese, Korean, Chinese, Arabic, Hindi, and Russian. Check the translated wording and timing before using the result.