Audio ASR: speech to subtitles
Choose this when the dialogue is in the soundtrack and usable captions are not already visible.
- Select the spoken source language
- Generate and review timed subtitle cues
- Check accents, music, and overlapping voices
AI Subtitle Generator for Speech and Burned-In Captions
Generate subtitles from speech with ASR, or extract burned-in captions with Video OCR. Review the timed cues and download editable SRT files for publishing, translation, or dubbing.
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≤1GB, ≤15min (mp4、avi、mov、mkv、mpg)
How to Generate Subtitles in Three Steps
Generate accurate AI subtitles in 3 easy steps with Weydub
01
Upload Video
- Upload a video from your device or use a supported video link. Check the current upload limits before submission.
02
Choose Generation Settings
- Select the source language. Choose audio ASR for speech or Video OCR for visible subtitles.
- For OCR, check the subtitle region; choose review and speaker options where available.
03
Process & Download
- Review the recognized text and cue timing, then edit or download the SRT file. Continue to translation or dubbing when needed.
Should you generate subtitles with ASR or OCR?
Use the source that contains the dialogue you need. Audio ASR and Video OCR are separate modes: one listens to speech, the other reads visible subtitles.
| Source or task | Where to start |
|---|---|
| A video with clear dialogue | Start with ASR. Review specialist terms, names, and quiet speech. |
| A subtitled short drama | Start with OCR when the visible subtitles are the source you want to recover. Check subtitle region and line boundaries. |
| Noisy speech but readable captions | Consider OCR rather than relying on the noisy audio alone. The modes do not automatically fuse into one result. |
| Several speakers | Use supported speaker labeling and review speaker changes against the video before dubbing. |
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Why Choose Weydub to Generate Subtitles?
A useful subtitle file needs more than recognized words. Weydub provides separate OCR and ASR workflows, timed cues, contextual review, and speaker controls to prepare subtitles for editing and localization.
Learn how Weydub turns Video OCR or audio ASR into timed, subtitle-ready SRT files.
| Published test metric | Weydub Video OCR | Audio-only ASR baseline |
|---|---|---|
| Character accuracy | 98.25% | 92.14% |
| Strict reference-cue exact recall | 98.92% | 67.74% |
From Weydub's 10-episode short-drama comparison against an editorial subtitle reference. The audio baseline used ElevenLabs Scribe v2 on separated vocals. Read the test setup and results.
Audio Preparation for Speech Recognition
Clear dialogue helps speech recognition. Background music, overlapping voices and distortion can still affect the result; compare uncertain words with the original audio.
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Subtitle Segmentation and Text Review
Subtitle segmentation helps separate visible text into timed cues. Review the selected subtitle region and check product labels or scene text that should not become dialogue subtitles.
Generate subtitles nowRecognition Models for Different Source Material
Select the recognition settings for the source material instead of treating every video alike. Dialogue recorded in a quiet room, emotional short-drama speech, and subtitles embedded in the picture create different recognition and review needs.
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Contextual Review with LLM Calibration
LLM calibration can help review context and wording. Check names, numbers and specialist terms against the source because automated corrections can also introduce errors.
Generate subtitles nowTwo Independent Generation Modes: Video OCR or Audio ASR
Choose Video OCR to read subtitles already visible in the frames. Choose audio ASR to transcribe the soundtrack. Both produce editable timed cues, but they use different source signals and controls. Compare a short sample when the best source is unclear.
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Identify and Review Different Speakers
Speaker labeling helps organize multi-speaker dialogue. Review speaker changes against the video, especially when voices overlap or speakers sound similar.
Generate subtitles nowFrom Source Subtitles to a Localized Video
Review your source subtitles first, then continue to translation, text removal, dubbing, and export. Keeping these steps in one workflow helps avoid passing missed lines and timing errors into the final video.
Project Management & Batch Processing
Manage projects and assets. Batch upload, process, and translate hundreds of videos simultaneously, boosting large-scale efficiency.
Automated Editing & Export
Auto-render and sync video, subtitles, AI dubs, and music. Ensures precise A/V alignment. Export project files compatible with professional NLEs (like Jianying/CapCut).
Subtitles for Short Dramas, Social Videos, and Courses
Short Drama Platforms - Expand Global Audience
For short dramas with visible subtitles, use Video OCR to create timed text for localization. Review character names, dialogue continuity and episode terminology before translating for apps or YouTube.
TikTok Sellers - Learn from Top Ad Copy
For TikTok ads you own or are authorized to use, extract visible captions with OCR or generate subtitles from speech with ASR. Check product names, prices and promotional claims against the video before adapting the copy.
Social Media Creators - Overcome Silent Playback
Make spoken content readable during silent playback. Review subtitle timing and line breaks, then preview the vertical video to keep captions clear of faces, products and platform controls.
Educators - Build Accessible Courses
Generate subtitle drafts for lessons and check technical terms against the teaching material. Review timing, speaker changes and relevant sound descriptions before publishing an accessible version.
Influencer Agencies (MCNs) - Speed Up Content Compliance
Use searchable subtitle drafts to locate product mentions and statements in creator videos. Compare flagged passages with the original footage and keep human brand and compliance approval in the workflow.
Generate Subtitles for Multiple Videos or Through API
Short-drama episodes and content libraries need consistent source settings. Start with a sample, review its cues, and then use batch processing or an asynchronous API workflow for the remaining files. Check account access and task limits before submitting a batch.
Explore the API · Open the workbenchBefore you process the full batch
- Choose OCR or ASR for the actual source, then test a representative clip.
- Review missing cues, repeated lines, names, and start/end times.
- Download editable SRT and continue to subtitle translation or AI dubbing.
Watch the Subtitle Generation Workflow
Frequently Asked Questions
What is the difference between OCR subtitle extraction and ASR?
ASR listens to the audio to transcribe speech. Video OCR reads subtitles already embedded in the picture and recovers timed cues. Choose the mode for the source you want to use; they are independent generation paths.
Can I download the generated subtitles as an SRT file?
Yes. Weydub provides editable timed SRT subtitles. Review the text, segmentation, and start/end times before using the file for publishing, translation, or dubbing.
Can I translate subtitles after generating them?
Yes. Review the source subtitle file first, then continue to subtitle translation or video localization. Correct names and missed lines at the source so they do not carry into the translated subtitles and dubbed audio.
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Is the Weydub AI subtitle generator free?
Offers a free trial; paid plans needed for batch processing/heavy use. -
Can I edit the generated subtitles?
Yes, you can use the free online editor to edit and proofread. -
Which languages does the AI subtitle generator support?
Supports over 100 languages. -
What video formats are compatible?
Supports common formats (MP4, MOV, AVI, etc.) via upload or link. -
Is there a maximum video length for subtitle generation?
Yes, the maximum video length is 15 minutes. -
Can it transcribe lyrics from background music or sound effects?
It focuses on transcribing speech, resisting noise/music interference. Not designed for lyrics or sound effects. -
My video contains multiple languages. Can subtitles be generated in more than one language at a time?
Supports 100+ languages and translation. Primarily processes one source language per video for transcription, not simultaneous multi-language detection. -
Can I generate subtitles with text-to-speech voiceover?
Yes, the platform includes AI dubbing/voiceover features to create and sync voiceovers with subtitles. -
Can I style the subtitles?
Yes. Download standard SRT files or customize font, color, and style when burning subtitles into the video on the platform. -
How to use AI to proofread subtitles?
Weydub uses AI (LLMs) to automatically calibrate during generation for accuracy. You can also manually proofread and edit using the online editor. -
How accurate is the OCR feature for subtitle extraction?
Accuracy depends on the source and generation mode. In Weydub's 10-episode short-drama comparison, Video OCR reached 98.25% character accuracy and 98.92% strict reference-cue exact recall against the editorial subtitle reference. -
Can I extract subtitles from multiple videos simultaneously?
Yes, robust batch processing allows extracting subtitles from many videos simultaneously. -
How can I extract hardcoded subtitles from a video?
Use the Weydub subtitle generator and select OCR mode to extract hardcoded subtitles from videos. -
What is the difference between captions and subtitles?
Subtitles provide dialogue text (often translation) for hearing viewers. Captions include dialogue plus important non-dialogue audio cues (sounds, speaker ID) for deaf/hard-of-hearing viewers.