Free caption generator
Generate timestamped captions (SRT/TXT) from video or audio — free, fast, and export-ready.
Built for teams that want transcripts to turn into reusable, searchable assets.
Free Caption Generator
Generate timestamped captions from your audio or video in minutes. Upload a file, click “Start transcription,” and download captions as TXT or SRT on the free tier. This free caption generator works with common formats like MP4, MP3, WAV, and WEBM, supports automatic language detection, and gives you a Speed vs Quality choice before processing. It is genuinely usable without paying, though longer files, advanced export formats, and features like speaker labeling are part of paid workflows.
What you can do right now with this free caption generator
This tool is built for fast, practical captioning without setup. You upload a file, confirm settings, and generate captions that you can copy or download immediately. For creators who need quick turnaround, this removes the usual friction of installing software or learning an editing timeline.
You can use it for short-form clips, podcast snippets, lectures, or rough drafts of longer videos. The free flow is designed to be useful on its own, especially if your goal is to get a clean SRT file that you can refine later. If you want deeper editing, team workflows, or more export formats, those sit behind the upgrade path rather than blocking the initial use.
Common use cases include:
- Create SRT captions for a YouTube upload
- Add captions to an Instagram or TikTok clip
- Generate subtitles for a recorded lecture
- Produce quick captions for a podcast preview
How to use it (3-step flow)
The interface follows a simple upload-then-confirm pattern. You do not need to configure anything advanced unless you want to tweak speed or accuracy.
- Upload your audio or video file
- Confirm settings like language detection and speed vs quality
- Click “Start transcription” and wait for processing to complete
After processing, you can preview the transcript and download it as TXT or SRT. The SRT file includes timestamps, so it works directly with most video platforms and editors.
If you want a broader overview of transcription workflows, the guide on shows how captions fit into content pipelines beyond subtitles.
Supported inputs and outputs
This free caption generator accepts a wide range of standard media formats. You can upload both audio and video files without converting them first, which saves time when working across different tools or devices.
Supported input formats include:
- AAC
- FLAC
- M4A
- MP3
- MP4
These items work together. Get the basics right and the rest is easier.
- MPEG
- MPGA
- OGG
- WAV
- WEBM
On the output side, the free tier focuses on the formats most people need immediately. TXT works for quick copy and editing, while SRT is the standard subtitle format used by YouTube, video players, and editing software.
Free exports:
- TXT (plain transcript)
- SRT (timestamped captions)
Paid plans create additional export formats like VTT, DOCX, and JSON. You can see how those fit into larger workflows on the or compare tiers directly on .
How it works (engines and routing)
Under the hood, the free caption generator uses self-hosted, Whisper-based speech recognition models routed through a processing bridge. This includes faster-whisper and, in some cases, NVIDIA ParaKeet models depending on availability and workload.
This setup allows the free tier to remain accessible while still delivering solid transcription quality. You can choose between speed and accuracy modes, which affects how the model processes your file. Faster modes are useful for drafts, while higher-quality modes aim for better transcription on clear audio.
Language detection supports over 100 languages automatically. You do not need to manually set the language in most cases, though you can confirm it before starting the transcription.
Accuracy is generally strong for clear recordings, but it is not perfect. Background noise, overlapping speech, and strong accents can reduce quality, so some manual editing is usually required.
Where the free workflow usually breaks
The free caption generator is intentionally useful, but it is not designed to handle every production scenario. Most limitations appear when you move from quick captions to repeat workflows or longer content.
Common constraints you may notice:
- Longer files may take more time to process
- Accuracy drops with noisy or low-quality audio
- No speaker labeling on the free tier
- Only TXT and SRT exports are available
- No batch uploads or parallel processing
- Editing is basic compared to full production tools
These limits are not hidden behind a paywall after upload. You can see them upfront and decide whether the free flow fits your needs before committing time.
If you regularly work with captions, these constraints usually show up quickly. That is where upgrading becomes a practical next step rather than a forced upsell.
When it makes sense to upgrade
Upgrading is less about removing restrictions and more about enabling smoother workflows. If you only need occasional captions, the free tool is often enough. If you produce content consistently, the paid features start to matter.
You might consider upgrading when:
- You need VTT, DOCX, or JSON exports
- You want speaker identification in transcripts
- You process longer or more frequent files
- You need more consistent accuracy across varied audio
- You want team or collaborative workflows
Paid plans use ElevenLabs Scribe models for transcription, which include native speaker diarization and improved handling of complex audio. This is especially useful for podcasts, interviews, and meetings.
You can explore the differences in detail on the or review capabilities on the . If you want to try another free entry point, the uses the same core flow.
Examples: how creators use this tool
Creators tend to use caption generators in short, repeatable workflows. The goal is rarely perfect captions on the first pass. Instead, it is about getting a strong draft quickly and refining only what matters.
For a YouTube video, you can upload your final edit, generate an SRT file, and upload it directly for subtitles. This improves accessibility and can help with discoverability.
For Instagram or TikTok, you might generate captions for a short clip, then paste or adapt them into on-screen text. Even a rough transcript saves time compared to typing from scratch.
Students and educators often upload recorded lectures to generate notes. The TXT export is useful for studying, while SRT works if the lecture is shared as video.
Podcast creators commonly generate captions for teaser clips or social posts. This helps reach viewers who watch without sound and makes content easier to skim.
FAQ
How accurate is the free caption generator?
Accuracy is generally strong for clear audio with minimal background noise. It can handle many accents and languages, but results vary depending on recording quality. Expect to make light edits, especially for names, technical terms, or overlapping speech.
Does it support multiple languages?
Yes, the tool includes automatic language detection for over 100 languages. In most cases, you can upload your file and let the system detect the language without manual input.
Can I export captions in VTT or other formats?
Not on the free tier. Free exports are limited to TXT and SRT. Formats like VTT, DOCX, and JSON are available on paid plans, which you can review on the .
Does the free version include speaker diarization?
No, speaker identification is not part of the free tier. It is available on paid plans that use ElevenLabs Scribe models, which are better suited for multi-speaker audio.
Are there limits on file size or length?
The free tier is designed for short to moderate files. Longer uploads may take more time or hit practical limits. If you regularly process long recordings, upgrading provides a more reliable workflow.
Is my data private?
Files are processed for transcription and are not described as public or shared. For sensitive content or compliance needs, reviewing the and plan details is recommended before uploading.
Do I need to install anything?
No installation is required. The tool runs in your browser, so you can upload files and generate captions directly online.
Start generating captions now
Upload your file and get usable captions in minutes. No setup, no hidden steps—just upload, confirm, and download.
Start transcribing: /tools/free-audio-to-text
Create advanced workflows: /pricing