Drop a WebM file. AI transcribes the audio with word-level timestamps. Edit captions. Download your SRT. Video stays in the browser.
Drop a WebM file and get an SRT subtitle file in minutes. No software to install. Video stays in your browser. Learn more about the
MP4, WebM, MOV · up to 10 min
WebM is an open, royalty-free video container format developed by Google. It uses VP8 or VP9 video codecs and Opus or Vorbis audio codecs, wrapped in a Matroska-based container. Because Google backs the format and Chrome has native WebM support, any tool that records inside a Chromium-based browser typically produces a WebM file.
You encounter WebM files from several common sources: Chrome and Edge screen recordings, Google Meet exported meeting recordings, Chromebook webcam captures, OBS Studio recordings, and browser-based recording tools like Loom and Screencastify. The format is lightweight and well-suited for web playback, but these recordings rarely come with subtitles.
SnapSubtitles handles WebM natively. Drop your file into the editor, and the browser reads it locally. Audio is extracted and sent to AI transcription, which returns word-level timestamps for every spoken word. Since the tool processes video without uploading it, the screen content in your recordings never leaves your device.
SRT Format Structure
Four steps. Drop a WebM file, get an SRT subtitle file with millisecond-precision timestamps. The same workflow handles MP4 and MOV files too.
No software to download or install. Open SnapSubtitles in Chrome, Edge, Firefox, or Safari. The editor runs entirely in your browser with nothing to configure.
Drag your WebM file into the editor. The browser reads it locally and extracts the audio track. Only compressed audio goes to AI transcription. Video frames, including all screen content, stay on your device.
AI returns word-by-word timestamped captions. Edit any word directly. Split at any word boundary with automatic timing. Merge adjacent blocks. Adjust start and end times with millisecond precision.
Download a standard SRT file with HH:MM:SS,mmm timestamps. VTT is also available. Both on Pro/Max plans. Free plan exports a 720p captioned MP4 with watermark.
Free plan includes 60 min/month transcription. SRT download on Pro/Max.
WebM is the default output for browser-based recording. These recordings almost never come with subtitles, yet they contain spoken content that benefits from a text layer.
Software tutorials, product walkthroughs, and internal demo videos are often recorded as WebM in Chrome-based tools. Subtitles make them searchable by text, accessible to deaf and hard-of-hearing viewers, and usable in noisy environments.
Google Meet exports recordings in WebM format. Meeting recordings contain important discussions, decisions, and action items that are easier to reference with a text transcript. An SRT file turns a lengthy recording into a scannable document.
Schools using Chromebooks produce WebM files from built-in recording tools. Student presentations, teacher instructions, and classroom recordings benefit from subtitles for accessibility compliance and review.
Loom, Screencastify, and other browser-based tools produce WebM files used for async communication, onboarding, and documentation. Subtitles improve comprehension, especially for international teams.
Screen recordings often capture dashboards, code reviews, customer data, or financial reports. These files need subtitles for review and archival, but uploading the full video to a third-party service creates a privacy risk.
Two ways to add subtitles to your WebM recording. SnapSubtitles supports both from the same editing session.
Both outputs use the same AI transcription and millisecond-precision editing. The choice depends on where the video will be published. Upload to YouTube Studio? Download the SRT. Sharing on a platform that does not support subtitle files? Export the captioned MP4. You can edit timing with millisecond precision before either export.
Screen recordings frequently contain sensitive material: internal dashboards, proprietary source code, customer data, financial reports. Most online subtitle generators require uploading the full video. SnapSubtitles sends only the audio.
This architecture is relevant for teams operating under SOC 2, HIPAA, GDPR, or other compliance frameworks where transmission of visual data is regulated. Learn more about how the video stays in the browser throughout the entire workflow.
When you drop a WebM file into SnapSubtitles, the browser reads it locally. The file sits in browser memory, accessible only to the editor running on your machine. No upload starts.
The browser separates the audio track from the video container. Only the compressed audio, stripped of all video data, is sent to the AI transcription service. Screen content is never transmitted.
The transcription service processes the audio and returns word-level timestamps. The audio is not permanently stored. Your SRT file is built entirely from these returned timestamps and recognized text.
If you choose to export a captioned MP4 instead of an SRT file, the rendering happens in your browser using WebCodecs. The final video is assembled on your machine, not on a remote server.
Common questions about converting WebM videos to SRT subtitle files.
Drop a WebM file and get an SRT subtitle file in minutes. No software to install. Video stays in your browser. Learn more about the
