Convert, Edit, Optimize
Subtitles - All in one place
110+ subtitle tools. Convert, edit, sync, translate and export subtitles across 11+ formats - all in your browser. No upload, no limits.
AllSubConverter is a privacy-first subtitle processing workspace for converting, editing, syncing, translating, cleaning, and optimizing subtitle files. Process your subtitles directly in your browser - no uploads and no server-side processing.
Drag & drop your subtitle file here
or click to browse
Powerful Workflow, Simplified
Upload once, then chain the tools you need - your file carries through every step.
Why Local First?
Your subtitles are processed directly in your browser. Your files stay on your device.
Private by Default
Your files never leave your device.
No Uploads
No server upload. No waiting for files to transfer.
Fast Processing
Use your device computing power for instant processing.
Works Offline
Many tools continue to work without an internet connection.
Everything You Need to Work with Subtitles
40+ format converters and 30+ editing, sync, QA and AI tools - all in one place.
Convert
40+ subtitle formats
SRT | VTT | ASS | SSA | LRC | TTML | SCC | STL...
Explore convertersEdit & Clean
Edit, clean, normalize, and repair subtitle content.
Explore edit toolsSync & Timing
Shift, retime, resync, adjust speed and frame rate.
Explore sync toolsAI Tools
Translate, rewrite, annotate, and enhance subtitles.
Explore AI toolsQA & Analysis
Check quality, reading speed, timing, overlaps, and consistency.
Explore QA toolsPopular Subtitle Tools
Jump straight into the tools people use most.
One Workspace for Every Subtitle Workflow
Whether you are converting a subtitle format, fixing timing, cleaning up transcripts, or preparing subtitles for publication, AllSubConverter brings the tools you need into one privacy-first workspace.
Convert Subtitle Formats
Convert SRT, VTT, ASS, SSA, LRC, TTML and more in a single click.
Fix Subtitle Timing
Shift timestamps, adjust speed, convert frame rates, and synchronize subtitles.
Clean & Optimize
Remove duplicates, fix spacing, balance subtitle lines, and improve readability.
Translate & Enhance
Translate subtitles, rewrite dialogue, add annotations, and prepare multilingual content.
AI Tools That Save You Time
Bring your own API key. AI requests are sent directly from your browser - no middleman.
Supported formats
All popular subtitle formats supported
Your Subtitle Workspace, All in One Place
Convert, edit, clean, sync, translate, and export - without jumping between different tools.
- Multiple files in one workspace
- Local-first processing
- Workflow-based tools
- Real-time preview
Files
Info
Original Subtitle
Timeline Preview
Current Tool
Output Format
Recommended workflow
Frequently Asked Questions
Everything you need to know about working with subtitles in AllSubConverter.
What is AllSubConverter?
AllSubConverter is a privacy-first subtitle processing workspace. It bundles 110+ tools for converting, editing, syncing, translating, cleaning, and exporting subtitle files - all running directly in your browser.
Do my subtitles get uploaded to a server?
No. Every tool processes your files locally in your browser. Your subtitles never leave your device, which keeps them private and makes processing instant.
Which subtitle formats are supported?
AllSubConverter supports SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI and TXT. You can convert between any of them in a single step.
How do the AI tools work?
The AI Translator, Rewriter, and Annotator run from your browser. You bring your own API key, and requests are sent directly to the model provider - AllSubConverter never proxies or stores your key or content.
Is AllSubConverter free to use?
Yes. Every converter and editing tool is free with no file size limits, no daily caps, and no sign-up required. AI tools only need your own API key.
Can I process multiple files at once?
Yes. The workspace handles multiple files at once, and the batch converter can process a whole folder in a single run.