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About Style Editor
Style Editor — free, private, browser-based subtitle tool
Add bold, italic, or color tags to every cue at once. It runs in your browser, so the file is processed on your own device.
Why use Style Editor
- ·Files stay on your device — nothing is uploaded
- ·No signup needed
- ·Works in any modern browser, on any OS
- ·Free daily use; Pro removes limits and watermarks
How to use it
- 1Type or paste your input.
- 2Pick the options you want.
- 3Copy or save the result.
What Style Editor does
Add bold, italic, or color tags to every cue at once.
How it works
Whisper via transformers.js with quantized models that fit the on-device budget; ffmpeg.wasm for burn-in. The processing code runs inside the page, so your file is not uploaded to a server — you can confirm this in your browser's DevTools → Network tab.
Frequently asked questions
Does Style Editor upload my files?+
No. Style Editor runs in your browser and processes the file on your device. Nothing is sent to our servers.
Is Style Editor free?+
Yes, with a daily free allowance and no signup. Xonvert Pro ($4.99/month) removes the daily limits and the watermark on exported files.
Do I need to install anything?+
No. It works in any modern browser on Windows, macOS, Linux, ChromeOS, Android and iPad.
Related subtitle tools
Character Counter
Count characters per line and per second — flag cues that read too fast.
Clean & Normalize
Strip music notes, normalize quotes, fix common subtitle clutter.
FPS Converter
Re-time subtitles when the video frame rate changes — 23.976 ↔ 25, etc.
Merge
Combine two subtitle files end-to-end with optional offset.
Split at Time
Cut a subtitle file in two at a chosen timestamp.
Sync Fixer
Align subtitle timings — shift, stretch, or anchor on two known points.