Subtitle tools — 11 free, in your browser
Subtitle and caption tools — auto-transcribe, sync, translate, style, and burn-in captions, all on-device.
Most popular
All 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.
Style Editor
Add bold, italic, or color tags to every cue at once.
Sync Fixer
Align subtitle timings — shift, stretch, or anchor on two known points.
Timing Shifter
Shift every cue forward or backward by a fixed amount.
Subtitle → Text
Pull the dialogue out of a subtitle file — pure text, no timestamps.
Translator Prep
Extract just the lines so you can paste into any translator and merge back.
What people do with the subtitle tools
- ·Auto-transcribe video and audio to SRT, VTT, ASS
- ·Sync caption timing with frame-accurate offsets
- ·Translate captions across languages on-device
- ·Style captions with fonts, colors, shadows
- ·Burn captions permanently into video via ffmpeg.wasm
Why Xonvert Subtitle
Compared with Aegisub (desktop), Subtitle Edit, Xonvert's subtitle tools trade install, license, and account for a URL. Free, private, fast, and offline-capable once loaded. The depth a desktop tool offers, with none of the friction.
Frequently asked questions
Are the Xonvert Subtitle tools free?+
Yes — every tool is free. No signup, no credit card, no trial limits. Pro removes the small export watermark on free tools and lifts daily quotas on the heaviest operations.
Do my files leave my device?+
No. The Subtitle tools run entirely in your browser. Your files are processed locally and never reach our servers.
Do they work offline?+
Yes — once a tool page is loaded, the browser caches its code and the tool keeps working without internet.
Do they work on mobile?+
Yes. Every subtitle tool works in modern mobile browsers on Android and iOS without an app install.
Can I use these for commercial work?+
Yes, with no licensing fees. We don't claim rights to anything you produce.