Are these subtitle tools really free?

Yes. Every tool on this page runs entirely in your browser, so there are no accounts, quotas, or watermarks. The full Captioner editor has a free tier too.

Are my files uploaded to a server?

No. All processing happens locally on your device with JavaScript. Files never leave your computer or phone, which also makes the tools fast and private.

Which subtitle formats are supported?

SRT (SubRip), VTT (WebVTT), and SBV (YouTube), plus plain-text transcript output. All tools are UTF-8 native and handle Chinese, Cantonese, Japanese, Korean, and other languages correctly.

What if I need transcription, translation, or burned-in captions?

That is what the full Captioner editor does: AI transcription in 100+ languages, subtitle editing against the video, translation, and styled captions rendered into the video. You can start free.

Free Tools

Convert, sync, clean up, edit, and merge subtitle files — or extract text from an image — right in your browser. No signup, no uploads, no watermarks: every tool below processes files locally on your device.

100% private: files are processed in your browser and never uploaded.

Edit

Online Subtitle Editor
Edit subtitles against your video, transcribe, translate, and burn in captions.
SRTVTTSBV
SRT Editor
Full subtitle editor in your browser: timeline, styles, undo — no signup.
SRT
VTT Editor
Edit WebVTT captions in your browser: timeline, video preview, undo — no signup.
VTT
SBV Editor
Edit YouTube .sbv captions in your browser: timeline, video preview, undo — no signup.
SBV

Fix timing

Convert

Extract

Image to Text
Extract text from images in your browser, with Fast and Accurate modes.
PNGJPGWebP

The full Captioner editor

When a quick utility is not enough: transcribe video and audio with AI in 100+ languages, edit subtitles against the video, translate them, and render styled captions into the video itself.

Try the Captioner editor — free

Frequently asked questions

Are these subtitle tools really free?: Yes. Every tool on this page runs entirely in your browser, so there are no accounts, quotas, or watermarks. The full Captioner editor has a free tier too.
Are my files uploaded to a server?: No. All processing happens locally on your device with JavaScript. Files never leave your computer or phone, which also makes the tools fast and private.
Which subtitle formats are supported?: SRT (SubRip), VTT (WebVTT), and SBV (YouTube), plus plain-text transcript output. All tools are UTF-8 native and handle Chinese, Cantonese, Japanese, Korean, and other languages correctly.
What if I need transcription, translation, or burned-in captions?: That is what the full Captioner editor does: AI transcription in 100+ languages, subtitle editing against the video, translation, and styled captions rendered into the video. You can start free.