Sync Subtitles Online — Shift SRT/VTT Timing, 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.

Online Subtitle Editor

Edit subtitles against your video, transcribe, translate, and burn in captions.

Subtitle Converter

Convert between SRT, VTT, SBV, and plain text in your browser.

VTT to SRT Converter

Turn WebVTT captions into SubRip .srt files instantly.

SRT to VTT Converter

Turn SubRip .srt files into web-ready WebVTT captions.

SRT to Text

Strip timestamps and numbering to get a clean transcript.

Image to Text

Extract text from images in your browser, with Fast and Accurate modes.

Sync Subtitles

Shift every subtitle earlier or later with millisecond precision.

SRT Editor

Edit subtitle text and timing in a simple table, no signup.

Merge SRT Files

Combine two SRT files into one, renumbered and retimed.

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

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.