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Free private subtitle tools

Subtitles, without the busywork.

Convert SRT and VTT, shift subtitle timing, combine files and extract readable text. Your subtitles and videos stay on your device.

Start editing ↓Sync

Source subtitles

UTF-8 text only. Maximum 5 MB per subtitle file.

Output format

Inputs stay in memory. Download your result before leaving this page.

Processed output

SRT ↔ VTT

Plain text output: styling, regions, positions and cue IDs are not preserved.

Overlaps are reported, not automatically fixed.

Local video preview (optional)

The video stays on this device. Browser codec support varies.

Cue preview

Click a cue to seek your loaded video. Preview shows the first 200 cues; downloads include all processed cues.

Your subtitle toolkit

SRT / VTT Converter — Free Subtitle ConversionConvert SRT to WebVTT or VTT to SRT locally. Validate timestamps, preview cue text and download a clean, chronologically ordered subtitle file.Subtitle Time Shifter — Delay or Advance CaptionsMove SRT or VTT captions earlier or later using a signed offset in seconds. Preview processed cues against a local video and download the result.Subtitle Merger — Combine Two SRT / VTT FilesMerge two subtitle files, optionally shift the second source and report overlaps. Download clean SRT or WebVTT with chronological cue ordering.Subtitle to Text — Clean SRT / VTT TranscriptsExtract readable transcript text from SRT or WebVTT. Remove timestamps and styling, join cue lines and optionally remove consecutive duplicate cues.

How it works

Choose a subtitle file or paste its contents into the editor. SubtitleKit validates timestamps and cue blocks before preparing an output. Use the converter for clean SRT or WebVTT files, the timing tool for a constant delay correction, the merger for two sources, or the transcript tool for readable text. A local video can help you preview cue timing. Nothing is uploaded, and no account is needed. Inputs are kept in page memory, so download the result before navigating away. The original file is not overwritten.

Frequently asked questions

Are subtitles or videos uploaded?

No. Parsing, processing and local video playback happen in your browser. Only the theme preference is stored; source text is lost when you leave the page.

Will formatting and positioning survive?

Output uses plain visible cue text. Styling, regions, cue IDs, positions and metadata are not retained. Keep your original files.

Which files are supported?

UTF-8 SRT and WebVTT, up to 5 MB and 50,000 cues per input. Convert legacy encodings first. Video preview depends on your browser’s codecs.