Free subtitle tools for SRT and VTT files.
Convert, synchronize, and check the subtitle file you already have. Each utility runs in your browser, requires no account, and keeps the pasted caption text on your device.
SRT to VTT converter
Convert SubRip timestamps and cue text into a clean WebVTT file for browser-based video players. Preview the result and download the .vtt file locally.
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VTT to SRT converter
Turn a WebVTT caption file into numbered SubRip cues for editors and platforms that expect .srt. Advanced VTT-only styling is clearly left out.
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Subtitle timing shifter
Move every SRT or VTT cue earlier or later by one precise offset while preserving its duration. Review how cues crossing zero are handled.
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Caption length checker
Measure each cue in characters per second and find captions that may move too quickly for comfortable reading before publishing.
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SRT merger
Join subtitles for two consecutive clips, choose the transition gap, and download one renumbered SRT without recalculating every timestamp.
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Caption word counter
Count visible words, characters, cues, and display time in an SRT or VTT file while excluding timestamps and cue identifiers.
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Choose the fix that matches the problem
Convert a subtitle file without retranscribing
SRT and VTT are both timed-text formats, so changing between them should not require uploading the source video or generating the words again. Use the two converters when the captions are correct but the destination asks for a different extension. The output is deliberately basic and portable: timestamps and visible text are kept, while format-specific styling or region instructions need manual review.
Fix a constant synchronization delay
Choose the subtitle timing shifter when every caption appears the same amount too early or too late. Enter a positive offset to delay cues or a negative offset to bring them forward. Check both the beginning and end of the video first. If the timing error grows during playback, the file has drift and needs range retiming rather than one global shift.
Review reading speed before publishing
The caption length checker calculates characters per second for every timed cue. It is useful for locating crowded captions, especially those with a lot of text and very little screen time. A threshold is only a review aid: line breaks, language, audience, accuracy, contrast, and placement still need a human preview in the final player or video.
Generate captions when no subtitle file exists
These utilities repair existing timed text; they do not listen to audio. If you only have a video, use the AI subtitle generator to transcribe the speech, correct the words, style the captions, and export a finished video or separate subtitle file. Return here later when another platform requires a different file format or a simple timing adjustment.
Subtitle tool questions
Are these subtitle tools free?
Yes. These file utilities can be used without an account. They run locally in the browser and create the converted, merged, measured, or corrected result from the subtitle text you paste.
Do I need to upload my video?
No. Conversion, timing shifts, and reading-speed checks only need an SRT or VTT file. A source video is useful for manually checking synchronization, but it is not uploaded to these tools.
What is the difference between SRT and VTT?
Both store timed caption cues in text. SRT commonly uses numbered cues and comma milliseconds. VTT begins with a WEBVTT header, uses period milliseconds, and can support additional web-player settings.
Can these tools create subtitles from audio?
No. They work with existing timed subtitle text. Use the AI subtitle generator when you need to transcribe speech from a video before editing or exporting captions.