Free subtitle tools
Convert, sync, check, merge and combine subtitle files in your browser. Free, no account, and your files never leave your device.
Every tool here runs in your browser on the same subtitle parser Aivently uses for paid jobs, so your file is never uploaded and there is nothing to install. Convert VTT, ASS, SMI or SUB files to SRT, turn an SRT into plain text, fix subtitles that are out of sync or recorded at another frame rate, check reading speed and line length before delivery, merge two SRT files, or build dual-language subtitles for language learning. When you need a file in another language, the AI subtitle translator keeps every timecode.
Runs in your browser. Your file is never uploaded.
Subtitle converter
SRT, VTT, ASS, SUB, SBV, TTML and more to SRT, VTT, ASS, TXT or JSON.
SRT to text
Strip numbers and timecodes and keep only the dialogue.
Subtitle sync
Shift every line earlier or later, or convert frame rates.
Subtitle checker
Find long lines, fast reading speed, overlaps and timing problems.
SRT merger
Join two subtitle files, one after the other or by time.
Dual subtitles
Two languages on screen at once, from two SRT files.
Sample SRT files
Valid SRT, VTT and ASS examples to copy or download.
The parsing code behind these tools is open source on GitHub.
Need this file in another language?
Aivently translates SRT, VTT and ASS files with AI, keeps every timecode, and lets you review each line before export. New accounts get 10 free minutes.