10 private browser tools
Free Online Subtitle Tools
Convert, clean, merge, and resync subtitle files directly in your browser. No uploads, accounts, or file size limits.
Runs locally
Batch friendly
No signup
Free to use
No file limits
Choose a tool
Pick the job you need. Every tool opens as a focused page and processes files on this device.
Convert formats
Move subtitle files between the formats your player or editor needs.
Fix timing and text
Repair sync problems and clean up noisy subtitle tracks.
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Shift Subtitle Timing
Move every cue earlier or later by a fixed amount.
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Subtitle FPS Converter
Rescale timing between 23.976, 24, 25, 29.97, and other frame rates.
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Two-Point Resync
Correct growing drift and framerate mismatch across the timeline.
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Subtitle Validator
Check structure, overlaps, numbering, line length, and reading speed.
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Subtitle Cleaner
Remove SDH annotations, tags, speaker labels, and overlaps.
Combine and extract
Create bilingual subtitles or turn timed captions into readable text.
Why these tools?
Most subtitle converters make you upload files to a server, sign up, or cap the file size. These tools parse and convert subtitles with JavaScript in your own browser tab — faster, private, and free.