Powerful online subtitle editor for text editing, millisecond timestamp adjustment, speaker management, and synchronized media preview.
Welcome to Quantum Subtitle interactive editor.
Edit text, adjust timing, and sync preview effortlessly.
Edit subtitle text, adjust timestamps with millisecond precision, reassign speakers, and sync with local media files.
Open an existing task result or drop a local subtitle and media file into the editor.
Click text to edit directly, or double-click timestamps to adjust start and end times.
Click speaker badges to switch or rename speakers, then export your refined SRT subtitles.
Recognition Options & Advanced Settings
Click any subtitle cue to edit text directly and switch or batch rename speakers across all cues.
Double-click timestamps to adjust cue boundaries with millisecond precision and error-free timing.
Distinguish different speakers and detect non-speech sound events like laughter and applause with precision.
Load local video or audio files directly in your browser for zero-upload preview with auto-scroll and speed controls.
Best for subtitle editing
Click on any subtitle row to edit the text in-place, or double-click the timestamp to adjust start and end times with millisecond precision.
Click any speaker badge to open the quick speaker selector, pick an existing speaker or add a new one. Renaming a speaker updates all associated subtitle cues automatically.
Yes. You can load a local video or audio file directly in your browser without uploading to verify subtitle timing with synchronized playback and auto-scrolling.
Yes. You can turn punctuation display on or off, and the setting applies when exporting or copying subtitle text.
Speaker recognition distinguishes and labels distinct speakers in the audio, allowing you to easily identify who spoke each subtitle cue and adjust speaker names.
Yes. Enabling audio events detects non-speech sounds like laughter and applause, which can also be filtered or edited in the subtitle viewer.
High-performance AI audio & video workflow built for creators and global teams: fast, accurate, private, and subscription-free.
Upload and process audio & video in minutes without complex software.
Accurately transcribe code-switching speech, dialects, and audio events.
All processing is strictly isolated and uploaded files are automatically wiped within 24 hours.
No expensive subscriptions. Pay only for what you use with permanent credits that never expire, plus free trial for all tools.