MurmurSubtitles

Drag in a video and get word - by - word, precisely timed subtitles in minutes. MurmurSubtitles does transcription, translation, styling, and export right on your Mac - none of your data ever leaves your device.

■ Word - by - word, precisely timed transcription
• Two - stage on - device AI - speech recognition plus forced aligner for every word to know exactly when it was spoken
• Intelligent segmentation - audio is split at silences, never cutting words
• Natural - flowing subtitles - subtitle bars break at sentence boundaries and are sized for comfortable reading
• Precision at your choice - fast, balanced, or best, with the app automatically matching the right model

■ A truly professional subtitle editor
• Professional quality checks - reading speed (CPS, characters per second), line length (CPL, characters per line), duration, spacing, and overlap
• Easy - to - understand check results - each check explains why it matters and offers a one - click fix
• Waveform - fine - tuned timeline - drag subtitle bar edges against the real audio
• Sense of shot changes - subtitle bar edges automatically avoid video cut points
• Word - by - word split and merge, overall pan calibration, deep undo and redo

■ Bilingual by nature
• Queue up the target language and get a perfectly aligned translation track
• Translations always stay in sync - regenerate with one click after editing
• All translations are done on - device

■ Beautiful subtitle styles
• Presets plus full customization - font, size, per - line color, background, position
• Karaoke word - by - word highlighting - the word being spoken lights up
• Gradient - masked background - big - text subtitles, YouTube - lyrics - like visual effects
• Learner presets - large serif fonts designed for language learning

■ Every export you need
• SRT and VTT external subtitle files
•.ass styled export with your fonts and colors
• Burn - in export - burn subtitles into a brand - new 1080p or 4K video and post directly to social platforms

■ Privacy first
• 100% on - device operation - your videos, audio, and text never leave your Mac
• AI models are downloaded only once on first launch, no network needed after that
• No account required, no tracking of your media content, no cloud round - trips

For content creators, language learners, educators, and video teams who don't want to upload their footage to someone else's servers - this is the tool for you.

Give every video subtitles that meet professional standards - and your videos never leave your desktop.