Timeline Sync

Automated subtitle
timeline synchronization.

Drop in a video and a desynced subtitle file and Pxlify re-aligns every cue to actual speech onsets. The output is a tight, frame-accurate sub track you can ship.

  • Free up to 60 min
  • ·
  • 100% word accuracy
  • ·
  • Speaker labels included
  • ·
  • 99+ languages
  • ·
Audio / Video File

Drag & Drop

MP3, MP4, M4A, MOV, AAC, WAV, OGG, OPUS, MPEG, WMA, WMV

— OR —
Or see interactive demo below
Free tier — no signup to try Speaker diarization included SRT, VTT, ASS, JSON, TXT, DOCX exports
Word accuracy100%State-of-the-art ASR benchmark
Free transcript pool60 minNo credit card · cancel anytime
Languages supported99+Auto-detect + manual select

Timeline Sync Pipeline

Watch the exact pipeline that runs when you upload media to Pxlify.

pxlify_ai_engine_processor
Active Simulation
1

Upload & Extract

explainer_video.mp4

2

Whisper Speech AI

Converting audio to words...

3

Studio Transcripts

Synced SRT & VTT Exports

explainer_video.mp4

0%

Extracting high fidelity audio streams...

Subtitle timeline sync, automated

Re-align cues to actual speech. Handle drift. Re-export clean.

Timed Highlights

Aligns audio signals with precise segment timestamps, ensuring transcripts fit video timelines perfectly.

Whisper Speech Model

Leverages neural transcription frameworks to capture speech patterns, technical terms, and complex vocabulary.

Multi-Format Exports

Export to SRT, WebVTT, Advanced SSA (.ass), JSON, Word (.docx), or a clean speaker-script TXT — ready for YouTube, Netflix-style subbing pipelines, and short-form video editors alike.

Interactive Playback

Click any word or timestamp in the transcript to jump the video directly to that spoken segment.

Privacy Secured

Local preprocessing allows you to play and test files locally in the browser sandbox before uploads are triggered.

Inline Studio Editor

Refine and update text segments directly on the dashboard with instantaneous state synchronization.

Sync a subtitle timeline in 3 steps

Upload video + sub, run sync, export.

01

Upload your video

Drag in a local file (.mp4, .webm, .mov) or pick an existing recording from your library.

02

Auto-generate timestamps

Pxlify analyzes the audio, splits it into speech segments, and timestamps every line automatically.

03

Refine & export

Search segments, edit lines inline, sync playback timings, then export to SRT, VTT, ASS, JSON, DOCX, or speaker-script TXT.

Timeline sync FAQs

Can the tool fix constant offset and drift in one pass?+

Yes. The aligner handles fixed offsets and gradual drift in the same pass.

Which subtitle formats can be re-synced?+

SRT, VTT, and ASS in, same formats back out.

Will speaker tags survive the sync?+

Yes. Speaker tags, line breaks, and formatting are preserved during re-alignment.

Do I need an existing transcript?+

No. If you don't have one, Pxlify can generate a fresh diarized transcript instead of syncing.