Link → Open Captions

Online open caption
injector from any link.

Open captions stay visible no matter where the video gets re-uploaded. Drop a link, generate the captions with AI, and Pxlify injects them straight into the picture — no soft track to lose.

  • 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

Link → Open Caption Render

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...

Open caption injection for any video link

Cloud-side render. Per-speaker colours. Platform-safe MP4 output.

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.

Inject open captions in 3 steps

Paste, refine captions, render.

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.

Open caption injector FAQs

Open captions vs closed captions — what's the difference?+

Open captions are part of the video frame and always visible. Closed captions are a separate track viewers can toggle. Open captions never get stripped on re-upload.

Does the injector preserve original quality?+

Yes. We re-encode at the source bitrate or higher, so picture quality matches the original.

Can I style the captions per speaker?+

Yes. Pick a colour per speaker and the injector applies it consistently across the whole video.

Which platforms are the output MP4s safe for?+

TikTok, Reels, Shorts, YouTube, X / Twitter, LinkedIn — H.264 + AAC, browser-safe, no exotic codecs.