Bounded-memory stream extraction
Extract embedded video and audio from giant PDFs
Scan locally in fixed 5 MB chunks, isolate recognized media streams into browser storage, and save them without loading the complete PDF into memory.
Drop a multimedia PDF to start a 5 MB streaming scan.
Extracted local media
Temporary files live in browser OPFS until you save or clear them.
Detected MP4, WebM, MP3, WAV, OGG and FLAC streams will appear here while the scan is still running.
Accuracy boundary: extraction requires a direct PDF /Length and a recognizable media signature or embedded-media dictionary. Indirect lengths, encrypted PDFs, fragmented proprietary RichMedia packages and unsupported filter chains are reported as non-extractable rather than guessed. Browser garbage collection cannot be forced; bounded chunks and OPFS streaming make old buffers eligible for automatic collection.
User guide
How to use PDF Multimedia Inspector
Stream-scan large PDFs for multimedia-related object markers without loading the whole file at once.
- 1
Choose a large PDF.
- 2
Start the chunked scanner and monitor byte progress.
- 3
Review candidate audio, video, attachment, and filter markers.
- 4
Export only verified streams in supported formats.
Best for
- Inspecting PDF attachments
- Finding multimedia object candidates
Important limitation
Marker scanning alone cannot safely reconstruct every PDF stream; object streams, compression, encryption, and cross-chunk boundaries require a full parser. File size and speed are not unlimited.
Frequently asked questions
Can every embedded video be extracted?
No. Support depends on how the media is embedded and encoded.
Is WebCodecs a PDF parser?
No. WebCodecs decodes known media chunks after correct PDF extraction.
PDFPerch processes files locally unless this guide explicitly identifies a cloud-dependent feature. Always keep an original copy and verify critical output before submission, printing, signing, or accounting use.