Technical media and creator utilities

Inspect local media properties and make timecode, frame, chapter and waveform calculations.

Media inspection is bounded and may use sampled frames or browser metadata rather than a full demux of every stream. Treat estimates and threshold detection as approximate.

Inspect Media Basics →

Read browser-visible duration, size and dimensions from a local media file.

Video Bitrate & Size Calculator →

Estimate bitrate needed for a duration and target upload size.

Frame & Timecode Calculator →

Convert non-drop-frame timecode to frame number and elapsed seconds.

Manual Chapter Marker Creator →

Write video chapter markers and export an FFmetadata text file.

Video Contact Sheet Creator →

Create a local PNG contact sheet from up to nine sampled video frames.

Scene Change Candidate Detector →

Sample video frames locally and flag large luminance changes.

Black Frame Candidate Detector →

Sample video frames to flag nearly-black intervals.

Audio Peak & RMS Inspector →

Calculate sampled per-channel peak and RMS readings for local audio.

Practical starting points

Start with a short known-good sample, choose a supported output, and verify playback before sharing. Files are processed on your device in the current release; unsupported operations do not silently upload.

How browser processing works · Formats and limits · Every published tool