WEBM vs MP4 for demo videos
For demo videos on the web, WEBM is almost always enough: YouTube, Product Hunt, X, LinkedIn, Discord and every modern browser accept it directly. MP4 still matters for older desktop editors, some presentation software and iOS-native workflows. ReelCap exports WEBM — upload it as-is, and convert it once in the rare case something insists on MP4.
Doing it without an extension
- 1Check whether your destination actually needs MP4 — most upload forms take WEBM without complaint.
- 2If it does, install ffmpeg, or use any local converter you already trust.
- 3Run a single conversion command over the recording, keeping the original as your master.
- 4Upload the converted file, and keep the WEBM for future re-exports.
Where that falls short
- Every re-encode costs a little quality, so converting more than once compounds the loss.
- Online converters mean uploading your recording to a stranger's server — the opposite of recording locally.
- MP4 files of the same visual quality are usually larger than the WEBM you started with.
Doing it with ReelCap
- 1Record in ReelCap and download the WEBM file.
- 2Upload it directly wherever you're publishing — YouTube, Product Hunt and social platforms accept it as-is.
- 3Only if a tool refuses WEBM, convert once locally with ffmpeg: ffmpeg -i demo.webm -c:v libx264 -crf 20 -c:a aac demo.mp4
- 4Keep the WEBM as the master, so future conversions start from the original quality.
Every step happens in your browser. Nothing is uploaded, and the export carries no watermark.