File Formats
Reference pages for the audio and video formats you encounter when converting online video. Each page explains what the format actually is, how it compares to alternatives, file sizes, and when to choose it.
MP3
Lossy audio — the universal compatibility choice. Bitrates, ID3 tags, CBR vs VBR.
MP4
The most common video container. H.264 vs H.265 vs AV1, file sizes, compatibility.
AAC
YouTube and iPhone's native audio format. How it compares to MP3 at each bitrate.
WAV
Lossless uncompressed audio — for recording, editing, and professional delivery.
WebM
Open, royalty-free container with VP9/AV1 video and Opus audio. Why YouTube uses it.