Fast workflow
Designed to reduce friction with direct upload, quick processing, and one-click export.
CONVERTCRAFT V3.0: THE NEXT GENERATION
Premium. Private. Pure Performance.
Experience Sub-2s processing speeds with our brand-new V3.0 engine. We've rebuilt everything to give you a Prime Experience where your files never leave your device.
WHY WE ARE DIFFERENT:
KEEP THE MISSION ALIVE: 🛡️
Running this infrastructure at this scale costs serious money. We don't sell your data, and we don't run annoying ads. We rely solely on users like you.
If ConvertCraft saved you time or kept your data safe today, help us keep it free and private for everyone.
❤️ Support Our Mission / Donate
💎 Support the Mission ($4.99/mo)☕ One-time DonationEvery dollar keeps another 1,000 users private.
CUSTOM SAAS & AUTOMATION SERVICES
Special pricing for agencies and startups. We build custom tool suites, API integrations, workflow automation and mobile app development on top of the ConvertCraft engines.
Open Video Add Audio, add your file, then choose the target output and run conversion.
This tool is optimized for video processing and works best with mp4, mov, avi, mkv, webm as inputs.
When processing completes, download the result in mp4, mov, avi, mkv, webm and verify quality before sharing.
Video Add Audio is a privacy-first utility for fast video processing. It helps you move from mp4, mov, avi, mkv, webm to mp4, mov, avi, mkv, webm with consistent output quality.
Designed to reduce friction with direct upload, quick processing, and one-click export.
Files are handled in an isolated processing flow with minimal retention and clear user controls.
Outputs are tuned for real use cases across mp4, mov, avi, mkv, webm.
A predictable sequence keeps conversion stable across devices and file sizes.
Video Add Audio accepts mp4, mov, avi, mkv, webm and exports mp4, mov, avi, mkv, webm.
The pipeline is designed for privacy-first processing with clear user control over inputs and outputs.
Use high-quality source files, choose the closest matching target format, and avoid repeated reconversion cycles.
Video Add Audio follows a deterministic conversion flow so results are repeatable and easier to troubleshoot when a file behaves unexpectedly.
Replace or mix audio tracks in a video with a new audio file.
Files processed on ConvertCraft servers, deleted immediately.
Combines a video stream with a new audio track. Replace mode removes original audio; mix mode blends both tracks.
For adding background music to silent videos, replacing poor audio from recording, or adding voiceover to footage.
See the detailed comparison guide or try a related tool: