Fast, private HEVC → MP4 converter in your browser
Convert H.265/HEVC videos to widely compatible MP4 (H.264/AAC) with no uploads. Everything runs locally using FFmpeg.wasm. Batch convert, tweak quality, and download instantly.
Tip: Large files need free space and RAM. For best speed, use desktop Chrome/Edge.
Drop HEVC videos here or click to browse
.mp4, .mov, .mkv and more are supported. We'll detect HEVC automatically.
Output settings
*Multi-threaded core loads where supported. First run downloads the FFmpeg WebAssembly core (~25–30 MB) and caches it for offline use.
Results
How it works
- 1. Add your videos (drag & drop or pick files). We auto‑detect codecs.
- 2. Choose quality, speed, resolution, and audio options. CRF 23 is a good default.
- 3. Click Convert. Processing stays on your device. Download MP4s when ready.
FAQ
Does this upload my videos?
No. The converter runs in your browser using WebAssembly (FFmpeg.wasm). Your files never leave your device.
What files are supported?
Most common containers: MP4, MOV, MKV, etc. We target MP4 (H.264 + AAC) output for broad compatibility.
Why is the first conversion slow?
The FFmpeg core (~25–30 MB) is downloaded and cached on first use. Later conversions are much faster.
Privacy
We do not collect, store, or transmit your videos. All processing happens locally in your browser. If you enable the optional offline cache, core files are stored by your browser for faster use.
By using this tool, you agree that performance depends on your device and browser. For best results, use a modern desktop browser.