Local · Private · GPU-fast

Convert anything. Instantly.

Drop in any video or audio file, pick a format, convert. FFmpeg does the heavy lifting on your own CPU and GPU — so nothing is ever uploaded, and speed is limited only by your machine.

Download for Windows See how it works

No uploads, ever No accounts No file-size limits MIT-licensed & free forever

Why FastConvert

Built like local software
should feel.

No queues, no watermarks, no 2 GB ceiling. Just native FFmpeg wired to a interface that gets out of the way.

100% local. Nothing leaves your machine.

Files stream straight from disk into FFmpeg child processes. No servers, no telemetry, no accounts. Your media never touches the network — which also means no upload wait and no privacy trade.

GPU acceleration, automatic.

Auto-detects NVIDIA NVENC, Intel Quick Sync and AMD AMF, then falls back to tuned CPU encoders.

NVENC Quick Sync AMF CPU x264/x265

Instant remux.

Stream-copy compatible tracks into a new container with no re-encode. MKV → MP4 in a blink.

Copy mode

Unlimited batch queue.

Drop a whole folder. Every file runs concurrently with live progress, speed and ETA.

Per-file progress

Large-file friendly.

Streams from disk instead of loading media into RAM. A 4-hour 4K master is no problem.

Never loads to RAM

0

Files uploaded to a server. Ever. Conversion happens entirely on-device.

Free forever

No tiers, no paywalled batch mode, no “pro” upsell. Open source under the MIT license — for everyone, with no limits.

How it works

Three steps. That's the whole app.

Drop your files

Drag video or audio anywhere in the window, or press Ctrl+O to browse. Any size, any format FFmpeg reads.

Pick a format

Choose an output container or codec and a quality preset. Leave the encoder on Auto and it picks your fastest hardware path.

Convert

Hit Convert. Watch live per-file progress, encoding speed and ETA. Cancel any job instantly — the child process dies with it.

The difference

Why not just use an
online converter?

	FastConvert	Typical online converter
File-size limits	None	100 MB – 2 GB
Privacy	100% local, nothing uploaded	Files uploaded to a server
Speed	Native FFmpeg + GPU encoding	Shared server queue
Batch conversion	Unlimited files	Usually paid-only
Cost	Free forever, MIT	Ads, limits or subscription

Format support

Anything in. Almost anything out.

If FFmpeg can read it, FastConvert can take it. These are the output targets you can pick.

View the full supported format guide

Video containers14

MP4MKVMOVWebMAVIFLVMPEG-TSM4VWMV3GPMPEGOGVProResGIF

Video codecs7

H.264H.265 / HEVCAV1VP9TheoraProResWMV2

Audio7

MP3AACM4AWAVFLACOGGOpus

Windows 10 / 11 · 64-bit

Get FastConvert.
It's free, forever.

One download. No installer bloat, no sign-up, no catch. Bring your own FFmpeg or grab the bundled build.

Download the installer

Open source · MIT No account required v1.2.0

Button clicks —

GitHub downloads —

GitHub downloads are release-asset downloads, not unique people.

Questions

Good to know.

Is it really free?

Yes — free for everyone, forever, with no limits. FastConvert is open source under the MIT license. There is no paid tier, no locked batch mode, and no upsell. The only separately-licensed piece is FFmpeg itself, which does the actual media work.

Do my files get uploaded anywhere?

Never. Everything runs on your own computer as native FFmpeg child processes. There are no servers, no accounts and no telemetry. Your media never touches the network.

What do I need to run it?

Windows 10 or 11 (64-bit). The bundled installer includes a slim FFmpeg build, or you can point FastConvert at your own ffmpeg.exe and ffprobe.exe. GPU acceleration is used automatically when a supported NVIDIA, Intel or AMD encoder is present, with a CPU fallback otherwise.

What formats can it handle?

Any input FFmpeg accepts. Output targets include MP4, MKV, MOV, WebM, AVI, FLV, MPEG-TS, WMV, ProRes, GIF and more for video, plus MP3, AAC, M4A, WAV, FLAC, OGG and Opus for audio. The format guide groups the currently advertised targets by type.

Is there a Mac or Linux build?

Today FastConvert ships for Windows. The core is Electron plus FFmpeg, so other platforms are technically feasible — but only Windows builds are packaged and tested right now.

How is it so fast?

Two reasons. When the source and target codecs are compatible, it stream-copies (remuxes) with no re-encode — near-instant. When a real transcode is needed, it uses your GPU's hardware encoder. Either way, there's no upload and no server queue in the middle.