Convert anything, skip the re-encode when you can.
MP4, MKV, MOV, AVI, WMV, FLV, WEBM for video · MP3, WAV, FLAC, M4A, OGG for audio.
GPU acceleration (NVENC / QSV / AMF) picks itself automatically, and when
a file already matches your target format, Convert remuxes it instantly
instead of re-encoding from scratch. Everything runs on your own PC — nothing
you convert is ever uploaded.
Only re-encodes when there's actually something to change
A lot of converters re-encode every file, every time — even when the source
already matches what you asked for. Convert checks first.
Instant remux
Same codec, different container? Done in seconds
If the source video/audio already matches your target codec and only the container needs
to change (say, MKV to MP4), Convert copies the streams as-is instead of decoding and
re-encoding — a multi-minute job becomes a few seconds, with zero quality loss.
Detected automatically per file, no toggle to remember
Falls back to a normal encode the moment it's actually needed
Works for both video and audio-only conversions
GPU acceleration
Your graphics card does the encoding
NVIDIA NVENC, Intel Quick Sync or AMD AMF — whichever your PC has, detected and offered
automatically. Encoding moves off the CPU, so the rest of your machine stays responsive
while a batch runs.
Batch queue
Convert a folder, not one file at a time
Drop in as many files as you want; set how many run at once and how many CPU threads
each gets. Every file remembers its own settings — change what a new file gets converted
to without touching the ones already running.
Full control, when you want it
Codec, resolution, bitrate, quality — or just pick a format and go
Choose a container (MKV, MP4...) and codec, custom resolution and FPS, video/audio bitrate,
audio frequency and channels, and an encoding quality preset. Save any combination as a
named profile to reuse later with one click, or leave it on defaults and
just drop files in — Convert applies your last settings to everything new automatically.
Saved profiles, switch between them from a dropdown
Once a file starts converting, its settings lock — no accidental mid-job changes
Optional volume normalization for audio tracks
See it running
Five themes. Same tab.
Convert looks like the rest of Download SIU — pick a theme once in Options and
every tab, including this one, follows.
Cyan
Green
Gold
Violet
Crimson
Included with Download SIU
One app, one license, every tab
Convert isn't a separate purchase — it's one of the tabs inside Download SIU, alongside the
downloader, Audio Extract and Subtitle+AI. Start the 5-day trial right inside the app, or
pick a plan.
