FLV to NUT - Online Video Converter

Convert FLV to NUT online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.

Convert FLV to NUT

[+] Drop FLV video here or click to select FLV

Output format

NUT (H.264 / AAC)

No transcoding (remux only)[i]

Mode[i]

Simple Advanced

Quality[i]

Resolution[i]

About FLV to NUT

Convert FLV to NUT. FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. NUT is FFmpeg's research container built for seeking and error recovery. Few players open it, so convert for sharing..

Why convert FLV to NUT?

Smaller files with NUT lossy compression.
Keep animation and transparency where supported.
Private, no upload - runs in your browser.

FLV vs NUT

Animation	Yes	Yes
Transparency	No	No
Compression	lossy	lossy
Typical use	FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams.	NUT is FFmpeg's research container built for seeking and error recovery.

When not to convert FLV to NUT

Skip NUT for archival masters: lossy compression discards detail, so keep the FLV original.
Keep a master copy: repeated exports stack small losses, so archive FLV before batch NUT shares.

Limits

Starting point: FLV - FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. Flash-era players are gone, so convert for current browsers. Few players open it, so convert for sharing. Encode NUT (H.264 / AAC) from FLV at a bitrate near the source, and confirm the audio track before converting.

How conversion works

Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.

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FAQ

How do I convert FLV to NUT?

Drop your FLV file onto this page, choose quality and codec settings, then click Convert. The result downloads as NUT instantly. All processing runs in your browser.

What codec is used for NUT?

The default codec for NUT is H.264 / AAC. You can change the video and audio codec in Advanced mode.

How do you store my files?

We do not store any processed videos. All conversion happens entirely in your browser using FFmpeg WASM.