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Convert & compress

Convert & compress

Turn videos, sounds and pictures into the formats editors and platforms ask for: MP4, WebM, MOV, ProRes with transparency, GIF, WAV, MP3, FLAC, PNG, JPG, WebP. Presets for YouTube, Shorts, Instagram, TikTok, Spotify Canvas and Discord. Everything runs in your browser; nothing is uploaded.

Drop videos, sounds or pictures here, or

Choose files

Up to 20 files, 1 GB each. Nothing is uploaded: every file is converted on this device.

Platforms

Editors

Audio

GIF

Pictures

Output format

Video

MP4 (H.264 + AAC)Plays everywhere: YouTube, Instagram, TikTok, phones, every editor.WebM (VP8 + Vorbis)Small, for the web, OBS and browsers; can keep transparency.MOV (H.264 + AAC)QuickTime, for Final Cut and iMovie.MOV (ProRes 4444)Edit-grade with transparency, for After Effects, Premiere, Final Cut and CapCut. Large files.GIFA looping animation without sound.

Sound

MP3The universal compressed format.WAV (16-bit PCM)Uncompressed, for the editors and distribution.OGG (Vorbis)Open, small, for games and the web.FLACLossless and about half the size of WAV.M4A (AAC)Apple devices and podcasts.

Pictures

PNGLossless, keeps transparency.JPGPhotos and thumbnails; no transparency.WebPSmall, keeps transparency, for the web.AVIFSmallest for the web, where this browser can write it.

Frame

The picture keeps its own shape.

Largest size

Shrinks to fit; never enlarges.

Frames per second

File size

Quality decides the size.

Speed

Smaller files take longer: FFmpeg runs on one processor core in the browser.

Quality: 80%

Lower is smaller.

Trim

Start (seconds)End (seconds)

Leave empty to keep the whole file.

Remove the sound

Sound bitrate

Sample rate

Channels

Loudness

One-pass EBU R128 normalisation. For EQ, compression and a true-peak limiter use the Mastering tool.

The FFmpeg engine (about 31 MB) downloads when the first video or sound starts, once.

Pictures to pictures use your browser's own encoders. Video and sound use FFmpeg compiled to WebAssembly (GPL-2.0-or-later), loaded from this site and run on one processor core, so long 1080p videos take minutes. See the licences for its source.

Weave sound into sight.

Build audio-reactive videos with 44 production engines, 270 editable modes, the guided Classic editor, and the advanced Studio workstation.

Sonic Weaver, a Novus Stream Solutions product.

© 2026 Novus Stream Solutions.
All rights reserved.
This application was built with AI assistance under human direction.

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Classic
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Playlist
Background Motion
Generate visualizer
Stem Splitter
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Transitions
Intros and outros
Motion graphics
Free assets
Lyric video
Cover art & Canvas
Thumbnail maker
Watermarks
Stream overlays
Sound effects
Mastering
Convert & compress

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More from Novus Stream Solutions

Novus Stream Solutions (separate site, novusstreamsolutions.com)The publisher behind Sonic Weaver, and home of the apps it retired and plans to bring back.
Testaroo (separate site, www.testaroo.com)Generated sample files with exact spec sheets, including audio and video in specific codecs and containers, for testing an import or an export path without risking a real track.

Copyright-Free

All visualizers are copyright-free: you own your exports. Use them anywhere, commercially or personally, without restriction. No attribution required.

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Create

Start a visualizer, or open one of the other makers.

Visualizers

ClassicGuided: pick a look, drop a track, export
StudioAdvanced: node-graph workstation for custom visualizers
PlaylistSongs plus a visualizer each, one exported video
Background MotionCreate and animate image-led visualizers with local V3 recipes
Generate visualizerTurn a picture into a visualizer: lights glow, sparks fly, the subject bounces on the beat
Stem SplitterSeparate stems and mix or master audio in your browser
LayersLayers inside every visualizer: snow, fireworks, lights and more
Layer assetsEvery visualizer layer on its own: preview, download and open in an editor
TransitionsEvery transition and effect for the Timeline, playing
Intros and outrosAnimated title intros and outros for your videos

More makers

Motion graphics
Free assets
Lyric video
Cover art & Canvas
Thumbnail maker
Watermarks
Stream overlays
Sound effects
Mastering
Convert & compress

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