Reduce vocals from stereo tracks using center-channel cancellation (works best on studio mixes; not AI stem separation). Audio never leaves your device — conversion and editing run locally in your browser with FFmpeg WASM.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Apply smooth volume fades to your audio tracks. Supports fade in, fade out, or both with linear, logarithmic, exponential, and S-curve transitions. Perfect for podcast intros and outros.
Convert AIFF audio files to MP3 format directly in your browser. Audio never leaves your device — conversion and editing run locally in your browser with FFmpeg WASM. Private and free. from studio masters to portable size.
Compress WAV masters to FLAC at ~60% size with zero loss — the archival standard. Archive studio recordings properly — local FFmpeg work, unlimited saves.
Simplify any two-number ratio to lowest terms via GCD — paint mixes, screen sizes, shares. Reduce 150:225 to 2:3 in one pass — free, runs locally.
Trims PDF file size by stripping redundant metadata and optimizing object streams — best on text-heavy documents. Cannot recompress embedded images (the main size driver); for scan-heavy PDFs use Bulk PDF Size Reducer. Handles PDFs up to 125MB.
It uses center channel removal. The tool subtracts the left and right audio channels, which cancels out everything panned to the center of the stereo mix — typically where vocals sit — while leaving side-panned instruments intact. It runs entirely in your browser using FFmpeg, so your audio never leaves your device.
Center channel removal works best on studio stereo recordings where vocals are cleanly centered. Mono recordings, live performances, and songs with heavily panned or reverb-heavy vocals will produce artifacts and bleed-through. There is no way around this with a frequency-based tool — for perfect separation you would need AI-based stem splitting.
Yes. Select the 'Both Tracks' mode and the tool generates two files — an instrumental (karaoke) version and an acapella (vocals-only) version — each with its own preview player and download button.
MP3, WAV, M4A (AAC), FLAC, and OGG Vorbis. Choose MP3 for small, universally playable files, WAV or FLAC when you need lossless quality for further editing, and OGG or M4A when you need better compression than MP3 at the same bitrate.
Yes. The FFmpeg engine loads once and then all processing happens locally in your browser. Your audio file is never uploaded, making this tool safe for unpublished songs or sensitive recordings.
Noise Reducer
Remove hiss, hum, and background noise from recordings with profile-based reduction. Rescue fan-noisy interviews in one pass — local FFmpeg work, unlimited saves.
Audio Equalizer
Shape audio with multi-band EQ — boost bass, cut mud, add air to dull recordings. Fix a boomy room recording fast — local processing, unlimited saves.