Even out loud and quiet parts of any audio with dynamics compression — podcasts at one steady volume. Stop riding the volume knob — local processing, unlimited saves.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Level whole audio batches with peak normalization to a target dBFS level (default -3) without crushing dynamics. Networks even out 30 episodes so listeners stop riding volume — local Web Audio work, 2 free batches a day.
Shrink MP3 files by lowering bitrate with quality presets — fit podcasts into feed limits. Cut a 50 MB episode to 15 MB cleanly — local FFmpeg work, unlimited saves.
Combine multiple audio files into one continuous track. Supports crossfade between songs and automatic volume normalization. Perfect for making mixtapes, podcasts, and audiobooks.
Create ZIP archives from your files right in your browser. Bundle loose files into one archive.zip with DEFLATE compression — local JSZip work, unlimited saves.
Shrink JPG, PNG, and WebP photos with an Image Quality slider (10–100%, default 80%) plus a Resolution Scale slider, shown in Before/After panels with exact KB and -% savings. Single-image uploads up to 50MB — local library work, unlimited saves.
Start from the Podcast preset (threshold -24 dB, ratio 4:1, attack 5 ms, release 50 ms, makeup +3 dB): whispers lift, shouts tame, nothing pumps. Music and Voice Over presets retune the same six knobs — adjust by ear from there.
Compression squeezes dynamics first (then makeup gain); normalization only shifts overall level. Uneven recordings need compression; uniformly quiet ones need normalization.
Only with aggressive ratios (8:1+) and fast release — pumping artifacts. Conservative podcast settings stay transparent.
No — compression runs locally in your browser. Only saves touch the network — downloads are unlimited.
MP3 Compressor
Shrink MP3 files by lowering bitrate with quality presets — fit podcasts into feed limits. Cut a 50 MB episode to 15 MB cleanly — 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.