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.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Convert MP3 to AAC for better quality per bit on Apple devices and streaming. Modernize libraries for smaller sizes — local FFmpeg work, unlimited saves.
Convert OGG Vorbis to AAC for Apple and streaming compatibility. Move open audio into mainstream players — local FFmpeg work, unlimited saves.
Convert OGG Vorbis to FLAC for lossless archival uniformity. Standardize libraries on FLAC without quality illusions — local FFmpeg 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.
Burn text watermarks into a video with 5 position presets (bottom-right default, fixed 24px white on semi-transparent black box). Brand one clip at a time — local FFmpeg work, unlimited saves.
64–128 kbps mono for talk (the tool offers 32, 64, 128, and 192 kbps): a 50 MB stereo music-encode episode drops near 15 MB at 64k with zero audible loss on voices. Music needs 128–192 kbps stereo minimum.
Not on voice at 96k+ or music at 128k+ through earbuds and laptop speakers. Audiophile setups reveal artifacts first — keep FLAC masters regardless.
Roughly proportional to bitrate ratio: 320→128 kbps cuts ~60%. A 30-minute 320k file (~72 MB) lands near 29 MB at 128k.
No — compression runs locally in your browser with FFmpeg. Saves never touch a meter — downloads on local tools are unlimited.
Audio Compressor
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.
Audio Format Converter
Convert between MP3, WAV, FLAC, OGG, M4A, and AAC audio formats. Pick any input and output format — your files never leave your device.