Converts MP3 files to AAC format — universal music playback and sharing across all devices and platforms to modern streaming services, YouTube, and devices where AAC is the native codec. All conversion happens locally in your browser with no file size limits.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Convert OGG Vorbis to AAC for Apple and streaming compatibility. Move open audio into mainstream players — local FFmpeg work, unlimited saves.
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.
Convert M4A audio to uncompressed WAV for DAWs and archival — bit-perfect from ALAC sources. Prep Apple recordings for Pro Tools — local FFmpeg work, unlimited saves.
Upgrade one GIF to APNG via FFmpeg apng codec at locked 10fps and source dimensions (Lanczos) — 24-bit color plus 8-bit alpha, no size/quality settings. Result panel shows GIF vs APNG KB with ±% change; saves as <name>.png. Modernize sticker packs — local FFmpeg work, unlimited saves.
Convert JPG photos to modern WebP at ~30% smaller sizes for faster websites. Optimize entire image libraries before deploy — local Canvas work, unlimited saves.
MP3 (MPEG-1 Audio Layer 3) uses lossy compressed encoding and is best for universal music playback and sharing across all devices and platforms. AAC (Advanced Audio Coding) uses lossy compressed encoding and excels at modern streaming services, YouTube, and devices where AAC is the native codec. Converting between them lets you take advantage of each format's strengths — for example, using a compressed format for sharing and a lossless format for editing. All conversion happens locally in your browser with no file size limits.
AAC sounds equal at ~75% the bitrate — 128k AAC matches 192k MP3 roughly. Apple devices and YouTube prefer AAC natively.
128 kbps AAC for portable listening, 192+ for archiving transcoded music. Never transcode below the source bitrate tier.
Lossy-to-lossy always loses a generation — keep it transparent with generous bitrates. Re-rip from CD/lossless where quality truly matters.
No — conversion runs locally in your browser with FFmpeg. Only saves touch the network — downloads are unlimited.
Text to Speech (TTS)
Generate natural-sounding speech from text using your browser's built-in voices. Adjust speed and pitch — download your text as .txt.
Audio Cutter
Trim and cut audio files online — MP3, WAV, M4A, FLAC, and OGG. Set start and end times with sliders, then download the trimmed MP3 clip.
MP3 to WAV
Converts MP3 files to WAV format — universal music playback and sharing across all devices and platforms to professional audio editing, mastering, and archival in DAWs and production software. All conversion happens locally in your browser; files up to 100 MB each.
Speech to Text
Dictate live microphone speech to text in multiple languages through your browser's speech service. Live captions for meetings and notes — free to start, no Toolzum account needed.
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.
Apple Music Preview Extractor
Extracts publicly available 30-second audio preview clips from Apple Music by resolving the store URL. Free to start with no signup.