Gradus 1: Tuum impone OGG fasciculos utens bulla supra vel trahendo et demittendo.
Gradus 2: Preme bullam "Converte" ut conversionem incipias.
Gradus III: Conversum tuum detrahe AAC files
OGG ut AAC Quaestiones Frequentes de Conversionibus
How do I convert OGG audio to AAC without quality loss?
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Upload the OGG file and our converter chooses the AAC codec / bitrate combination that matches the source. Lossless target (AAC = WAV / FLAC / ALAC) preserves every sample; lossy target (AAC = MP3 / AAC / OGG) defaults to 192 kbps which is transparent for spoken-word audiobooks and most music.
What bitrate does the AAC file use?
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Default is 192 kbps for lossy AAC; pass-through for lossless AAC. Override to 320 kbps for audiophile or 64-96 kbps for spoken-word audiobooks (transparent for voice, halves the file size).
Will going from OGG to AAC reduce my audio quality?
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If OGG is lossy and AAC is lossless (e.g. MP3 → WAV), the AAC file is no better than the OGG — you can't recover information that's already been thrown away. If OGG is lossless and AAC is lossy, expect the AAC codec to recompress; at 192 kbps this is transparent for most content.
Does the OGG to AAC converter keep ID3 / metadata tags?
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Yes — title, artist, album, year, track number, album art, and chapter markers (important for audiobooks) are read from OGG and written into the AAC container where the AAC format supports tags. M4B audiobook structure round-trips into M4B and AAX → M4B output.
Can I batch convert hundreds of OGG files to AAC?
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Yes — drop a folder of OGG files in and we process them in parallel. Premium has more parallel workers and no per-file size cap, so a 500-file batch finishes in minutes rather than tens of minutes.
Will the AAC keep the same sample rate as OGG?
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By default yes (48 kHz OGG → 48 kHz AAC). If you need to downsample for compatibility (e.g. 96 kHz → 44.1 kHz for CD burning) the advanced sample-rate option does this with high-quality resampling.
Can I normalize loudness in the OGG to AAC step?
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Yes — the loudness-normalize option applies ITU-R BS.1770 / EBU R128 normalization to the AAC output, targeting -14 LUFS (streaming standard), -16 LUFS (podcast standard), or -23 LUFS (audiobook standard). Useful when batch-converting tracks with varying mastering levels.
Will the AAC play on my car stereo / iPod / audiobook app?
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MP3 plays universally. AAC plays on Apple, most Android, Sonos. FLAC plays on Sonos and Android, less well on older iPods. M4B audiobooks play with chapter navigation on iOS Books, Audiobookshelf, and Smart Audiobook Player. The advanced options include device presets.
Is my OGG file private during conversion?
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Yes — uploaded OGG files are processed in isolated workers and deleted within minutes. We never play, store, or share the audio content. Especially important when working with personal audiobook libraries.
How long does converting a 10-hour audiobook OGG to AAC take?
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Same-codec re-mux: 10-30 seconds. Re-encode to a different codec: typically 10-20% of source duration, so a 10-hour audiobook finishes in 60-120 minutes. Chapter markers survive the round-trip and split cleanly.
Why is the AAC file louder / quieter than the OGG source?
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No automatic gain change happens unless you turn on the normalize option. If you do see a level change, your audio player or media library may be applying ReplayGain or per-track normalization on playback — not us.
Can I convert DRM-protected OGG downloads to AAC?
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No — DRM-encrypted OGG (Audible AAX with personal activation, Apple Music) is encrypted at the bit level and we can't process it. Sources from public-domain audiobook archives, your own recordings, or Bandcamp downloads convert fine.