1Upload the OGG audio files whose level you want to change.
2Set a gain in decibels or as a percentage — positive to boost, negative to bring it down.
3Run it; headroom is checked first, so a boost that would clip is flagged rather than silently squared off.
4Download the adjusted OGG file.
Adjust OGG Volume FAQ
Can I adjust a whole batch to the same gain?
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Yes, though be careful what you are asking for: the same gain on files recorded at different levels keeps them at different levels. If you want them to match, normalise instead.
How does Adjust OGG Volume change the level?
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Concretely, the gain is applied after decoding and the file is re-encoded, which costs one generation — so set the level you want in one pass rather than nudging it repeatedly, and use normalisation instead if what you want is a consistent perceived loudness. You set a gain in decibels or as a percentage and it is applied uniformly across the whole file.
Anything specific to OGG to know?
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Yes — the Ogg page structure lets a trim be done by dropping pages, so the surviving audio is bit-identical to the source. Relevant if you plan to adjust the level more than once.
Should I use volume or normalisation?
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Use volume when you know exactly how much louder or quieter you want it. Use normalisation when you want a set of files to end up at the same perceived loudness — that is a measurement problem, not a fixed gain, and applying one when you meant the other is the usual mistake.
What can I upload to Adjust OGG Volume?
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MP3, AAC, M4A, OGG, Opus and WMA are the lossy codecs handled directly, and lossless sources (WAV, FLAC, AIFF) can go in the same batch. The codec is probed from the stream, so an incorrectly named file still works.
Is there a file size limit on Adjust OGG Volume?
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Yes: free accounts process audio up to 200 MB per file, which at typical bitrates is several hours of material; ffmpeg does the decoding and encoding, exactly as it would on a desktop. That is the most generous cap on the site after video, and audio work rarely runs into it.
Will Adjust OGG Volume lower the quality of my OGG audio files?
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A lossy file has already discarded detail once, and re-encoding discards more — that is generation loss and it does not undo. Wherever the job can be completed by copying the encoded stream rather than re-encoding it, that is what happens, and the audio comes back bit-identical.
Can I run Adjust OGG Volume on several OGG audio files at once?
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Yes. Upload the set and they process in parallel with the same settings, which is the practical way to handle a podcast series or an album rather than repeating the job by hand.
Why does a EPUB site host Adjust OGG Volume?
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EPUB.to is built around the open eBook format — XHTML in a zip, reflowable by design, and readable on hardware nobody has thought about the layout for. A book is a zip full of markup, images and fonts, so almost every job people bring to an eBook site is really a job on one of those things. Adjust OGG Volume runs on the same upload and the same account as the conversions because that is where it is needed.
What should I do with the result once Adjust OGG Volume is finished?
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The converter on this site moves books between EPUB, MOBI, AZW3, PDF and DOCX, so a title ends up on whatever hardware is actually going to read it. Doing that after Adjust OGG Volume means the conversion is made from the version you settled on, not from the one you were still fixing.
Is Adjust OGG Volume here the same tool the sibling sites run?
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The engines are shared — the same toolchain, the same workers, the same limits. What a EPUB site adds is a view on reflow: which of these operations a reflowable book genuinely supports, and which ones only make sense on the fixed-layout media inside it. It also starts from one fact about the format this site is named after: the book is a zip of XHTML with a manifest, so the text costs almost nothing and every decision that matters is about the embedded images and font subsets.
Do I need an account, and does anything get kept?
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No account, and nothing is kept: uploads are deleted from the workers shortly after the job finishes, nothing is read and nothing is indexed. Free accounts exist for history and batch size, not for access.
