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formeo merged 1 commit into from
Oct 22, 2026
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Search-focused copy for Audio Joiner, Audio Compressor and Voice to Text #19

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84 changes: 59 additions & 25 deletions audio-compressor/index.html
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Expand Up @@ -13,9 +13,9 @@
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<title>Audio Compressor — Reduce File Size Free | AudioTools.dev</title>
<meta name="description" content="Compress audio files online for free. Reduce MP3, WAV file size by adjusting bitrate and sample rate. No upload, runs in your browser.">
<meta name="keywords" content="audio compressor, reduce audio file size, compress mp3 online, shrink audio file, audio bitrate reducer, compress wav free">
<title>Compress MP3 &amp; Audio Files Online, Free | AudioTools.dev</title>
<meta name="description" content="Make audio files smaller for email or chat. Pick a bitrate, see the new size first, compress one file or a batch. Free, no upload, runs in your browser.">
<meta name="keywords" content="compress mp3, reduce audio file size, audio compressor, make audio file smaller, compress audio for email, mp3 compressor online, compress wav to mp3">
<link rel="canonical" href="https://audiotools.dev/audio-compressor/">
<link rel="alternate" hreflang="en" href="https://audiotools.dev/audio-compressor/">
<link rel="alternate" hreflang="zh" href="https://audiotools.dev/zh/audio-compressor/">
Expand All @@ -24,22 +24,22 @@
<meta property="og:site_name" content="AudioTools.dev">
<meta property="og:locale" content="en_US">
<meta property="og:url" content="https://audiotools.dev/audio-compressor/">
<meta property="og:title" content="Audio Compressor — Reduce File Size Free | AudioTools">
<meta property="og:description" content="Compress audio files online for free. Reduce MP3, WAV file size by adjusting bitrate and sample rate. No upload, runs in your browser.">
<meta property="og:title" content="Compress MP3 &amp; Audio Files Online, Free">
<meta property="og:description" content="Make audio files smaller for email or chat. Pick a bitrate, see the new size first, compress one file or a batch. Free, no upload, runs in your browser.">
<meta property="og:image" content="https://audiotools.dev/og/audio-compressor.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="Audio Compressor — Reduce File Size Free | AudioTools">
<meta property="og:image:alt" content="Compress MP3 &amp; Audio Files Online, Free">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Audio Compressor — Reduce File Size Free | AudioTools">
<meta name="twitter:description" content="Compress audio files online for free. Reduce MP3, WAV file size by adjusting bitrate and sample rate. No upload, runs in your browser.">
<meta name="twitter:title" content="Compress MP3 &amp; Audio Files Online, Free">
<meta name="twitter:description" content="Make audio files smaller for email or chat. Pick a bitrate, see the new size first, compress one file or a batch. Free, no upload, runs in your browser.">
<meta name="twitter:image" content="https://audiotools.dev/og/audio-compressor.png">
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{
Expand All @@ -48,18 +48,26 @@
"mainEntity": [
{
"@type": "Question",
"name": "How much can I reduce file size?",
"name": "How do I reduce the size of an MP3 file?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Depending on the source, you can reduce WAV files by 5–20x by converting to MP3. A 50 MB WAV becomes ~5 MB at 128 kbps."
"text": "Re-encode it at a lower bitrate. Drop the MP3 here, pick 128 kbps or 64 kbps, and download the smaller file. Lowering the sample rate to 22050 Hz shrinks voice recordings further."
}
},
{
"@type": "Question",
"name": "How much smaller will my file be?",
"acceptedAnswer": {
"@type": "Answer",
"text": "About 1 MB per minute at 128 kbps and 0.5 MB per minute at 64 kbps. A WAV file usually becomes 5 to 20 times smaller. The tool shows the estimate before you compress."
}
},
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"name": "Does compression affect quality?",
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"text": "Lossy compression removes some data. At 192 kbps or higher, most listeners cannot tell the difference from the original."
"text": "Lossy compression removes some data. At 192 kbps or higher, most listeners cannot tell the difference from the original; for speech, 64 kbps is enough."
}
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{
Expand All @@ -70,12 +78,20 @@
"text": "Yes. Drop several files: all of them are compressed with the same settings, and you can download each one or all of them as a ZIP."
}
},
{
"@type": "Question",
"name": "Which sample rate should I use for voice?",
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"text": "22050 Hz keeps speech clear and makes the file smaller. 16000 Hz is the smallest and still fine for speech, but not for music."
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"name": "Is my audio uploaded?",
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"text": "No. All compression happens in your browser using the Web Audio API."
"text": "No. All compression happens in your browser."
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]
Expand Down Expand Up @@ -153,8 +169,8 @@
<div class="container">
<section class="hero">
<svg class="hero-glyph" viewBox="0 0 160 56" aria-hidden="true"><polyline class="g-ink" style="stroke-width:1.6" points="4,28 7,14 10,40 13,18 16,36 19,10 22,44 25,20 28,34 31,12 34,42 37,22 40,30 43,16 46,38 49,24 52,32 55,20 58,28"/><polyline class="g-acc" points="72,28 88,14 104,40 120,16 136,38 152,24 156,28"/></svg>
<h1>Audio Compressor</h1>
<p>Reduce audio file size by adjusting bitrate and sample rate — output as MP3, no upload</p>
<h1>Compress Audio Files</h1>
<p>Make MP3, WAV and other audio files smaller — choose the bitrate, see the size first, no upload</p>
</section>

<div class="tool-area">
Expand Down Expand Up @@ -226,21 +242,39 @@ <h1>Audio Compressor</h1>
</div>

<section class="seo-content">
<h2>Free Online Audio Compressor</h2>
<p>Audio Compressor reduces the file size of your audio by re-encoding it to MP3 at a bitrate and sample rate you choose. Perfect for fitting audio into email attachments, messaging apps, or storage limits.</p>
<h3>How It Works</h3>
<p>Lossy MP3 compression removes inaudible data to shrink the file. A 44 MB WAV can become a 4 MB MP3 at 128 kbps — roughly a 10x reduction with minimal quality loss for most uses. Higher bitrates (256–320 kbps) preserve more detail for music. Everything runs in your browser, with the LAME MP3 encoder compiled to WebAssembly — nothing is uploaded.</p>
<h3>Choosing the Right Bitrate</h3>
<p>64 kbps — voice recordings and podcasts (smallest files). 128 kbps — general purpose, good quality for most uses. 192 kbps — high quality for music. 320 kbps — maximum quality, indistinguishable from uncompressed for most listeners. Lowering the sample rate to 22 kHz or 16 kHz shrinks speech files further.</p>
<p>Need other edits? Try our <a href="/converter/">Audio Converter</a>, <a href="/audio-trimmer/">Audio Trimmer</a>, <a href="/audio-joiner/">Audio Joiner</a>, or <a href="/volume-booster/">Volume Booster</a>.</p>
<h2>Compress MP3 and other audio files online</h2>
<p>Audio Compressor makes audio files smaller by re-encoding them to MP3 at the bitrate and sample rate you choose. It shows the expected size before you start, handles one file or a whole batch, and runs in your browser with the LAME MP3 encoder compiled to WebAssembly, so nothing is uploaded.</p>
<h3>How to compress an audio file</h3>
<ol>
<li>Drop one or several files on the box above (MP3, WAV, M4A, FLAC, OGG).</li>
<li>Choose a bitrate; for speech, a lower sample rate makes the file smaller still.</li>
<li>Check the estimated size.</li>
<li>Click “Compress &amp; Download”. With several files, download each one or all of them as a ZIP.</li>
</ol>
<h3>How small will the file be?</h3>
<p>An MP3's size depends only on its bitrate and length: about 1 MB per minute at 128 kbps and about 0.5 MB per minute at 64 kbps. A 10-minute recording is roughly 10 MB at 128 kbps and 5 MB at 64 kbps.</p>
<h3>Which bitrate to choose</h3>
<ul>
<li>64 kbps — voice recordings, lectures and podcasts (smallest files)</li>
<li>128 kbps — general purpose, good for most uses</li>
<li>192 kbps — music in high quality</li>
<li>320 kbps — maximum quality, for when size matters least</li>
</ul>
<h3>Fit email and chat limits</h3>
<p>Most email services cap attachments at 20–25 MB: roughly 20–25 minutes of audio at 128 kbps, or 40–50 minutes at 64 kbps. For voice, 64 kbps at 22050 Hz keeps speech clear at the smallest size.</p>
<h3>WAV to MP3: the biggest saving</h3>
<p>Uncompressed WAV (CD quality) takes about 10.6 MB per minute. Compressing it to MP3 at 128 kbps makes it about 11 times smaller with little audible difference for most uses.</p>
<p>Need other edits? Join files first with the <a href="/audio-joiner/">audio joiner</a>, cut silence at the ends with the <a href="/audio-trimmer/">audio trimmer</a>, make a quiet recording louder with the <a href="/volume-booster/">volume booster</a>, or save M4A or FLAC with the <a href="/converter/">audio converter</a>.</p>
</section>

<section class="faq">
<h2>Frequently Asked Questions</h2>
<div class="faq-item"><div class="faq-q">How much can I reduce file size?</div><div class="faq-a">Depending on the source, you can reduce WAV files by 5–20x by converting to MP3. A 50 MB WAV becomes ~5 MB at 128 kbps.</div></div>
<div class="faq-item"><div class="faq-q">Does compression affect quality?</div><div class="faq-a">Lossy compression removes some data. At 192 kbps or higher, most listeners cannot tell the difference from the original.</div></div>
<div class="faq-item"><div class="faq-q">How do I reduce the size of an MP3 file?</div><div class="faq-a">Re-encode it at a lower bitrate. Drop the MP3 here, pick 128 kbps or 64 kbps, and download the smaller file. Lowering the sample rate to 22050 Hz shrinks voice recordings further.</div></div>
<div class="faq-item"><div class="faq-q">How much smaller will my file be?</div><div class="faq-a">About 1 MB per minute at 128 kbps and 0.5 MB per minute at 64 kbps. A WAV file usually becomes 5 to 20 times smaller. The tool shows the estimate before you compress.</div></div>
<div class="faq-item"><div class="faq-q">Does compression affect quality?</div><div class="faq-a">Lossy compression removes some data. At 192 kbps or higher, most listeners cannot tell the difference from the original; for speech, 64 kbps is enough.</div></div>
<div class="faq-item"><div class="faq-q">Can I compress several files at once?</div><div class="faq-a">Yes. Drop several files: all of them are compressed with the same settings, and you can download each one or all of them as a ZIP.</div></div>
<div class="faq-item"><div class="faq-q">Is my audio uploaded?</div><div class="faq-a">No. All compression happens in your browser using the Web Audio API.</div></div>
<div class="faq-item"><div class="faq-q">Which sample rate should I use for voice?</div><div class="faq-a">22050 Hz keeps speech clear and makes the file smaller. 16000 Hz is the smallest and still fine for speech, but not for music.</div></div>
<div class="faq-item"><div class="faq-q">Is my audio uploaded?</div><div class="faq-a">No. All compression happens in your browser.</div></div>
</section>
</div>
<footer class="at-footer">
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