{"id":1994,"date":"2026-10-24T09:13:00","date_gmt":"2026-10-24T13:13:00","guid":{"rendered":"https:\/\/www.xconvert.com\/blog\/?p=1994"},"modified":"2026-08-31T23:06:22","modified_gmt":"2026-09-01T03:06:22","slug":"audio-compressor-file-size-vs-dynamic-range","status":"publish","type":"post","link":"https:\/\/www.xconvert.com\/blog\/audio-compressor-file-size-vs-dynamic-range","title":{"rendered":"Audio Compressor Means Two Different Things (Size vs Loudness)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Two people search \u201caudio compressor\u201d on the same afternoon. One has a 90 MB voice memo that won\u2019t attach to an email. The other has a podcast where the guest whispers and the host shouts, and wants the levels evened out. They land on the same search results, and roughly half of them are useless to each. The word \u201ccompression\u201d covers two completely unrelated operations in audio, and nobody labels which one they mean.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Quick answer:<\/strong> <strong>Data compression<\/strong> makes the <em>file<\/em> smaller \u2014 fewer bytes for roughly the same sound, controlled with bitrate, sample rate and channel count. <strong>Dynamic-range compression<\/strong> makes the <em>sound<\/em> different \u2014 it squashes the gap between the loudest and quietest parts, controlled with threshold, ratio, attack and release. They share a word and nothing else. <a href=\"https:\/\/www.xconvert.com\/audio-compressor\">xconvert\u2019s audio compressor<\/a> does the <strong>first one only<\/strong> \u2014 there is no gain, normalize, loudness or dynamic-range control anywhere in it, and we would rather say so than let you upload and find out. For the second, use Audacity (free), a DAW, or ffmpeg\u2019s <code>acompressor<\/code> and <code>loudnorm<\/code> filters.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Jump to a section<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#two-jobs\">Two jobs, one word<\/a><\/li><li><a href=\"#file-size\">Data compression: fewer bytes<\/a><\/li><li><a href=\"#dynamics\">Dynamic-range compression: a different sound<\/a><\/li><li><a href=\"#loudness\">Loudness normalization is a third thing again<\/a><\/li><li><a href=\"#tool\">What xconvert does, and where to go for the other one<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"two-jobs\">Two jobs, one word<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"789\" src=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/two-compressors.png\" alt=\"Comparison grid of file-size compression versus dynamic-range compression showing goals, controls, units and where to get each\" class=\"wp-image-1993\" srcset=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/two-compressors.png 1600w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/two-compressors-300x148.png 300w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/two-compressors-1024x505.png 1024w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/two-compressors-768x379.png 768w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/two-compressors-1536x757.png 1536w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The confusion is not the user\u2019s fault. It is genuine terminological collision: engineers named the bitrate-reduction process \u201ccompression\u201d because it compresses data, and named the dynamics processor \u201ccompression\u201d because it compresses the amplitude range. Both are correct in their own field.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The quickest way to work out which one you want: <strong>ask what you are unhappy with.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Unhappy with a <em>number<\/em> \u2014 \u201cit\u2019s 90 MB and the limit is 25\u201d \u2014 you want data compression.<\/li><li>Unhappy with what you <em>hear<\/em> \u2014 \u201cthe quiet bits are inaudible in the car\u201d \u2014 you want dynamics processing.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If you want both, do them in that order: process the dynamics first, encode second. Doing it the other way round means the dynamics processor is working on already-degraded lossy audio, and any re-encode after that stacks a second generation of loss on top.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"file-size\">Data compression: fewer bytes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the file-size job, and there are only four real levers.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Lever<\/th><th>What it changes<\/th><th>Effect on size<\/th><th>Cost<\/th><\/tr><\/thead><tbody><tr><td><strong>Bitrate<\/strong><\/td><td>Bits allocated per second of audio<\/td><td>Directly proportional \u2014 halve the bitrate, halve the file<\/td><td>The main quality lever; artefacts appear as you go low<\/td><\/tr><tr><td><strong>Codec<\/strong><\/td><td>The compression algorithm<\/td><td>Large. Opus and AAC hold up better than MP3 at low bitrates<\/td><td>Compatibility varies by device and platform<\/td><\/tr><tr><td><strong>Channels<\/strong><\/td><td>Stereo \u2192 mono<\/td><td>Roughly halves it for constant-bitrate encodes<\/td><td>Stereo image gone. Fine for speech, not for music<\/td><\/tr><tr><td><strong>Sample rate<\/strong><\/td><td>Samples captured per second<\/td><td>Moderate<\/td><td>Caps the highest frequency reproducible; 44.1 kHz is CD standard<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Two things worth knowing beyond the table. <strong>Lossy encoding is generational<\/strong> \u2014 every re-encode of an already-lossy file discards more, so always compress from the highest-quality source you still have rather than from the MP3 you made last week. And <strong>lossless compression exists too<\/strong>: FLAC and ALAC shrink a WAV with no change to the samples at all, typically to somewhere around half to two-thirds of the original, which is a smaller win than lossy but a mathematically perfect one.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the numbers behind bitrate choices, <a href=\"https:\/\/www.xconvert.com\/blog\/mp3-bitrate-128-vs-256-vs-320\/\">MP3 bitrate: 128 vs 256 vs 320<\/a> has the comparisons.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"dynamics\">Dynamic-range compression: a different sound<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the studio job. A compressor watches the signal level and turns it down whenever it exceeds a set point, then you raise the whole thing back up \u2014 so the loud parts come down, the quiet parts effectively come up, and the distance between them shrinks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Audacity\u2019s own manual states the purpose in one line: \u201cThe Compressor effect reduces the dynamic range of audio.\u201d ffmpeg\u2019s documentation says the same of its <code>acompressor<\/code> filter: \u201cA compressor is mainly used to reduce the dynamic range of a signal.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The controls you will meet, and what each actually does:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Threshold<\/strong> \u2014 the level above which the compressor starts working. Nothing below it is touched.<\/li><li><strong>Ratio<\/strong> \u2014 how hard it works above the threshold. 2:1 means 2 dB over the threshold comes out as 1 dB over. 10:1 and above is effectively limiting.<\/li><li><strong>Attack<\/strong> \u2014 how quickly it clamps down after the signal crosses the threshold. Fast attack catches transients (and can dull a snare or a plosive); slow attack lets them through.<\/li><li><strong>Release<\/strong> \u2014 how quickly it lets go afterwards. Too fast and you hear \u201cpumping\u201d as the background noise rises and falls; too slow and quiet passages stay ducked.<\/li><li><strong>Knee<\/strong> \u2014 how abruptly compression engages around the threshold. A soft knee eases in and sounds more natural on voice.<\/li><li><strong>Make-up gain<\/strong> \u2014 the manual volume boost that compensates for everything the compressor pulled down. This is what turns \u201cquieter overall\u201d into \u201clouder overall.\u201d<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">None of these have any effect on file size. A compressed-dynamics WAV is exactly the same number of bytes as the WAV that went in, because the sample count and bit depth have not changed \u2014 only the values inside have. That is the cleanest way to remember which job is which: <strong>data compression changes the byte count and tries not to change the sound; dynamics compression changes the sound and does not touch the byte count.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"loudness\">Loudness normalization is a third thing again<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Worth separating out, because it is what most people asking for \u201ccompression\u201d on a podcast actually want. Normalization measures the <em>perceived<\/em> loudness of a whole programme and applies one gain change to hit a target. It does not reshape anything \u2014 the dynamics are untouched, the whole thing just moves up or down.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The measurement standard is <strong>LUFS<\/strong> (Loudness Units relative to Full Scale), defined by ITU-R BS.1770 and used by EBU R 128. Every major streaming platform normalizes on playback against it. Spotify publishes its target explicitly: \u201cWe adjust tracks to <strong>-14 dB LUFS<\/strong>, according to the ITU 1770 standard.\u201d It also tells artists to \u201cTarget the loudness level of your master at -14dB integrated LUFS\u201d and \u201cKeep it below -1dB TP (True Peak) max\u201d \u2014 or below -2dB TP for louder masters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The practical consequence for anyone still mastering loud: crushing the dynamics to win a volume war no longer works, because the platform simply turns the result back down to \u221214 LUFS. What you are left with is a quieter <em>and<\/em> flatter track than the person who left headroom.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ffmpeg implements this directly as the <code>loudnorm<\/code> filter \u2014 \u201cEBU R128 loudness normalization,\u201d with an integrated-loudness target that defaults to \u221224.0 LUFS, a loudness-range target of 7.0 and a maximum true peak of \u22122.0. Set <code>I=-14<\/code> if you are aiming at Spotify\u2019s number.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tool\">What xconvert does, and where to go for the other one<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>We do file-size compression only.<\/strong> There is no gain, normalize, loudness, threshold, ratio or make-up gain control anywhere on the <a href=\"https:\/\/www.xconvert.com\/audio-compressor\">audio compressor<\/a> \u2014 not hidden behind a mode, not appearing after upload. If you need to shape dynamics, this is the wrong tool and we are not going to pretend otherwise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To make an audio file smaller:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Open <a href=\"https:\/\/www.xconvert.com\/audio-compressor\">xconvert.com\/audio-compressor<\/a> and click <strong>Upload<\/strong> \u2014 from your computer, Google Drive or Dropbox. It accepts MP3, WAV, FLAC, M4A, AAC, OGG, Opus, AIFF, WMA, AMR and others.<\/li><li>Open <strong>Advanced Options<\/strong>.<\/li><li>Under <strong>Audio File Extension<\/strong>, keep <strong>MP3<\/strong>, choose <strong>Same as source<\/strong> to stay in the format you started with, or pick another \u2014 Opus and AAC hold up better at low bitrates.<\/li><li>Under <strong>File Compression<\/strong>, pick one of the five modes: <strong>File Size Percentage<\/strong> (a 1\u2013100 slider that opens at 80), <strong>Specific file size<\/strong> (a number plus a B \/ KB \/ MB unit dropdown, opening at 8 MB), <strong>Custom Bitrate<\/strong> (opens at 64 kbps), <strong>Constant Bitrate<\/strong> (a fixed ladder from 8 kbps to 384 kbps, with 64 kbps preselected), or <strong>Variable Bitrate<\/strong> (quality-targeted ranges).<\/li><li>Optionally set <strong>Audio Channel<\/strong> to <strong>MONO<\/strong> \u2014 for speech this roughly halves a constant-bitrate file with no meaningful loss \u2014 and <strong>Audio Sample Rate<\/strong> down to 16000 or 24000 Hz for voice-only material. Both default to <strong>ORIGINAL<\/strong>.<\/li><li>Use <strong>Trim<\/strong> if you only need part of the recording; it is set to <strong>Unchanged<\/strong> by default. Then click <strong>Compress<\/strong> and download.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Your file uploads over an encrypted connection, is processed on our servers, and is deleted automatically a few hours later.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For dynamic-range compression or loudness normalization<\/strong>, these are the honest routes:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Audacity<\/strong> \u2014 free and open source, on Windows, macOS and Linux. Its <strong>Compressor<\/strong> effect exposes threshold, ratio, attack, release, knee and make-up gain, and it has a separate <strong>Loudness Normalization<\/strong> effect for hitting a LUFS target.<\/li><li><strong>A DAW<\/strong> \u2014 Reaper, Logic, Ableton, Studio One, GarageBand. Anything with a mixer has a compressor on every channel.<\/li><li><strong>ffmpeg<\/strong> \u2014 <code>acompressor<\/code> for dynamics, <code>loudnorm<\/code> for EBU R128 normalization. Scriptable, free, and the right answer for batches.<\/li><li><strong>A podcast-specific service<\/strong> \u2014 several hosting platforms run loudness normalization automatically on upload, which for most podcasters is enough.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Related: <a href=\"https:\/\/www.xconvert.com\/blog\/compress-audio-without-losing-quality\/\">How to compress audio without losing quality<\/a> for the file-size job in depth.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">FAQ<\/h2>\n\n\n\n<h5 class=\"wp-block-heading\">Does xconvert\u2019s audio compressor have a normalize or gain control?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">No. We checked the entire option tree for this article: there is no gain, normalize, loudness, threshold, ratio, attack, release or make-up gain control on the audio compressor or on any of our audio pages. The controls are output format, file-compression mode (File Size Percentage, Specific file size, Custom Bitrate, Constant Bitrate or Variable Bitrate), audio channel, sample rate and trim. Everything there affects file size, not perceived loudness.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Will compressing a file make the quiet parts easier to hear?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">No \u2014 that is the other kind of compression. Reducing bitrate or converting to a smaller format changes how the audio is <em>stored<\/em>, not its level relationship. A whisper at \u221245 dB is still at \u221245 dB after you halve the file size. If the quiet parts are the problem, you want a dynamics compressor or a loudness normalizer.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Does dynamic-range compression make the file bigger or smaller?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Neither, in itself. Compressing dynamics changes sample values, not sample count or bit depth, so an uncompressed WAV comes out exactly the same size. There is a small indirect effect if you then re-encode to a lossy format \u2014 reduced dynamic range is marginally easier for an encoder to model \u2014 but it is not a size strategy.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">What is LUFS and do I need to care?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">LUFS is a perceived-loudness measurement defined by ITU-R BS.1770, and you care if you publish anywhere that normalizes playback. Spotify states it adjusts tracks to \u221214 dB LUFS and recommends mastering to \u221214 LUFS integrated with true peak below \u22121 dB. If you master far louder, the platform turns it down anyway, so you get the squashed dynamics without the volume.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Which should I do first, dynamics or file-size compression?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Dynamics first, always. Process from the highest-quality source you have \u2014 ideally WAV or FLAC \u2014 then encode to the delivery format once at the end. Encoding first means the dynamics processor operates on audio that already has lossy artefacts, and the re-encode afterwards adds another generation of loss.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Is there a free way to do proper dynamic-range compression?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, several. Audacity is free, open source and cross-platform, with a full Compressor effect (threshold, ratio, attack, release, knee, make-up gain) plus separate Loudness Normalization. ffmpeg\u2019s <code>acompressor<\/code> and <code>loudnorm<\/code> filters are free and scriptable, with <code>loudnorm<\/code> implementing EBU R128 directly. Neither costs anything, and both do a job no file-size converter can do.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Last verified 2026-08-31.<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/support.spotify.com\/us\/artists\/article\/loudness-normalization\/\">Spotify for Artists \u2014 Loudness normalization<\/a> \u2014 \u201cWe adjust tracks to -14 dB LUFS, according to the ITU 1770 standard\u201d; \u201cTarget the loudness level of your master at -14dB integrated LUFS\u201d; \u201cKeep it below -1dB TP (True Peak) max\u201d; and the -2dB true-peak advice for louder masters.<\/li><li><a href=\"https:\/\/manual.audacityteam.org\/man\/compressor.html\">Audacity Manual \u2014 Compressor<\/a> \u2014 \u201cThe Compressor effect reduces the dynamic range of audio,\u201d and the threshold \/ ratio \/ attack \/ release \/ knee \/ make-up gain controls.<\/li><li><a href=\"https:\/\/ffmpeg.org\/ffmpeg-filters.html\">FFmpeg Filters documentation<\/a> \u2014 <code>acompressor<\/code> (\u201ca compressor is mainly used to reduce the dynamic range of a signal\u201d) and <code>loudnorm<\/code> (\u201cEBU R128 loudness normalization\u201d) with its \u221224.0 LUFS integrated default, 7.0 LRA and \u22122.0 true-peak defaults.<\/li><li>xconvert option configuration, checked 2026-08-31 \u2014 the audio compressor\u2019s complete control set, including all five <strong>File Compression<\/strong> modes (File Size Percentage, Specific file size, Custom Bitrate, Constant Bitrate, Variable Bitrate), and confirmation that no gain, normalize, loudness or dynamic-range control exists on any xconvert audio page.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>An audio compressor either shrinks the file or squashes the dynamics. Which one you want, and the free tools that do the job we deliberately don&#8217;t.<\/p>\n","protected":false},"author":3,"featured_media":1991,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,14],"tags":[],"class_list":["post-1994","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to-guides","category-tools"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Audio Compressor Means Two Different Things (Size vs Loudness)<\/title>\n<meta name=\"description\" content=\"An audio compressor either shrinks the file or squashes the dynamics. 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