Free Audio Compressor
Make audio files smaller for WhatsApp, email, Discord, and web uploads. Drop in any MP3, WAV, OGG, FLAC, AAC or M4A — pick a bitrate or a target file size, download a compressed MP3. Your audio never leaves your device.
Why compress audio?
Audio files are big — a 3-minute song at CD quality is roughly 30 MB. Most platforms cap file uploads well below that, and even when they don't, smaller files send faster, eat less data on mobile, and don't get rejected at the door. SnipSound's compressor shrinks any audio file to fit your destination by lowering its bitrate to a high-quality MP3 (the most universally supported compressed audio format).
How to compress audio for WhatsApp, email, and Discord
Pick the For a platform tab, choose where you're sending the file, and we'll auto-select a bitrate that lands well under the platform's limit. Or pick Target file size if your destination has a specific cap (a school upload form, an embed in a Notion doc, an email signature). For more control, use Custom bitrate to dial it in by ear.
Platform file size limits
💬 WhatsApp ~16 MB
Documents go up to 100 MB, but voice notes and shared chats are most reliable at 16 MB or less.
📧 Email (Gmail / Outlook) 25 MB
Hard cap on attachments. Gmail will silently route to Drive at the limit.
💜 Discord (free) 10 MB
Nitro Basic raises to 50 MB, Nitro to 500 MB.
📨 SMS / MMS ~1 MB
Carrier-dependent; most US carriers cap MMS attachments around 1 MB.
📱 Slack (free) 1 GB
Generous, but smaller files cut history quota usage in shared channels.
🌐 Web embed any
No cap, but smaller files load faster and rank better in Core Web Vitals.
Bitrate guide — what each level sounds like
Bitrate is the most important quality knob in MP3 compression. Higher bitrate = more audio data per second = bigger file but better sound. Reference for 1 minute of stereo audio:
320
Near-CD quality
~2.4 MB / min
Highest standard MP3 bitrate. Most listeners can't distinguish it from CD audio.
256
High quality (iTunes default)
~1.9 MB / min
Indistinguishable from 320 to most listeners on most material. Apple Music's AAC at 256 is comparable.
192
Standard music quality
~1.4 MB / min
The casual-listening floor — sounds great in earbuds, light artifacts on demanding material in good headphones.
128
Sharing-friendly
~960 KB / min
Half the size of 256 with audible compression on cymbals and reverb tails. Fine for podcasts, voice notes, sharing in a hurry.
96
Voice / podcast
~720 KB / min
Speech sounds clean; music sounds noticeably compressed. Good for podcast distribution and language-learning files.
64
Mono voice memo
~480 KB / min
Below this, music becomes unpleasant. Voice is still intelligible. WhatsApp voice notes use roughly this bitrate.
32
Smallest usable
~240 KB / min
Smallest standard bitrate. Use only when size is critical and audio is voice-only.
Related tools
Audio compressor FAQ
How do I compress an audio file for WhatsApp?▼
Drop your audio file onto the page, pick the WhatsApp preset (16 MB), and click Compress. WhatsApp documents (which include audio) cap out at 100 MB, but voice notes and shared chats work best under 16 MB so they preview and send quickly on slow connections.
How small can I compress an MP3?▼
You can drop bitrate as low as 32 kbps, which is roughly 1/10 the size of a 320 kbps MP3 but audibly degrades music. For voice and podcasts, 64–96 kbps is usually the sweet spot. For music, 128 kbps is the practical minimum and 192 kbps is the casual-listening floor.
What's the difference between bitrate and file size?▼
Bitrate is how many kilobits of audio data the file stores per second; file size is bitrate × duration. A 1-minute MP3 at 128 kbps is about 960 KB; at 320 kbps it's about 2.4 MB. Lower bitrate = smaller file but less audio fidelity.
Will compression reduce the audio quality?▼
Yes — MP3 is a lossy codec, so reducing bitrate discards more frequency information. The audible loss depends on the source: voice recordings tolerate 64–96 kbps comfortably; music starts to feel "thin" below 128 kbps; demanding listeners notice the difference below 192 kbps.
Is my file uploaded to a server?▼
No. SnipSound's compressor runs entirely in your browser using lamejs. Your audio never leaves your device.
What input formats can I compress?▼
Any format your browser can decode — MP3, WAV, OGG, FLAC, AAC, M4A and more. The output is always MP3 because it's the most universally supported compressed format.
Can I compress lossless audio (WAV/FLAC) without quality loss?▼
Not with MP3 — MP3 is always lossy. To shrink lossless audio while staying lossless, use the FLAC option in our
Audio Converter (FLAC files are typically about 55% the size of WAV). If you don't need bit-perfect quality, MP3 at 256–320 kbps is much smaller and most listeners won't tell the difference.
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