Your Podcast Episode Is 200 MB. Your Host Caps at 100 MB.
You’ve recorded a podcast and the WAV file is enormous. Anchor wants it under 200 MB per episode. Libsyn has a monthly storage cap. Even if the platform accepts it, your listeners on cellular are going to burn through their data plan downloading a single episode.
The fix is simple: re-encode at a lower bitrate. A 50 MB WAV compressed to 128k MP3 becomes roughly 5 MB. That’s a 90% reduction, and spoken-word audio at 128k sounds perfectly clear.
Three Bitrate Options
- 128k: smallest file. Human speech sounds great here. This is what most podcasters use.
- 192k: middle ground. Good for music with some complexity. Most ears can’t tell it apart from the original.
- 320k: largest compressed size but closest to the source quality. Pick this for music you care about or if someone’s going to listen on expensive headphones.
The server runs FFmpeg to re-encode your file. The output is MP3 regardless of what you uploaded.
Steps
- Upload your audio file.
- Pick a bitrate: 128k, 192k, or 320k.
- Click Compress Audio.
- Download the result.
When You Need This
Podcast uploads. Most hosting platforms have storage caps or file size limits. Compressing to 128k keeps episodes small without sacrificing clarity for spoken-word content. A 60-minute episode at 128k is roughly 57 MB as an MP3. Totally reasonable.
Emailing audio files. You recorded a voice memo and want to email it. The raw WAV is 80 MB. Gmail will bounce it. Compress to 128k and it’s under 8 MB, well within limits.
Mobile-friendly streaming. Your listeners on cellular connections care about file size. A 320k stream uses four times the data of a 128k stream. If your content is a talk show, 128k is all they need.
Archiving recordings. You’ve got three years of meeting recordings in WAV format. That’s probably hundreds of gigabytes. Compress them to 128k and you’ll free up 80-90% of that space. The recordings are for reference, not for audiophile playback.
Music with nuance. Guitar harmonics, orchestral dynamics, breathy vocals, if these details matter, go 192k or 320k. At 320k, the difference from the original is essentially inaudible on consumer equipment.
Need a different output format instead of MP3? The Audio Format Converter handles that. Want to cut the file down before compressing? Use the Audio Trimmer first.
FAQ
Which bitrate should I pick? 128k for spoken word and podcasts. 192k for general-purpose music. 320k if quality is the priority and file size is secondary.
How big is the savings? A WAV file compressed to 128k MP3 shrinks by about 90%. A 320k MP3 re-compressed to 128k drops by roughly 60%.
Can I actually hear the difference? At 192k and above, most people honestly can’t on normal speakers or headphones. At 128k, trained ears on studio monitors might notice some high-frequency roll-off. For everyday listening, 128k is fine.
What format comes out? MP3, regardless of input format.
Is my file stored? No. Processed and returned immediately, then discarded.