Practical focus
Use this page when you need to compress several related audio files with consistent settings.
Private browser-based audio compression
Batch Audio Compressor
Batch compress voice memos, podcast clips, sound effects, and audio asset folders with one settings pass.
Selected audio is processed locally by this tool; the audio pipeline does not send it to an upload API.
MP3 / WAV / M4A / AAC / OGG / FLAC inputMP3M4A / AACOGG
File-
Size-
Duration-
Detected container-
Detected codec-
Source average bitrate-
Source rate / channels-
Selected audio is processed locally by this tool; the audio pipeline does not send it to an upload API.
Compression mode
Advanced settings
Target-size plan
Requested target-
Encoding budget-
Theoretical maximum bitrate-
Planned encoder bitrate-
Estimated output range-
Channel choice-
The estimate reserves space for container and metadata. The finished download is measured and probed again.
| Duration | Planned maximum |
|---|
Select an audio file to begin.
Verified compression result
Original size-
Actual output size-
Size change-
Actual container / codec-
Actual average bitrate-
Actual rate / channels-
Actual duration-
Output metadata detected-
Target / actual-
Target check-
Controlled target retry-
The batch page enforces 20 files and 500 MiB total with one active encoding job. One failure does not stop the remaining files; successful results can be downloaded separately or packaged into a local ZIP.
Quick tips
- Batch works best for similar files.
- Test one sample before processing the whole set.
- Do not load too many huge files at once.
How to use
- Start with one representative file and confirm the bitrate, format, and channel settings sound right.
- Add files that are similar in content, such as a set of voice memos or podcast clips.
- Use the same settings for a batch when consistent loudness and quality expectations matter.
- Download files individually or as a ZIP when the batch is complete, then spot-check several outputs.
Recommended settings
| Batch type | Suggested approach |
|---|---|
| Voice memo batch | MP3, mono, 64-96 kbps |
| Podcast clips | MP3, 96-128 kbps |
| Sound effects | OGG/MP3, 64-128 kbps |
| Mixed music files | Avoid one-size-fits-all settings |
| Large WAV batch | Process fewer files at a time |
Supported formats
Batch input can include common audio formats such as MP3, WAV, M4A, AAC, OGG, and FLAC.
MP3 is the simplest shared output; OGG may fit game or web asset batches.
Quality vs file size
Batch compression is about consistency and time saving, not a magic setting for every file.
A single bitrate may work for a group of voice memos but not for a mixed folder of music, effects, and lectures.
Privacy and local processing
Compression runs in your browser, so the original audio is not uploaded to a server.
Large files can still be slow because decoding and encoding use your device memory and CPU.
Things to watch
- Large batches use significant browser memory.
- Mixed content should be split into smaller groups with different settings.
FAQ
How many audio files can I compress at once?
The page enforces at most 20 files and 500 MiB total. A smaller batch is safer on memory-limited phones.
Should I use the same settings for every file?
Yes for similar files; no for mixed music, voice, and effects.
Can I download all compressed files as a ZIP?
Yes. After sequential processing, successful outputs can be packaged into one uncompressed ZIP in the browser; failed files are listed separately.
Why is batch compression slow?
Each file is inspected, decoded, encoded, and verified locally with one active task.
Should I test one file before compressing the whole batch?
Yes. A sample test avoids wasting time on poor settings.