APE to GSM Converter
Processing entirely on your device — large files may take a moment.
Monkey's Audio and GSM 06.10 Speech exist for different jobs: APE (Monkey's Audio) squeezes music harder than FLAC at the cost of slower decoding — the audiophile archiver of the 2000s, still everywhere on music forums. Convert GSM speech recordings to WAV or MP3.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How APE compares to GSM
| APE | GSM | |
|---|---|---|
| Structure | MAC header + APE frames | Raw GSM frames (33 bytes/20ms) |
| Types / schema | Lossless, 16-32-bit PCM | Lossy speech codec (RPE-LTP) |
| Compatibility | ffmpeg,foobar2000, Monkey's Audio | Asterisk, SoX, ffmpeg |
| Best for | Music forum album archives | Telephony recordings |
How to convert APE to GSM
- 1
Select your files
Drag & drop your APE files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to GSM". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted GSM file individually, or grab everything at once as a ZIP archive.
About the APE format
Monkey's Audio (APE) is the compression-per-bit champion of lossless audio: typically 5-8% smaller than FLAC, paid for with CPU-heavy decode. An entire decade of music-forum album shares from the mid-2000s exists only as APE, often split into .cue-sheet + single-image files.
Conversion to FLAC keeps every sample and finally makes the album playable in car stereos and phones; the ffmpeg APE decoder handles the standard versions including the 4000-series compression.
+ Strengths
- ✓Best-in-class lossless ratios
- ✓Free and open (original was freeware)
- ✓Cue-sheet album pairs are common
! Limitations
- −Decode speed is 5-10x slower than FLAC
- −Almost no hardware support
- −Format stability criticized historically
About the GSM format
GSM 06.10 is the speech codec of the original GSM mobile network — 13 kbit/s RPE-LTP that made digital cellphone calls possible in 1991 and still lives inside VoIP systems, old answering machines and Asterisk PBX recordings.
It is lossy speech, not music: converting GSM to WAV or MP3 preserves intelligibility perfectly while finally letting desktop players open the file without special codecs.
+ Strengths
- ✓Tiny bitrate for speech intelligibility
- ✓Ubiquitous in telephony systems
- ✓Decodes natively via ffmpeg
! Limitations
- −Speech-only quality — music falls apart
- −13 kbit/s artifacts are audible
- −8000 Hz sample rate only
Why convert APE to GSM?
Think of it as moving your file to the container that fits the job. Decode speed is 5-10x slower than FLAC GSM works differently: Tiny bitrate for speech intelligibility If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this APE to GSM converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for APE to GSM?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Can I convert a whole folder of APE files?
You can select many files at once and they are processed in a single batch. Output files land in one ZIP download when there is more than one result.
Will converting APE to GSM reduce audio quality?
If GSM is lossless, the output contains everything the APE file contains — no further loss is added. If GSM is lossy, one recompression pass is unavoidable; the quality slider controls how much. Loss that already happened in the source file can never be undone by converting.