# MP3 to GSM Converter Convert MP3 audio files to GSM format > Canonical page: https://elysiatools.com/en/tools/mp3-to-gsm - **Category:** Media - **Keywords:** mp3, gsm, audio, converter, voice, speech, telephony, voicemail, transcode ## Overview The MP3 to GSM Converter allows you to easily convert MP3 audio files into the GSM format, which is optimized for telephony applications, PBX systems, and voicemail greetings. By transcoding your standard MP3 files to mono GSM audio, you ensure compatibility with legacy telecom hardware and VoIP platforms. ## Inputs - **Audio File** (file): Upload an MP3 file to convert to GSM - **Audio Channels** (select): GSM is mono-only for telephony applications. - **Keep Metadata (when available)** (checkbox): Preserve title/artist tags when possible ## When to use - When preparing custom audio greetings or interactive voice response (IVR) prompts for PBX systems that require the GSM format. - When optimizing voice recordings to save storage space on legacy telecom servers that only support mono GSM audio. - When converting MP3 voice messages or call recordings to the standard GSM format for integration into telephony databases. ## How it works - Upload your source MP3 audio file (up to 20MB) using the file selector. - Choose the audio channel configuration (GSM defaults to Mono for telephony compatibility) and decide whether to preserve metadata tags. - Click the convert button to transcode the MP3 audio into a standard GSM file ready for download. ## Use cases - Creating custom IVR menu prompts and automated greetings for Asterisk or other PBX phone systems. - Converting MP3 voice notes into GSM format for legacy voicemail archiving. - Preparing call center hold music or announcements that match telephony hardware specifications. ## Frequently asked questions ### Why does the converter only support Mono output? The GSM format is designed specifically for telephony and voice applications, which standardly use single-channel (mono) audio. ### What is the maximum file size I can upload? You can upload MP3 files up to 20 MB in size. ### Will the converted GSM file preserve my MP3 tags? Yes, if you check the 'Keep Metadata' option, the tool will attempt to preserve title and artist tags where supported. ### Can I use this tool for music files? While you can convert music, GSM is highly compressed and optimized for speech, so music quality will be significantly reduced. ### Do I need special software to play the output GSM file? GSM files can be played using compatible media players like VLC or directly imported into VoIP and PBX systems. ## Related tools - [AMR to MP3 Converter](https://elysiatools.com/en/tools/amr-to-mp3): Convert AMR (Adaptive Multi-Rate) audio files to MP3 format - [Batch Audio Converter](https://elysiatools.com/en/tools/audio-batch-converter): Convert multiple audio files between different formats like MP3, WAV, FLAC, AAC, OGG, Opus with quality settings and batch processing - [Audio Codec Swap](https://elysiatools.com/en/tools/audio-codec-swap): Change the codec of an audio file within a chosen output format - [Audio Format Converter](https://elysiatools.com/en/tools/audio-converter): Convert audio files between different formats like MP3, WAV, FLAC, AAC, OGG with quality settings and volume adjustment - [GSM to MP3 Converter](https://elysiatools.com/en/tools/gsm-to-mp3): Convert GSM audio files to MP3 format - [MP3 to AMR Converter](https://elysiatools.com/en/tools/mp3-to-amr): Convert MP3 audio files to AMR (Adaptive Multi-Rate) format - [Video Audio Extract Enhanced](https://elysiatools.com/en/tools/video-audio-extract-enhanced): Extract audio from video files with advanced options - multiple formats, quality settings, and audio enhancement - [AAC to MP3 Converter](https://elysiatools.com/en/tools/aac-to-mp3): Convert AAC audio to MP3 with controllable bitrate, resampling, and channel selection ## Samples - [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio - [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music - [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music - [GSM Audio Sample](https://elysiatools.com/en/samples/gsm-samples): GSM encoded audio sample for telephony playback, upload, and format conversion workflows ## Related content - [Voice Codec, PCM, and Legacy Audio Compatibility Workflows](https://elysiatools.com/en/hubs/voice-codec-pcm-compatibility): Diagnose codec and sample-format mismatches, convert AMR and GSM voice files, bridge PCM and WAV, and prepare legacy DTS or DSD assets for delivery. - [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows. - [Audio Editing and Cleanup Tools](https://elysiatools.com/en/hubs/audio-utility): Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows. - [Audio Preview, Tone, and Effect Generator Tools](https://elysiatools.com/en/hubs/audio-generate): Compare audio preview generation, silence creation, ringtone building, fingerprinting, loudness reports, and effect-style audio generators in one hub.