CONVERT TTA → GSM (TTA to GSM)
Fast, secure TTA to GSM conversion. No registration required.
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HOW TO CONVERT TTA → GSM
Upload the TTA
Drop or select your TTA file. The upload is encrypted and the file is queued for conversion.
Transcode via FFmpeg
FFmpeg decodes the TTA stream to PCM internally, then re-encodes as GSM at the bitrate you select.
Download the GSM
The GSM is delivered as a direct download; metadata and cover art transfer automatically where possible.
Setup: TTA is the True Audio lossless codec, fast to decode on low-power devices. Goal: an interchangeable GSM. Need a GSM version of a TTA recording for a podcast host, audio book platform or DAW that refuses the original container? Drop the file above and our encoder produces a clean GSM you can drag straight into the destination tool. Metadata such as title, artist and cover art travels with the audio. One more beat. TTA is the True Audio lossless codec, fast to decode on low-power devices. Receiving format: GSM is an audio format with specific trade-offs between file size, bitrate flexibility, and device support.
Why convert TTA to GSM
True Audio Lossless is great in its own niche, but GSM Audio is either more universally playable or better suited to the device you are targeting. Converting lets you ship the audio without asking listeners to install a codec. The loss in quality between the two is negligible at sensible bitrates.
TTA vs GSM — Technical specifications
Side-by-side comparison of the technical details.
TTA
- MIME type
- audio/x-tta
- Extension
- .tta
- Algorithm
- Fixed prediction + adaptive Rice coding
- License
- LGPL
- MIME Type
- audio/x-tta
- Category
- Audio Files
- Full Name
- True Audio Lossless
- Conversion Engine
- FFMPEG
GSM
- MIME type
- audio/gsm
- Extension
- .gsm
- MIME Type
- audio/gsm
- Category
- Audio Files
- Full Name
- GSM Audio
- Conversion Engine
- FFMPEG
- Codec
- GSM 06.10 (RPE-LTP)
- Sample rate
- 8 kHz
- Bitrate
- 13 kbps
| Specification | TTA | GSM |
|---|---|---|
| MIME type | audio/x-tta | audio/gsm |
| Extension | .tta | .gsm |
| Algorithm | Fixed prediction + adaptive Rice coding | — |
| License | LGPL | — |
| MIME Type | audio/x-tta | audio/gsm |
| Category | Audio Files | Audio Files |
| Full Name | True Audio Lossless | GSM Audio |
| Conversion Engine | FFMPEG | FFMPEG |
| Codec | — | GSM 06.10 (RPE-LTP) |
| Sample rate | — | 8 kHz |
| Bitrate | — | 13 kbps |
TTA vs GSM — Strengths and limitations
What each format does best, and where it falls short.
TTA Strengths
- Lossless bit-exact reproduction.
- Fast, low-memory decoding.
- Open-source reference.
- Cue-sheet support.
Limitations
- Compression ratio worse than FLAC.
- Niche tooling.
- Hardware support died with 2000s DAP era.
GSM Strengths
- Tiny bitrate (13 kbps) — hours of speech in a few MB.
- Speech-optimized — clear voice reproduction.
- Universal cellphone decoder adoption 1991-2015.
- Stable since 1987.
Limitations
- Speech-only — music sounds distorted.
- 8 kHz sampling — narrowband, muffled by modern standards.
- Legacy — LTE VoLTE moved to AMR-WB, Opus, or EVS.
Quality & Compatibility
Lossy-to-lossy transcoding (most cross-format audio jobs) loses a tiny amount of quality on each pass — usually inaudible at our default VBR ~190 kbps for music or 96 kbps for speech. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy is only as good as the target bitrate you choose.
Tips for Best Results
- Pick 128 kbps for podcasts and voice, 192–256 kbps for music, 320 kbps only if the audio will be edited further downstream.
- Keep the TTA master alongside the GSM — re-encoding a lossy format twice accumulates audible artefacts.
- For mono voice content, convert to mono GSM explicitly to halve file size without any quality loss.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for GSM and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the TTA container to the GSM container automatically where both formats support them. If a tag field has no GSM equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
True Audio Lossless
Source formatTTA (True Audio) is an open-source lossless audio codec that provides real-time lossless compression with hardware-friendly decoding. It achieves compression ratios similar to FLAC while maintaining very low CPU requirements during playback.
GSM Audio
Target formatGSM 06.10 is a speech compression standard designed for the Global System for Mobile Communications. It encodes speech at 13 kbps using Regular Pulse Excitation with Long Term Prediction, optimized for voice intelligibility over cellular networks.
Going the other way? Convert GSM back to TTA with the same engine.
Common Use Cases
Share across platforms
Send GSM files to anyone without worrying about whether they have the right software for TTA.
Embed in documents
Drop GSM output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
GSM often produces smaller files than TTA for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
TTA vs GSM — Typical file sizes
Approximate file sizes for common scenarios.
- 3-min song (CD) 20-25 MB
- Full CD album 250-350 MB
- 1 min of voice ~100 KB
- 1 hour voicemail archive ~6 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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