Speex, open-source speech codec for VoIP and voice — stored as audio/speex — uses lossy encoding to handle voip telephony, voice chat, speech compression. Typical file sizes: varies by content.
FLAC (Free Lossless Audio Codec) provides lossless compression of digital audio without any quality loss, reducing file size by 50-60%.
Reach for SPX when your priority is voip telephony, voice chat, speech compression — its efficient compression makes sharing fast and storage minimal.
Reach for FLAC when your priority is archival audio, audiophile listening — its uncompromising quality ensures every detail is preserved.
Learn more about SPX and FLAC formats in our detailed guide.
Convert SPX files to FLAC online for free. High-quality conversion with no registration required.
Upload or enter a URL to convert SPX to FLAC instantly
or paste from clipboard
.spx,.SPX (max 100MB)
Verifying security check…
SPX (SPX) - Speex, open-source speech codec for VoIP and voice. Best for voip telephony, voice chat, speech compression.
FLAC (FLAC audio) - Free Lossless Audio Codec, high-quality compressed audio. Ideal for archival audio, audiophile listening.
Yes, GoConvertFile offers free conversion of SPX to FLAC for files up to 100MB. No registration required.
Most SPX to FLAC conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.
FLAC is ideal for archival audio, audiophile listening. Free Lossless Audio Codec, high-quality compressed audio
No, converting SPX to FLAC does not cause additional quality loss — FLAC uses lossless compression. However, any artifacts already present in the original SPX file will persist in the FLAC output.
FLAC files are typically 2-5x larger than equivalent SPX files because FLAC preserves all pixel data. This is expected and necessary for lossless quality.