Convert raw, headerless 8-bit G.711 μ-law and A-law telephony speech (.ulaw, .alaw, .pcm, .raw), PBX voicemail recordings, and Cisco call logs into playable 16-bit WAV audio directly in your browser. 100% private with zero server uploads.
Detailed side-by-side format architecture for ULAW Sound Stream / Module (.ulaw) and Waveform Audio File Format (.wav). Every conversion executes strictly within isolated browser memory without network transit.
Drag and drop your .ulaw file onto the working surface or use the system file dialog. File magic bytes are verified locally on device.
Select a quality preset (Lossless, Visually Lossless, Balanced, Smallest) or adjust advanced encoding switches in the options panel.
Click CONVERT to execute local WebAssembly compilation. Save the finished .wav directly to local storage, or stage it for chaining.
Prefer local shell scripting? Run this standard POSIX command on your machine to achieve equivalent transcoding without a web interface:
# Convert ULAW to WAV locally
ffmpeg -i input.ulaw -codec:a pcm_s16le output.wavWorking with files across multiple web pages? The official convrtr Chrome Extension adds native Side Panel docking, right-click context menu media extraction, and visible viewport capture. Powered by the same zero-upload client-side WebAssembly engine.
Compare 8-bit companded ITU-T G.711 telephony audio against uncompressed 16-bit linear PCM WAV. Bitrate, dynamic range, and browser playback analyzed.
Is WAV higher quality than FLAC? Compare audio fidelity, bit-for-bit accuracy, file size differences, and ID3/Vorbis tag metadata support.
An in-depth audio engineering comparison between WAV and MP3. Compare bitrates, file sizes, audio frequencies, and production workflows.
G.711 μ-law (.ulaw / .ulw) and A-law (.alaw / .alw) are international ITU-T telecommunications standards for digitizing human speech over telephone networks, ISDN, PBX hardware, Asterisk, and VoIP systems. They store raw, headerless 8-bit non-linear companded samples at 8,000 Hz.
Because raw .ulaw and .alaw files lack standard RIFF or AIFF containers, media players, smartphones, and DAWs cannot identify or play them. Wrapping and expanding them into standard 16-bit linear PCM WAV makes them playable on any device.
If the recording originated from North America, Japan, or an Asterisk PCMU trunk, select μ-law. If the recording originated in Europe, the UK, or the rest of the world, select A-law. Both expand to clean 16-bit linear PCM.
Never. All G.711 expansion and WAV compilation run 100% locally in your web browser memory using client-side TypeScript. Corporate call recordings, legal logs, and voicemails remain completely private on your computer.
ULAW Sound Stream / Module (ULAW) and Waveform Audio File Format (WAV) serve distinct roles across the digital workflow. Converting to WAV provides optimized compatibility, modern compression efficiency, or standardized playback across web browsers, operating systems, and media production environments.
The output format (WAV) is inherently lossless or supports lossless operation. Your original visual or audio fidelity is mathematically preserved without quantization artifacts.
Never. convrtr is architected with a strict zero-upload model. All processing, decoding, decompression, and encoding happen 100% locally on your machine using sandboxed WebAssembly and Web Workers. Your data never touches an external server, database, or analytics collector.
You can execute this conversion locally via command-line utilities such as ffmpeg, cwebp, or ImageMagick. For example: see the developer terminal recipe provided in the technical specifications dossier above. convrtr provides the identical local-first capability directly inside your browser without installing CLI packages.
Yes. You can drop multiple .ulaw files into the instrument to process them concurrently in browser Web Workers, or click 'Open in Master Studio' to queue mixed formats, configure individual targets, and export as a single ZIP archive.
Decode headerless 8-bit non-linear G.711 voice bitstreams from PBX, Asterisk, and VoIP call recordings into standard 16-bit linear PCM WAV without desktop software.
Learn how Adaptive Multi-Rate (AMR-NB and AMR-WB) speech codecs compress voice with ACELP and how convrtr synthesizes them into 16-bit linear PCM WAV without server uploads.