ChunkAudio

Introduction to ChunkAudio

ChunkAudio is a browser-based audio splitting tool designed to divide audio files into equal-length segments without uploading data to external servers. It operates entirely within the user's web browser using WebAssembly and the Web Audio API, ensuring that audio files remain on the local device at all times. The tool serves users who require simple, reliable, and privacy-preserving audio segmentation — including podcasters, educators, transcription professionals, language learners, researchers, and content creators.

It supports common audio formats including MP3, WAV, FLAC, M4A, OGG, and AAC, and offers three segmentation modes: fixed-duration chunks, fixed-number-of-segments division, and silence-aware splitting. No account creation, software installation, or payment is required, and the interface is optimized for immediate usability with minimal configuration.

Key Takeaways

• Processes audio entirely in-browser: no file uploads, no server-side handling, no data transmission
• Supports six input formats (MP3, WAV, FLAC, M4A, OGG, AAC) and outputs uncompressed WAV files
• Offers three split modes: by duration (e.g., 5 minutes), by segment count (e.g., 10 parts), or with smart silence detection
• Enables bulk download of all segments as individual files or a single ZIP archive
• Works offline after initial page load, supporting sensitive or confidential audio use cases
• No registration, tracking, watermarks, usage limits, or premium tiers
• Compatible across desktop and mobile browsers on Windows, macOS, Linux, and iOS/Android
• Handles large files (hundreds of MB) depending on device memory; performance scales with available RAM

How ChunkAudio Works

Users begin by uploading an audio file via drag-and-drop or file selection. Once loaded, the tool analyzes the file’s duration and metadata locally. The user then selects a splitting mode: entering a target chunk duration (e.g., 30 minutes), specifying a desired number of segments, or enabling silence detection to adjust split points near natural pauses. ChunkAudio processes the audio using the Web Audio API and WebAssembly modules, performing waveform analysis and precise sample-level slicing without transcoding or quality loss. All output files are generated as PCM WAV files to preserve fidelity and ensure broad compatibility.

The segmented files are made available for download either individually or collectively in a ZIP archive containing numbered, timestamped files (e.g., chunk-001.wav, chunk-002.wav). Because processing occurs client-side, the tool functions even after disconnecting from the internet once the application is loaded.

Core Benefits and Applications

ChunkAudio is widely used for transcription preparation, where services impose file-length limits (e.g., 15–30 minutes per upload); it enables compliant segmentation of long interviews, lectures, or meetings. Podcasters use it to repurpose full episodes into standardized social media clips (e.g., 60-second Instagram Stories or 3-minute TikTok segments). Audiobook creators apply it to divide recordings into uniform chapter lengths aligned with distribution platform requirements. Language educators split course materials into manageable study intervals, while musicians segment live recordings or DJ sets for track identification and editing. Researchers and medical or legal professionals benefit from its zero-upload architecture when handling sensitive audio, such as patient consultations or confidential interviews.