Audio Merger

An Online Audio Merger is a digital tool designed to combine multiple individual audio files (such as MP3, WAV, OGG, M4A, etc.) into a single, continuous audio track. This functionality is incredibly useful for creating song medleys, joining podcast segments, combining voice notes, assembling parts of an audiobook, or any scenario where you need to concatenate audio clips.

Zenfied's Audio Merger prioritizes ease of use, speed, and most importantly, your privacy and security. The entire merging process happens directly within your web browser (client-side). This means your audio files are never uploaded to our servers, ensuring your data remains confidential and the operation is fast, utilizing your own computer's processing capabilities.

1. Add Your Audio Files: Drag and drop your audio files (e.g., MP3, WAV) onto the designated upload area, or click the area to browse and select files from your computer. You can add multiple audio files.
2. Arrange Audio Files: After uploading, you'll see a representation of your audio files. You can reorder them by dragging and dropping them into your desired sequence. The files will be merged in the order they are listed.
3. Merge Audio & Preview: Once your files are in order, click the "Merge Audio!" button. The tool will process the files and generate a preview of the merged audio, which you can listen to.
4. Proceed to Download: If you're satisfied with the preview, click the "Proceed to Download" button. This will take you to the final download step.
5. Download Merged Audio: On the final screen, you can listen to the merged audio again and view details like total duration and file size. Click the "Download Merged Audio" button to save the combined audio file (e.g., `zenfied-merged-audio.wav`) to your device.
6. Clear or Start Over: Use the "Clear All" button to remove all uploaded files and start fresh. If you're on the preview or download screen, you can use "Change Audios" to go back and modify your selection, or "Merge Another Set" to begin a new merge operation.

• Secure & Private: All audio processing is done client-side. Your files are never uploaded to any server, ensuring complete privacy.
• Client-Side Processing: Utilizes your device's CPU and the Web Audio API for fast audio merging directly in your browser.
• Easy Drag & Drop: Simple and intuitive interface for adding and arranging audio files.
• Supports Common Audio Formats: Works with popular input audio formats like MP3, WAV, OGG, M4A, and more (browser dependent for decoding).
• Reorder Tracks: Easily arrange the sequence of your audio files before merging using drag and drop.
• Audio Preview: Listen to a preview of the merged audio before committing to the final download.
• WAV Output: The merged audio is provided in the high-quality, uncompressed WAV format.
• Completely Free: Merge your audio files without hidden costs, subscriptions, or limitations.
• No Installation Required: Works directly in modern web browsers (Chrome, Firefox, Edge, Safari).
• Direct Audio Download: Get your final merged audio as a single WAV file.

Our Audio Merger leverages the powerful Web Audio API built into modern web browsers, along with JavaScript, to perform all processing directly on your computer (client-side).

Here's a simplified explanation of the technical steps involved:

1. File Loading & Decoding: When you add audio files, the browser reads their binary data. The Web Audio API's `decodeAudioData` function is then used to convert each raw audio file into an `AudioBuffer`. An `AudioBuffer` represents the actual decoded sound waves (PCM data) in memory.
2. Compatibility Check (Implicit): The current implementation requires files to have the same sample rate and number of channels for successful merging. If files differ, an error is typically shown.
3. Buffer Concatenation: A new, empty `AudioBuffer` is created in the browser's memory. The total length of this new buffer is calculated to be the sum of the lengths of all the individual `AudioBuffer`s you've uploaded. The number of channels and sample rate are taken from the first successfully decoded buffer.
4. Data Copying: The script then sequentially copies the raw PCM data from each of your decoded `AudioBuffer`s into this new, larger `AudioBuffer`, one after the other, in the order you specified.
5. Encoding to WAV: Finally, this combined `AudioBuffer` (containing all the merged audio data) is encoded into the WAV (Waveform Audio File Format). This involves creating the WAV file header (specifying format, sample rate, channels, bit depth, etc.) and then writing the PCM data. The result is a `Blob` object representing the WAV file.
6. Download Prompt: An object URL is created for this WAV `Blob`, which then allows you to download the final merged audio file directly from your browser.

Because all these complex operations—decoding, concatenating, and encoding—happen entirely on your local machine, your original audio files and the final merged track never leave your device until you explicitly download the result. This ensures both speed and complete privacy.

• Create Song Medleys & Mixes: Seamlessly combine your favorite song clips or different tracks into a continuous mix.
• Join Podcast Segments: Easily assemble different parts of a podcast, such as intros, main content, advertisements, and outros.
• Combine Voice Memos: Merge multiple short voice recordings or notes into a single, organized audio file.
• Assemble Audiobooks: Join chapters of an audiobook that are in separate files into one playable track.
• Create Custom Ringtones/Alerts: Merge different sound effects or music snippets for unique phone sounds.
• Compile Audio for Presentations: Combine background music, voiceovers, and sound effects for a presentation.
• Simplify Sharing & Playback: Send or manage one combined audio file instead of many small ones, making it easier for listeners.
• Streamline Audio Editing Workflow: Combine raw takes or segments before further detailed editing.