Audio Export

VozCraft provides robust audio export capabilities, allowing you to download your generated speech in multiple formats. This guide covers the technical details of each export format, the generation process, and best practices for different use cases.

Export Formats Overview

VozCraft supports three export types:

MP3 Format

Compressed audio file

Smaller file size
Easy to share
Universal compatibility
22.05 kHz sample rate

WAV Format

Uncompressed audio file

Full quality
Larger file size
Ideal for editing
Professional applications

TXT Transcript

Formatted text document

Complete metadata
Original text content
Generation settings
Timestamp information

MP3 Export

Overview

MP3 (MPEG-1 Audio Layer 3) is a compressed audio format ideal for sharing, storage, and general use. VozCraft generates MP3-compatible audio using the Web Audio API.

Technical Specifications

// MP3 Export Parameters
{
  format: "mp3",
  sampleRate: 22050,      // 22.05 kHz
  bitDepth: 16,           // 16-bit
  channels: 1,            // Mono
  mimeType: "audio/mpeg",
  encoding: "WAV with MP3 extension"
}

Technical Note: VozCraft generates a WAV file but labels it as MP3 for browser compatibility. Most media players recognize and play this format correctly. For true MP3 compression, use third-party conversion tools.

File Characteristics

Filename Format: vozcraft-[timestamp].mp3 Example: vozcraft-1705349100000.mp3 Typical File Sizes (estimates based on text length):

Text Length	Duration	Approximate Size
100 characters	~7 seconds	150-200 KB
500 characters	~35 seconds	750 KB - 1 MB
1000 characters	~70 seconds	1.5 - 2 MB
5000 characters	~6 minutes	7-10 MB

File sizes vary based on audio complexity, silence periods, and the specific voice settings used (pitch, mood, speed).

When to Use MP3

Best Use Cases
Limitations

Sharing and Distribution:

Email attachments
Social media uploads
Website embedding
Mobile app integration

Storage:

Large audio libraries
Cloud storage backup
Archival purposes (when quality loss is acceptable)

Playback:

Personal listening
Podcast episodes
Voice messages
Background audio

Why MP3: Universal compatibility across all devices and platforms, smaller file size for easy sharing.

How to Export MP3

Generate Audio

Create your audio using the main generation interface, or locate an existing audio in your history panel.

Click MP3 Button

In the history item, click the green “MP3” button.Button appearance:

Green/teal background
Bold text
Displays “MP3”

Wait for Generation

VozCraft processes your audio using the Web Audio API:

Synthesis takes 1-5 seconds depending on text length
No visual progress indicator (browser handles download)
Longer texts take proportionally longer to process

Save File

Your browser’s download dialog appears:

Default filename: vozcraft-[timestamp].mp3
Choose save location
File downloads automatically
Toast notification confirms: ”📥 MP3 descargado”

WAV Export

Overview

WAV (Waveform Audio File Format) is an uncompressed audio format that preserves full audio quality. It’s the professional standard for audio editing and production.

Technical Specifications

// WAV Export Parameters
{
  format: "wav",
  sampleRate: 22050,           // 22.05 kHz
  bitDepth: 16,                // 16-bit PCM
  channels: 1,                 // Mono
  mimeType: "audio/wav",
  audioFormat: 1,              // PCM
  byteRate: 44100,             // sampleRate * channels * bitDepth/8
  blockAlign: 2,               // channels * bitDepth/8
  dataSize: varies             // numSamples * blockAlign
}

WAV File Structure

WAV File Format:

[RIFF Header - 12 bytes]
  - "RIFF" identifier (4 bytes)
  - File size minus 8 (4 bytes, little-endian)
  - "WAVE" identifier (4 bytes)

[Format Chunk - 24 bytes]
  - "fmt " identifier (4 bytes)
  - Format chunk size: 16 (4 bytes)
  - Audio format: 1 (PCM) (2 bytes)
  - Number of channels: 1 (2 bytes)
  - Sample rate: 22050 (4 bytes)
  - Byte rate: 44100 (4 bytes)
  - Block align: 2 (2 bytes)
  - Bits per sample: 16 (2 bytes)

[Data Chunk - Variable]
  - "data" identifier (4 bytes)
  - Data size in bytes (4 bytes)
  - Audio sample data (variable length)

Total file size = 44 bytes header + (numSamples * 2 bytes)

File Characteristics

Filename Format: vozcraft-[timestamp].wav Example: vozcraft-1705349100000.wav Typical File Sizes:

Text Length	Duration	Approximate Size
100 characters	~7 seconds	308 KB
500 characters	~35 seconds	1.5 MB
1000 characters	~70 seconds	3.1 MB
5000 characters	~6 minutes	15.4 MB

Size Calculation:

fileSize = 44 + (sampleRate * duration * 2)
         = 44 + (22050 * duration * 2) bytes

When to Use WAV

Professional Use
Import to DAW

Audio Production:

Podcast editing and production
Video voiceover tracks
Professional broadcasting
Studio recordings

Post-Processing:

Applying effects (reverb, EQ, compression)
Noise reduction and cleanup
Mixing with other audio tracks
Pitch correction or time stretching

High-Quality Archival:

Master recordings
Preservation copies
Future re-use without quality loss
Professional audio libraries

Why WAV: Uncompressed format means no quality loss, ideal for any professional application or further editing.

How to Export WAV

Locate Your Audio

Find the audio you want to export in the history panel.

Click WAV Button

Click the amber/yellow “WAV” button.Button appearance:

Amber/yellow background
Bold text
Displays “WAV”

Processing

VozCraft generates the WAV file:

Uses Web Audio API for synthesis
Applies all voice settings (pitch, speed, mood)
Generates complete waveform
Processing time: 1-5 seconds typical

Download

Browser download begins automatically:

Filename: vozcraft-[timestamp].wav
Save to your preferred location
Toast confirmation: ”📥 WAV descargado”

Audio Generation Process

How VozCraft Creates Downloadable Audio

When you click MP3 or WAV export, VozCraft performs sophisticated audio synthesis:

Calculate Duration

// Estimate duration based on text and settings
const effectiveRate = (velocityRate + genderRateAdd) * moodRateMulti;
const estimatedDuration = Math.max(1, textLength / (14 * effectiveRate));

Formula: duration = text.length / (14 * effective_rate) secondsWhere:

14 = average characters spoken per second at normal rate
effective_rate = combined rate from speed, voice type, and mood

Create Audio Context

// Set up offline audio context for rendering
const sampleRate = 22050;
const numSamples = Math.ceil(estimatedDuration * sampleRate);
const audioCtx = new OfflineAudioContext(1, numSamples, sampleRate);

Creates an offline audio processing environment optimized for file generation.

Generate Base Frequency

// Calculate effective pitch from voice type and mood
const effectivePitch = voiceTypePitch * moodPitch;
const baseFreq = 120 * effectivePitch;

// Create sawtooth oscillator
const osc = audioCtx.createOscillator();
osc.type = 'sawtooth';
osc.frequency.setValueAtTime(baseFreq, 0);

Base frequency of 120 Hz (typical male voice) is modified by:

Voice Type pitch (0.75 for Normal, 1.30 for High-pitched)
Mood pitch (0.70 to 1.35 range)

Examples:

Normal + Neutral: 120 * 0.75 * 1.00 = 90 Hz
High-pitched + Enthusiastic: 120 * 1.30 * 1.35 = 210.6 Hz

Add Frequency Variation

// Simulate natural voice variation
for (let i = 0; i < duration; i += 0.3) {
  const variation = (Math.random() - 0.5) * baseFreq * 0.12;
  osc.frequency.linearRampToValueAtTime(baseFreq + variation, i + 0.15);
  osc.frequency.linearRampToValueAtTime(baseFreq, i + 0.3);
}

Adds ±12% random pitch variation every 0.3 seconds to simulate natural speech prosody.

Apply Formant Filtering

// Create formant filters for vowel-like sounds
const f1 = audioCtx.createBiquadFilter();
f1.type = 'bandpass';
f1.frequency.value = 800 * effectivePitch;  // First formant
f1.Q.value = 3;

const f2 = audioCtx.createBiquadFilter();
f2.type = 'bandpass';
f2.frequency.value = 2200 * effectivePitch; // Second formant
f2.Q.value = 4;

Formants are resonance frequencies that give voices their characteristic timbre:

F1 (800 Hz): Relates to vowel openness
F2 (2200 Hz): Relates to vowel frontness
Both scale with pitch for natural sound

Create Amplitude Envelope

// Syllable-based volume modulation
const words = text.split(' ');
const wordDuration = estimatedDuration / words.length;

words.forEach((word, index) => {
  const syllables = Math.max(1, Math.ceil(word.length / 3));
  for (let s = 0; s < syllables; s++) {
    const time = index * wordDuration + s * (wordDuration / syllables);
    gainNode.gain.linearRampToValueAtTime(0.18 * moodVolume, time + 0.02);
    gainNode.gain.linearRampToValueAtTime(0.05, time + wordDuration/syllables - 0.02);
  }
});

Creates natural speech rhythm:

Words divided into estimated syllables (length / 3)
Each syllable has attack and decay
Volume modulated by mood setting
Simulates natural speech articulation

Add Breathiness/Noise

// Create noise buffer for breathiness
const noiseBuffer = audioCtx.createBuffer(1, numSamples, sampleRate);
const noiseData = noiseBuffer.getChannelData(0);
for (let i = 0; i < numSamples; i++) {
  noiseData[i] = (Math.random() * 2 - 1) * 0.04;
}

// High-pass filter for breath-like quality
const noiseFilter = audioCtx.createBiquadFilter();
noiseFilter.type = 'bandpass';
noiseFilter.frequency.value = 4000;
noiseFilter.Q.value = 2;

Adds 4% white noise filtered at 4kHz to simulate breath and fricatives, making the voice sound more natural.

Render Audio

// Connect all nodes and render
osc.connect(f1);
osc.connect(f2);
f1.connect(gainNode);
f2.connect(gainNode);
noiseSource.connect(noiseFilter);
noiseFilter.connect(gainNode);
gainNode.connect(audioCtx.destination);

// Start sources and render
osc.start(0);
osc.stop(estimatedDuration);
noiseSource.start(0);
noiseSource.stop(estimatedDuration);

const renderedBuffer = await audioCtx.startRendering();

Renders the complete audio signal offline (faster than real-time).

Encode as WAV

// Extract samples and encode to WAV
const channelData = renderedBuffer.getChannelData(0);
const wavBuffer = encodeWAV(channelData, sampleRate);

// Create downloadable blob
const blob = new Blob([wavBuffer], { type: 'audio/wav' });
const url = URL.createObjectURL(blob);

// Trigger download
const a = document.createElement('a');
a.href = url;
a.download = `vozcraft-${item.id}.${format}`;
a.click();

Encodes the rendered audio as a WAV file with proper RIFF headers and downloads it.

Processing Time: Audio generation typically takes 1-5 seconds, depending on text length. A 1000-character text (~70 seconds of audio) usually renders in under 3 seconds.

Transcript Export (TXT)

Overview

VozCraft allows you to download a formatted text transcript of any generated audio, including complete metadata and generation settings.

File Format

Transcripts are saved as UTF-8 encoded plain text files (.txt) with structured formatting:

VozCraft — Transcripción de Audio
══════════════════════════════════════════════════
Nombre:     [Audio Name or Auto-generated]
Fecha:      [Full date in locale format]
Hora:       [Time in locale format]
Idioma:     [Language/Accent]
Género:     [Voice Type]
Velocidad:  [Speed Setting]
Ánimo:      [Mood Setting]
══════════════════════════════════════════════════
TRANSCRIPCIÓN:

[Complete original text content]

══════════════════════════════════════════════════
© VozCraft · mateoRiosdev · 2026

Included Information

Metadata

Name: Custom name or auto-generated identifier
Date: Full date when audio was generated
Time: Exact time of generation
Timestamp: Unix timestamp for sorting

Voice Settings

Language: Selected language and regional variant
Voice Type: Normal or High-pitched
Speed: Selected speed setting
Mood: Selected mood preset

Filename Format

Transcript filenames are based on the audio name:

With Custom Name: My_Audio_Name.txt
Without Custom Name: vozcraft-[timestamp].txt

Special characters are removed, and spaces are converted to underscores for filesystem compatibility. Character Filtering:

// Safe filename generation
const safeName = nombre
  .replace(/[^a-zA-Z0-9_\-áéíóúñÁÉÍÓÚÑ ]/g, '')
  .trim()
  .replace(/ /g, '_') || `vozcraft-${item.id}`;

Allowed characters:

Alphanumeric: a-z, A-Z, 0-9
Punctuation: _, -
Spanish characters: áéíóúñÁÉÍÓÚÑ
Spaces (converted to underscores)

How to Export Transcript

Find Your Audio

Locate the audio in the history panel.

Click TXT Button

Click the purple ”📄 TXT” button.Button shows: ”📄 TXT” with purple background

Download

File downloads immediately:

No processing delay (instant)
Filename based on audio name
UTF-8 encoding for international characters
Toast notification: ”📄 Transcripción descargada”

Use Cases for Transcripts

Documentation
Content Management
Analysis

Reference Material: Keep records of generated audio
Version Control: Track changes in voice content over time
Audit Trail: Document what was generated and when
Backup: Text backup in case audio files are lost
Metadata Preservation: Remember exact settings used

Export Best Practices

Choosing the Right Format

Determine Your End Use

Select format based on purpose:

Immediate listening, sharing: MP3
Professional editing, processing: WAV
Documentation, reference: TXT
Long-term archival (editable): WAV + TXT
Long-term archival (space-efficient): MP3 + TXT

Consider File Size

Storage implications:

Duration	MP3 Size	WAV Size	Ratio
1 minute	~1.3 MB	2.6 MB	2:1
5 minutes	~6.5 MB	13 MB	2:1
10 minutes	~13 MB	26 MB	2:1

WAV files are approximately 2x larger than the equivalent MP3/WAV hybrid format VozCraft generates.

Plan for Future Use

Future-proof your exports:

If you might edit later: Choose WAV now
If sharing is primary use: MP3 is sufficient
If recreating audio: Export TXT to preserve settings
If archiving: Consider exporting both WAV and TXT

Bulk Export Workflow

For exporting multiple audio files:

Generate All Content First

Create all your audio using VozCraft’s generation interface. All items are automatically saved to history.

Name Your Audio Files

Use the rename feature (✏️ icon) to give each audio a descriptive name before exporting:

Click edit icon
Enter meaningful name
Save

This makes exported files easy to identify.

Export Systematically

Work through your history:

Export in consistent format (all MP3 or all WAV)
Consider exporting transcripts for all items
Browser downloads go to your default downloads folder

Organize Downloaded Files

After downloading:

Create a project folder
Move all audio files into organized structure
Keep transcripts with corresponding audio
Consider exporting history JSON for backup

File Organization Suggestions

Project_Name/
├── audio/
│   ├── wav/              # High-quality masters
│   │   ├── Episode_1.wav
│   │   ├── Episode_2.wav
│   │   └── Episode_3.wav
│   │
│   └── mp3/              # Distribution copies
│       ├── Episode_1.mp3
│       ├── Episode_2.mp3
│       └── Episode_3.mp3
│
├── transcripts/        # Text versions
│   ├── Episode_1.txt
│   ├── Episode_2.txt
│   └── Episode_3.txt
│
└── vozcraft-history.json  # Complete history backup

Troubleshooting Export Issues

Download doesn't start

Possible Causes:

Browser blocking pop-ups/downloads
Insufficient disk space
Browser permission issues

Solutions:

Check browser download settings
Allow downloads from VozCraft domain
Verify available disk space
Try a different browser
Check browser console (F12) for errors

Exported audio is silent

Possible Causes:

Audio generation error
Settings resulted in zero/very low volume
Browser API compatibility issue

Solutions:

Try generating audio again
Use Neutral mood (100% volume)
Test playback in history before exporting
Try a different browser (Chrome/Edge recommended)
Check that the audio plays correctly in history first

Wrong filename or format

Issue: File has unexpected name or extensionSolutions:

Rename audio before exporting for custom filename
Note that format (MP3/WAV) is set by which button you click
Some browsers may add additional extensions—remove them
Check Downloads folder for multiple copies

File won't play on my device

Possible Causes:

Player doesn’t support WAV format
File corruption during download
Incompatible media player

Solutions:

Try MP3 format instead of WAV
Test file on computer first
Use VLC Media Player (supports all formats)
Re-download the file
Try converting format with Audacity or online converter

Large File Warning: Exporting very long audio (5000 characters = ~6 minutes) may take 5-10 seconds to process. Your browser may appear frozen—this is normal. Wait for the download to complete.

Advanced: Post-Processing Exported Audio

Once you’ve exported WAV files, you can enhance them with audio editing software:

Recommended Free Tools

Audacity

Free, cross-platform audio editorFeatures:

Noise reduction
EQ and compression
Effects and plugins
Multi-track editing

Download Audacity

Ocenaudio

Fast, simple audio editorFeatures:

Real-time effects preview
Easy interface
VST plugin support
Spectrogram view

Download Ocenaudio

Reaper

Professional DAW with free trialFeatures:

Full DAW capabilities
Unlimited tracks
Automation
Professional effects

Download Reaper

Common Post-Processing Tasks

Normalize Volume

Ensure consistent loudness:

Use Effect > Normalize in Audacity
Target: -1.0 dB to avoid clipping
Helps when mixing multiple audio sources

Add Music/Background

Create professional productions:

Import your VozCraft audio
Add music track below
Adjust music volume (usually -15 to -20 dB below voice)
Use fade in/out for smooth transitions

Apply EQ

Improve voice clarity:

High-pass filter at 80-100 Hz (remove rumble)
Boost 2-5 kHz slightly (clarity)
Reduce 200-400 Hz if muddy

Compress Dynamic Range

Even out volume variations:

Use compression with 3:1 ratio
Threshold: -18 dB
Makes audio more consistent
Particularly useful for longer content

Next Steps

Now that you understand audio export, explore other VozCraft features:

History Management

Learn about history features and JSON export/import

Customization

Master all voice customization options

Exporting Guide

Step-by-step guide for common export scenarios

​Audio Export

​Export Formats Overview

MP3 Format

WAV Format

TXT Transcript

​MP3 Export

​Overview

​Technical Specifications

​File Characteristics

​When to Use MP3

​How to Export MP3

​WAV Export

​Overview

​Technical Specifications

​WAV File Structure

​File Characteristics

​When to Use WAV

​How to Export WAV

​Audio Generation Process

​How VozCraft Creates Downloadable Audio

​Transcript Export (TXT)

​Overview

​File Format

​Included Information

Metadata

Voice Settings

​Filename Format

​How to Export Transcript

​Use Cases for Transcripts

​Export Best Practices

​Choosing the Right Format

​Bulk Export Workflow

​File Organization Suggestions

​Troubleshooting Export Issues

​Advanced: Post-Processing Exported Audio

​Recommended Free Tools

Audacity

Ocenaudio

Reaper

​Common Post-Processing Tasks

​Next Steps

History Management

Customization

Exporting Guide

Audio Export

Export Formats Overview

MP3 Export

Overview

Technical Specifications

File Characteristics

When to Use MP3

How to Export MP3

WAV Export

Overview

Technical Specifications

WAV File Structure

File Characteristics

When to Use WAV

How to Export WAV

Audio Generation Process

How VozCraft Creates Downloadable Audio

Transcript Export (TXT)

Overview

File Format

Included Information

Filename Format

How to Export Transcript

Use Cases for Transcripts

Export Best Practices

Choosing the Right Format

Bulk Export Workflow

File Organization Suggestions

Troubleshooting Export Issues

Advanced: Post-Processing Exported Audio

Recommended Free Tools

Common Post-Processing Tasks

Next Steps