Professional Audio Studio in Your Browser
Our versatile online audio converter provides comprehensive support for a wide range of formats, including MP3, WAV, FLAC, OGG, and AAC. This ensures seamless compatibility across various devices and platforms for all your audio needs. Quickly convert music, podcasts, or voice recordings while maintaining optimal sound quality, perfect for both personal and professional use.
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Supports MP3, WAV, FLAC, OGG, AAC, M4A, WebM - Max 100MB (Pro: 500MB)
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Conversion Options
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Convert in 4 Simple Steps
No software installation required. Fast online audio conversion.
Upload File
Drag & drop or click to select your audio file
Choose Format
Select output format: MP3, WAV, FLAC, and more
Set Quality
Pick from High, Medium, or Low quality presets
Download
Get your converted file instantly
Audio Converter (Online)
Convert audio formats in a few clicks—no software installs. Choose the output format (MP3, WAV, M4A/AAC, FLAC), select a quality preset, and download the converted file.
Bitrate (quality vs size)
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- Voice / meetings: 64–128 kbps usually sounds clear
- Music: 192–320 kbps is safer for detail
- If you are unsure: start with 128 kbps for voice, 192 kbps for music
Sample rate (most users should keep it)
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- 44.1 kHz: common for music
- 48 kHz: common for video/recording
- If you do not have a specific need, keep the original sample rate.
Troubleshooting
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- No sound after conversion: the source file may have multiple tracks or a codec issue—try another output format (AAC/MP3).
- File will not open: redownload, or convert again using a different preset.
- Upload stuck: try a smaller clip or switch networks.
Privacy & Security
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To process your file, FastlyConvert temporarily uploads it to our servers, converts it, and then automatically deletes it within 24 hours. Transfers use HTTPS encryption. We do not sell your files or use them to build public datasets. If you need immediate deletion assistance, contact us at support@fastlyconvert.com.
Quick FAQs
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- MP3 or AAC—what is better? AAC often keeps quality at smaller sizes; MP3 has the broadest compatibility.
- WAV is huge—is that normal? Yes, WAV is uncompressed; use FLAC or AAC for smaller files.
- Will metadata be kept? Some metadata may be removed during conversion depending on the format.
Powerful Audio Conversion
Convert between all major audio formats with professional quality settings.
Studio-Grade Audio Quality
Professional-grade output with 8+ format support. From lossless FLAC to compressed MP3, get the quality you need with customizable bitrate presets.
- check_circleMP3, WAV, FLAC, OGG, AAC, M4A
- check_circleUp to 320kbps lossless quality
Convert Hours of Audio in Seconds
Powered by FFmpeg, the industry-standard engine. Convert large files in seconds, not minutes. Your files stay private with auto-deletion within 24 hours.
- check_circleFFmpeg professional engine
- check_circleEncrypted + auto-delete
100% Browser-Based. Zero Installation.
No downloads, no plugins, no hassle. Works instantly on any device — Windows, Mac, Linux, iOS, or Android. Just open and convert.
- check_circleWorks on any device
- check_circleNo registration required
Format Specs at a Glance
Understanding audio formats is essential for choosing the right one for your needs. Here's everything you need to know about each format we support.
Audio Format Comparison
| Format | Type | Quality | File Size | Best For |
|---|---|---|---|---|
| MP3 | Lossy | Good (up to 320kbps) | Small | Music Podcasts General |
| WAV | Lossless | Excellent (uncompressed) | Very Large | Pro Editing Archiving |
| FLAC | Lossless | Excellent (compressed) | Medium-Large | Hi-Fi Audiophile |
| OGG | Lossy | Very Good | Small | Games Streaming Open Source |
| AAC | Lossy | Very Good | Small | Apple YouTube Streaming |
| M4A | Hybrid | Very Good | Small | iTunes Apple Music Podcasts |
| WebM | Lossy | Good | Small | Web HTML5 |
| Opus | Lossy | Excellent | Very Small | VoIP Streaming Low-BW |
MP3 - The Universal Standard
MP3 (MPEG Audio Layer III) revolutionized digital audio in the 1990s and remains the most widely supported format. It uses perceptual coding to remove audio frequencies that humans can't easily hear, achieving compression ratios of 10:1 or better while maintaining good quality.
- Universal compatibility
- Small file sizes
- Some quality loss at lower bitrates
WAV - Uncompressed Excellence
WAV (Waveform Audio File Format) stores audio in its raw, uncompressed form. This means zero quality loss, making it ideal for professional audio production and archiving. The trade-off is significantly larger file sizes compared to compressed formats.
- Perfect audio quality
- Best for editing
- Very large file sizes
FLAC - Lossless Compression
FLAC (Free Lossless Audio Codec) offers the best of both worlds: perfect audio quality with file sizes 50-70% smaller than WAV. It's the preferred format for audiophiles and music collectors who want to preserve original quality while saving storage space.
- Lossless quality
- Open-source format
- Limited device support
Opus - Modern Efficiency
Opus is a cutting-edge audio codec designed for the internet age. It delivers exceptional quality at very low bitrates, making it perfect for real-time communication and streaming. At similar file sizes, Opus typically outperforms both MP3 and AAC in quality.
- Best quality-to-size ratio
- Low latency streaming
- Newer format, less compatible
Find the Perfect Format for Your Needs
Different situations call for different audio formats. Here's a guide to help you make the right choice.
Podcasts & Voice Content
For spoken word content, smaller file sizes are more important than maximum audio quality.
Why: Voice doesn't need high bitrates to sound clear
Music Collection
For music lovers who want to preserve quality while keeping files manageable.
Why: Balance between quality and storage space
Professional Audio Production
When you need to edit audio or maintain master-quality recordings.
Why: Lossless formats preserve all audio data for editing
Mobile Devices
For storing music on phones and portable players with limited storage.
Why: Universal compatibility and good compression
Web & Streaming
For embedding audio on websites or streaming platforms.
Why: Optimized for web delivery and low bandwidth
Game Development
For game audio, sound effects, and background music.
Why: Open formats with good quality and small size
Understanding Audio Quality: Bitrate Explained
Bitrate measures how much data is used to store each second of audio, expressed in kilobits per second (kbps). Higher bitrates generally mean better quality but larger files.
Pro Tip
When converting from a lossy format (like MP3) to another lossy format, quality can degrade. If possible, always convert from the original source or a lossless format like FLAC or WAV.
Frequently Asked Questions
What audio formats can I convert?
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FastlyConvert supports converting between MP3, WAV, FLAC, OGG, AAC, M4A, WebM, and Opus audio formats.
Is there a file size limit?
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Free users can convert audio files up to 100MB. Pro users can convert files up to 500MB.
Can I convert video to audio?
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Yes! You can upload video files (MP4, MOV, AVI, MKV) and extract the audio track to your preferred audio format.
Is the audio quality preserved?
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Yes. We offer high quality (320kbps), medium quality (192kbps), and low quality (128kbps) options. Lossless formats like FLAC preserve full audio quality.
What's the best free audio converter online?
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FastlyConvert offers professional audio conversion with support for 8+ formats, customizable quality settings, fast processing, and secure file handling. It's completely free for up to 100MB files with no registration required.
Does FastlyConvert support batch audio conversion?
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Currently, FastlyConvert processes one audio file at a time to ensure optimal quality and speed. Pro users get priority processing for faster conversions.
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Audio Format Conversion Guide: MP3, WAV, FLAC and More
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