How to prepare an audio file before publication or upload?
Complete guide to prepare your audio files before publication: format, quality, metadata and optimization for each platform.
Try it now
Use our free online tool
Publishing an audio file online should not be taken lightly. Whether you're uploading music, a podcast, a soundtrack or an educational file, the preparation beforehand determines the quality of the experience for your listeners.
A poorly prepared file can be rejected by platforms, poorly played by some devices, or simply offer disappointing quality. Conversely, a well-optimized file loads quickly, sounds perfect, and integrates seamlessly into the distribution ecosystem.
This complete guide walks you through all the preparation steps: from format choice to final optimization, including metadata and quality control.
Table of Contents
Complete preparation workflow
Preparing an audio file for publication follows a 5-key step process, each crucial for the final result.
1. SOURCE VERIFICATION: Ensure the starting file is of the best possible quality. You can't improve a degraded file.
2. FORMAT CHOICE: Select the format, bitrate and technical parameters suited to the destination (Spotify, podcast, web, etc.).
3. AUDIO PROCESSING: Apply necessary treatments: loudness normalization, noise removal, fade addition.
4. METADATA: Correctly fill in file information: title, artist, album, artwork.
5. QUALITY CONTROL: Verify the final file through complete listening and technical analysis.
This workflow adapts according to context: a simple upload to SoundCloud will require fewer steps than professional distribution on Spotify.
Step 1: Source file verification
Before any manipulation, examine your source file. It's the foundation of everything that follows.
ORIGINAL QUALITY: Ideally, start from an uncompressed file (WAV, AIFF) or lossless (FLAC). If your source is an MP3, you cannot improve its quality by converting it.
SAMPLE RATE: Note the current frequency. 44.1 kHz is the standard, 48 kHz for video. Avoid unnecessary conversions.
BIT DEPTH: 24 bits offers more headroom for processing. 16 bits is acceptable if that's your source.
CRITICAL LISTENING: Listen to the file in its entirety. Spot defects: clicks, pops, background noise, distortion. This is the time to correct them.
LEVELS: Verify that peaks don't exceed 0 dB (clipping). If they do, you must correct at source.
DURATION AND TRIMMING: Ensure the file contains exactly what you want to publish, without excessive silence at beginning or end.
Step 2: Format and parameter choice
Export format depends entirely on your destination. Here are recommendations by platform:
SPOTIFY/APPLE MUSIC (via distributor): WAV or FLAC, 44.1 kHz, 16 or 24 bits. No compression at this stage.
SOUNDCLOUD: MP3 320 kbps or FLAC for Pro accounts. 44.1 kHz, stereo.
YOUTUBE: If in a video, let video encoding handle audio. For audio alone, high quality AAC or MP3.
PODCASTS: MP3 128-192 kbps, 44.1 kHz, mono or stereo depending on content.
WEBSITE: MP3 128-256 kbps depending on importance of quality vs file size.
ARCHIVING: FLAC or WAV, maximum quality, to keep a master version.
EMAIL/SHARING: MP3 128 kbps if size is critical, 256-320 kbps otherwise.
Step 3: Audio processing (if necessary)
Depending on your source file condition and destination requirements, some processing may be necessary.
LOUDNESS NORMALIZATION: Adjust integrated loudness to your platform's target (-14 LUFS for Spotify/YouTube, -16 LUFS for podcasts). Convertly Audio can display and adjust loudness.
TRUE PEAK LIMITING: Ensure peaks don't exceed -1 dB True Peak to avoid distortion after encoding.
NOISE REDUCTION: If the file contains background noise, apply subtle noise reduction. Too much reduction creates artifacts.
FADES: Add fade in/out for smooth transitions. Even 10-20 ms avoids clicks.
EQUALIZATION: Tonal correction if necessary, but avoid drastic changes at this stage.
DYNAMIC COMPRESSION: For podcasts, light compression evens voice levels. For music, this should be done at mastering.
DON'T: Over-process an already mastered file. If it's a professional master, it's probably ready.
Step 4: Metadata and artwork
Metadata is what listeners see in their players. Well-crafted metadata reflects your professionalism.
TITLE: The exact title of the track or episode. Check spelling and capitalization.
ARTIST: Your artist name or podcast name. Consistent with your other publications.
ALBUM: For music, the album name. For podcasts, the show name.
YEAR: The publication year (not creation, unless it's the same).
GENRE: Choose the most appropriate genre. Players use this info for recommendations.
TRACK NUMBER: For albums, track number ensures correct order.
ARTWORK: Cover image. Minimum 1400x1400 pixels for streaming services, JPEG or PNG. Apple recommends 3000x3000.
COPYRIGHT: Copyright information (©2024 Your Name, etc.).
ISRC/UPC: For commercial distribution, these codes are essential for royalties.
Step 5: Final quality control
Before publication, rigorous quality control avoids bad surprises.
FULL LISTENING: Listen to the EXPORTED file (not the project) from start to finish. Export problems often hide at the end.
MULTI-DEVICE LISTENING: Test on basic earbuds, speakers, and if possible in a car. That's how your audience will listen.
TECHNICAL VERIFICATION: Use Convertly Audio or MediaInfo to confirm parameters: format, bitrate, frequency, loudness.
METADATA VERIFICATION: Open the file in a player and verify that title, artist and artwork display correctly.
PLAYBACK TEST: Try playing the file on different devices and players to confirm compatibility.
FILE SIZE: Verify the size is reasonable for your use (no 500 MB file for a 30 min podcast).
A/B COMPARISON: If possible, compare your file to similar quality references on the same platform.
Publication checklist
✅ Source file verified (quality, no defects)
✅ Correct format for destination
✅ Appropriate bitrate (no over/under quality)
✅ Correct sample rate (44.1 or 48 kHz)
✅ Loudness normalized (-14 or -16 LUFS depending on platform)
✅ True Peak under -1 dB
✅ Fade in/out applied
✅ Complete and correct metadata
✅ Artwork embedded and high resolution
✅ Full listening of final file completed
✅ Test on multiple devices passed
✅ Reasonable file size
✅ Backup copy made
✅ Ready for publication!
Ready to try?
Try Convert audioHow to do it in 3 steps
Import your source file to Convertly Audio to analyze its characteristics and identify necessary adjustments.
Select the target format and parameters suited to your destination platform, then apply processing (loudness, fades).
Fill in metadata, download the final file, perform quality control then publish.
Pro Tips
- Create a project template with your standard settings for each type of publication.
- Always prepare multiple versions (high quality for distribution, optimized for web, etc.) in a single session.
- Keep a log of your publications with parameters used for future reference.
Common mistakes to avoid
- ✗Starting from a compressed source file (MP3 128 kbps) for professional distribution. Solution: always keep high quality source files.
- ✗Forgetting to check loudness and having sound too quiet or too loud. Solution: normalize to -14 LUFS for streaming.
- ✗Not listening to exported file and publishing a file with a glitch. Solution: ALWAYS listen before publication.
- ✗Inconsistent metadata across platforms. Solution: prepare metadata once and apply everywhere.
- ✗Low resolution artwork that pixelates on large screens. Solution: use minimum 3000x3000 pixels.
- ✗Publishing without backup and losing original file. Solution: systematically archive before publication.