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Uploading an Existing Audio File

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When to Use Upload Instead of the Microphone?

File upload is useful when: - You have a recording studio or an external professional microphone - You recorded your audio with a dedicated app (smartphone, portable recorder) - You want to edit the audio before submitting (trim silences, normalize volume) - You prefer to record several items in succession offline, then upload later

Accepted Formats

Format Extension Notes
MP3 .mp3 Recommended — optimal compression for voice
WAV .wav High quality, larger file size
WebM .webm Native format for browser recordings
OGG .ogg Open source format
M4A .m4a Apple format, native on iPhone
FLAC .flac Lossless, very large file size

Maximum file size: 50 MB

Automatic Processing

Good news! Regardless of the format submitted, the app automatically processes the audio:

Operation Parameter Benefit
Conversion → MP3 Universal format for all browsers
Compression 96 kbps Optimal quality for the human voice
Channels Mono (1 channel) File size reduced by ×2
Normalization Volume normalized Consistency across recordings

You don't need to do anything — the app handles optimization automatically.

Upload Procedure

Step 1: Open the Recording Modal

  1. Click 🎤 "Record" or ✏️ "Re-record" on the desired item
  2. The modal opens with the "Record" tab active by default

Step 2: Switch to the "Upload" Tab

  1. In the modal, click the "Upload" tab

Step 3: Select Your File

Option A — Click: 1. Click "Choose a file" 2. The file explorer opens 3. Navigate to your audio file 4. Click "Open"

Option B — Drag and drop: 1. Drag your file from the file explorer 2. Drop it in the modal's drop zone

The name of the selected file is displayed in the modal.

Step 4: Verify the Audio

  1. Click "Listen" 🔊
  2. Verify it is the correct recording (correct word, correct phrase)
  3. Check the quality (volume, clarity, absence of noise)

Step 5: Submit

  1. Click "Submit recording"
  2. A loading animation appears during upload and processing
  3. Success message: "Recording submitted successfully!"
  4. The modal closes automatically
  5. The item is marked ✅ Done

Processing Time

FFmpeg processing on the server side typically takes 2–10 seconds depending on the file size and server load. The loading animation indicates that processing is underway.

Possible Upload Errors

Error message Cause Solution
"File too large (max 50 MB)" File > 50 MB Compress the audio before submitting
"Unsupported format" Unrecognized extension Use MP3, WAV, WebM, OGG, M4A, or FLAC
"Corrupted file" Damaged file Re-record or convert with another tool
"Network error" Connection lost during upload Check connection and try again
"Processing error" FFmpeg problem Try again or use a different file/format

Tips for Uploaded Files

  1. MP3 at 128 kbps minimum before uploading (compression to 96 kbps is applied server-side)
  2. Avoid WAV files > 10 MB: they work but processing takes longer
  3. Clear naming: name your files locally before uploading to stay organized (e.g., card1-pos1.mp3)
  4. One file = one item: each item in the interface corresponds to one audio file

Next Steps