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AVI to MP4 API

Convert avi files to mp4 with a single POST request. Upload a file as multipart/form-data and the API returns a download URL for the converted file.

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Input

avi

Output

mp4 (video/mp4)

Credit cost

2 per file

Max file size

Per plan (10–500 MB)

Endpoint

POSThttps://api.fileswitch.co/api/v1/converter/avi-to-mp4

Authentication is optional for guests and recommended for production. Send either an API key or a JWT access token as a Bearer token. Authenticated requests deduct 2 credits from your balance; failed conversions are refunded. See Authentication for details.

Quick start

The same request in every supported language. Each example uploads a file and prints the downloadUrl from the response.

Example request
curl -X POST https://api.fileswitch.co/api/v1/converter/avi-to-mp4 \
  -H "Authorization: Bearer fc_YOUR_API_KEY" \
  -F "file=@input.avi" \
  -F "quality=medium" \
  -F "resolution=0" \
  -F "fps=0" \
  -F "audioBitrate=192k"

Parameters

Send file plus any optional options. Every option is optional and falls back to its default when omitted.

FieldTypeDefaultDescription
filebinary—The file to convert. Accepts .avi
qualitystringmedium

Encoding quality trade-off (higher quality = larger file).

Values: low, medium, high

resolutionstring0

Scale to this output height in pixels; 0 keeps the original resolution.

Values: 0, 2160, 1440, 1080, 720, 480, 360

fpsnumber0

Output frame rate; 0 keeps the source frame rate.

Range: 0 .. 60

audioBitratestring192k

Output audio bitrate.

Values: 320k, 256k, 192k, 128k, 96k, 64k

Example request bodyjson
{
  "file": "input.avi",
  "quality": "medium",
  "resolution": "0",
  "fps": 0,
  "audioBitrate": "192k"
}

Response

Every conversion endpoint returns the same success / message / data envelope. The data object is a Conversion record with a temporary downloadUrl.

Response bodyjson
{
  "success": true,
  "message": "Conversion completed",
  "data": {
    "id": "b10a5f2e-8c1e-4b3a-9c1d-2e3f4a5b6c7d",
    "inputFormat": "html",
    "outputFormat": "pdf",
    "inputFileName": "document.html",
    "outputFileName": "document.pdf",
    "inputFileSize": 45210,
    "outputFileSize": 88431,
    "status": "completed",
    "error": null,
    "creditCost": 2,
    "downloadUrl": "/api/v1/converter/download/conversions%2Fb10a5f2e-8c1e-4b3a-9c1d-2e3f4a5b6c7d%2Foutput.pdf",
    "createdAt": "2026-07-31T13:00:00.000Z",
    "completedAt": "2026-07-31T13:00:02.000Z"
  }
}

Prepend https://api.fileswitch.co/api/v1 to the downloadUrl and download with the same credentials. Files are retained temporarily and auto-deleted. See the full field reference in Response Schema.

Related conversions

MP4 to GIF

mp4 gif

MP4 to MP3

mp4 mp3

MP3 to WAV

mp3 wav

WAV to MP3

wav mp3

Ready to convert avi → mp4? Start free — no credit card required.

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