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BMP to PNG API

Convert bmp files to png 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

bmp

Output

png (image/png)

Credit cost

1 per file

Max file size

Per plan (10–500 MB)

Endpoint

POSThttps://api.fileswitch.co/api/v1/converter/bmp-to-png

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 1 credit 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/bmp-to-png \
  -H "Authorization: Bearer fc_YOUR_API_KEY" \
  -F "file=@input.bmp" \
  -F "width=0" \
  -F "height=0"

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 .bmp
widthnumber0

Output width in pixels; 0 keeps the original width.

Range: 0 .. 10000

heightnumber0

Output height in pixels; 0 keeps the original height.

Range: 0 .. 10000

Example request bodyjson
{
  "file": "input.bmp",
  "width": 0,
  "height": 0
}

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

HTML to Image

html, htm png

WebP to PNG

webp png

PNG to WebP

png webp

WebP to JPG

webp jpg, jpeg

Ready to convert bmp → png? Start free — no credit card required.

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