TXT to HTML API

Convert txt files to html 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

txt

Output

html (text/html)

Credit cost

1 per file

Max file size

Per plan (10–500 MB)

Endpoint

POSThttps://api.fileswitch.co/api/v1/converter/txt-to-html

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/txt-to-html \
  -H "Authorization: Bearer fc_YOUR_API_KEY" \
  -F "file=@input.txt"

Parameters

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

Field	Type	Default	Description
file	binary	—	The file to convert. Accepts `.txt`
toc	boolean	false	Generate a table of contents.
title	string	—	Document title written into the HTML head and body.
lang	string	—	ISO language code for the lang attribute, e.g. "en" or "fr-CA".

Example request bodyjson

{
  "file": "input.txt",
  "toc": false,
  "title": "",
  "lang": ""
}

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 PDF

html, htm pdf

HTML to Markdown

html, htm md

Markdown to HTML

md, markdown html

DOCX to PDF

docx pdf

Ready to convert txt → html? Start free — no credit card required.

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