For developers

The conversion API
for AI builders.

One endpoint. File in, file out. 690+ formats. No SDKs needed — just curl.

Try it in your browser Get a free API key See pricing
curl 
curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer ctf_live_..." \
  -F "file=@invoice.pdf" -F "target=docx" \
  -o invoice.docx

Source format auto-detected from the filename. Pass -F "source=..." only if you've renamed the file.

Quickstart

Convert a PNG to a JPG, in your language of choice. Replace YOUR_API_KEY with the key you get from /dashboard.

python 
import requests

with open("photo.png", "rb") as f:
    response = requests.post(
        "https://changethisfile.com/v1/convert",
        headers={"Authorization": "Bearer YOUR_API_KEY"},
        files={"file": f},
        data={"target": "jpg"},
    )

with open("photo.jpg", "wb") as out:
    out.write(response.content)
javascript (node 18+) 
import fs from "node:fs/promises";

const file = await fs.readFile("photo.png");

const form = new FormData();
form.append("file", new Blob([file]), "photo.png");
form.append("target", "jpg");

const res = await fetch("https://changethisfile.com/v1/convert", {
  method: "POST",
  headers: { "Authorization": "Bearer YOUR_API_KEY" },
  body: form,
});

await fs.writeFile("photo.jpg", Buffer.from(await res.arrayBuffer()));
curl 
curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "file=@photo.png" \
  -F "target=jpg" \
  -o photo.jpg
Download the full OpenAPI 3.1 spec →

Format coverage

688 conversion routes across 9 categories. Add a new format and we route it to the right engine — FFmpeg, LibreOffice, Calibre, Sharp, 7-Zip, or our browser engines.

688
Conversion routes
82
File formats
9
Categories
1
Endpoint
Image JPG, PNG, WebP, HEIC, SVG Video MP4, WebM, MKV, MOV, AVI Audio MP3, WAV, FLAC, AAC, OGG Document PDF, DOCX, ODT, RTF, TXT Spreadsheet XLSX, CSV, ODS, TSV Data JSON, YAML, XML, TOML Ebook EPUB, MOBI, AZW3, FB2 Archive ZIP, RAR, 7Z, TAR.GZ Font WOFF, WOFF2, OTF, TTF

How we compare

Most file APIs charge per format, per page, or per minute of media. We charge per conversion. That's it.

Vendor Pricing model Format breadth
ChangeThisFile
$0–$1,999/mo		 Flat per conversion. PDF, image, video, audio, document, archive — all one price. 688 routes, 82 formats across 9 categories. Image, video, audio, document, spreadsheet, ebook, archive, font, data.
CloudConvert
Conversion-minute model		 Charges per conversion-minute. Long videos and large PDFs burn minutes faster than small files. Hard to budget for unpredictable workloads. 200+ formats, mostly image/video/audio/document. Lighter on data and archive.
Unstructured
Per-page billing		 Pay per page parsed. A 200-page PDF and a 1-page PDF have wildly different costs. Optimised for RAG, not general conversion. Document-only — PDF, DOCX, HTML, EPUB. No video, audio, image, or archive.
LlamaParse
Credits per page		 Credit-based per page, with multipliers for "premium" parsing modes. Same per-page tax as Unstructured for table-heavy docs. Document-only — PDF, DOCX, PPTX, XLSX. No video, audio, image, or archive.

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Ship conversion in an afternoon.

Free up to 1,000 conversions a month, every month. No credit card. Upgrade only when you outgrow it.

See pricing Get a free API key