Document Translation

In order to translate a document with the Lilt API, you need to upload the file into a Lilt project first and then you can download it with the translations:

  1. Upload a file to a project

    # Python; Note: This is just a stub
    def upload_document(filename, projid):
     payload = {"key": lilt_api_key}
     jsonData = {"name": filename, "project_id": projid}
     headers = { "LILT-API": json.dumps(jsonData), "Content-Type": "application/octet-stream" }
     with open(fileName, 'r') as fp:
         rawdata =
     res = + "/documents/files", params=payload, data=rawdata, headers=headers, verify=False)
     return res.json()["id"]
  2. Check upload status and success. A document needs to be successfully imported before you can translate and export it. You can check if a document import is still in progress and whether it was successful.

    # Python; Note: This is just a stub
    import_success = False
    payload = {"key": lilt_api_key, "id": docid}
    while True:
     res = requests.get(lilt_api_url + "/documents", params=payload, verify=False)
     if res:
         doc_stats = res.json()
         import_success = doc_stats["import_succeeded"]
         if not doc_stats["import_in_progress"]:
    if import_success:
     download_document(filename, docid)
  3. Translate and download the file

    # Python; Note: This is just a stub
    def download_document(filename, docid):
     payload = {"key": lilt_api_key, "id": docid, "is_xliff": "false", "mt_only": "true"}
     res = requests.get(lilt_api_url + "/documents/files", params=payload, verify=False)
     with open(filename, 'wb') as fp:

To adapt your machine translation engine and update the TM in your Memory you should also add the new segments with their final correct translation (after verification/processing by a translator or bilingual) to the Memory.


Lilt performs sentence segmentation on source segments for internal representation. To bypass the segmentation of XLIFF files, add a <seg-source> element which indicates a segmented source, and corresponding <mrk> markers inside the segment to specify the segment boundaries. Note that you have to put both, <source> and <seg-source>, even if ultimately the latter overrides the former. For example:

    <source>Segment this source. Any content here will be imported as multiple segments in Lilt. Try it out!</source>
    <seg-source><mrk mtype="seg">Do not segment this source. Any content here will be imported as one segment in Lilt. Try it out!</mrk></seg-source>
    <target />

To learn more, see the full API reference.

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Last updated on 21st September 2018