Document Conversion

Convert PDFs, Word documents, spreadsheets, and images to machine-readable formats. Marker handles complex layouts, tables, math, and images. Before you begin, make sure you have:

A Datalab account with an API key (new accounts include $5 in free credits)
Python 3.10+ installed
The Datalab SDK: pip install datalab-python-sdk
Your DATALAB_API_KEY environment variable set

Building for production? Use Pipelines to chain processors, version your configuration, and deploy with a single API call.

Quick Start

from datalab_sdk import DatalabClient, ConvertOptions

client = DatalabClient()

# Basic conversion
result = client.convert("document.pdf")
print(result.markdown)

# With options
options = ConvertOptions(
    output_format="markdown",
    mode="balanced",
    paginate=True
)
result = client.convert("document.pdf", options=options)

# Submit request
curl -X POST https://www.datalab.to/api/v1/convert \
  -H "X-API-Key: $DATALAB_API_KEY" \
  -F "file=@document.pdf" \
  -F "output_format=markdown" \
  -F "mode=balanced"

# Poll for results (use request_check_url from response)
curl https://www.datalab.to/api/v1/convert/REQUEST_ID \
  -H "X-API-Key: $DATALAB_API_KEY"

import os, time, requests

API_URL = "https://www.datalab.to/api/v1/convert"
headers = {"X-API-Key": os.getenv("DATALAB_API_KEY")}

# Submit request
with open("document.pdf", "rb") as f:
    response = requests.post(
        API_URL,
        files={"file": ("document.pdf", f, "application/pdf")},
        data={"output_format": "markdown", "mode": "balanced"},
        headers=headers
    )

check_url = response.json()["request_check_url"]

# Poll for completion
for _ in range(300):
    result = requests.get(check_url, headers=headers).json()
    if result.get("success") is False or result.get("status") == "failed":
        raise RuntimeError(result.get("error") or "Document processing failed")
    if result["status"] == "complete":
        if result.get("result_url"):
            download = requests.get(result["result_url"], timeout=60)
            download.raise_for_status()
            result = {**download.json(), **{k: v for k, v in result.items() if v is not None}}
        if result.get("success") is False:
            raise RuntimeError(result.get("error") or "Document processing failed")
        print(result["markdown"])
        break
    time.sleep(2)

The SDK handles polling automatically. For the REST API, submit a request and poll request_check_url. A status of complete means processing has ended; check success before reading the output. Failed jobs can return status="complete" with success=false and an error message. See SDK Conversion for complete SDK documentation.

File limits: Maximum file size is 200 MB, with up to 7,000 pages per request. See API Limits for the full list.

Regional Result Downloads

Convert, Extract, and Segment requests processed in the EU return a signed result_url when complete. Document content is downloaded from that URL instead of being included inline in the polling response. Check for result_url regardless of the requested region. The Python requests example above handles both forms. Download the URL without an X-API-Key header: the URL itself authorizes access. expires_in gives its lifetime in seconds; poll request_check_url again for a fresh URL if needed while the result remains retained. Downloaded extraction results can contain extraction_schema_json as an object, while the API response encodes it as a JSON string. Decode it with json.loads() only when it is a string. Keep the non-null fields from the polling response when combining it with the downloaded JSON, since billing and confidence scores can be updated after the document result was stored. Continue polling request_check_url, rather than the download URL, for these updates.

Python SDK 0.5.0 does not follow result_url for convert(), extract(), or segment(). Use the REST polling and download flow for EU results; an empty SDK content field does not establish that the document was empty.

Parameters

Core Parameters

Parameter	Type	Default	Description
`file`	file	-	Document file (multipart upload)
`file_url`	string	-	URL to document (alternative to file)
`output_format`	string	`markdown`	Output format: `markdown`, `html`, `json`, `chunks`
`mode`	string	`fast`	Processing mode (see below)

Which output format should I use?

LLM/RAG pipelines → markdown (default, most compatible)
Web display → html (preserves visual structure)
Programmatic access to blocks → json (includes bounding boxes and block types)
Embedding and search → chunks (pre-chunked for vector databases)

Processing Modes

Mode	Description	Best For
`fast`	Lowest latency, good for simple documents	High-throughput pipelines, simple layouts
`balanced`	Balance of speed and accuracy (recommended)	Most use cases
`accurate`	Highest accuracy, best for complex layouts	Complex tables, dense layouts, scanned documents

Which mode should I use?

Most use cases → balanced (recommended default)
Simple, clean PDFs at high throughput → fast
Scanned documents, complex tables, or dense layouts → accurate

Page Control

Parameter	Type	Default	Description
`max_pages`	int	-	Maximum pages to process
`page_range`	string	-	Specific pages (e.g., `"0-5,10"`, 0-indexed). For spreadsheets, filters by sheet index.
`paginate`	bool	`false`	Add page delimiters to output

Image Handling

Parameter	Type	Default	Description
`disable_image_extraction`	bool	`false`	Don’t extract images
`disable_image_captions`	bool	`false`	Don’t generate image captions

Advanced Options

Parameter	Type	Default	Description
`add_block_ids`	bool	`false`	Add `data-block-id` attributes to HTML elements
`skip_cache`	bool	`false`	Skip cached results
`save_checkpoint`	bool	`false`	Save checkpoint for reuse
`merge_cross_page`	bool	`false`	Merge tables, paragraphs, and lists that continue across pages. Adds a variable compute charge based on measured merge cost to the conversion charge.
`disable_html_prettify`	bool	`false`	Return compact HTML without added indentation or line breaks around inline tags. Applies to HTML output.
`word_bboxes`	bool	`false`	Predict per-word bounding boxes with confidence scores. Each word is inlined into HTML output as a `<span data-bbox="..." data-confidence="...">` element (markdown output strips these). Standard add-on rate: $3 per 1K pages.
`extras`	string	-	Comma-separated: `track_changes`, `chart_understanding`, `extract_links`, `extract_bookmarks`, `table_cell_bboxes`, `list_item_bboxes`, `infographic`, `new_block_types`. (`table_row_bboxes` is deprecated — use `table_cell_bboxes` instead.)
`include_markdown_in_chunks`	bool	`false`	Include markdown content in chunks/JSON output
`token_efficient_markdown`	bool	`false`	Optimize markdown for LLM token efficiency
`fence_synthetic_captions`	bool	`false`	Wrap synthetic image captions in HTML comments
`additional_config`	string	-	JSON with extra config (see below)
`eval_rubric_id`	int	-	ID of an active evaluation rubric owned by your team. Runs evaluation after ordinary document conversion; results appear in `evaluation`. Spreadsheet and `track_changes` requests use separate pipelines and do not run this evaluation.
`webhook_url`	string	-	Override webhook URL for this request
`processing_location`	string	-	Data residency region override: `"eu"` or `"us"`. When set, use `file_url` or a pre-uploaded `datalab://` reference — multipart uploads are not supported. EU processing carries a regional pricing premium.

For structured extraction, use the Extract API. For document segmentation, use the Segment API.

The track_changes extra is supported on this endpoint. You can also use the dedicated Track Changes endpoint.

Bounding Box Add-ons

Three add-ons annotate HTML output with spatial coordinates and confidence scores. At standard rates, word prediction costs $3 per 1K pages**, and each structural add-on costs another **$ 3 per 1K pages. These charges are added to conversion. Use html output to expose the attributes.

Requested features	Add-on total per 1K pages
Word boxes	$3
Table cell boxes	$6 (word prediction + table cells)
List item boxes	$6 (word prediction + list items)
Table cell and list item boxes	$9 (word prediction charged once)

Regional and account pricing can change these rates; see Billing.

Add-on	How to enable	What it annotates
Word bboxes	`word_bboxes=True`	Every word in the document gets a `data-bbox` and `data-confidence` span in HTML
Table cell bboxes	`extras="table_cell_bboxes"`	`<colgroup><col>`, `<tr>`, and `<td>`/`<th>` elements get `data-bbox`/`data-confidence`
List item bboxes	`extras="list_item_bboxes"`	Each `<li>` element gets `data-bbox`/`data-confidence`

table_cell_bboxes and list_item_bboxes run and bill word prediction internally, but do not emit per-word spans unless you also set word_bboxes=True. Adding that flag to a request with structural boxes exposes the word spans without charging word prediction twice.

from datalab_sdk import DatalabClient, ConvertOptions

client = DatalabClient()

# Get table cell bboxes only
options = ConvertOptions(
    output_format="html",
    extras="table_cell_bboxes,list_item_bboxes",
)
result = client.convert("document.pdf", options=options)
# HTML contains data-bbox and data-confidence on table cells and list items

# To also get per-word bounding boxes, pass word_bboxes=True to the REST API
# (word prediction is already included in the structural add-on charge)

Additional Config Options

Pass as JSON string in additional_config:

Key	Type	Description
`keep_spreadsheet_formatting`	bool	Preserve spreadsheet formatting
`keep_pageheader_in_output`	bool	Include page headers
`keep_pagefooter_in_output`	bool	Include page footers
`disable_html_prettify`	bool	Skip HTML pretty-printing to preserve spacing around inline tags such as superscripts, bold, and italic text

Example:

options = ConvertOptions(
    additional_config={
        "keep_spreadsheet_formatting": True,
        "keep_pageheader_in_output": False
    }
)

PDF Bookmarks

Use extras="extract_bookmarks" to read the PDF’s stored outline. metadata.pdf_bookmarks is a tree of objects with title, page, and children. page is an original, 0-indexed page number, or null when the destination cannot be resolved. These are the PDF’s authored bookmarks, not headings inferred from its content.

Check metadata.pdf_bookmarks_truncated: true means extraction was incomplete because of a safety limit or extraction failure. An empty bookmark list with this flag set does not establish that the PDF has no bookmarks.

Response Fields

Field	Type	Description
`status`	string	`processing` or `complete`; inspect `success` and `error` when complete
`result_url`	string	Signed URL for downloading the result JSON when content is not returned inline
`expires_in`	int	Lifetime of `result_url`, in seconds
`success`	bool	Whether conversion succeeded
`output_format`	string	Requested output format
`markdown`	string	Markdown output (if format is markdown)
`html`	string	HTML output (if format is html)
`json`	object	JSON output (if format is json)
`chunks`	object	Chunked output (if format is chunks)
`images`	object	Extracted images as `{filename: base64}`
`metadata`	object	Document metadata. When present, `failed_pages` lists original, 0-indexed pages that could not be parsed. An empty list means no page failures were reported. With `extras="extract_bookmarks"`, `pdf_bookmarks` contains the PDF outline.
`page_count`	int	Number of pages processed
`parse_quality_score`	float	Quality score (0-5)
`cost_breakdown`	object	Cost in cents
`checkpoint_id`	string	Checkpoint ID (if `save_checkpoint` was true)
`evaluation`	object	Evaluation results when a rubric was requested
`error`	string	Error message if failed

Examples

Convert with High Accuracy

from datalab_sdk import DatalabClient, ConvertOptions

client = DatalabClient()

options = ConvertOptions(
    mode="accurate",
    output_format="markdown"
)

result = client.convert("complex_document.pdf", options=options)
print(f"Quality score: {result.parse_quality_score}")
print(result.markdown)

HTML with Block IDs for Citations

options = ConvertOptions(
    output_format="html",
    add_block_ids=True
)

result = client.convert("document.pdf", options=options)
# HTML elements have data-block-id attributes for citation tracking

Process Specific Pages

options = ConvertOptions(
    page_range="0-4,10,15-20",  # Pages 0-4, 10, and 15-20
    output_format="markdown"
)

result = client.convert("large_document.pdf", options=options)

Process Specific Sheets from a Spreadsheet

For spreadsheet files, page_range filters by sheet index (0-based):

options = ConvertOptions(
    page_range="0,2",  # First and third sheets only
    output_format="markdown"
)

result = client.convert("workbook.xlsx", options=options)

Extract Track Changes

options = ConvertOptions(
    extras="track_changes",
    output_format="json"
)

result = client.convert("document_with_changes.docx", options=options)

Parse Quality Score

Every conversion response includes a parse_quality_score (0-5) that indicates how well the document was parsed:

Score Range	Quality	Recommended Action
4.0 - 5.0	Excellent	Use the output directly
3.0 - 3.9	Good	Review for minor issues
2.0 - 2.9	Fair	Consider retrying with `accurate` mode
0.0 - 1.9	Poor	Retry with `accurate` mode or check the input file

Use quality scores to build automated quality gates:

result = client.convert("document.pdf", options=ConvertOptions(mode="balanced"))

if result.parse_quality_score < 3.0:
    # Retry with higher accuracy
    result = client.convert("document.pdf", options=ConvertOptions(mode="accurate"))

Use quality scores to gate pipeline execution or route documents to different processing configurations.

Checkpoints

Save a processing checkpoint to reuse parsed results for extraction or segmentation without re-processing:

from datalab_sdk import DatalabClient, ConvertOptions, ExtractOptions
import json

client = DatalabClient()

# Step 1: Convert and save checkpoint
options = ConvertOptions(
    save_checkpoint=True,
    output_format="markdown"
)
result = client.convert("document.pdf", options=options)
checkpoint_id = result.checkpoint_id

# Step 2: Use checkpoint for extraction (no re-processing needed)
extraction_options = ExtractOptions(
    page_schema=json.dumps({"type": "object", "properties": {"title": {"type": "string"}}}),
    checkpoint_id=checkpoint_id
)
extract_result = client.extract("document.pdf", options=extraction_options)

Checkpoints save time and cost when you need to run multiple operations (extraction, segmentation) on the same document.

Results are deleted from Datalab servers about one day after processing completes, or sooner if you delete them with DELETE /api/v1/results/{request_id}. Retrieve your results promptly.

Next Steps

Structured Extraction

Extract structured data from documents using JSON schemas

Batch Processing

Process multiple documents concurrently

Document Segmentation

Split multi-document PDFs into segments

Webhooks

Get notified when conversions complete

General

Structured Extraction

Document Segmentation

Form Filling

File Management

Pipelines

Create Document

Track Changes

Forge Evals

Document Conversion

Quick Start

Regional Result Downloads

Parameters

Core Parameters

Processing Modes

Page Control

Image Handling

Advanced Options

Bounding Box Add-ons

Additional Config Options

PDF Bookmarks

Response Fields

Examples

Convert with High Accuracy

HTML with Block IDs for Citations

Process Specific Pages

Process Specific Sheets from a Spreadsheet

Extract Track Changes

Parse Quality Score

Checkpoints

Next Steps

Structured Extraction

Batch Processing

Document Segmentation

Webhooks

​Quick Start

​Regional Result Downloads

​Parameters

​Core Parameters

​Processing Modes

​Page Control

​Image Handling

​Advanced Options

​Bounding Box Add-ons

​Additional Config Options

​PDF Bookmarks

​Response Fields

​Examples

​Convert with High Accuracy

​HTML with Block IDs for Citations

​Process Specific Pages

​Process Specific Sheets from a Spreadsheet

​Extract Track Changes

​Parse Quality Score

​Checkpoints

​Next Steps

Structured Extraction

Batch Processing

Document Segmentation

Webhooks

Quick Start

Regional Result Downloads

Parameters

Core Parameters

Processing Modes

Page Control

Image Handling

Advanced Options

Bounding Box Add-ons

Additional Config Options

PDF Bookmarks

Response Fields

Examples

Convert with High Accuracy

HTML with Block IDs for Citations

Process Specific Pages

Process Specific Sheets from a Spreadsheet

Extract Track Changes

Parse Quality Score

Checkpoints

Next Steps