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PDF Deskew

Automatically detect and correct skewed (tilted) PDF pages. Preserves text pages as searchable vector content and only rasterizes image pages (e.g. scans).

file· File resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL
# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/pdf-deskew' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"sourceFile.ext","contentType":"application/octet-stream","size":12345}'

# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
  --data-binary @/path/to/file.ext

# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/pdf-deskew' \
  -F 'sourceFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'mode=auto' \
  -F 'manualAngle=0' \
  -F 'threshold=0.5' \
  -F 'rasterizeText=false' \
  -F 'pageRange='

© 2026 Elysia Tools. Developer documentation.

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API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP
POST https://api.elysiatools.com/en/api/tools/pdf-deskew

Parameters

NameTypeRequiredDescription
sourceFilefileupload requiredYes—
modeselectYes—
manualAnglenumberNoManual correction angle (degrees). Positive value corrects a clockwise tilt. Only used in Manual mode.
thresholdnumberNoMinimum detected skew angle (in degrees) required to apply correction in Auto mode. Smaller values detect subtle tilts.
rasterizeTextselectNoBy default text pages are preserved as searchable vector content (not deskewed). Enable this only if you need to deskew vector text content, accepting loss of text selectability.
pageRangetextNoSpecify pages to deskew (e.g., 1-3,5,7-9). Leave blank to process all pages.
File-type parameters must be uploaded first via POST /upload/pdf-deskew, then the returned filePath is passed to the corresponding file field.

Response format

File result

JSON
{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json
{
  "mcpServers": {
    "elysiatools-pdf-deskew": {
      "name": "pdf-deskew",
      "description": "Automatically detect and correct skewed (tilted) PDF pages. Preserves text pages as searchable vector content and only rasterizes image pages (e.g. scans).",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=pdf-deskew",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "pdf-deskew",
    "arguments": {
  "sourceFile": "https://example.com/file.ext",
  "mode": "auto",
  "manualAngle": 0,
  "threshold": 0.5,
  "rasterizeText": "false",
  "pageRange": ""
}
  }
}
Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).
File parameters accept a public file URL only (https://…). Local paths, data: URIs, and Base64 strings are not supported.

Questions or issues? Contact [email protected]

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