Split PDF by file size

Split a PDF into parts that each stay under a byte limit (ZIP of PDFs).

Free on the API and MCP server — generous limits, files deleted within an hour, content never logged.

Server
This one runs on our servers — under the same privacy rules.
Files are virus-scanned before processing, stored encrypted, and deleted within 1 hour. Content is never logged. And it's free: 250 operations a day, every day, plus burst on spare capacity.

Split PDF by file size needs server-grade machinery (heavy conversion, OCR or cryptography the browser can't do safely), so it runs through the REST API and the MCP server instead of an uploader. One free key drives both — get yours in about a minute.

REST API

curl -X POST https://api.pdfmcp.org/v1/jobs \
  -H "X-API-Key: pdfmcp_live_YOUR_KEY" \
  -F [email protected] -F op=split_by_size -F max_bytes=5000000

Submit → poll → download. Full walkthrough in the REST API quickstart guide.

MCP (for AI agents)

{
  "mcpServers": {
    "pdfmcp": {
      "url": "https://mcp.pdfmcp.org/mcp",
      "headers": {
        "X-API-Key": "pdfmcp_live_YOUR_KEY"
      }
    }
  }
}

Paste into Claude, Cursor, VS Code, ChatGPT and 9 more clients — setup guides for every major MCP client.

By using the API or MCP server you agree to the Terms of Service and Acceptable Use Policy. Files you send are deleted within an hour; see the Privacy Policy.

How split pdf by file size works here

Split a PDF into parts that each stay under a byte limit (ZIP of PDFs). Server-side, the job passes the security inspection gauntlet first (antivirus, structural and active-content checks), runs in a sandboxed worker, and the result waits for you for exactly one hour.

People often pair this with merge pdfs and split pdf — same deal there: free, private, no sign-up.

Parameters

ParameterTypeDefaultDescription
max_bytesintegeroptional5000000Maximum size of each part in bytes.

FAQ

Is Split PDF by file size free?

Yes — completely free, with no watermark, no sign-up and no trial clock. On the API/MCP side every key gets 250 guaranteed operations a day plus unlimited burst operations on spare capacity. See the pricing page for the full (short) policy.

What happens to my file?

You send it to the pdfmcp API/MCP server over HTTPS. It is virus-scanned and inspected before processing, stored in an encrypted temporary volume, and automatically deleted within 1 hour of the job finishing. We never log file content or file names.

Can I automate Split PDF by file size with an AI agent or code?

Yes — the exact same operation is a tool on the pdfmcp MCP server (for Claude, Cursor, ChatGPT and other agents) and an endpoint on the REST API. One free key works for both; the guides walk you through setup in about a minute.

Are there limits?

Files up to 100 MB and 500 pages. Web tools are additionally bounded by your device's memory. The caps exist to stop abuse and keep the shared machine fair — they are not a paywall, and there is no paid tier to unlock.

Related tools

On-deviceMerge PDFsCombine multiple PDF files into one, in upload order.On-deviceSplit PDFSplit a PDF by page ranges (ZIP of PDFs) or one PDF per page.On-deviceRotate pagesRotate pages by 90, 180 or 270 degrees.On-deviceDelete pagesRemove the selected pages from a PDF.On-deviceExtract pagesCreate a new PDF containing only the selected pages.On-deviceReorder pagesRearrange pages into the given 1-based order (a permutation of all pages).

Browse the organize pdf hub or the full tool index. Building something bigger? Read the features tour and the free usage policy.