Justfill Pdf Forms MCP Server

Q: What authentication methods are supported?

You can log in interactively with `justfill-mcp login` (default), or provide a `JUSTFILL_API_KEY` (recommended), or fall back to `JUSTFILL_EMAIL`/`JUSTFILL_PASSWORD`. The server checks them in that order. Tokens auto-refresh on expiry.

Q: What file types are accepted?

The `open_pdf` tool accepts PDF files, as well as scanned images (jpg, png, tiff) which are converted to PDF deterministically (so templates still match on the same image).

Q: Is there a cost to use Justfill Pdf Forms?

Pricing follows justfill.app rules: template and AcroForm resolution are free. ML detection is free on the free plan (daily caps apply) and uses per-page credits on paid plans. Downloads consume the account's fill allowance/credits.

Q: What limits exist in the server?

Only one PDF can be open at a time per server session (keeps field IDs stable). ML detection may have false positives/negatives; the correction loop (`render_preview` → field editing) exists to fix them.

@mrmaciej1

リポジトリホームページ

基本情報

ライセンス

MIT

トランスポート

stdio

作者

mrmaciej1

投稿者

Maciej Śnieżyński

Justfill Pdf Forms MCP Server について

Fill any PDF form with AI agents — ML field detection on scans, visual review loop, reusable templates, and native AcroForm fill via justfill.app.

#pdf #forms#form-filling#automation #ocr #ai-agents

Justfill Pdf Forms MCP Server の設定

以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。

{
  "mcpServers": {
    "justfill": {
      "command": "uvx",
      "args": [
        "justfill-mcp"
      ]
    }
  }
}

Justfill Pdf Forms MCP Server のツール

ツール一覧はまだありません

この掲載には表示できるツール一覧がまだありません。サーバーにツールがないという意味ではありません。対応機能はプロジェクトのドキュメントをご確認ください。

上のボタンで一時的なサンドボックスでこのサーバーを実行し、ツール一覧を取得できます。

概要

What is Justfill Pdf Forms?

Justfill Pdf Forms is an MCP server that lets AI agents (Claude, ChatGPT, n8n, or any MCP client) detect, review, and fill PDF form fields through justfill.app. It supports AcroForm fields, saved templates, and ML-based detection for scanned images.

How to use Justfill Pdf Forms?

Install the server with uv tool install ./mcp-server (or pip install ./mcp-server), then run justfill-mcp login to authorize once. Configure your MCP client with "command": "justfill-mcp". Alternatively, set the JUSTFILL_API_KEY environment variable or use JUSTFILL_EMAIL/JUSTFILL_PASSWORD as fallback. Tools include open_pdf, render_preview, fill_pdf, save_template, and field editing tools.

Key features of Justfill Pdf Forms

Opens PDFs (including scanned images) and detects form fields
Three resolution modes: saved template (deterministic), AcroForm (native), ML detection
Confidence scores (0–1) for each ML-detected field, with raw score preserved
Preview renders with color-coded field boxes and filled values before committing
Field editing (add, update, remove) with batch operations and bulk pruning
Saves reviewed layouts as templates for deterministic future fills

Use cases of Justfill Pdf Forms

Fill a standard W-9 form with AcroForm fields automatically
Process a scanned intake form, review and correct ML detections, then save as template
Batch fill customer contracts after one-time template review
Validate and adjust field positions on complex government forms before filling
Automate form filling in n8n workflows or with a chatbot assistant

よくある質問

How does the confidence score work?

ML confidence is calibrated from 0–1: ≥0.75 means the detector is sure, 0.4–0.75 is probably right (glance at preview), <0.4 is borderline. The raw detector score is kept as `raw_score`. A confidence of 1.0 means a saved template or AcroForm field is used (deterministic, no ML).

What authentication methods are supported?

You can log in interactively with `justfill-mcp login` (default), or provide a `JUSTFILL_API_KEY` (recommended), or fall back to `JUSTFILL_EMAIL`/`JUSTFILL_PASSWORD`. The server checks them in that order. Tokens auto-refresh on expiry.

What file types are accepted?

The `open_pdf` tool accepts PDF files, as well as scanned images (jpg, png, tiff) which are converted to PDF deterministically (so templates still match on the same image).

Is there a cost to use Justfill Pdf Forms?

Pricing follows justfill.app rules: template and AcroForm resolution are free. ML detection is free on the free plan (daily caps apply) and uses per-page credits on paid plans. Downloads consume the account's fill allowance/credits.

What limits exist in the server?

Only one PDF can be open at a time per server session (keeps field IDs stable). ML detection may have false positives/negatives; the correction loop (`render_preview` → field editing) exists to fix them.

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