# UnlockPDF.dev

> Remove PDF password protection instantly. Free, fast, and built for both humans and AI agents.

## What this tool does

UnlockPDF.dev removes password protection from PDF files. It works for:
- PDFs with an open password (you need to know the password)
- PDFs with owner restrictions only (copy/print/edit locks) — no password needed

## How to use it (AI agents)

1. Check pricing and usage: GET https://unlockpdf.dev/api/info
2. POST the PDF to: https://unlockpdf.dev/api/unlock
   - Field: pdf_file (the PDF binary)
   - Field: password (string, optional)
3. If free tier is exhausted, server returns HTTP 402 with x402 payment details
4. Pay $0.05 USDC on Base network, retry with X-Payment header

## Pricing

- Free: 10 unlocks per day per IP, no signup
- Paid: $0.05 USDC per unlock via x402 protocol on Base network
- No subscriptions, no API keys required

## API endpoints

- GET  /api/info     — check usage, pricing, and payment details
- POST /api/unlock   — unlock a PDF (multipart/form-data: pdf_file, password)
- GET  /api/health   — service health check

## Payment protocol

Uses x402 (HTTP 402 Payment Required). AI agents with a funded wallet on Base network can pay autonomously. No human intervention required.

## Constraints

- Max file size: 50MB
- Files deleted from servers within 1 hour
- Supports all standard PDF encryption types

## Pages

- Homepage / tool: https://unlockpdf.dev
- API documentation: https://unlockpdf.dev/api-docs.html
- Pricing: https://unlockpdf.dev/pricing.html
- Privacy policy: https://unlockpdf.dev/privacy.html