How to Convert and Merge PDFs with Bitcoin Lightning
The Problem with PDF Tools Today
You need to convert one PDF to Word, or merge three contracts into a single file. Simple tasks. But the options are not simple.
Free tools like ILovePDF and SmallPDF come with aggressive ads, popups, daily limits, and file size restrictions. They also upload your sensitive documents to unknown servers with no privacy guarantees — not ideal when you're handling contracts, financial reports, or legal paperwork.
Paid tools require monthly subscriptions: Adobe Acrobat runs $13-23/month, Nitro PDF is $14/month, and SmallPDF Pro is $9/month. All require accounts and credit cards. You shouldn't need a monthly plan to convert a single PDF.
What Sats4AI Offers
Sats4AI provides two PDF tools, each costing 200 sats paid instantly over the Lightning Network. No account, no email, no subscription. Your files are processed and deleted immediately — they are never stored on our servers.
- PDF Conversion — Convert PDF to 6 formats: DOCX, HTML, MD, ODT, RTF, TXT
- PDF Merge — Combine multiple PDFs into one file
Powered by CloudConvert for reliable, high-quality conversions. Files up to 200MB supported. Available through the browser, the L402 API, the MCP server, and OpenClaw.
Who This Is For
Anyone with a PDF
- Convert a PDF to Word to edit it. Convert to TXT for plain text. Convert to HTML for web publishing.
- Merge invoices, reports, or contracts into a single document for easier sharing.
Legal & Business
- Merge contracts, proposals, or reports into consolidated files.
- Convert PDFs for editing without losing formatting.
- Privacy matters when handling sensitive documents — no account means no data trail.
Students & Researchers
- Merge multiple paper PDFs into one file for easier reading.
- Convert PDF papers to Markdown for note-taking and citation management.
Developers
- Automate PDF processing pipelines via the L402 API or MCP server.
- Convert incoming PDFs to structured text for downstream processing.
- Merge generated reports programmatically.
What It Actually Costs
| Sats4AI | Adobe Acrobat | SmallPDF Pro | ILovePDF Premium | |
|---|---|---|---|---|
| Price | 200 sats (~$0.18) | $13-23/month | $9/month | $4-7/month |
| Signup | None | Account + CC | Account + CC | Account + CC |
| File storage | Never stored | Cloud stored | Cloud stored | Cloud stored |
| Size limit | 200MB | Varies | Varies | Varies |
At current rates, 200 sats is roughly $0.18 USD. You could convert or merge over 600 PDFs before matching the cost of a single month of Adobe Acrobat.
How to Convert a PDF
- Go to sats4ai.com/pdf.
- Upload the PDF file you want to convert. Files up to 200MB are supported.
- Select the target format from the dropdown — DOCX, HTML, MD, ODT, RTF, or TXT.
- Click Convert. A Lightning invoice for 200 sats will appear as a QR code.
- Scan the QR code with any Lightning wallet such as Phoenix, Mutiny, Alby, Zeus, or Wallet of Satoshi.
- Your converted file is ready to download in seconds.
How to Merge PDFs
- Go to sats4ai.com/pdf-merge.
- Upload the PDF files you want to merge. You can select multiple files at once.
- Arrange the files in the desired order. The PDFs will be merged in the order they are uploaded, so upload them in the sequence you want.
- Click Merge. A Lightning invoice for 200 sats will appear as a QR code.
- Scan the QR code with your Lightning wallet.
- Your merged PDF is ready to download immediately.
Automate from Code
The browser works for one-off conversions, but if you need to process PDFs in bulk or integrate into an application, Sats4AI offers three programmatic options:
L402 API
Standard HTTP API using the L402 protocol. Send a request, receive a Lightning invoice in the 402 response, pay it, and resend with the payment preimage. Works from any language or HTTP client. Ideal for batch PDF processing pipelines.
MCP Server
Model Context Protocol integration that connects directly to AI assistants like Claude. The assistant can convert or merge PDFs on your behalf with automatic Lightning payments handled in the background.
OpenClaw
OpenAI-compatible API endpoint. If your app already uses the OpenAI SDK, point it at Sats4AI's OpenClaw endpoint and pay with Lightning instead. Minimal code changes required.
Combine with Other Services
PDF tools become more powerful when chained with other Sats4AI services:
PDF Convert + OCR
Convert a scanned PDF to another format, then extract text with OCR. Useful for digitizing paper documents that were saved as image-based PDFs.
PDF Merge + File Conversion
Merge multiple PDFs into one file, then convert the result to another format. Great for consolidating documents before sharing in a different format.
PDF Convert + AI Chat
Convert a PDF to plain text, then feed the content to an AI chat model for summarization, Q&A, or analysis. Turn any PDF into an interactive conversation.
Why Pay with Bitcoin?
- Privacy — No account creation, no email address, no personal data collected. Especially important when handling sensitive documents like contracts, financials, or legal filings.
- No gatekeepers — No credit card company deciding whether your payment goes through. No subscription to cancel. No vendor lock-in.
- Instant settlement — Lightning payments confirm in milliseconds. No pending charges, no holds, no waiting.
- No commitment — Pay 200 sats when you need it. Use it once a year or ten times a day. There is nothing to cancel.
Quick Reference
| Service | Price | Formats | Max Size |
|---|---|---|---|
| PDF Conversion | 200 sats | DOCX, HTML, MD, ODT, RTF, TXT | 200MB |
| PDF Merge | 200 sats | Multiple PDFs into one | 200MB |
Try It Now — No Signup Required
Convert or merge your PDFs in under a minute. All you need is a Lightning wallet and 200 sats.