How to Convert Files with Bitcoin Lightning

The Problem with File Conversion Today

Online file converters are full of ads, popups, and dark patterns. Many upload your files to unknown servers with no indication of what happens to them after conversion. You click through three screens of upsells just to convert a single HEIC photo to JPG.

Paid services like CloudConvert ($8-25/month) and Zamzar ($9-25/month) solve the quality problem but introduce subscriptions. If you convert files once a month, you're paying for 30 days of access you don't use. Desktop tools like HandBrake handle specific formats well but can't touch documents, images, or archives.

For a one-off conversion — HEIC to JPG, DOCX to PDF, MKV to MP4 — you shouldn't need to install software, create an account on a sketchy website, or pay for a monthly subscription.

What Sats4AI Offers

Sats4AI's file converter supports over 200 format combinations for 50 sats per conversion. Upload any file, pick a target format, pay a Lightning invoice, and download your converted file. Images, documents, video, audio, and archives — one tool handles everything.

Files are processed and never stored. No account, no email, no subscription. Your file goes in, the converted file comes out, and nothing is kept on the server.

Who This Is For

Individuals

• Photos — Your iPhone shoots HEIC but the website needs JPG. Convert it in seconds without installing an app or uploading to a random converter site.
• Documents — Need to send a DOCX as PDF for compatibility? Or convert an ODT to DOCX for a colleague on Microsoft Office? One conversion, 50 sats.
• Video and audio — Convert MKV to MP4 for a device that won't play it, or extract audio from a video as MP3. No need to install FFmpeg or HandBrake.
• Archives — Extract RAR, 7Z, or TAR.GZ files without installing WinRAR or any other archive tool.

Developers and Businesses

• Automated document processing — Convert uploaded user files to a standard format in your pipeline. Pay per conversion with Lightning — no vendor contracts, no monthly minimums.
• Format standardization — Normalize incoming files to a single format before processing. TIFF to PNG, DOC to PDF, WAV to MP3.
• Batch conversion — Chain conversions programmatically via the L402 API. Process hundreds of files, pay per file.
• AI agent workflows — An AI assistant using the MCP server can convert files as part of a larger task — transforming formats before analysis, extraction, or delivery.

What It Actually Costs

50 sats per conversion, any format to any supported format. No tiers, no credits, no expiration. Here's how it compares:

Supported Formats

The file converter handles a wide range of format categories. Here are some of the most popular conversions:

How to Convert a File

1. Go to sats4ai.com/file-conversion.
2. Upload the file you want to convert. Drag and drop or click to browse your device.
3. Select the target format from the dropdown menu. The converter automatically detects compatible output formats based on your input file.
4. Click Convert. A Lightning invoice for 50 sats will appear as a QR code.
5. Scan the QR code with any Lightning wallet (Phoenix, Alby, Zeus, Wallet of Satoshi, etc.).
6. Your file is converted and ready to download in seconds.

Automate Conversions from Your Code

Three ways to convert files programmatically, all pay-per-use with Lightning — no contracts, no API keys to manage, no monthly fees:

L402 API

Standard HTTP API with Lightning-native authentication. Send a request with your file, receive a Lightning invoice in a 402 response, pay it, resend with the payment proof, and get your converted file back. Works with any language that can make HTTP requests. See the docs.

MCP Server

Connect any MCP-compatible AI agent (Claude, GPT, custom agents) to Sats4AI's tool server. The agent can convert files as part of its workflow — transforming formats before analysis, OCR, or delivery. The AI handles the payment flow automatically. See the docs.

OpenClaw

Open protocol for AI agents to discover and use tools autonomously. Agents find Sats4AI's file conversion service through the registry, negotiate payment, and convert files without human intervention. Learn more.

Combine with Other Sats4AI Services

The real power shows up when you chain services together. Every Sats4AI service works the same way — pay per use with Lightning, no accounts — so they compose naturally:

• File Conversion + OCR — Convert a scanned document to PDF, then extract the text with OCR. Go from a photo of a receipt to structured text in two steps.
• File Conversion + Vision — Convert an image from one format to another (HEIC to JPG, TIFF to PNG), then analyze it with an AI vision model. Useful when the AI model only accepts certain image formats.

Why Pay with Bitcoin?

• Instant — Lightning settles in milliseconds. No pending charges, no authorization holds, no billing surprises.
• No gatekeepers — No bank or payment processor can restrict your access. Bitcoin is borderless — works the same from anywhere in the world.
• No commitment — Pay for exactly what you use. No subscriptions, no credit packs, no expiring balances. Use it once and never come back, or use it every day.
• Privacy — No account, no email, no personal data. Your files are processed and discarded. Nothing is tied to your identity.

Quick Reference