How to Convert Files with Bitcoin Lightning
Upload any file, pick a target format, pay 100 sats, download the result. 200+ format combinations — images, documents, video, audio, archives. No account, no ads, files never stored.
For Humans
Use cases for individuals, creators, and professionals
Fix photo format mismatches
iPhone shoots HEIC but the website only takes JPG. A form wants PNG but you have a TIFF. Convert in seconds without installing an app or feeding your photo to an ad-supported website with unknown privacy practices.
Document compatibility
Need to send a DOCX as PDF for a client, or open an ODT in Microsoft Office? Convert once, pay 100 sats, move on. No monthly subscription for a task you'll do twice a month. Then merge the resulting PDFs if needed.
Video and audio format fixes
Convert an MKV to MP4 for a device that won't play it, or extract the audio track from a video as MP3. No need to install FFmpeg, HandBrake, or any other tool — just upload, select the format, and pay.
Prepare files for AI services
Many AI services only accept specific formats. Convert an image to the required format before running vision analysis or 3D generation. Convert audio to the right format before transcription.
Supported Formats
200+ combinations across 5 categories
How It Works
Upload your file
Go to sats4ai.com/file-conversion. Drag and drop or click to upload. Files up to 1GB are supported.
Select the target format
The converter detects compatible output formats automatically based on your input. Choose from the dropdown.
Pay 100 sats
Click Convert. A Lightning QR code appears for 100 sats. Scan with any Lightning wallet — Phoenix, Breez, Wallet of Satoshi, or a WebLN browser wallet.
Download
Your converted file is ready in seconds. It is never stored — download it and it's gone from the server.
For Agents
Use cases for AI agents, automation pipelines, and developers
No API key needed. The file conversion endpoint uses L402 — pay-per-file via Lightning. Agents send a file and target format, receive a 402 with an invoice, pay it, and get the converted file back. Works with any language or HTTP client.
Format normalization pipelines
Standardize incoming user uploads before processing. Convert any image to PNG, any document to PDF, any audio to MP3 — ensuring downstream services always receive a consistent format without conditional logic in your code.
Pre-processing for AI services
Many AI endpoints accept only specific formats. Agents can automatically convert a file to the required format before calling vision analysis, transcription, or 3D generation — handling the full pipeline without manual intervention.
Batch conversion workflows
Process hundreds of files programmatically — convert a library of TIFF scans to JPEG, transcode a folder of videos to MP4, or normalize an audio archive to MP3. Pay 100 sats per file, scale to any volume.
Archive extraction
Agents receiving ZIP, RAR, or 7Z archives can extract contents programmatically without installing archive tools on the host. Useful in sandboxed environments or serverless functions where installing binaries isn't possible.
L402 Authentication Flow
# Step 1: Send request (returns 402 + invoice)
curl -X POST https://sats4ai.com/api/l402/convert-file \
-H "Content-Type: application/json" \
-d '{"file":"<base64-encoded-file>","file_name":"photo.heic","extensionFrom":"heic","extensionTo":"jpg"}'
# Step 2: Pay the Lightning invoice (100 sats)
# Step 3: Resend with payment proof
curl -X POST https://sats4ai.com/api/l402/convert-file \
-H "Content-Type: application/json" \
-H "Authorization: L402 <token>:<preimage>" \
-d '{"file":"<base64-encoded-file>","file_name":"photo.heic","extensionFrom":"heic","extensionTo":"jpg"}'MCP & OpenClaw
Chain with Other Services
Convert a scanned image (HEIC, TIFF) to a standard format, then extract the text with OCR. Go from a photo of a receipt to structured text in two steps.
Convert an image to JPEG or PNG before running vision analysis — ensuring compatibility with the AI model's accepted input formats.
Convert audio from any format (WMA, OGG, FLAC) to MP3 or WAV before passing it to the transcription service.
Convert Word, Excel, or image files to PDF first, then merge all resulting PDFs into a single consolidated document.
Convert Files — No Signup Required
100 sats per conversion. 200+ format combinations. Files never stored. All you need is a Lightning wallet.