Image Upload for GitHub

Upload an image to img402.dev and embed the returned URL in GitHub markdown.

Screenshots are free and permanent. A UI screenshot is typically 100–400 KB, well under the 1 MB threshold where free hosting never expires — so a link you drop in a PR won't rot into a broken image six months later. You almost never need a paid tier here.

Pick a tier

* Paid permanence is service-life retention with a 90-day on-site shutdown notice — see Terms § 2A.

Quick reference

# Upload (multipart)
curl -s -X POST https://img402.dev/api/free -F image=@/tmp/screenshot.png

# Response — expiresAt is null for images 1MB and under
# {"url":"https://i.img402.dev/aBcDeFgHiJ.png","id":"aBcDeFgHiJ","contentType":"image/png","sizeBytes":182400,"expiresAt":null}

Workflow

1. Get image: Use an existing file, or capture a screenshot:

   screencapture -x /tmp/screenshot.png        # macOS — full screen
   screencapture -xw /tmp/screenshot.png       # macOS — frontmost window
   

2. Upload:

   curl -s -X POST https://img402.dev/api/free -F image=@/tmp/screenshot.png
   

3. Check expiresAt: null means permanent. A timestamp means the file was over 1 MB and will be deleted then — if the image needs to outlive that, shrink it under 1 MB and re-upload:

   sips -Z 1600 /tmp/screenshot.png  # macOS — scale longest edge to 1600px
   

4. Embed the returned url in GitHub markdown:

   ![Screenshot description](https://i.img402.dev/aBcDeFgHiJ.png)
   

GitHub integration

Use gh CLI to embed images in PRs and issues:

# Add to PR description
gh pr edit --body "$(gh pr view --json body -q .body)

![Screenshot](https://i.img402.dev/aBcDeFgHiJ.png)"

# Add as PR comment
gh pr comment --body "![Screenshot](https://i.img402.dev/aBcDeFgHiJ.png)"

# Add to issue
gh issue comment 123 --body "![Screenshot](https://i.img402.dev/aBcDeFgHiJ.png)"

Constraints

• Max size: 10 MB (every tier)
• Formats: PNG, JPEG, GIF, WebP
• Rate limit: 100,000 free uploads/day globally, 1,000/day per IP
• No auth required

Tips

• Prefer PNG for UI screenshots (sharp text). Use JPEG for photos.
• Keeping screenshots under 1 MB is worth doing on purpose: it's the line between a permanent URL and one that expires in 30 days. sips -Z 1600 usually gets there with no visible quality loss.
• When adding to a PR body or comment, use gh pr comment or gh pr edit with the image markdown.

Paid tier

For images over 1 MB that need to be permanent, pay via x402 for a token, then upload with it:

# Step 1: Get an upload token
POST https://img402.dev/api/upload/token   # $0.01 USDC → permanent, up to 10MB
# → {"token": "a1b2c3...", "expiresAt": "..."}

# Step 2: Upload with the token
curl -s -X POST https://img402.dev/api/upload \
  -H "X-Upload-Token: a1b2c3..." \
  -F image=@/tmp/screenshot.png
# → {"url":"...", "expiresAt":null}   # null = permanent

POST /api/upload/token/permanent still exists at $1.00 USDC — a legacy alias for what $0.01 now does. Don't use it for new work.

x402 payment is handled by an x402-capable client (the Payments MCP tool, @x402/client, or similar). See https://img402.dev/blog/paying-x402-apis.

Public access

Uploaded images are reachable by anyone with the URL — there is no auth on serving, and most uploads are now permanent. Never upload screenshots containing internal systems, credentials, tokens, or customer data. To remove an image, email privacy@img402.dev.