Cropmark

Image generation API for online stores

Send product JSON.
Get a finished marketing image.

One HTTP call turns a product title, price, and photo into a ready-to-post PNG. Built for store owners, not for designers — no editor, no canvas, no waiting.

Get an API key See the request

50 images a month, free, permanently

Request

{ "template": "product-card", "data": { "title": "Stoneware Coffee Mug", "subtitle": "350ml · Matte glaze", "price": "$24.00", "badge": "SALE", "image_url": "https://…/mug.jpg" } }

Response · 1080 × 1080 PNG

The image below is rendered live by the API right now — change the text yourself.

Live render from the API: a product card for a stoneware coffee mug
SALE
PRODUCT PHOTO
Copper Pour-Over Kettle

900ml · Gooseneck

$68.00

Before / after

The photo you have, and the post you need

Same product photograph. The finished card came back from the API in under a second.

A plain product photograph of a coffee mug, as uploaded to a store listing
What most shops post — the bare product photo
The same mug rendered as a product card with its name, price and a SALE badge
Title, price, badge — sized for a feed

No editor, no canvas, no design step. Send the product data you already have and the card comes back finished — one product or your whole catalogue.
The card above is rendered right now by the free preview endpoint, which watermarks everything it makes. Images from /generate have no watermark.

Specimens

Four templates, built for retail

Every template declares its own fields. Ask the API what it accepts and it answers.

1080 × 1080
Live

Product card

The everyday post. Photo, title, price, optional sale badge.

title · price · image_url
badge? · subtitle?
1200 × 630
Next

Social share card

Open Graph images for collection and blog pages.

title
subtitle? · image_url? · logo_url?
1080 × 1080
Next

Back in stock

Restock announcements with a call to action.

product_name · cta · image_url
1080 × 1080
Next

Testimonial card

Turn a five-star review into something postable.

quote · author
avatar_url?

Quickstart

Working image in one call

# PNG straight to disk
curl -X POST https://api.trenoxahq.com/generate \
  -H "X-API-Key: $CROPMARK_KEY" \
  -H "Content-Type: application/json" \
  -d '{"template":"product-card","data":{
        "title":"Copper Pour-Over Kettle",
        "price":"$68.00",
        "badge":"SALE",
        "image_url":"https://example.com/kettle.jpg"}}' \
  --output kettle.png

# Ask what a template needs
curl https://api.trenoxahq.com/templates -H "X-API-Key: $CROPMARK_KEY"

PNG by default, JPEG when payload size matters, base64 with ?response=base64. Identical requests are cached and return without re-rendering.

Prefer to click than to type? Every endpoint is documented and runnable as a Postman collection — including the preview, which needs no key at all.

Pricing

Pay for volume, not seats

The free tier does not expire. It is not a trial.

Tier Monthly Images / month Notes
Free $0 50 All templates. No card.
Basic $15 2,000 For a single store.
Pro $49 15,000 For catalogue-wide runs.
Ultra $199 100,000 Priority rendering.

Also available on RapidAPI if you would rather keep it on one bill.