Venice Image Editing

Four endpoints, all operating on existing images:

Endpoint	Purpose
POST /image/edit	Transform one image with a text prompt.
POST /image/multi-edit	Composite / layer several images with a single prompt. Also has a multipart/form-data variant.
POST /image/upscale	Upscale 2× or 4×.
POST /image/background-remove	Produce a transparent cutout.

For text-to-image generation, see venice-image-generate.

Shared rules

• Input image accepts base64 string, file upload (multipart for /image/multi-edit), or HTTPS URL (for edit + multi-edit + background-remove).
• File size < 25 MB. Image dimensions must be between 65,536 (256×256 equivalent) and 33,177,600 pixels (~5,761×5,761). Upscale caps at 16,777,216 pixels after scaling.
• HTTPS URLs must be publicly reachable from Venice's network.
• All four endpoints return the image as binary, never JSON. There is no return_binary field on edit / multi-edit / upscale / background-remove (that flag only exists on /image/generate). /image/edit and /image/multi-edit return image/png, image/jpeg, or image/webp depending on output_format; /image/upscale and /image/background-remove always return image/png.

/image/edit

Edit one image with a short, descriptive prompt.

curl https://api.venice.ai/api/v1/image/edit \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "firered-image-edit",
    "prompt": "Change the color of the sky to a sunrise",
    "image": "iVBORw0KGgoAAAANSUhEUg...",
    "aspect_ratio": "16:9",
    "safe_mode": true
  }'

Field	Notes
model	Default firered-image-edit. See GET /models?type=inpaint for edit-capable models. modelId is accepted for backwards compatibility but deprecated on /image/edit — prefer model.
prompt	Required, ≤ 32 768 chars (usually 1500 is plenty). Short & specific works best.
image	Required. Base64 string, file upload, or https:// URL.
aspect_ratio	Optional: auto, 1:1, 3:2, 16:9, 21:9, 9:16, 2:3, 3:4, 4:5. Supported values vary per model — check constraints on GET /models.
resolution	Optional tier, e.g. "1K", "2K", "4K". Defaults to "1K". Supported values vary per model.
output_format	Optional jpeg | png | webp. When omitted, inferred from resolution: PNG for 1K, JPEG for 2K/4K.
enhance_prompt	Optional bool, default false. Rewrites your prompt against the input image before editing. Costs extra credits and adds up to ~30 s. The rewritten prompt comes back URL-encoded in the x-venice-enhanced-prompt response header.
disable_prompt_optimization_thinking	Optional bool. Skips the model's prompt-optimization thinking step for speed. Only honored by models with supportsOptimizePromptThinking; ignored elsewhere.
safe_mode	Default true; blurs adult content.

Good prompts: "remove the tree", "add sunglasses to the cat", "make the sky a vivid orange sunrise".

Edit-capable model IDs change often. Read them from GET /models?type=inpaint rather than pinning a literal, and note that older IDs like qwen-edit have been retired in favor of qwen-image-2-edit and friends.

/image/multi-edit

Combine several images into one with a prompt. The first image is the base; the rest are layers / masks / references. The minimum is 1 image and the maximum is model-specific — read capabilities.maxInputImages from GET /models.

Field name: /image/multi-edit takes modelId, not model. This is the only image endpoint that uses modelId as the primary field name.

JSON (base64 or URLs)

{
  "modelId": "firered-image-edit",
  "prompt": "Place the person from image 2 onto the beach in image 1",
  "images": [
    "https://example.com/beach.jpg",
    "data:image/png;base64,iVBOR..."
  ],
  "safe_mode": true
}

Multipart (file upload)

POST /image/multi-edit
Content-Type: multipart/form-data

--boundary
Content-Disposition: form-data; name="modelId"

firered-image-edit
--boundary
Content-Disposition: form-data; name="prompt"

Place the person from image 2 onto the beach in image 1
--boundary
Content-Disposition: form-data; name="images"; filename="base.jpg"
Content-Type: image/jpeg

<bytes>
--boundary
Content-Disposition: form-data; name="images"; filename="subject.png"
Content-Type: image/png

<bytes>
--boundary--

Field	Notes
modelId	Required field name (multi-edit does not accept model). Default firered-image-edit.
prompt	Required, ≤ 32 768 chars.
images	Required. Minimum 1; maximum is model-specific (capabilities.maxInputImages). JSON variant accepts base64 or HTTPS URLs; multipart variant accepts raw file parts.
aspect_ratio	Optional; inferred from the first image when set to auto or omitted.
resolution	Optional tier, e.g. "1K", "2K", "4K". Defaults to "1K".
output_format	Optional jpeg | png | webp. Inferred from resolution when omitted.
quality	Optional low | medium | high for models that support it (e.g. GPT Image 2). Higher values can raise the charge.
enhance_prompt	Optional bool, default false. Same behavior and x-venice-enhanced-prompt header as /image/edit.
disable_prompt_optimization_thinking	Optional bool.
safe_mode	Default true.

/image/upscale

Upscale 2× or 4×. This endpoint has three fields.

Breaking change: /image/upscale no longer accepts enhance, enhanceCreativity, enhancePrompt, or replication, and no longer accepts scale: 1. The enhancer knobs were replaced by a single creativity field with a much narrower range. If you are sending the old fields, drop them.

curl https://api.venice.ai/api/v1/image/upscale \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "image": "iVBORw0KGgo...",
    "scale": 4,
    "creativity": 0.01
  }'

Field	Type	Default	Notes
image	base64, file upload	—	Required. Must be ≥ 65 536 px² to start, < 25 MB, and ≤ 16 777 216 px after scaling.
scale	number, 2 or 4	2	Must be either 2 or 4. 4 on large images is dynamically reduced to stay within the 16 MP output cap.
creativity	number, 0–0.02	0.01	How much detail and texture the upscaler adds. Higher adds more; lower stays closer to the source. Values outside the range are clamped, so 0.5 behaves as 0.02, not as "half creative". Nullable.

Also available as multipart/form-data. Response is the upscaled image as binary image/png.

/image/background-remove

Produce a transparent PNG cutout.

# With base64
curl https://api.venice.ai/api/v1/image/background-remove \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"image": "iVBOR..."}'

# With a URL
curl https://api.venice.ai/api/v1/image/background-remove \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"image_url": "https://example.com/photo.jpg"}'

Send either image (base64 / file) or image_url. Response is image/png with alpha channel.

Error behavior (all four endpoints)

Code	Cause
400	Bad params — image dims out of range, file too large, unknown model, unsupported aspect ratio for the model, content-policy refusal.
401	Auth failed. (Pro-gating on these paths surfaces as 400 / 402 depending on condition.)
402	Insufficient balance. Bearer: plain { "error": "Insufficient balance" }. x402: PAYMENT_REQUIRED body + PAYMENT-REQUIRED header.
415	Wrong Content-Type (e.g. JSON sent to a multipart endpoint, or vice versa).
429	Rate limited.
500 / 503	Inference / capacity issue — retry with jitter.

(413 and 422 are not documented for these image paths in the OpenAPI spec — a 413 from the platform may still appear if you exceed ingress limits, but treat 400 / 415 as the primary failure surface.)

Gotchas

• /image/multi-edit images[] explicitly accepts data:image/...;base64,... URLs or plain base64. For /image/edit and /image/upscale, send base64 as a plain string unless the docs say otherwise — if your client adds a data: prefix and you get a 400, strip it.
• For multipart /image/multi-edit, the field name is images and you send multiple parts with the same field name — order matters (base first).
• Field-name asymmetry: /image/edit prefers model (modelId is a deprecated alias). /image/multi-edit accepts only modelId. Get the name right per endpoint — sending the wrong one is a 400.
• /image/upscale with scale=4 on a large input is silently clamped to stay under 16 MP.
• creativity on /image/upscale is not the old enhanceCreativity under a new name. Its usable range is 0 to 0.02, so port enhanceCreativity: 0.5 as creativity: 0.02 (the maximum), not as 0.5.
• enhance_prompt on edit / multi-edit bills extra credits whenever a rewrite is produced. Leave it off for latency-sensitive or cost-sensitive calls.
• safe_mode: true can blur otherwise valid inputs if the source image trips content classifiers; switch to false (and handle the legal/ToS consequences yourself) when you control the input.
• /image/background-remove takes either image or image_url, not both.