AVIF → WebP

POST /api/avif-to-webp3 quota units per call · cache hits free

Convert AVIF images to WebP. Useful when you have an AVIF and need a more broadly supported modern format that still keeps transparency.

Reads an AVIF image and returns the same picture as a WebP. Transparency is preserved (WebP supports alpha). Useful when you receive an AVIF (Apple Photos exports, modern CDNs, screenshots from new browsers) and need a more broadly supported modern format — WebP works on every browser since Chrome 32 / Firefox 65 / Safari 14, while AVIF requires Chrome 85 / Safari 16. Quality is 0–100 (default 75). The AVIF source was already lossy unless it was encoded losslessly — re-encoding to WebP won't *recover* detail. Choose `lossless: true` to encode WebP losslessly from the decoded pixels.

Inputs

Name	Type	Default	Description
image*	file	—	Input AVIF bytes.
quality	number (0…100)	75	WebP quality 0–100 (default 75). Ignored when lossless=true.
lossless	boolean	false	When true, encode losslessly from the decoded AVIF pixels. `quality` is ignored.

Response

Modes: binary, stream, json. Cache: yes (24h TTL).

Large outputs stream: responses over the 4 MiB cache limit are piped through as they are produced instead of buffered. They carry x-cache-skip: size and are never cached — identical follow-up calls recompute.

Every response carries x-cache (HIT / MISS / BYPASS), x-cache-signature (stable across identical inputs), and the rate-limit headers listed below.

Quota & limits

Cost per call	3 units against the 10,000-unit monthly quota. Cache hits are free — only cache misses decrement.
Burst limit	200 requests per rolling minute, shared across all tools.
Max request size	`16 MiB` (base64 inflates file payloads ~33% — the limit applies to the decoded bytes).
Max response size	`32 MiB`
Timeout	60s wall clock.
Rate-limit headers	`X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Burst-Limit` on every response; `X-Quota-Warning` once 80% of the monthly quota is spent; `Retry-After` on 429s.

Errors

Errors are JSON with an error string; schema failures add a details object (Zod's flattened field errors).

Status	When	Body
400	Input fails the tool's schema (wrong type, missing required field, malformed base64) or the file bytes can't be parsed as the expected format.	{ "error": "invalid inputs", "details": { "fieldErrors": { … } } }
401	Missing or invalid X-Api-Key / X-Account-Id headers (or no session when called from the browser).	{ "error": "unauthorized" }
404	Unknown tool id, or calling /api/* on the website hostname instead of api.xtract.bot.	{ "error": "not found" }
413	Request body over the tool's max request size, or an image header declaring more megapixels than the tool's pixel budget.	{ "error": "…exceeds maxRequestBytes…" }
415	Content-Type isn't application/json on the json-body transport.	{ "error": "unsupported content-type; expected application/json" }
429	Monthly quota or the 200/min burst limit exhausted. Check Retry-After and the X-RateLimit-* headers.	{ "error": "monthly quota exceeded", "monthRemaining": 0, … }
5xx	Conversion engine failure. Safe to retry; if it persists, the input is hitting a bug — please report it.	{ "error": "…" }

Code samples

Built from the default example.

# Download or substitute the example input:
#   curl -O https://xtract.bot/examples/avif-to-webp/sample.avif
IMAGE=$(base64 -w0 < sample.avif)

curl -X POST https://api.xtract.bot/api/avif-to-webp \
  -H "Content-Type: application/json" \
  -H "Accept: application/octet-stream" \
  -H "X-Account-Id: $XTRACT_ACCOUNT_ID" \
  -H "X-Api-Key: $XTRACT_API_KEY" \
  -d '{
  "image": "'"$IMAGE"'"
}'