CSS minify

POST /api/css-minify2 quota units per call · cache hits free

Minify CSS for production. Removes whitespace and comments, shortens values, dedupes rules. Optional source map. Modern CSS supported (nested rules, custom properties, container queries).

Compresses a CSS document to its smallest equivalent form. Whitespace and comments are removed; numeric values are shortened (`0.5px` → `.5px`); colours are converted to their shortest representation; redundant declarations are dropped. Modern CSS features are supported: nested rules, custom properties, container queries, `@layer`, `@scope`, and the colour-related additions from CSS Color Module 4 / 5. For an even smaller bundle, gzip- or zstd-compress the output with the matching tools.

Inputs

Name	Type	Default	Description
css	string	—	Source stylesheet (UTF-8). Provide this OR `cssFile`.
cssFile	file	—	Upload the stylesheet as a file instead of pasting it inline. Decoded as UTF-8 server-side; provide this OR `css`.
filename	string	"input.css"	Filename used in warnings / errors. Doesn't affect the output bytes.
errorRecovery	boolean	false	When true, recover from parse errors and emit what could be parsed; warnings list the problems.

Response

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

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	2 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	`16 MiB`
Timeout	30s 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.


curl -X POST https://api.xtract.bot/api/css-minify \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "X-Account-Id: $XTRACT_ACCOUNT_ID" \
  -H "X-Api-Key: $XTRACT_API_KEY" \
  -d '{
  "css": "body {\n  background-color: #ffffff;\n  color: rgb(0, 0, 0);\n  margin: 0px 0px 0px 0px;\n}\n"
}'