Image API – Portal

Convert JPG/PNG to AVIF or WebP via a simple HTTP API. Create an access key below, then POST your image to https://imageapi.onepixel.pt/api.php.

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WordPress plugin available

Convert your entire media library to AVIF / WebP — locally or via this API — and serve them automatically.

v1.0.6 · 26.2 KB · updated 2026-04-19

Download .zip

Create access key

Existing keys

Key	Label	Created	Last used	Uses
04439bbb1be534bf07ed2db31b85a340bc8f1824d7d2642e		2026-04-19 00:11:56	2026-04-19 01:11:08	3073

Usage

POST multipart/form-data to https://imageapi.onepixel.pt/api.php with these fields:

key – your access key (or send via X-API-Key header)
image – the JPG or PNG file
format – avif or webp
quality – optional, 1–100 (default 75 for WebP, 60 for AVIF)
effort – optional, 0–9 for AVIF (default 6) or 0–6 for WebP (default 4)

The response body is the converted binary image with the appropriate Content-Type.

cURL example

curl -X POST https://imageapi.onepixel.pt/api.php \
  -F "key=YOUR_KEY" \
  -F "format=avif" \
  -F "quality=55" \
  -F "[email protected]" \
  --output photo.avif

AVIF encoded with libavif/aom · WebP encoded with libwebp (sharp YUV).