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Documentation Index

Fetch the complete documentation index at: https://docs.openinary.dev/llms.txt

Use this file to discover all available pages before exploring further.

When no output format is specified, Openinary automatically selects the smallest format the requesting browser supports.

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How it works

1

Detect browser support

Reads the Accept header and User-Agent to determine which modern formats are supported.
2

Analyze content

Evaluates whether the image is a photo, graphic, or contains transparency to pick the best codec.
3

Pick the smallest result

Encodes in candidate formats, compares sizes, and serves the winner.Priority: AVIF → WebP → JPEG / PNG

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Typical size reductions

Original format→ AVIF→ WebP
JPEG40–50% smaller25–35% smaller
PNG50–70% smaller25–40% smaller
Actual savings depend on image content and original compression level.

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Manual format override

Use the f parameter to force a specific format regardless of browser support. 
GET /t/f_avif,q_80/image.jpg
GET /t/f_webp,q_85/image.jpg
GET /t/f_jpeg,q_90/image.jpg

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Next steps

Image Transformations

Full reference for resize, crop, rotate, and format parameters.

Upload & Cache Warming

Pre-generate optimized variants at upload time.