Image Compression & Resizing

Convert format

Convert between JPEG / PNG / WebP while validating MIME, extension, declared format and actual byte format; transparent → JPEG requires a user-selected background. AVIF is refused without a verified codec.

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Inputs and parameters

• image — Image file
• targetFormat — Target format
• backgroundColor — Transparency background (#RRGGBB)
• quality — Quality (1–100)
• lockAspect — Lock aspect ratio

Real example

PNG 800×600, alpha=true, targetFormat=jpeg, backgroundColor=#3366CC
→ {"background":{"required":true,"color":"#3366CC","rgb":[51,102,204],"alphaRemoved":true},"output":{"format":"jpeg","mime":"image/jpeg","ext":"jpg","alpha":false,"envelopeConsistent":true}}

Limits and failure handling

A target format must be selected explicitly; unverified formats such as AVIF and JXL are not offered and no disguised file is ever emitted. No real encoded bytes exist this round — output is a validated JSON plan; real format conversion is untested.

FAQ