Universal workbench

Extract HEIF color palette

Find dominant colors in HEIF pixels and report CSS-ready values locally.

Device-onlyNo uploads. Ever.

Pipelines, branches, presets, naming, and detailed controls

Display

Text sizeDensity High contrast Monospace editor

Quick start

JSON → YAML WebP → PNG SVG → React JSX Plain text → Base64

From

Help me choose the best output Suggested: PDF

What matters most?

Recommendations use the registered target format and tested fidelity classification. They never inspect or upload your content.

01Input

Drop files or a folder hereChoose HEIF files or a folder — batch input is welcome

Choose files Choose folder

or paste content

02Configure & run

HEIFImage palette JSON

structural conversion · single or batch

Conversion preflightSize, memory, engine, execution, and fidelity before you start

Input: 0 B
Estimated peak memory: 48 MiB
On-demand download: No large engine download
Execution: Responsive local worker
Fidelity: No lossy step declared

What to provideDrop one or more HEIF files; this format cannot be pasted as plain text.What you’ll getProduces JSON with HEX/RGB values, sampled pixel counts, percentages, and transparency coverage.

Palette colorsMaximum number of dominant colors to return.8

Output naming & batch behavior

Filename templateAvailable variables: {output} (converter’s meaningful name), {name}, {target}, {ext}, {index}. Duplicate names receive a safe numeric suffix.

Exampleoutput.palette.json

Pipeline 1 linear · 0 branches

Why use A → B → C?

A pipeline feeds each result directly into the next compatible converter. Use one when the destination needs an intermediate representation or when you want to inspect and normalize that middle format.

JSON → CSV → XLSX turns records into rows before building a workbook.
Markdown → HTML → DOCX resolves markup before creating a document.
SVG → PNG → PDF intentionally flattens vector artwork before placing it on a page.

Only type-compatible next steps are offered. Lossy steps are marked before you run them.

1Extract HEIF color palettestructural

Add content above to start. Nothing leaves this browser.

Processing happens locally. Your file bytes are never sent anywhere.

About this conversion

How to convert HEIF to Image palette JSON

Before you start

Drop one or more HEIF files; this format cannot be pasted as plain text.

Accepted: .heif · image/heif

Choose or drag one or more HEIF files onto the drop zone.
Confirm the detected format and adjust the available settings. Mixed-format batches are flagged before conversion.
Select “Convert on this device.” Produces JSON with HEX/RGB values, sampled pixel counts, percentages, and transparency coverage.

How this converter behaves

The browser decodes the image into pixels and re-encodes those pixels in the destination format.

What happens to your data?

The conversion engine runs in this browser tab. OmniCastConverter has no upload API and never sends your content, file name, or converted result to a server.

Fidelity and limitations

This route is classified as structural. The converter preserves meaning and structure supported by both formats.

Colors are quantized into bounded RGB buckets and sampled on very large images; this is a practical dominant-color palette, not a color-managed scientific analysis.