Universal workbench

PNG sprite sheet & CSS generator

Pack an ordered set of PNG images into one transparent sprite sheet with matching CSS classes.

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: Animated PNG

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 PNG frame sequence files or a folder — batch input is welcome

Choose files Choose folder

or paste content

02Configure & run

PNG frame sequenceSprite sheet assets

lossless 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 PNG assets in stable order. Each file becomes one numbered, safely named CSS class.What you’ll getProduces sprites.png plus sprites.css containing dimensions and negative background offsets.

ColumnsNumber of items in each grid row.4Cell sizeMaximum width and height of each image cell in pixels.192GapBlank space between cells in pixels.12

Output naming & batch behavior

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

Exampleoutput.sprites.zip

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.

1PNG sprite sheet & CSS generatorlossless

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 PNG frame sequence to Sprite sheet assets

Before you start

Drop PNG assets in stable order. Each file becomes one numbered, safely named CSS class.

Accepted: .png · image/png

Choose or drag one or more PNG frame sequence 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 sprites.png plus sprites.css containing dimensions and negative background offsets.

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 lossless. The converter preserves meaning and structure supported by both formats.

Each item occupies an equal cell based on the largest source dimensions. CSS class names are sanitized from local filenames and may receive numeric suffixes.