Can a PNG have an alpha channel but no visible transparency?

Yes. A PNG can store alpha data while every pixel is fully opaque. The tool reports both the pixel result and available PNG alpha metadata.

Why are edge pixels often semi-transparent?

Anti-aliasing uses partial alpha values around edges to make logos, text, and cutout subjects look smooth.

Is my PNG uploaded anywhere?

No. Validation, decoding, pixel analysis, and mask export happen locally in your browser.

Is the PNG transparency checker free?

Yes. The tool is completely free, requires no signup, and adds no watermark to the downloaded mask.

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PNG Transparency Checker

Check whether a PNG contains transparent, semi-transparent, or fully opaque pixels. See exact counts, inspect a color-coded alpha mask, and download the result. Everything runs in your browser — your image is never uploaded.

Drop a PNG here or click to choose You can also paste a PNG with Ctrl+V or Command+V PNG only • Up to 40 MB and 24 megapixels

Transparency detected

Transparent

Semi-transparent

Opaque

Total pixels

0 × 0

Original PNG

File: Alpha data:

Transparency Mask

Transparent color #111827 Semi-transparent color #ef4444 Opaque color #ffffff

Show actual semi-transparent alpha Preserve each translucent pixel's original alpha value in the mask.

More Than a Yes-or-No Check

Inspect the exact alpha composition of logos, cutouts, overlays, and exported design assets.

Exact Pixel Counts

See transparent (alpha 0), semi-transparent (alpha 1–254), and opaque (alpha 255) pixel totals and percentages.

Custom Alpha Mask

Choose colors for each opacity class, preserve real translucency when needed, and download the mask as a PNG.

Private by Design

The browser decodes and scans your PNG locally. No image data is sent to 9Pic AI or any third-party processing service.

How It Works

A direct browser-side alpha scan in three steps.

Choose a PNG

Upload, drag and drop, or paste a PNG from your clipboard.

Scan Alpha Values

The tool reads every pixel's alpha value and classifies its opacity precisely.

Inspect and Export

Review the report, customize the mask, then copy or download the result.

Frequently Asked Questions

Common questions about PNG transparency and alpha channels.

It reads the PNG's alpha values after browser decoding. Alpha 0 is fully transparent, alpha 1 through 254 is semi-transparent, and alpha 255 is fully opaque.

Yes. A PNG can store alpha data while every pixel still has an alpha value of 255. This tool reports the file as fully opaque and separately identifies alpha metadata when available.

Anti-aliasing blends object edges into the background using partial alpha. A small number of semi-transparent edge pixels is normal for smooth logos, text, and background-removed subjects.

No. File validation, PNG decoding, pixel analysis, report generation, and mask export all happen locally in your browser.

Yes. It is free to use, requires no account, and does not add watermarks to the downloaded transparency mask.

Need to Deliver Thousands of Event Photos?

Use this checker for individual PNG assets. For large event galleries, 9Pic AI handles upload, discovery, delivery, and monetization at scale.