[← All Tools](/tools/) 100% Free, No Signup 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 Reading PNG pixels... 0% Transparency detected --------------------- Transparent 0 0% Semi-transparent 0 0% Opaque 0 0% Total pixels 0 0 × 0 Original PNG ------------ ![Uploaded PNG preview]() **File:** **Alpha data:** Transparency Mask ----------------- Download 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. Copy Transparency Report Check Another PNG 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. 1 ### Choose a PNG Upload, drag and drop, or paste a PNG from your clipboard. 2 ### Scan Alpha Values The tool reads every pixel's alpha value and classifies its opacity precisely. 3 ### 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. How does the checker decide if a pixel is transparent? 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. Can a PNG have an alpha channel but no visible transparency? 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. Why are edge pixels often semi-transparent? 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. Is my PNG uploaded anywhere? No. File validation, PNG decoding, pixel analysis, report generation, and mask export all happen locally in your browser. Is the PNG transparency checker free? 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. [Contact Us](/contact/) [Explore Products](/products/)