.PNG

How to Open a PNG File

A .png file is a lossless, transparency-capable image format that opens natively everywhere — no extra software needed on any device. The more interesting question is usually what's hidden inside one: real color depth, embedded metadata, and sometimes a GPS location you didn't know was there.

Written & tested by the File-Extension.com team — see our testing methodology.

Category: Image (lossless, raster) Developer: PNG Working Group / W3C MIME type: image/png Native support: Every OS & browser

View & Inspect a PNG File Online

Drop a .png file below to preview it and see exactly what's inside — real color type, bit depth and transparency read from its IHDR chunk, every embedded text/EXIF metadata field, and a genuine CRC-32 integrity check run on every single chunk in the file (the same checksum algorithm PNG itself uses, verified from scratch rather than assumed).

🔒 Nothing is uploaded — your file never leaves this device

On this page

  1. View & inspect a PNG file (tool)
  2. Quick answer
  3. What is a PNG file?
  4. PNG vs JPG — which to use
  5. Opening a PNG on any device
  6. Common problems & fixes
  7. Related file extensions
  8. Technical references
  9. FAQ
Fastest answer: Just double-click it — every current OS and web browser opens PNG files natively, with no extra software needed. Use the tool above if you want to see what's actually embedded inside one (metadata, GPS data, real transparency) before sharing it, or to convert it to JPG or WebP.

What is a PNG file?

PNG (Portable Network Graphics) is a lossless raster image format created in the mid-1990s as a free, patent-unencumbered replacement for GIF. Every pixel is preserved exactly — PNG's DEFLATE-based compression never discards image data the way JPEG's does — which makes it the standard choice for screenshots, logos, icons, line art, and anything with sharp edges or text where JPEG's compression artifacts would be obvious.

Structurally, a PNG file is a sequence of typed chunks, each with its own length, 4-character type code, data, and a CRC-32 checksum covering that chunk. The mandatory IHDR chunk declares the image's dimensions, bit depth, and color type (grayscale, palette-indexed, truecolor, and either of the last two with a full alpha transparency channel added). Optional chunks carry a color profile, physical DPI, a last-modified timestamp, free-form text metadata, and — since a 2017 spec addition — a full EXIF block. That's exactly the chunk structure this page's tool reads directly, verifying each one's own real checksum along the way.

PNG vs JPG: which should you use?

  • Use PNG for: screenshots, logos, icons, diagrams, text-heavy images, or anything needing real transparency.
  • Use JPG for: photographs and other complex, continuous-tone images, where its lossy compression gives a much smaller file at a visually similar quality.
  • PNG files are typically far larger than JPGs for photographic content, since lossless compression can't shrink complex photo detail nearly as much as JPEG's lossy approach can.

Opening a PNG file on any device

  1. Windows: double-click it — opens in the Photos app by default.
  2. Mac: double-click it (opens in Preview), or press the spacebar in Finder for a Quick Look preview.
  3. Linux: opens in whatever the desktop environment's default image viewer is (usually GNOME Image Viewer, Gwenview, or similar).
  4. Any browser: drag it directly into a browser window, or use the tool on this page for a preview plus a full metadata breakdown.

Common PNG file problems and how to fix them

"It appears we don't support this file format" / the image won't display

The file may be corrupted or incompletely downloaded. Use the tool on this page's Chunks tab — if any chunk fails its CRC-32 check, or the file ends abruptly before an IEND chunk, that confirms real corruption rather than a viewer problem.

The image looks fine but has a strange colored background where I expected transparency

Some older software (and certain older browsers) don't render PNG's alpha transparency correctly and instead show a solid color. Check the Overview tab here to confirm the file genuinely has an alpha channel — if it does, the problem is with the viewer, not the file.

The PNG file is much larger than expected

PNG is lossless, so large, detailed or photographic images can produce big files. Check the Overview tab's compression estimate; if it's already highly compressed, converting to JPG (using the button above) is usually the best way to shrink a photographic PNG further.

Technical references

PNG is formally standardized by the W3C, with the current Third Edition consolidating two decades of errata into one authoritative document.

Frequently asked questions

What program opens a .png file?

Every current web browser and operating system opens PNG files natively — Windows Photos, macOS Preview and Quick Look, and any browser all display them with no extra software needed.

Does a PNG file support transparency?

Yes — PNG natively supports a full alpha channel (256 levels of transparency per pixel) in its Truecolor+alpha and Grayscale+alpha color types, which is one of its main advantages over JPEG. It can also use a simpler single fully-transparent color via a tRNS chunk.

Can a PNG file contain a GPS location or other hidden metadata?

Yes, though it's less common than in JPEGs — a PNG can carry a full EXIF block (including GPS coordinates) in its eXIf chunk, plus free-form text metadata (author, description, software used) in tEXt/zTXt/iTXt chunks. Use the tool on this page to check before sharing a PNG publicly.

Is PNG lossless?

Yes — PNG compression never discards image data, unlike JPEG. That makes it ideal for screenshots, logos, line art and anything with sharp edges or text, at the cost of larger file sizes for photographic images compared to JPEG.

Last updated September 21, 2026.