Quilt - Screenshot to PDF app for MacQuilt screenshot to PDF app for macOS logo

Free screenshot tool

Screenshot Resolution Checker

Drop in screenshots to see pixel dimensions, Retina scale, aspect ratio and file size, and check them against Mac and App Store screenshot requirements.

  • Runs on your device
  • No sign-up
  • No watermark

Drop screenshots to check

PNG, JPEG, WebP, HEIC and more·Browse files·

Opened in this tab only. Nothing is uploaded.

How to use Screenshot Resolution Checker

  1. 01

    Add screenshots

    Drop in one or more images, or paste a screenshot.

  2. 02

    Read the details

    See width, height, aspect ratio, megapixels, format and file size for each image.

  3. 03

    Check compliance

    Matches against Mac App Store, iPhone and iPad screenshot sizes are flagged instantly.

What it does well

Retina scale guess
Estimates whether an image is @1x, @2x or @3x and its size in points.
App Store checks
Compares against required Mac, iPhone and iPad screenshot sizes.
Display matching
Recognizes common Mac and iPhone native resolutions.
Batch friendly
Check a full set of marketing screenshots at once.
Quilt for Mac

Capture at exactly the right size

Quilt can capture a specific window or a precise region, at full Retina resolution, and export it in the format you need.

Download for macOSSee what Quilt can do

Free to start · macOS 14 or later · Intel and Apple silicon

Choosing a window to capture in Quilt's source picker

Questions, answered

Something else on your mind? Email [email protected].

Yes. There is no sign-up, no watermark and no daily limit. The tool is free because it runs on your own device, which costs us nothing to host.

No. Everything runs inside your browser using JavaScript and the canvas API. Your files are never sent to a server, so you can safely use this tool with confidential screenshots and documents.

Mac App Store screenshots must be 16:10 and one of 1280×800, 1440×900, 2560×1600 or 2880×1800 pixels.

Images that exactly match a known device resolution are labeled with that device’s scale. Otherwise the scale is estimated from the size: very large screenshots are almost always @2x or @3x. Treat the estimate as a hint, since image files don’t record it reliably.

Retina Macs capture at twice the point resolution. A window that looks 1440 points wide produces a 2880-pixel-wide screenshot.

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