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JPG test images

JPEG images at the size and quality you need, with an EXIF orientation tag to test rotation handling, or cut short to test error handling.

Open the .jpg generator

Or start from a preset

What is a JPEG image?

Short answer

JPEG (.jpg) is a lossy image format for photos. A file is a series of segments that start with a 0xFF marker: SOI, application segments like JFIF and EXIF, quantisation and Huffman tables, the compressed scan, and EOI at the end.

Two classic bugs: ignoring the EXIF orientation tag, so phone photos show sideways, and crashing on a file that ends early. The generator writes both cases on purpose.

Anatomy of a JPEG image

  • FF D8SOI, start of image
  • FF E0 JFIFThe JFIF header
  • FF E1 ExifEXIF metadata, here with the Orientation tag
  • FF DB / FF C4Quantisation and Huffman tables
  • FF DAStart of scan: the compressed pixels
  • FF D9EOI, end of image

What you can generate

  • 1×1 to 8000×8000 pixels
  • Quality 1 to 100
  • EXIF orientation 1, 3, 6 or 8
  • Gradient, checkerboard, colour bars, noise or solid
  • Truncated file with no EOI marker

How to make one

  1. Open the JPEG image generator, or start from a preset above.
  2. Set the size and switch on the edge cases you need; the preview and size estimate follow every change.
  3. Generate, then download. The file is made in your browser, and the same preset and seed always give you the same file.

Questions

Your browser's own JPEG encoder, through an off-screen canvas. The same settings give the same bytes in the same browser; another browser may encode slightly differently.

It tells viewers to rotate the image 90° clockwise before showing it. Software that ignores the tag shows the image sideways.

Related formats