how to highly reduce an eps file zise

I agree that we should take a look at the contest rules. It is possible that you might be submitting Photoshop drawings that have pixel dimensions too large to compress to under 2MB. If the contest will accept (or even requires) drawings less than, for example, 2000px on a side, that might allow a compressed file size under 2MB per file.

EPS is primarily a vector file format, compatible with many vector drawing applications, such as Adobe Illustrator. You can make a relatively large and complicated vector drawing and store it as a small file. The same drawing would be a much larger file if stored as pixels in a Photoshop file. That makes me wonder if the contest expected most people to use a vector drawing program such as Illustrator or Inkscape, and submit as a ZIP-compressed EPS. That would be a small file.

EPS can also store pixels, although that isn’t what it’s meant to do. You drew in Photoshop and used Illustrator to convert it to EPS, but that had a low chance of success, because all that did was put the same Photoshop pixels in an “box” labeled EPS. It did not convert the pixels into vector objects, so the file did not get smaller. It is still being stored as pixels. The only way to convert pixels to vectors in Illustrator is to apply the Image Trace feature, although that is probably not the solution you want.

In fact you could have converted it by staying in Photoshop and simply choosing File > Save As / Photoshop EPS, although that would be no better, it would have still been pixels in an EPS file.

I looked at a few of my own Illustrator drawings, and while they are still much smaller than they would be as Photoshop files, 2MB still seems like a low low limit for Illustrator EPS format (which are larger than a native .AI format file of the same drawing). So if we could see the contest rules, that would help us a lot in answering the question properly.

These file size limits seem very small. Can you share a link to the contest and its rules?

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@Διονυσης5FBC wrote:

I made a drawing in photoshop so I converted the psd files in illustrator to eps.

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Can you send jpegs instead of eps? If you must send eps, does it make a difference if you convert in PS with Save As > Photoshop EPS . EPS is an archaic technology that has little use these days.

~ Jane