PNG is lossless compression with a full 8-bit alpha channel. EPS is encapsulated PostScript, vector, aimed at print. ImageMagick sits between the two, and this page says exactly what happens to a PNG file on the way to becoming an EPS one.
What runs when a PNG file becomes EPS
ImageMagick 6.9.12, on a machine we rent and watch. Your PNG file is uploaded once, ImageMagick runs once, the EPS comes back, and neither file is kept. PNG to EPS is one of the 3649 pairs that engine was probed on with a real file, which is why it has a page here and why the pairs the probe could not prove do not.
What survives from the PNG into the EPS
The pixel dimensions of your PNG file. The EPS comes out the size the PNG went in, because nothing on this path resizes anything.
Every pixel value. PNG and EPS are both lossless, so the EPS file adds no compression artefacts that the PNG did not already have.
What PNG to EPS costs you
Transparency. EPS has no alpha channel, so the engine composites your PNG image onto white before encoding. Without that step ImageMagick lays black underneath, and a transparent PNG logo comes back as a black rectangle.
If a model is going to read the EPS
An EPS file is pixels, and pixels are expensive for a model to read. Handed this EPS, an assistant spends its budget looking at the picture rather than reading it, and it will paraphrase what it thinks it saw. If your PNG is mostly words, the useful move is to pull the text out of it, not to change which picture format holds it.
PNG to EPS, measured rather than promised
Running PNG to EPS against the real engine with a real file, ImageMagick wrote 151,558 bytes of EPS in under a tenth of a second, machine otherwise idle. That is one PNG file on one day and not an average, which is why the number is given together with the file that produced it.
The PNG to EPS verdict was reached by a format signature, meaning at least four bytes unique to the format were found at the right offset. Which check was used matters, because they do not all prove the same thing, and a status code of 200 proves nothing whatsoever about whether the EPS file has anything inside it.
The same PNG file, sent somewhere else
Other outputs the probe measured out of a PNG file, so the cost of choosing EPS can be read against something. Sizes do not compare across engines, because each family was probed with its own PNG witness file.
PNG to PDF: 2,536 bytes in under a tenth of a second, verified by a format signature.
PNG to JPG: 1,568 bytes in under a tenth of a second, verified by a format signature.
PNG to WEBP: 370 bytes in under a tenth of a second, verified by a format signature.
PNG to GIF: 3,512 bytes in 0.1 seconds, verified by a format signature.
PNG to TIFF: 1,466 bytes in under a tenth of a second, verified by a format signature.
What we will not pretend about PNG to EPS
A PNG file over 25 MB is refused before the upload finishes rather than after it, so you do not wait for a rejection.
A PNG to EPS run that passes 30 seconds is killed, and the ImageMagick process is killed with it. A run left behind would sit on one of the machine's two cores until somebody noticed.
No text is read out of the PNG anywhere on this path. Converting a picture to EPS never turns it into words, whatever the picture happens to contain.
ImageMagick was not saturated at sixteen simultaneous conversions: it held 47.5 a second while latency moved from 0.22 s to 0.34 s, and the service memory did not move off 51 MB. That is the measured headroom behind PNG to EPS, not a marketing number.
One PNG file at a time, chosen in the browser. There is nothing else to set up and nothing else on offer.
PNG to EPS: what people ask
What actually converts my PNG file to EPS?
ImageMagick does it, 6.9.12, on a machine we rent and watch. Not a browser trick and not somebody else service: the PNG file is uploaded once, ImageMagick runs once, the EPS comes back, and neither file is kept afterwards.
How long does PNG to EPS take?
On the file the probe used, ImageMagick took under a tenth of a second and wrote 151,558 bytes of EPS. That is one real measurement on one real PNG file, not an average and not a promise about yours: a larger PNG takes longer, and past 30 seconds the run is stopped.
What do I lose going from PNG to EPS?
The one to know about first: Transparency. EPS has no alpha channel, so the engine composites your PNG image onto white before encoding. Without that step ImageMagick lays black underneath, and a transparent PNG logo comes back as a black rectangle.
Does the transparency in my PNG survive as EPS?
No. EPS carries no alpha channel, so the transparent areas are resolved before encoding and the EPS comes back opaque. If you need to keep them, this engine writes WebP or AVIF from a PNG, and both hold a real alpha channel.
Is PNG to EPS free?
There is a free allowance every month, and one PNG to EPS conversion costs half a credit against it. When the allowance runs out the tool says so and stops, rather than quietly handing you a worse EPS.