EPS is encapsulated PostScript, vector, aimed at print. PNG is lossless compression with a full 8-bit alpha channel. ImageMagick sits between the two, and this page says exactly what happens to an EPS file on the way to becoming a PNG one.
What runs when an EPS file becomes PNG
ImageMagick 6.9.12, on a machine we rent and watch. Your EPS file is uploaded once, ImageMagick runs once, the PNG comes back, and neither file is kept. EPS to PNG 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 EPS into the PNG
The pixel dimensions of your EPS file. The PNG comes out the size the EPS went in, because nothing on this path resizes anything.
Every pixel value. EPS and PNG are both lossless, so the PNG file adds no compression artefacts that the EPS did not already have.
What EPS to PNG costs you
Scalability. EPS describes shapes, PNG stores a grid of pixels, and the engine rasterises at 150 dots per inch on the way across. That density is a deliberate choice: at the 72 dpi ImageMagick defaults to, an A4 EPS page comes out 595 pixels wide and reads as a failed conversion. Enlarge the PNG afterwards and it blurs, because there is nothing left to redraw from.
If a model is going to read the PNG
A PNG file is pixels, and pixels are expensive for a model to read. Handed this PNG, an assistant spends its budget looking at the picture rather than reading it, and it will paraphrase what it thinks it saw. If your EPS is mostly words, the useful move is to pull the text out of it, not to change which picture format holds it.
EPS to PNG, measured rather than promised
Running EPS to PNG against the real engine with a real file, ImageMagick wrote 1,303 bytes of PNG in 0.1 seconds, machine otherwise idle. That is one EPS file on one day and not an average, which is why the number is given together with the file that produced it.
The EPS to PNG 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 PNG file has anything inside it.
The same EPS file, sent somewhere else
Other outputs the probe measured out of an EPS file, so the cost of choosing PNG can be read against something. Sizes do not compare across engines, because each family was probed with its own EPS witness file.
EPS to PDF: 339,266 bytes in 0.1 seconds, verified by a format signature.
EPS to JPG: 5,782 bytes in 0.1 seconds, verified by a format signature.
EPS to WEBP: 906 bytes in 0.1 seconds, verified by a format signature.
EPS to GIF: 9,463 bytes in 0.2 seconds, verified by a format signature.
EPS to TIFF: 834,330 bytes in 0.1 seconds, verified by a format signature.
Other ways into PNG, and what they measured
Among the published routes into PNG, EPS is the sixth largest output of the 13 measured. The witness files differ, so this ranks the probe run and not your document.
HEIC to PNG: 1,403 bytes in under a tenth of a second.
JPG to PNG: 805 bytes in under a tenth of a second.
WEBP to PNG: 4,003 bytes in under a tenth of a second.
SVG to PNG: 1,268 bytes in under a tenth of a second.
GIF to PNG: 3,894 bytes in under a tenth of a second.
What we will not pretend about EPS to PNG
An EPS file over 25 MB is refused before the upload finishes rather than after it, so you do not wait for a rejection.
An EPS to PNG 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 EPS anywhere on this path. Converting a picture to PNG 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 EPS to PNG, not a marketing number.
One EPS file at a time, chosen in the browser. There is nothing else to set up and nothing else on offer.
EPS to PNG: what people ask
What actually converts my EPS file to PNG?
ImageMagick does it, 6.9.12, on a machine we rent and watch. Not a browser trick and not somebody else service: the EPS file is uploaded once, ImageMagick runs once, the PNG comes back, and neither file is kept afterwards.
How long does EPS to PNG take?
On the file the probe used, ImageMagick took 0.1 seconds and wrote 1,303 bytes of PNG. That is one real measurement on one real EPS file, not an average and not a promise about yours: a larger EPS takes longer, and past 30 seconds the run is stopped.
What do I lose going from EPS to PNG?
The one to know about first: Scalability. EPS describes shapes, PNG stores a grid of pixels, and the engine rasterises at 150 dots per inch on the way across. That density is a deliberate choice: at the 72 dpi ImageMagick defaults to, an A4 EPS page comes out 595 pixels wide and reads as a failed conversion. Enlarge the PNG afterwards and it blurs, because there is nothing left to redraw from.
What pixel size does the PNG come out at?
Whatever 150 dots per inch makes of your EPS, and that density is a decision rather than a default. An EPS carries shapes and page dimensions, never pixels, so a scale has to be fixed before a single pixel is drawn. If you need another size, the EPS is the file to go back to: of the two it is the only one that still knows the shapes.
Is EPS to PNG free?
There is a free allowance every month, and one EPS to PNG 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 PNG.