This is a critical issue with Illustrator. Either there is a use-case for artboards on non-integer positions exporting at unspecified sizes, or this is a bug that should have been addressed a long time ago.

Why would someone want their artboard positioned on a non-integer unit? I can imagine some reasons, But in these cases, I'm curious why anyone would be satisfied with Illustrator adding a pixel or two to their export.

Adding Artboard unit snapping or correcting the export math should solve this issue. It would not solve the ultimate paradox of funneling mathematically-infinite artwork into a raster image, but it would lots of people lots of time.

So the solution I found that seems to offer more consistent behaviour is to make sure your artboards are pixel perfectly aligned first. When I first filed this issue, I too was driven by the "developer" requirement need to make icons work - same artwork, all different sizes.

So the dev tip is to make sure that you setup a multi-icon template with all the required sizes as individual artboards that are all pixel perfectly aligned. This is part of the workflow I use to generate all icons for Xcode. Save it as a template.

There is something fundamental in the rounding process where Adobe doesn't change the frame of reference to match each artboard position as they export artboards - they seem to use some global co-ordinate system and re-calcuate the frame size, despite the human actually defining in the artboard dimension. From a software point of view, if it is implemented correctly it should never have hit a rounding error nor change the artboard size defined.

As a developer, I totally re-iterate that it is a serious problem and am surprised that it takes so long for issues to be solved. I filed this 4 years ago. It wastes time. Icons iterate often at various points in the project. I'm fortunate that I drive both Xcode and Illustrator, but it would be more of a pain if somebody keeps sending you 1-pixel out artwork and they can't explain why.

This is a serious problem for developers, especially when asking artists to export at power-of-two sizes, which is critical for keeping down app sizes and even processing times with lower-end GPUs. We encounter it in every project where the artist is using Illustrator. It's very easy to miss even when you know about it. Please, Adobe, you have to fix this.

When exporting an artboard set to 512x512 pixels precisely, the resulting PNG file at 1x resolution comes out as 513x512 pixels. (This sounds not too bad, but causes ugly scaling artefacts on import to Wordpress.) I'm using Illustrator 27.5 on MacOS 12.6.5.
EDIT: Silly me, I hadn't found the other comments here (thanks mods for redirecting) - and making the X and Y integer values worked. Obvious development request: could new artboards generated by Ai be given integer coordinates by default?

Since upgrading to Illustrator 27.2 assets exports at the incorrect size. The exporter adds additional empty pixels around the asset.
1. Create a new document.
2. Create a square exactly 200x200px (Only happens when xy coordinate is not a perfect pixel)
3. Add asset to the Asset Panel
4. Export

The result for me is a 201x201px asset with an extra pixel to the right and bottom.
Other assets (I've tested) export 213x214 px, 201x211 px

Attached is another asset that completely exports wrong.

(macOS Ventura 13.1 (22C65))

For many reasons I want my images for web to be an exact size.

When I have multiple artboards and use the Export for screens option, most of the time the images that are outputted are a slightly different size to my artboards.

For example if an artboard is 1440 x 690 the image outputted might be 1441 x 691. Or sometimes just one of the dimensions will be wrong like 1440 x 691.

I can get around this for one artboard by double clicking in the corner of the rulers to reset the artboard x & y but any other artboards will still output at the wrong size.

For this reason, Export for screens has been mostly useless for me since it was first introduced and I still have to use Export > Save for web for every artboard.

Hi, I have the solution, it's almost this one.
In my side it's about the artboard position (X, Y), must be an integer.

So artboard position or dimension, but yes this is annoying.
Thanks.

Bonjour, exemple:
Une illustration dans un plan de travail qui fait 240px de large.
Si mon plan de travail est par exemple positionné: x:10.458 et y: 5.879
J'exporte en png, mon fichier fera 241px.
Je repositionne mon plan de travail: x:10.00 et y: 6.00
J'exporte à nouveau et mon ficher fera bien 240px.

C'est un problème qui existe depuis plusieurs générations, et c'est embêtant quand on fait de la précision pour du web.
Merci.

This is rubbish. I've been fighting with extra pixels for years. It got better, but these still happen occasionally.
Izabela, can you please share the file which results this (especially 8px!)?
The content is not that important, I believe, just artboards.

Put it here in the comments or send it over to sharewithai@adobe.com if you don’t want to do it publicly (then please state the link to this report for better tracking — https://illustrator.uservoice.com/forums/601447/suggestions/45798424)

And please provide the exact steps you are performing: which export method, which settings, etc. Maybe record a video even, or a GIF — this would help developers to jump to this sooner.
Thanks!

Illustrator is adding pixels when exporting:
My artboard is pixel perfect, it is positioned well and Illustrator is adding 1 pixel to it's width
Yesterday it added 8pixels to the lenght of a file.
I cropped it off in Photoshop, but it is annoying that it is changing the intended file dimensions when exporting and adding an extra step to the workflow.

Pudiste resolverlo? Tengo el mismo problema

Here is a VIDEO proving the problem exists and how to recreate it
https://youtu.be/irc6URkO3fM

Problem: when exporting a specific size, lets say 1000x1000 px square 1:1 ratio, Illustrator creates an image that is off by 1px (width/height, or both)

To recreate:
make an artboard that is 1000x1000 pixels, NUDGE the artboard on the screen so the X/Y coordinates begin to use decimal places. Export the artboard, you will see that the greater the offset of the X/Y coordinate the more the deviance of the W/H, up to 1 pixel.

This causes problems when using media in applications that have strict settings for sizes.

Expected Behavior:
Irrespective of wherever my artboard is placed on the screen my explicitly set size should be honored/enforced during the export.

Manually going and checking the exact positioning or dimensions of each artboard is not very efficient. If the artboards could ONLY align to an exact pixel position, that would solve this issue. I don't know why there would be the option to use a fraction of a pixel anyways. This issue is one of the reasons I now use Adobe XD.

So annoying, just had to go through a bunch of images and take a pixel off the size to fit a template i was exporting as.

We need a fix to this. Option to align to whole XY coordinates or just make it pixel perfect anyway.

Many times when exporting an image file, Illustrator creates a blurry line near the edge of the image, even if the design extends all the way to the edge. Sometimes an extra pixel is added to the exported file. This is because the artboard is not set to a whole number intersection (XY coordinates having decimals). You can re-align your artboard to a whole number intersection to avoid this, but it can take a very long time to do manually when you work with multiple artboards. A solution would be an option for snapping the artboard to whole XY number intersections. This will ensure perfect pixel exports and you don't have to worry about it anymore. To me this is more of a bug than a feature request. Exports should ALWAYS be pixel perfect!

The issue is especially bad, since artboards are by deafult very often positioned on a decimal location when creating them, resulting in unavoidable "rounding error" when exporting. A fix would be very welcome, if not prolonged, since the issue is arround at least since 2013 (explained here: https://logosbynick.com/illustrator-exports-1-pixel-more/)

Might I suggest a temporary alert to the user, so that we don't submit final files with the wrong dimensions to suppliers and clients?

When I export an ai file in jpg I noticed that the exported file has 1 pixel more in both dimensions.
Of course I could do something wrong, but I think it's a bug in the program.

In illustrator when "exporting as png" files are 1px too large. Temporary solution found was “save for web” as png.