Uploading Github release link to Dev.to results into a broken image

[nbauma109]

✅ Dev.to succeeded.
https://dev.to/nbauma109/new-release-of-jd-gui-duo-is-out-2806

🖼️ Found image for https://github.com/nbauma109/jd-gui-duo/releases/tag/2.0.112: https://opengraph.githubassets.com/ff751d15bc53efcbea631b18899a382756e2365a31287fcc3b54d7df16df66a3/nbauma109/jd-gui-duo/releases/tag/2.0.112
🚀 Posting https://github.com/nbauma109/jd-gui-duo/releases/tag/2.0.112 ...
⚠️ Failed to post https://github.com/nbauma109/jd-gui-duo/releases/tag/2.0.112: Command '['npx', 'crosspost', '--mastodon', '--bluesky', '--devto', '🎉 New release of jd-gui-duo is out!\nhttps://github.com/nbauma109/jd-gui-duo/releases/tag/2.0.112\n#Java #JavaDecompiler #OpenSource #ReverseEngineering\n', '--image', '/tmp/crosspost-4_bom6pr/tmp5z3n1wz2.png']' returned non-zero exit status 1.

[nbauma109]

It works if it is posted as URL as opposed to embedded base64 for dev.to

Working:

![tmp5z3n1wz2.png](https://opengraph.githubassets.com/ff751d15bc53efcbea631b18899a382756e2365a31287fcc3b54d7df16df66a3/nbauma109/jd-gui-duo/releases/tag/2.0.112)

Not working (what's actually posted currently) :

![tmp5z3n1wz2.png](data:image/png;base64,iVBORw0…)

[nzakas]

Please give me a clean look at the exact CLI command you're using.

[nbauma109]

I’m using GitHub actions crosspost. Here’s my workflow file and logs.

crosspost.yml
logs_69027132845.zip

[nbauma109]

@nzakas could you please send me an invite on Fosstodon ?

[nbauma109]

Today I crossposted the same post on mastodon, bluesky, dev.to and it worked well on mastodon and bluesky but with dev.to, I still have some base64 representation issues:

• bluesky OK : https://bsky.app/profile/javadecompiler.org/post/3mm7vxihjcc2s
• mastodon OK : https://mastodon.social/@nbauma109/116602410932150490
• dev.to KO : https://dev.to/nbauma109/new-release-of-ecd-is-out-3egi

workflow file : https://github.com/nbauma109/ecd/blob/b39bad49228c92339d35067e184354a0d897b661/.github/workflows/crosspost.yml

logs_69752418293.zip

[nzakas]

That's odd. When I tested initially the data URIs worked on Devto. Unfortunately Devto does not have an image upload service like social media so we can't really provide a URL.

Sorry, I don't download random zip files. Please post any relevant information directly in a comment.

[nzakas]

Looking at this more closely, it could be that the image is just too big. Can you try doing a Crosspost with a small image?

[nbauma109]

I tried a tiny image of 16x16px => OK.

Then I tried the real-life image (1200x600px, 75ko) :
npx crosspost "New release of ECD++ is out! https://github.com/nbauma109/ecd/releases/tag/2026.3.10" --devto --image C:\Users\nicol\AppData\Local\Temp\crosspost-qfwuyfxi\tmpfdeqbo4x.png --image-alt "✨ Features & highlights"

Result on dev.to:

Image:

[nzakas]

Yeah that makes sense. There's probably just an upper limit to the size of the image that can be base64-encoded. OpenGraph images are quite large so that's not surprising. I'd suggest first reducing the size of the image and then trying again.