Julian Fietkau

Human-computer interaction #HCI, computer science & programming, home server & self-hosting, games and other fun stuff.

Fediverse tool builder: Encyclia (npub120s…0fq8), WebFinger Split-Domain Canary (npub122f…9tl4), FediRoster, Pinhole, ... see https://fietkau.software/tag/fediverse for more. I also help out with Fedidevs (npub1c23…7hg6). If you do HCI-related research, check out https://directory.hci.social.

He/him. Posting mostly in English, but you might see the occasional German boost.

Website: https://fietkau.me
Employer: https://www.unibw.de/julian.fietkau
Matrix: https://matrix.fietkau.social/to/#/@julian:fietkau.social
ORCID: https://encyclia.pub/0000-0001-7264-8496

Public Key

npub1vm0mfw89yauuuvwjjtupdfnqz2377jueq2epaqvp4rjcurgzpmqscu3lyd

NIP-05 Address

julian_at_fietkau.social@momostr.pink

Profile Code

nprofile1qqsxdha5hrjjw7wwx8ff97qk5esp9gl0fwvs9vs7sxq63evwp5pqasgpz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0dsfcuxmn

Publishing to

public.relaying.io

Author Public Key

npub1vm0mfw89yauuuvwjjtupdfnqz2377jueq2epaqvp4rjcurgzpmqscu3lyd

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Last Notes

2026-03-10 15:29:59 UTC

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Oh excellent! Please let me know when the new version is live on your blog and I'll test again. 🙂

2026-03-10 14:57:18 UTC

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Right, and my server seems to have gotten the corresponding `Accept`. 👍 But if you look at https://social.wake.st/@liaizon/116205306320048221 and scroll down, you see that @npub1xse…lgk3 can't see the quote in my reply (and neither can people on any other server looking at this thread). This is because the `QuoteAuthorization` needs to be publicly resolvable: https://fediverse.codeberg.page/fep/fep/044f/#verifying-third-party-quote-posts

2026-03-10 14:31:03 UTC

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Alas, the PR has been merged, so it'll be a long while until I bother Claire again. 🙂
But I'll keep updating my own list. I see in the code where the interaction policy is declared, but not where individual quotes are authorized. If I quote this post here, let's test if both of us will see the quote.
https://blog.fabiomanganiello.com/article/Madblog-federated-blogging-from-markdown
#note1rcm…nqw5

2025-10-06 12:19:43 UTC

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I had that problem with https://fietkau.media/up_in_the_air and worked around it by creating the three.js audio object that plays all the game sound & music after the first click on one of the title screen buttons: https://fietkau.software/Up-in-the-Air.git/blob/ffba7c824eaf5dfaa9cebb7fac43eb6f5d85dd5c/main.js?hb=HEAD#l2115
It just means the loading bar and title screens can't have sound. 😇
Vanilla JS audio objects might behave slightly differently from three.js ones, I don't know. But I think the idea that the direct interaction event gives you permission to play sound is the same.

2025-09-25 16:02:45 UTC

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I respect it! 🙂 Were you able to get the outline from the official logo? The one on the website is an SVG, so I hope it was an easy job without any tracing.

2025-08-07 14:20:47 UTC

So last year I organized a small fediverse meetup during break time at @npub1dnm…nnxw and we ended up with a handful of people exchanging tips, hopes, ideas, and contact details.
Should we try that again this year in #Chemnitz? Who here is going to @npub1dnm…nnxw? 🙂
#MuC2025 #MCI #HCI

2025-03-03 01:55:01 UTC

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Cool stuff! 🙂 I made something similar once, where I decided to build a version of tic tac toe as a tiny web game and encoded the full thing as a QR code holding a data URI: https://fietkau.plus/#game_in_qr
Sadly it didn't run via any QR code scanner I tried. But it is small enough to fit!

2025-02-08 17:46:55 UTC

A cursed #ActivityPub idea.
Problem: Remote profiles sometimes look empty on Mastodon because only the stickied posts are synchronized on profile update.
Observation: Neither the ActivityPub nor Mastodon specs limit the number of sticky posts on a profile. Nothing says you can't have 100 000 sticky posts.
Solution: an ActivityPub server implementation that auto-stickies every single post you write.
The things I come up with thinking about @npub1tlf…wz08 while in the shower.

2025-02-08 10:02:00 UTC

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Same for Letterbook, have you taken a look at it before? https://letterbook.com There isn't much literally to see yet, but from what I hear it's progressing well.
Oh yeah, and the Iceshrimp team lead is also a woman. Same for the glitch-soc fork of Mastodon.

2025-02-06 00:02:14 UTC

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Tell me if I'm being unreasonably nitpicky about semantics, but no, Mastodon still doesn't display Markdown in posts and has never done so either. It has expanded the set of allowable HTML tags for Mastodon 4.2. The second link in my reply has the full before and after lists.
So the chain is, Akkoma supports Markdown input, renders it to HTML locally and sends that to other servers via ActivityPub. Mastodon then sanitizes the received HTML and provides it to the client. 🙂

2025-02-04 01:50:22 UTC

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He'll probably clarify this himself, but just to head it off a bit: @npub1zdf…6u9l didn't build a search engine or a database, but an ephemeral browser-based display of the public timeline. Bit of a difference in scope (and privacy).

2025-01-16 19:33:33 UTC

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The best help I can offer is to tag a few people who might know. 😔 Like @npub1pty…e8yx or @npub1qe8…xfmz. Do you know where someone could be pointed? https://social.wake.st/@liaizon/113838218708110283

2024-11-22 10:19:24 UTC

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I haven't tried this, but I believe other server software will for the most part not acknowledge the new account if the cryptographic signing keys are different. If you manage to migrate those as well, and use a server software that lets you reuse not just your handle but also the same ActivityPub ID, you should be able to achieve account continuity.

2024-10-30 15:12:56 UTC

I am publishing a small #ActivityPub / #fediverse project: https://fietkau.software/webfinger_canary and @npub122f…9tl4 🙂
It is a tiny bot showcasing a split-domain WebFinger setup, where the handle domain is different from the ActivityPub server domain. This is supported by Mastodon and some other ActivityPub implementations, but not all of them.
So this project, aimed at devs and power users, is part test case, part feature recommendation/advocacy. The bot's website at https://correct.webfinger-canary.fietkau.software/ has all the details.

2024-09-12 17:05:10 UTC

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I pushed a feature update for :fietkau_software: https://fietkau.software/qr today. 🙂
It has two fun new shape styles, a bunch of added logos (👋 @npub1gq5…qcul @npub1tuu…mx44 @npub1fh7…ee83 @npub12r3…zz58 and more), some advanced options for turbo nerds, and irregularly shaped logos now get better cutouts.
I think this covers most of the feature requests I've received. 😀
#qr #qrcode #webdev #javascript

2024-08-31 08:46:21 UTC

I finished another #webdev side project and built the QR code generator of my dreams: :fietkau_software: https://fietkau.software/qr
* It's instant, purely client-side, and has no ads or upsells.
* It has a variety of color, shape, and logo embedding options.
* There's PNG and SVG export.
The included logo selection is, let's say, "opinionated" and features lots of familiar faces if you enjoy federated social platforms. 😄
Here are a few example QR codes that all lead back to my Mastodon profile.
https://fietkau.social/system/media_attachments/files/113/055/701/707/941/082/original/1050521eed4f7d6e.png
https://fietkau.social/system/media_attachments/files/113/055/702/004/534/614/original/d06b57ebe0356ada.png
https://fietkau.social/system/media_attachments/files/113/055/702/539/381/601/original/d9fdb1951305618b.png

2024-08-28 18:05:16 UTC

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Latest info AFAIK: https://oisaur.com/@renchap/112299860209222424

2024-08-18 20:16:57 UTC

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Yeah sorry, I misunderstood what you meant. It's possible to run ActivityPub on shared hosting, but I'm not aware of any mature projects. @npub1x59…gect has a barebones demo server that proves the concept: https://gitlab.com/edent/activitypub-single-php-file

2024-08-18 11:46:38 UTC

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GoToSocial has support for environments with limited hardware resources as one of its goals. There's also snac which is another order of magnitude tinier.

2024-06-10 14:45:49 UTC

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Found some discussion on the Discord, see attached. (I hope this is okay to share @npub1zu5…pytj)
The safe assumption is the bottleneck is engineering capacity. Incidentally @npub1zu5…pytj is probably the right person to talk to if you want to offer your skills, but I worry progress would be limited by available developers more than by UX design.
https://fietkau.social/system/media_attachments/files/112/592/844/985/631/452/original/8664f8e4ab6df9a6.png