Checked on 21 September 2026
When an MP3Juice download fails: what the message means
A conversion that stops leaves one line of text behind, and that line names the step that gave up. How to read it, what the two numbers after “Code” stand for, and where a finished file hides on a phone.
In brief
Everything below describes the converter on this domain: its status line, its error codes and the links it turns down. If the download stopped on some other page carrying the MP3Juice name, none of it applies. The short version: the first number in a failure message is the step that stopped, 429 means wait a minute, and a finished file is in your browser's own download list.
First: which page actually failed?
Check the address bar before anything else. The converter described here runs at misjaprogramowanie.pl. If the box you pasted into was on some other address, this page is not the one that stopped, and we can only describe the code we run ourselves.
misjaprogramowanie.pl is not connected to MP3Juice, MP3Juices or any site using the name.
So: if the line you saw sat under a box you pasted a link into on this domain, and read something like Conversion failed — Code: 3.502
, keep reading. If it appeared under a field where you typed a song title, you were somewhere else — there is no song-name search here, only a link box — and the place to start is which MP3Juice you were on.
What the status line here is telling you
One line under the input is where this page says what is happening. It opens with Preparing MP3 · 192–320 kbps (or Preparing MP4 · up to 1080p), then initializing conversion, and then it steps through four stage names in this order: checking video, extracting video, converting video, completed. The bar underneath fills as those steps go by; while it waits on a step whose length is not known yet, the bar slides instead of filling.
Two things change that line mid-run. Once the video's own title comes back, it is put in front of the step, so you read Title · converting video — confirmation that the right video is being worked on, not a fault. At the end you get MP3 ready — your download is starting, which is the hand-off to your browser.
If the line sits on one step for a while, nothing has failed yet. A failure is not silent: the line is replaced by the message below, and the buttons come back to life.
What we did here, and what we did not do. Every string, code and limit here was read on 21 September 2026 out of the script this page loads, /js/app.js. There is no third-party statement on this page: we did not test another page carrying this name, so we do not describe one.
“Conversion failed — Code”: what the two numbers mean
A run that ends early replaces the status line with one sentence in this shape: Conversion failed — Code: 2.403
. The first number is the step that stopped — 1 signing in, 2 starting the job, 3 converting, 4 following progress. The second is what that step reported back. Four of them come from this page's own script; any other number is passed straight through from the step that stopped.
| Code | What it means | What to do next |
|---|---|---|
| 1.0 | The first step got nothing usable back, so the run never began. | Press the button again. If every link ends at 1.0, changing the link will not help — try again in a few minutes. |
| 2.403 | The job was refused while it was being set up. | Send it again: every press starts the run from scratch, so there is nothing here for you to reset. |
| 429 | The rate limit: too many conversions in a row. | Wait a minute or two, then send the same link again. Nothing is wrong with the video or the link. |
| 502 | The step ran, but came back with nothing this page could use. | Try the link once more. If it stops there twice, try a different video to see whether it is the link or the run. |
429 and 502 can follow steps 2, 3 and 4, so you may see 3.429 or 4.502; step 1 only ever reports 1.0. The first number tells you how far the run got, nothing more.
Links nobody can convert here
This page reads one thing out of whatever you paste: an eleven-character video id. It finds one in youtube.com, m.youtube.com, music.youtube.com and youtu.be addresses — watch?v=<id>, /shorts/<id>, /live/<id> and /embed/<id>. Anything without an id of that shape is turned down before a run starts, with a sentence saying the link does not look like a YouTube video. There is no code to read in that case, because nothing started.
That covers most of what people bring here by accident: a playlist address, a channel page, an @handle, a page of search results, a shared message with words around the link. Paste the address of the one video instead — on a phone, Share → Copy link on the video gives you exactly that.
A video YouTube will not hand to anyone is a different case. Private, deleted, age-restricted and region-locked videos all have a perfectly good id, so the run starts, and what comes back is a code rather than a file. Retyping the link changes nothing: the limit is on the video.
Where the file went, on iPhone and on Android
When the line reaches completed and then MP3 ready — your download is starting, this page's part is over. The file goes to your browser, and the browser decides where to put it; nothing is kept here for you to collect later. The one thing this page sends at that moment is a short note to api.misjaprogramowanie.pl recording that a download started.
On an iPhone, Safari asks once whether to download, then saves the file to Files → Downloads on the device — or to iCloud Drive → Downloads, if that is where Safari is set to put things. The quick route back is the download arrow in Safari's toolbar, which opens that list.
On Android the file lands in the Download folder, and a notification appears when it finishes. If the notification has gone, open your browser's downloads list, or your phone's file manager and then Download. An MP4 saved this way sits with your other files rather than in the photo gallery until you move it.
If you came here for a converter
If you came for the file rather than the explanation: paste one YouTube link, press MP3 for 192–320 kbps or MP4 for up to 1080p, and the status line described above is the one you will be reading. Enter converts to MP3, Esc cancels a run.
Open the converterQuestions
Why does it say 429?
429 is the rate limit, and it means too many conversions in a row. Wait a minute or two, then send the same link again. Reloading straight away does not help, and there is nothing to fix at your end.
Why did the file not appear?
If the line reached completed, the file left this page. Open your browser's own download list first: on an iPhone the arrow in Safari's toolbar, on Android the notification or the Download folder. If it never reached completed, you have a code instead, and the table above reads it.
Is MP3Juice down?
This page is not down; you are reading it. If a different address carrying the name gave you nothing today, that is another site with its own uptime, and we cannot see it from here. What we can show you is what each address answered on 21 September 2026.