Something failed. Find your symptom below, get the cause, apply the fix. Sixty seconds of diagnosis beats ten minutes of retrying blindly.
If it still fails, match your symptom to a guide:
| Symptom | Likely cause | Guide |
|---|---|---|
| Conversion never starts or errors immediately | Private, deleted, restricted, or region-blocked video; bad link | Why won't my video convert |
| MP3 downloads but has no sound | Muted source, stream mismatch, or player issue | No sound in my MP3 |
| MP3 won't play on my device | Codec support, transfer issue, or corrupt download | MP3 file won't play |
| Long video fails or times out | Length limits and server timeouts | Video too long to convert |
| Download starts then fails or the file is broken | Connection drops, partial downloads | Download keeps failing |
Sometimes the cause is upstream: YouTube changes its backend and converters need hours to adapt, or a video's uploader disabled embedding. If one specific video fails while others convert fine, the problem is that video. Wait a few hours and try again before assuming the converter is broken.
More fixes: slow conversion, MP3 has no sound or cuts off, invalid URL error.
Our brand troubleshooting guide at YouTube to MP3 not working covers the same fixes with CnvMP3-specific notes.
Nine times out of ten it is the video, not the converter: private or deleted videos, age restrictions, region blocks, or disabled embeds. Open the link in YouTube first.
Confirm the video is public and playable, check the link is complete, try incognito, and pause aggressive ad blockers for the page.
Sometimes. Aggressive blockers can stop the scripts behind the convert and download buttons. Whitelist the site or pause the blocker for the page.