Honest comparison
AudioFetcher vs CnvMP3
Both are ad-free, browser-based and free for single videos, and CnvMP3 has an excellent Trustpilot rating. CnvMP3 allows longer free MP3s (90 minutes against AudioFetcher's 60) and supports several other video sites. AudioFetcher adds original Opus and M4A without re-encoding, FLAC, playlists, chapters, SponsorBlock and MP3 tag editing.
Written by the AudioFetcher team, so we have an interest. Facts about CnvMP3 come from its own site, documentation or linked sources. Last checked September 17, 2026.
Side by side
| AudioFetcher | CnvMP3 | |
|---|---|---|
| Platform | Web app in any modern browser; optional Firefox extension | Web app at cnvmp3.com |
| Install | None | None |
| Account | Not needed for free conversions | Not needed; donation-funded |
| Price | Free for single videos up to 60 minutes. Supporter Pass: $5 one-time for 30 days, no subscription. | Free; accepts donations |
| Ads and pop-ups | None | None |
| Output formats | MP3 (up to 320 kbps, VBR options), FLAC, original Opus, original M4A, MP4 (up to 720p free) | MP3 (96 to 320 kbps options) and MP4 |
| Keeps original YouTube audio | Yes, Opus and M4A are delivered without re-encoding | No Opus, M4A or FLAC option found |
| Length limits | Free: 60 minutes of audio per video, one MP4 per day up to 20 minutes. Supporter: audio up to 12 hours, FLAC up to 2 hours, MP4 up to 60 minutes | The site states MP3 up to 1 hour 30 minutes and MP4 up to 1 hour |
| Playlists | Full playlists and queues of up to 100 links with a Supporter Pass; a free Library Pack of up to 10 items once a day | No playlist or batch support found |
| Extras | ID3 tag editing and embedded cover art (MP3), chapter embedding and splitting, SponsorBlock sponsor removal, subtitles, LRCLIB lyrics file, ordered playlist ZIP | Lists other sites including TikTok, Instagram, Facebook, Reddit, Twitch and X; no tag editor, chapters, SponsorBlock, subtitles or lyrics found |
| Checks before converting | One Cloudflare Turnstile check before a free conversion | Users on Trustpilot have reported occasional security errors |
| Where conversion runs | On AudioFetcher's servers; files are temporary and deleted automatically | On CnvMP3's servers |
What users report
CnvMP3 holds a 4.9 out of 5 rating on Trustpilot from more than 1,400 reviews. The most recent complaints mention security errors and stuck conversions during busy periods, which is typical of a free shared service. One competitor's review measured about 243 kbps of real output when 320 kbps was selected; that is a single vendor test, not a verdict. See our CnvMP3 status page for details.
Choose CnvMP3 if
- Your free videos run between 60 and 90 minutes.
- You also download from TikTok, Instagram, Facebook or Reddit.
- You only need a quick MP3 or MP4 and no extras.
Choose AudioFetcher if
- You want the original Opus or M4A stream, or FLAC, instead of a re-encoded MP3.
- You convert whole playlists, long videos with a Supporter Pass, or videos with chapters.
- You want tags, cover art or sponsor segments handled before download.
Other comparisons
Sources
- CnvMP3 websiteFormats, bitrate options, length limits, supported sites, donation model.
- Trustpilot reviews of CnvMP3Rating and recent reports of security errors.
- ViWizard review (vendor)Measured output bitrate test.
Other tools change often. If something here is out of date, email help@audiofetcher.com and we will correct it.