Free MP3 checker
Free Audiobook Audio Spec Checker
Upload one MP3 and get a technical readiness report for common audiobook retailer delivery specs. No credits are used.
MP3 only
100 MB max
Login required
No charge
Already know your files need work — or checked one and it failed? You can skip straight ahead and fix your whole audiobook →
Check an MP3
The uploaded file is analyzed, then removed from temporary storage.
Upload status
Ready
0%
Waiting for an MP3...
Readiness report
Audio checked
This file needs fixes — and it's only one chapter
You checked a single file. If it isn't to spec, the rest of your audiobook almost certainly has the same issues. Upload your complete audiobook and we'll re-master every file to retailer audio specs — priced by length, shown before you pay.
Fix my whole audiobookWhat gets checked
Audio levels
Average loudness, peak level, and quiet-room indicators.
Encoding
MP3 format, sample rate, bitrate, channel count, and file length.
Room tone
Opening and closing silence ranges commonly expected for audiobook delivery.
This is a technical check only. Retailer policies, narration eligibility, chapter ordering, credits, samples, and full-book consistency still need human review.
