Shrink large WAV recordings into practical 192 kbps MP3 files for email, playback and sharing. Free with clearly published fair-use limits — no sign-up, no watermarks.
Drop your WAV file here
or click to browse — One file per media job — 100 MB / 10 minute limit
☁️ Server conversion — your file is uploaded securely (HTTPS), converted, and removed from temporary processing storage after the request finishes. Forced-crash leftovers are removed by recovery sweeps. A verified codec/duration report is included on the download page. Which tools upload, and which do not
WAV commonly stores uncompressed PCM audio, which is excellent for recording and editing but disproportionately large for delivery. MP3 makes a lightweight stereo listening copy. The reduction is permanent, so archive the WAV and perform any future editing from that source instead of repeatedly re-encoding the MP3.
This page has a real two-second fixture made from generated motion, colour and tones — no copyrighted clip and no visitor data. Download the source, run it through the tool, and compare it with the expected profile-1.0.0 output.
⬇ Sample input (WAV) ⬇ Verified expected output
| Check | Input | Expected output |
|---|---|---|
| Codecs | pcm_s16le | mp3 |
| Duration | 2 s | 2 s (Δ 0 s) |
| File size | 192,078 bytes | 49,581 bytes |
| SHA-256 | b192ea5a2efce8baebc5837afd2fb19c1c2436b0b933814b602db9ccc0cb8ec5 | 4b61b96caf5f60a1f8bb9a6b06e6f97528c046e5d70f3d686489a111206ad448 |
| Measured time | — | 97 ms in the published environment |
| Validation | Signature + ffprobe | Codec, complete decode and duration: pass |
No confidence score is invented: transcoding is deliberately lossy, so the defensible result is a set of pass/fail structural checks, not “97% accurate.” Your download page exposes the same per-job evidence report as JSON and CSV. See the method, limitations and six-case comparison, or download the anonymous CSV / JSON dataset.
“Accuracy” for this lossy task means the published structural gates below; perceived quality still needs human review of the output.
| Profile | Date | Validation change | Re-test | Result |
|---|---|---|---|---|
| 1.0.0 | 2026-08-16 | Fixed codec profile; EBML DocType / ISO brand checks; rotation-aware dimensions; ffprobe; complete decode; duration tolerance | FH-MEDIA-06 plus the six-profile release gate and adversarial regressions | pass |
WAV most often stores uncompressed PCM audio: every sample is retained, which is excellent for recording, editing and archiving but produces very large files. Creating an MP3 listening copy makes long recordings easier to email, upload and play while the WAV remains the lossless master.
MP3 is the most broadly compatible compressed audio format. Music players, car stereos, browsers, editors and upload services understand it. It is lossy: converting audio to MP3 removes some information to reduce size, so the original recording remains the right master for future editing.
| WAV | MP3 | |
|---|---|---|
| Type | Audio container | Audio |
| Compression | Usually uncompressed PCM | Lossy |
| Typical use | Recording, editing, archival audio | Listening, transcription, sharing |
WAV commonly stores every PCM sample with no perceptual compression. That is the right material for editing, noise reduction and mastering — and an inefficient attachment for someone who only needs to listen. A 192 kbps MP3 can reduce a long recording dramatically while remaining practical across phones, browsers, cars and messaging apps.
The reduction is permanent. Bit depth and ultrasonic detail discarded during MP3 encoding do not return if the file is expanded to WAV later, and multichannel material is mixed to stereo for compatibility. Archive the WAV, listen to dense music and quiet passages in the MP3, and perform future edits from the original rather than repeatedly re-encoding the delivery copy.
Yes — there is no sign-up, payment or watermark. The published safeguards are 100 MB input, a 160 MB output cap, a 10 minute selected-stream limit, an 8 minute request-wide deadline and four jobs per visitor per 10 minutes; they are technical limits, not a paid tier.
Media files are handled one at a time. That makes the documented CPU, memory and cleanup limits enforceable and gives the next file a clean job directory. Finish or clear the current file before adding another.
Yes. Native FFmpeg is too large and resource-intensive for a reliable browser-only conversion, so this tool sends the file over HTTPS to our server. It is limited to 100 MB and 10 minutes and uses an isolated temporary job directory. Normal cleanup removes that directory after success, failure, cancellation or timeout; startup and five-minute sweeps remove a forced-crash leftover once it is older than the request deadline. Media files are never intentionally retained.
You can create a WAV later, but it cannot restore detail discarded by MP3. Converting back only places the compressed sound in a larger lossless container; keep the original WAV as your master.
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