Inspect your MP3 in hex.
safe · secure · no server · works offline · fast
…or just start typing at the cursor.
safe · secure · no server · works offline · fast
…or just start typing at the cursor.
Drop an .mp3 and OmniViewer shows its exact bytes in a
hex view: offsets, hexadecimal and a decoded ASCII panel. Spot
the ID3 magic at offset 0, read how large the tag block is, and
find the FF FB-style frame sync where the audio actually begins.
It reads only the bytes on screen, so a multi-gigabyte recording opens instantly.
Hex is where you diagnose a file no player will touch: a corrupt or oversized ID3 header, unexpected padding, or bytes that reveal the file isn’t really an MP3 at all. The same drop also plays the audio, edits the tags, reports stats, and confirms the format from the content rather than the extension.
It’s one lens on OmniViewer’s MP3 File Viewer — Inspect MP3 Audio Locally: drop a file and every tab is one click away. OmniViewer opens every file format, entirely in your browser — no upload, no server.
No. OmniViewer is a static page with no server-side processing: your MP3 is read directly by your browser and never leaves your computer.
MP3 (MPEG-1/2 Audio Layer III) is a compressed audio format. The file is a sequence of independent audio frames, each starting with a sync header, usually preceded by an ID3 tag block holding the title, artist, album and cover art.
That is the ID3v2 tag block: metadata (title, artist, album, artwork) stored before the audio frames. In the hex view you can see exactly how large it is and where the audio data begins.
OmniViewer identifies the format from the content — the ID3 header or the MPEG frame sync bytes — not from the file extension, so a renamed or mislabelled file is detected for what it actually is.
Effectively unlimited. OmniViewer only reads the bytes needed to paint the screen; the engine behind it has been tested in-browser with a 40 GB file.
Yes. The METADATA tab reads the ID3v2 tag and lets you edit the title, artist, album, year and more, then download a re-tagged copy — the audio is never re-encoded, so it stays lossless. Playback with playlists is still rolling out; everything stays local either way.
Yes. The MP3 generator at /s/mp3/generator builds a valid, silent MP3 of any size up to 2 GB — you pick the MPEG version, the sample rate and the ID3 tags — and streams it straight to disk without uploading anything. A "Smallest possible" button emits the tiniest valid MP3: a single tag-less frame.