Drop an MP3. Any size.
safe · secure · no server · works offline · fast
…or just start typing at the cursor.
↓ scroll for about & FAQsafe · secure · no server · works offline · fast
…or just start typing at the cursor.
↓ scroll for about & FAQOmniViewer opens an MP3 right in your browser. Drop the file and you immediately get its raw content and a hex view with offsets and an ASCII panel — the fastest way to look inside an MP3: the ID3 tag block at the top, the MPEG audio frames after it, embedded album art bytes. There is no upload and no server; the page reads only the bytes it needs to paint your screen, so even a multi‑gigabyte recording opens instantly and privately.
ID3 magic at offset 0 and the FF FB-style frame sync bytes where the audio startsThe METADATA tab reads and rewrites the ID3v2 tag — edit the title, artist, album and more, then download a re-tagged copy (the audio is never re-encoded). Need a test file? The MP3 generator builds a valid, silent MP3 of any size — up to 2 GB — with the MPEG version, sample rate and ID3 tags you choose, streamed straight to disk (or one tiny tag-less frame with Smallest possible). And if you want to understand what you're looking at, read the anatomy of an MP3 file: the frame header for every MPEG version, ID3 tags and the Xing VBR header, byte by byte.
Playback with playlists (drop several MP3s at once), batch metadata cleaning and a waveform view are rolling out, powered by the same engine as fastjsonviewer.com and hugecsv.com. OmniViewer opens every file format — MP3 is one of the formats with dedicated tooling.
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.