Hex Byte Viewer
Open any file to see its first bytes as a classic hex dump. Useful for checking magic numbers, debugging binary formats or confirming that a file is what its extension claims.
Key facts
- Category
- Audio & Video
- Price
- Free
- Account
- Not required
- Processing
- In your browser
- Input
- Local files or pasted data
- Platform
- Modern desktop and mobile browsers
What it does
Open any file to see its first bytes as a classic hex dump. Useful for checking magic numbers, debugging binary formats or confirming that a file is what its extension claims.
Inspect the raw bytes of any file as hexadecimal and ASCII.
How to use it
Here is the short version of using Hex Byte Viewer.
- Open a file — Only the first 4 KB–1 MB are read, selectable.
- Read the dump — Offsets, hex bytes and ASCII appear side by side.
- Filter or copy — Search for a value or copy the dump for notes.
Features that matter
What Hex Byte Viewer does well.
- Nothing leaves your device — The work happens in your browser tab. There is no upload endpoint in this app, so your files and text cannot be stored, logged or seen by us.
- No upload wait — You skip the round trip to a server entirely. Results are limited by your own CPU, not by network speed or queue size.
- Free, no account, no quotas — No sign-up wall, no watermark, no daily limit. Optional accounts only exist to save favourites and presets across devices.
Frequently asked questions
Is my file safe to use here?
Yes. This tool runs entirely in your browser using JavaScript. Nothing you paste or open is sent to a server, and the page keeps no copy after you close it.
Do I need to create an account?
No. Every tool is fully usable without signing in. An account only adds saved favourites and reusable presets.
Does it work on a phone?
Yes. The interface is mobile-first with large touch targets and a stacked layout, so it works on phones and tablets as well as desktops.
What is a magic number?
The first bytes that identify a file format, such as %PDF for PDFs or PNG for PNG images. It is more reliable than the extension.
Open Hex Byte Viewer
Try it now — it runs in your browser and needs no account.
Open the tool