Online Tool Store
Hex Editor
Open a small file to view its raw bytes as a hex/ASCII grid, edit individual byte values, and download the modified file.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Sample bytes shown below — choose your own file (under 64 KB works best) to replace it. Files never leave your browser.
| Offset | Hex | ASCII | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Click a hex byte to edit it.
How it works
- Choose a file — a sample is loaded automatically so you can see the grid immediately.
- Each row shows 16 bytes: the offset on the left, the hex value of each byte, and its ASCII interpretation on the right (a dot for non-printable bytes).
- Click a hex byte to change its value, then use "Download edited file" to save the modified bytes as a new file.
Reading the grid
Each byte is a value from 0 to 255, shown as two hex digits (00–FF). Offsets are shown in hex by default — switch to decimal with the dropdown above the grid if that's easier to cross-reference with another tool. The ASCII column shows the printable-character interpretation of each row's 16 bytes, which is how you spot text embedded inside binary data.
FAQ
Is my file uploaded anywhere?
No. The file is read with the browser's File API and every byte stays in your tab's memory. Nothing is sent to a server — closing the tab discards it completely.
How large a file can I open?
The editor accepts files up to 2 MB and renders the first 4,096 bytes (256 rows) in the grid for performance. Larger files can still be downloaded after editing, but only the visible window is shown.
How do I edit a byte?
Click any hex value in the grid — you'll be prompted for a replacement value from 00 to FF. The ASCII column and the byte itself update immediately, and the download reflects every edit you've made.
How we compare
| Feature | Online Tool Store | Desktop hex editor (HxD, etc.) | 010 Editor |
|---|---|---|---|
| No install — runs in the browser | ✓ | ✗ | ✗ |
| Files never leave your device | ✓ | ✓ | ✓ |
| Free, no license key | ✓ | ✓ | ✗ |
If you just need to peek at or nudge a few bytes without installing desktop software, this runs the same read/edit/download loop entirely in your browser.