Question 1

What does the hex dump viewer do?

Accepted Answer

Drop or paste any binary data and the tool renders a classic three-pane hex dump: byte offset on the left, the hex bytes in the middle (grouped 2-per-byte, configurable bytes per line of 8 / 16 / 32), and an ASCII gutter on the right where non-printable bytes (outside 32-126) are shown as dots. You can edit any byte in place by clicking the hex or ASCII cell, insert or delete bytes, undo / redo any edit, search by hex bytes / ASCII text / regex, jump to any offset (decimal or hex), and read a live data inspector that decodes every numeric type and string encoding at the cursor.

Question 2

What does the data inspector show?

Accepted Answer

At the current cursor offset, the inspector decodes the next bytes as: int8 / uint8, int16 / uint16, int32 / uint32, int64 / uint64 (both big-endian and little-endian), float32 (single) and float64 (double) in both endians, LEB128 (unsigned and signed), and strings in ASCII / UTF-8 / UTF-16 (BE and LE) up to a configurable length. The decoded values update instantly as you move the cursor or edit bytes.

Question 3

Can I import a real file?

Accepted Answer

Yes. Use the Import file button and pick any binary file — it is read into an ArrayBuffer via the FileReader API, sliced into a Uint8Array, and rendered in the hex grid. Files never leave the browser; there is no upload, no server round-trip, no telemetry. You can also paste hex bytes (e.g. 'FFD8FFE0' or 'FF D8 FF E0') or ASCII text directly into the input box and the tool parses it into bytes.

Question 4

How does search work?

Accepted Answer

Three search modes: (1) Hex bytes — type a hex string with or without spaces ('FFD8FF' or 'FF D8 FF') and the tool finds every match with its byte offset. (2) Text — type ASCII text and the tool encodes it to UTF-8 and searches byte-by-byte. (3) Regex — for flexible ASCII matching. All matches are highlighted in the dump and listed with their offsets; click any match to jump to it. Search runs client-side in pure JS, no server.

Question 5

What extra features does this tool have compared to other hex viewers?

Accepted Answer

(1) In-place byte editing via the hex grid or ASCII gutter (most viewers are read-only). (2) Insert / delete bytes with undo / redo (not just overwrite). (3) Full data inspector: int8/16/32/64 signed & unsigned, float32/64, LEB128 (unsigned & signed), and ASCII / UTF-8 / UTF-16 strings, in both endiannesses. (4) Three search modes: hex bytes, ASCII text, regex. (5) Goto offset (decimal or hex). (6) Multi-format display: hex / decimal / binary / octal at the cursor. (7) Configurable bytes per line (8 / 16 / 32) and byte grouping. (8) Import any file via ArrayBuffer (drag-drop or file picker). (9) Selection checksums (CRC32, Adler32, sum8/16/32, XOR). (10) Export the edited bytes as a new file. (11) History (localStorage, last 20 sessions). (12) Shareable URL with the hex content round-tripped (for small inputs). 100% client-side and offline — your bytes never leave the device.

Hex Dump Viewer & Editor (with Data Inspector)

Hex dump — cursor at 0x0

Edit byte at offset 0x0

Data inspector @ 0x0

Selection checksums (all 20 bytes)

How to use

Hex dump — cursor at 0x0

Edit byte at offset 0x0

Data inspector @ 0x0

Selection checksums (all 20 bytes)