Hex Dump Viewer & Editor (with Data Inspector)
Display binary data as a classic hex dump (offset | hex bytes | ASCII gutter) with in-place editing, byte insert/delete with undo, search by hex bytes / ASCII text / regex, goto offset, multi-format display (hex / decimal / binary / octal), a data inspector decoding int8/16/32/64 (signed & unsigned), float32/64, LEB128, and strings (ASCII / UTF-8 / UTF-16) at the cursor in both endiannesses, and file import via ArrayBuffer. 100% client-side, nothing uploaded.
About Hex Dump Viewer & Editor (with Data Inspector)
Display binary data as a classic hex dump (offset | hex bytes | ASCII gutter) with in-place editing, byte insert/delete with undo, search by hex bytes / ASCII text / regex, goto offset, multi-format display (hex / decimal / binary / octal), a data inspector decoding int8/16/32/64 (signed & unsigned), float32/64, LEB128, and strings (ASCII / UTF-8 / UTF-16) at the cursor in both endiannesses, and file import via ArrayBuffer. 100% client-side, nothing uploaded. Everything runs locally in your browser — your data never leaves your device.
How to use
- Enter your input in the tool above.
- Adjust any options to your preference.
- Use the Copy or Download buttons to save the result.
- Everything happens locally — your data never leaves your browser.
FAQ
What does the hex dump viewer do?
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.
What does the data inspector show?
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.
Can I import a real file?
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.
How does search work?
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.
What extra features does this tool have compared to other hex viewers?
(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.
Related tools
.bashrc / .zshrc Alias & Config Manager
Build shell aliases, functions, exports, and PATH edits in a visual editor, then export a clean, commented .aliases file sourced from both .bashrc and .zshrc — with shadowing detection against shell builtins and common CLI tools, function suggestions when args are needed, starter packs (git, docker, kubectl, navigation, safety, ls, dev, devops, data science), import of existing rc files, dedupe, history (localStorage), and shareable URL. 100% client-side.
Add / Subtract Date Calculator
Add or subtract years, months, weeks, days, hours, minutes and seconds from a starting date/time. Calendar-day or business-day mode with custom weekend + holiday list. Month-end policy toggle (clamp to last day vs overflow). Repeat/series mode (e.g. every 2 weeks x 10) with CSV export. Shareable URL. 100% client-side.
Age Calculator
Calculate exact age from a birth date in calendar years/months/days (no negative-day bugs) plus totals in months/weeks/days/hours/minutes/seconds. Next-birthday countdown with weekday. Feb-29 birthday policy toggle. Milestones (1,000 days, 10,000 days, 1 billion seconds). Zodiac sign + Chinese zodiac. Age gap comparison. Shareable URL. 100% client-side.