Byte Take — Extract a Byte Range
Extract a contiguous slice of bytes from text, hex, or Base64 data by start offset and length, then view the result as text, hex, or Base64. Runs entirely in your browser, no server, no sign-up.
What this tool does
Byte Take extracts a contiguous slice of bytes from your data and returns just that slice — instantly, right in your browser. Give it a Start offset and a Length, and it keeps those bytes and drops everything else. Nothing is sent to a server: it runs locally, works offline, and needs no sign-up.
It works on raw bytes, so it can interpret your input as text, a hex byte string, or Base64, and render the extracted bytes in any of those formats.
How it works
- The input is decoded into raw bytes using the Input format you pick.
- Starting at the Start offset (a 0-based byte position), Length bytes are taken.
- The extracted bytes are shown in the Output format.
Offsets and lengths are counted in bytes, not characters. For plain ASCII text a byte equals a character, but a multi-byte character (like an emoji or an accented letter) spans several bytes — switch the input/output to hex to see exactly where the byte boundaries fall.
Options
| Option | What it does |
|---|---|
| Start offset | The 0-based byte position of the first byte to extract. A negative value counts from the end (-1 is the last byte). Clamped to the buffer. |
| Length | How many bytes to extract from the offset. 0 extracts nothing; a range that runs past the end is clamped. Must be zero or positive. |
| Input format | How to read your input: text (UTF-8), hex (48 65 6c or 0x48656c), or base64. |
| Output format | How to show the slice: text (UTF-8), hex, or base64. Use hex or base64 for binary data. |
Examples
| Input | Settings | Output |
|---|---|---|
Hello, World | start 5 · length 4 · text → text | , Wo |
abcdef | start 0 · length 3 · text → text | abc |
abcdef | start -2 · length 2 · text → text | ef |
00112233 | start 1 · length 2 · hex → hex | 1122 |
SGVsbG8= | start 1 · length 3 · base64 → text | ell |
FAQ
Is it free and private?
Yes — your input never leaves your device, and it keeps working offline once the page has loaded.
Are offsets in bytes or characters?
Bytes. For ASCII text the two are the same, but a multi-byte character spans several bytes. Switch to hex input/output to work at the exact byte level.
What happens if my range goes past the end?
It's clamped — the tool extracts only the bytes that exist and never errors on an out-of-range length.
My output says the bytes aren't valid UTF-8.
Slicing through the middle of a multi-byte character can leave bytes that don't form valid text. Switch the Output format to hex or base64 to view the raw extracted bytes.
How do I grab the last few bytes?
Use a negative Start offset — for
example -4 with length 4 takes the last four bytes.
How is this different from byte drop?
Byte Take keeps the selected range and discards the rest; Byte Drop does the opposite — it removes the selected range and keeps the rest.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool byte-take "Hello, World"New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/byte-take/?input=Hello%2C%20World&start=7&length=5&format=text&output=textMachine-readable descriptor: tool.json — title + parameters JSON Schema for agents.