Delete Integer Digits
Remove specific digits from every integer in a batch with preserve-empty + leading-zero modes. BigInt support for huge numbers. Free, offline, client-side, instant.
Strip specific digits (e.g. all 0s) from every integer in a batch. Example: input 1230, delete 1 → 230.
How to Use Delete Integer Digits
- Paste integers (newline / comma / semicolon-separated). Negative integers OK; the sign is preserved.
- Enter the digits to delete. Examples:
3(just 3s),0,5,9(multi-digit), or059(no separator). Non-digit characters in the spec are silently ignored. - Pick the output separator (newline / comma / space).
- Tick Preserve at least one digit to keep
0when every digit was deleted (otherwise: empty line in output). - Tick Preserve leading zeros to keep results like
00instead of stripping to0. Useful for fixed-width IDs. - Live preview updates after 200 ms. Ctrl+Enter recalculates manually.
- Stats card shows processed / digits deleted / unchanged (no match) / fully emptied counts.
Frequently Asked Questions
How does this differ from “separate-integer-digits”?
This tool (delete-integer-digits): removes ALL occurrences of the specified digit(s) from each integer. Input 1230 with delete 1 → 230 (single output integer, smaller). separate-integer-digits: inserts a separator between every digit. Input 1230 with separator space → 1 2 3 0 (one integer’s digits, spaced out). They’re different operations. The original FAQ confused the two by being copy-pasted.
How does the digits-to-delete spec parse?
The tool extracts every 0-9 character from your input, ignoring everything else. So 3, 3,, 0,5,9, 059, 0 5 9, "0,5,9", delete 0 and 5 and 9 all parse identically to {0, 5, 9}. Duplicate digits in the spec are coalesced.
What happens to negative integers?
The sign is preserved; the digits are filtered from the absolute value. -1230 with delete 1 → -230. If all digits get deleted from a negative integer (e.g. -999 with delete 9) AND preserve-one is on, the result is 0 (not -0, since negative zero is meaningless for integers).
What’s preserve-leading-zeros?
By default, leading zeros in the result are stripped so the output looks like a normal integer. 120 with delete 1 → 20 (would-be 20, no leading zero anyway). 1001 with delete 1 → 00 stripped to 0. With preserve-leading-zeros on, 00 is kept as-is. Useful for fixed-width ID fields, ZIP codes, account numbers, anything where the digit-count matters for downstream systems.
What’s BigInt support?
JavaScript’s native Number type loses precision above 2⁵³−1 ≈ 9 × 10¹⁵. For integer-digit work we only manipulate string representations – so BigInt isn’t strictly needed for correctness (since we never do arithmetic). But validation uses strict regex ^-?d+$ which works regardless of magnitude. The “BigInt demo” sample shows 21-digit numbers being handled correctly. If you paste a 100-digit number, the tool still works exactly.
What does the Stats card show?
Processed: how many integers were successfully parsed and processed. Digits deleted: total count of digits removed across all integers. Unchanged: integers that contained NO digits matching the deletion spec (passed through identical). Fully emptied: integers where ALL digits got deleted (output is empty or “0” depending on preserve toggle). Useful for sanity-checking “did the rule actually match anything?”
Why are some lines blank in the output?
That’s intentional – those are integers where every digit got deleted AND preserve-one was off. The blank line preserves the count of integers so positions match the input. Turn on preserve-one to convert blanks to 0 instead.
What about input like “abc 42”?
Strictly validated. The integer-token regex is ^-?d+$ – must be entirely digits with optional leading minus, no spaces or other characters. Tokens like abc, 4.2, 1,000, 42 hours are silently skipped (the diagnostic chip mentions how many tokens were skipped when non-zero).
Is my data secure?
Yes. All processing happens in your browser. Your integers never leave your device. Download is generated in-memory and offered locally.