Online Counter
Use +1, +5, +10 or a custom positive integer increment. Directly set a signed integer between −9,007,199,254,740,000 and 9,007,199,254,740,000; keep up to 10 recent operations.
All data stays on this device.
Last 10 operations
A QUICK WALKTHROUGH
How to use this tool
- Choose +1, +5, +10 or enter a positive whole-number custom increment.
- To replace the count, enter a signed integer and select Set value.
- Copy the count or export CSV. Clear history removes the operation list while preserving the count.
Integer bounds
Count values stay between −9,007,199,254,740,000 and 9,007,199,254,740,000. Increments must be positive safe integers; fractional values and operations that overflow the counter bound are rejected.
Local persistence and exceptions
The count and last 10 operations use validated, versioned localStorage in this browser and are restored when valid. Nothing is uploaded. If reading or writing storage fails, changes remain only in page memory for this session; refreshing or leaving can lose them. Invalid stored data is not restored.
Four-column CSV
CSV contains exactly four localized headers: Time, Action, Amount and Counter value. Time is an ISO UTC timestamp. Amount is the added number for increments and the assigned target for Set value. The export contains only the current last 10 operations.
GOOD TO KNOW
Common questions
Can I decrease or reset the count?
Use Set value to enter a smaller signed integer or zero. Increment controls only add positive integers.
Does Clear history reset the count?
No. It empties the history and saves the current count without those operations; downloaded CSV copies are unaffected.
What if local storage or copying is unavailable?
Storage failures switch to session-only page memory; copy the count or export CSV before leaving. Clipboard failures show an unavailable message, so you can select the displayed count and copy manually.