Is this based on Math.random()?
No. It uses crypto.getRandomValues(), rejection sampling to avoid modulo bias, Unicode-aware character counting, and batch deduplication.
Aa
Security
Random String Generator
Create 1–100 unique strings with 1–4,096 Unicode characters each, using an explicit alphabet, unbiased Web Crypto sampling, and a visible entropy estimate.
● Web Crypto / unbiased sampling
Generate configurable secure random strings
Choose an explicit alphabet, length, and batch count. Values are sampled independently and deduplicated within the current batch.
≈ 192.0 bits per string · 64 characters · meets a common 128-bit token target
Random string output
Random strings will appear one per line.
Entropy assumes uniform independent sampling from the browser's secure random source. Clearing this page cannot remove an existing clipboard copy.
Three simple steps
How to use Random String Generator
- 01
Choose URL-safe, alphanumeric, lowercase hex, or 2–256 unique custom characters.
- 02
Set length and batch count; review the per-string entropy estimate.
- 03
Generate locally, then copy or download the current unique batch.
Privacy first
Tool data and site requests stay separate
Tool input and results are processed in temporary state for the current page. The TabPebble application does not send them to a server, write them to a database, or create processing history. Pages and code still load through ordinary network requests. Your browser may restore a tab, while downloads and clipboard copies remain on the device until you remove or replace them.
- No tool-task upload
- No account
- No processing history
FAQ
Frequently asked questions
Is this tool free?
Yes. Core tools are free to use and do not require an account.
Does tool input go to a server?
No. The TabPebble application performs the tool task in your browser and does not put input into site requests; ordinary page and code requests still reach the hosting service.