Free Random Code Generator for Digits, Letters, Prefixes, Coupons, and Test IDs
Create non-sensitive random codes for coupons, test data, reference IDs, classroom exercises, and placeholders. Choose character sets, length, count, prefixes, and separators.
Generate random codes
How to use this tool
1. Prepare the input
Clean the list, choose filters, or set the generation rules before running the tool.
2. Generate once clearly
Run the randomizer and review the result before changing settings or generating again.
3. Save useful output
Copy, download, print, favorite, or keep a local history entry when you need a record.
12 useful features
2–64 character bodies
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1–100 code batches
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Uppercase letters
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Lowercase letters
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Digits
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Ambiguous-character filter
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Custom prefix
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Optional grouping separators
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Unique batch set
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Copy all codes
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Download all codes
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Local history
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Randomization reference
| Need | Best approach | Important check |
|---|---|---|
| Choose one option | Picker, wheel, weighted choice | Confirm every eligible option is represented correctly. |
| Order every entry | Full shuffle or bracket seeding | Decide whether duplicates count as separate entries. |
| Choose several | Sample without replacement | Make sure the requested count does not exceed the pool. |
| Generate content | Filtered internal dataset or templates | Review tone, context, and suitability before using output. |
Quality checklist
0 / 5 complete
Quick knowledge check
What should you confirm before using a randomized result?
Microlearning guide
Random does not mean balanced
Small samples can look uneven. Fair random processes still produce streaks and clusters.
Define replacement
Removing a result creates sampling without replacement; keeping it allows the same option to appear again.
Match the tool to the stakes
These browser tools are for everyday choices, games, learning, and brainstorming—not audited lotteries or security-critical decisions.
Related tools
Frequently asked questions
Can I make four-digit codes?
Yes. Turn off letters, keep digits enabled, and set the code length to four.
Can I mix letters and numbers?
Yes. Enable any combination of uppercase, lowercase, and digits.
What does avoid ambiguous characters do?
It removes characters such as 0, O, 1, I, and lowercase l that are easy to confuse visually.
Are these safe as passwords or security tokens?
No. Use the generator for non-sensitive identifiers, coupons, fixtures, or test data—not secrets or authentication credentials.
Can I generate multiple unique codes?
Yes. Each batch is stored in a Set so duplicate strings are discarded during that generation run.