Free developer tools that run entirely in your browser. Generate UUIDs and SHA-256 or MD5 hashes, convert Unix timestamps, turn JSON into CSV, encode images as Base64 and build cron expressions without installing anything or sending data to a server.
In This Guide
Quick picks
Not sure where to start? These are the tools people use most in this category.
| I want to | Use this tool |
|---|---|
| Generate a UUID | UUID Generator |
| Hash a string | SHA256 and MD5 Generator |
| Convert a Unix timestamp | Unix Timestamp Converter |
| JSON to CSV | JSON to CSV Converter |
Encoding and data
5Hashes, IDs and format converters.
Time and scheduling
2Timestamps and job schedules.
Testing and compliance
1Test data and checklists.
Frequently asked questions
Is my data uploaded?
No. These tools use JavaScript in your browser, so your input stays on your device.
Which UUID version is generated?
The UUID generator creates random version 4 UUIDs in your browser.
Should I use MD5 for passwords?
No. MD5 and plain SHA-256 are not suitable for storing passwords. Use a dedicated password hashing algorithm such as Argon2 or bcrypt.
Do the tools work offline?
Once a page has loaded, most tools keep working without a connection.
How we build and check these tools
Every tool is built by hand by the Tools Veria Editorial Team, tested with worked examples and checked against official guidance. Read our editorial policy to see how we review figures when rules change. Key sources for this category:
Explore more categories
Browse all tools or read our practical guides.