Developer tools
Developer Tools. Fast, Simple, Private.
Format JSON, decode JWTs, test regex, convert colors, and more. Work stays in the browser. No account.
27 live tools · local · private · no signup
Popular Tools
All toolsJSON Formatter
Pretty print and tidy JSON in your browser.
JSON
JSON Validator
Check JSON syntax and inspect document structure.
JSON
JSON Minifier
Remove whitespace and shrink JSON payloads.
JSON
JSON to CSV
Turn JSON arrays into CSV for spreadsheets.
JSON
Base64 Encoder
Encode and decode Base64 in the browser.
Encoding
URL Encoder
Encode and decode URL components.
Encoding
JWT Decoder
Inspect JWT headers and payloads locally.
Security
UUID Generator
Generate RFC UUID values in the browser.
Generators
Browse by Category
JSON
Format, validate, minify, and convert JSON without leaving your browser.
4 tools
Encoding
Base64, URL, and HTML entity encoders and decoders.
3 tools
Security
JWT inspection, hashing, UUID generation, and password generation.
3 tools
Text
Word counts, diffs, lorem ipsum, and other text utilities.
3 tools
Web
QR codes, color conversion, and Markdown preview.
3 tools
Formatting
SQL, HTML, CSS, and JavaScript formatters.
4 tools
Images
Compress and resize images locally in the browser.
2 tools
Generators
IDs, passwords, lorem text, and other generators.
1 tool
Testing
Regex testing and text comparison.
2 tools
Time
Unix timestamps and cron expressions.
2 tools
Why Alphzen?
Free
Use the tools without an account, trial, or usage cap invented for marketing.
Fast
Pages stay light. The editor is the product, not a shell around ads.
Privacy-focused
JSON and other payloads are processed in your browser whenever the tool can run locally.
No signup
Arrive from search, use the tool, leave. Nothing here requires a profile.
Mobile-friendly
Controls are sized for thumbs. Editors stack on small screens instead of overflowing.
Developer-focused
Errors include line numbers. Copy and download actually work. No fake results.
Latest Developer Guides
All guides2026-08-31
Lossy vs lossless image compression in the browser
Canvas JPEG and WebP shrink photos by discarding detail. PNG re-encoding is not pngquant. Know the difference before you hit download.
2026-08-30
A Markdown preview should not execute HTML
Previewing Markdown by injecting raw HTML is an XSS gadget. Here is the safer model: parse a subset and render elements.
2026-08-29
Cron expressions explained (Unix five fields)
What each cron field means, Sunday as 0 or 7, and why Quartz is not Unix crontab.
27 live tools