Dev Tools · 51 microapps
51 dev tools.
Faster than your terminal.
JSON formatter, Base64, regex tester, UUID, password generator, QR reader, cURL builder — every utility you'd npm-install if it weren't easier to paste. All free, all browser-based, all data stays local.
Most popular
The 8 dev tools we open every day
JSON Formatter
Format and validate JSON data
Base64 Encoder/Decoder
Encode and decode Base64 strings
Regex Tester
Test and debug regular expressions
UUID Generator
Generate random UUID v4 identifiers
Password Generator
Generate secure random passwords
QR Code Reader
Scan and decode QR codes from images
URL Encoder/Decoder
Encode and decode URLs
Curl Builder
Build cURL commands from a URL
Format & convert
JSON, CSV, HTML, Markdown — clean it up, switch it over.
Encode & decode
Base64, URL, HTML entities, binary, number bases.
Base64 Encoder/Decoder
Encode and decode Base64 strings
URL Encoder/Decoder
Encode and decode URLs
HTML Encoder/Decoder
Encode and decode HTML entities
Binary Decoder
Decode binary code (8-bit ASCII bytes) into readable text — accepts spaces, commas, or no separators
Text to Binary
Convert text to binary code
Number Base Converter
Convert between binary, decimal, hex, octal
Hashes & IDs
MD5, SHA-256, UUID. The cryptographic basics.
CSS & layout
Animation generator, unit converter, REM/PX.
Debug & build
Regex tester, cURL builder, QR reader, slug generator, random IP.
Secrets & credentials
Generate strong passwords, UUIDs, hashes — all local.
Why we built 51
You shouldn't have to think about whether your secrets are leaving the browser.
Most dev-tool sites are a single tool surrounded by Carbon ads, a Patreon banner, and a "buy me a coffee" button. The tool works. The page is hostile. And the worst ones — the ones that take your JWT or your API response or your config file — quietly send it to a server before they format it.
JsonFormatter.org and similar sites are useful and we're not here to dunk on them. But we built our own because we wanted three guarantees nobody else makes: everything runs locally, nothing is logged, and nothing is uploaded. Your tokens stay yours. Your hashes stay yours. Your CSV stays yours.
51 dev microapps. One job each. Format JSON. Decode Base64. Generate a UUID. Test a regex. Build a cURL. Open the page, do the thing, close the tab. Tokens never leave the browser.
Speed
Faster than `pbpaste | jq`
No round-trip to a server. JSON formatter, Base64, regex — every transformation runs in WASM or pure JS. The result appears as you type.
Privacy
Tokens, hashes, JWTs stay local
Every encoder, decoder, and hash generator is local-only. We log zero requests. There is no telemetry on what you paste in. Sign-up is optional and never required to use a tool.
Honest
No "Premium API" upsell
We're not building a SaaS for dev tools. The free tools stay free. Members get clean pages and AI helpers at near-cost. That's the whole offer.
Other shelves
Microapp has six more shelves. Walk down them.