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
Formatador JSON
Formate, valide e minimize JSON
Codificador/Decodificador Base64
Codifique e decodifique strings Base64
Regex Tester
Test and debug regular expressions
UUID Generator
Generate random UUIDs instantly
Gerador de Senha
Gere senhas seguras instantaneamente
Leitor de QR Code
Leia códigos QR de imagens ou da câmera
URL Encoder/Decoder
Encode and decode URL strings
cURL Builder
Build cURL commands visually
Format & convert
JSON, CSV, HTML, Markdown — clean it up, switch it over.
Encode & decode
Base64, URL, HTML entities, binary, number bases.
Codificador/Decodificador Base64
Codifique e decodifique strings Base64
URL Encoder/Decoder
Encode and decode URL strings
HTML Encoder/Decoder
Encode and decode HTML entities
common.toolList.binary-decoder.label
common.toolList.binary-decoder.desc
Text to Binary
Convert text to binary code
common.toolList.number-base-converter.label
common.toolList.number-base-converter.desc
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.