17 Developer tools that open instantly and get out of the way.

Paste, get your answer, close the tab. Every tool runs in your browser, so there is no upload and no round trip — and no signup, no cookie banner, and nothing between you and the input.

the tools · 17 live

Network

CIDR Calculator ipv4 · ipv6 · split · contains

Auth & security

JWT Debugger header · payload · signature Hash Generator sha-256 · file or text · hmac

Data formats hub →

JSON to YAML block style · 1.1-safe · comments YAML to JSON multi-doc · 1.1 vs 1.2 · anchors JSON to CSV flatten · column union · Excel-safe CSV to JSON typed or text · headers · ragged rows UUID Generator v4 · v7 · bulk · decode

SQL

SQL Formatter 8 dialects · keyword case · token check

Text hub →

Base64 Encode / Decode text · files · base64url URL Encode / Decode component · full URI · form data Text & JSON Diff side-by-side · json-aware · unified HTML Entity Encode / Decode named · numeric · minimal JSON String Escape / Unescape escape · unescape · embed-safe Case Converter camel · snake · kebab · const

Time

Unix Timestamp Converter epoch · ISO 8601 · any timezone Cron Expression Simulator next runs · timezone · dst

Instant, and offline

Nothing round-trips to a server, so the answer is there as you type. Load a tool once and it keeps working with the network off.

No signup, no popups

No account, no cookie banner, no newsletter modal, and no ad unit between you and the input.

Your paste stays in the tab

The browser is instructed to block every request these pages could make — which is unusual, and checkable in ten seconds.

See how to check it →