Codeground AI tools

Free developer tools

Epoch converters, JSON/SQL utilities, AI helpers, and more — all free, mostly in-browser, no install. Also explore online playgrounds and Dev Break Arcade.

Time & dates

Epoch ConverterUnix timestamp ↔ date with timezones.Current Unix TimeLive epoch clock in seconds and ms.Timestamp DiffDifference between two timestamps.Date MathAdd/subtract days, business days, ranges.Timezone Meeting PlannerFind overlapping hours across zones.Cron BuilderBuild and preview cron expressions.

Data & formats

JSON FormatterPretty-print and validate JSON.JSON DiffCompare two JSON documents.JSON ↔ CSVConvert between JSON and CSV.Diff & PatchUnified diffs and patches.Protobuf DecoderDecode base64/hex wire format.Log ParserParse and inspect log lines.Base64 EncodeEncode text to Base64.Base64 DecodeDecode Base64 to text.JWT DebuggerInspect JWT headers and claims.

SQL

SQL Query GeneratorBuild SELECT/INSERT/UPDATE/DELETE.SQL FormatterPretty-print SQL.SQL AssistantAI help writing SQL.

AI tools

AI Code DetectorCheck if code looks AI-generated.AI Watermark ToolAdd or strip zero-width watermarks.Resume HumanizerDe-AI-ify resume language.AI Email RewriterRewrite emails in your tone.README GeneratorDraft a project README.

Utilities

Regex TesterTest regular expressions live.Password GeneratorStrong passwords with entropy.UUID GeneratorBulk RFC-4122 v4 UUIDs.QR GeneratorCreate shareable QR codes.Color PickerHex, RGB, HSL color tools.ENV LinterLint .env files.Lucky Draw WheelSpin a random name picker.Speed TestQuick connection speed check.Diagram StudioDraw architecture diagrams.CanvasFreeform drawing board.

Online playgrounds

Run code in the browser — free online compilers and database sandboxes.

PythonOpen playgroundJavaScript / NodeOpen playgroundRustOpen playgroundPostgreSQLOpen playgroundMongoDBOpen playgroundMySQLOpen playgroundTypeScriptOpen playgroundJavaOpen playground