Developer Tools — Free Online Tools

Glowing binary data transforming into structured Base64 character blocks

Base64 Text ConverterEncode and decode text in Base64. Open tool

Neon web address branching into identifier, locator and name components

URL CodecEncode and decode URLs quickly. Open tool

Glowing JSON document with nested objects, arrays and formatting guides

JSON EditorFormat, minify and stringify JSON. Open tool

Data blocks flowing through a cryptographic hash engine into fixed-length fingerprints

Hash GeneratorGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes. Open tool

Split view of a glowing OpenAPI document in YAML next to rendered API endpoints with colored HTTP method badges

Swagger Viewer & EditorView, edit and test Swagger/OpenAPI specs: convert versions, call endpoints and export standalone HTML docs. Open tool

Side-by-side JSON and YAML trees connected by highlighted matching and different fields

JSON & YAML ComparatorCompare fields of two JSON or YAML files: missing on each side and differing values. Open tool

Glowing UUID segments arranged across a distributed network of database nodes

UUID GeneratorGenerate v4, v7 and v1 UUIDs with formatting options. Open tool

Digital clock and timeline flowing from the Unix epoch into modern systems

Unix TimestampConvert dates and times to Unix timestamps. Open tool

Futuristic IPv4 address divided into four binary octets and branching into organized CIDR subnet ranges

IPv4 CIDR CalculatorCalculate subnet ranges, masks, network, broadcast and usable addresses. Open tool

Three glowing JWT token segments connected to a cryptographic signature shield

JWT ManipulatorInspect header, payload and signature of JWT tokens. Open tool

Five encrypted token segments entering a luminous security vault

JWE ManipulatorSplit header, encrypted key, IV, ciphertext and tag of JWE tokens. Open tool

Secret key and message entering a dual-layer hash authentication mechanism

HMAC GeneratorCompute HMAC with SHA-256, SHA-512 and other algorithms. Open tool

Digital X.509 certificate under a magnifying glass with trust-chain connections

X.509 Certificate ViewerRead information from X.509 digital certificates. Open tool

Cryptographic key forge creating a luminous X.509 certificate and RSA key pair

X.509 Key & Certificate GeneratorGenerate X.509 and ICP-Brasil e-CNPJ certificates with RSA keys. Open tool

Neon diagram of linked tables, keys and relationship lines

Database DesignerModel tables, keys, indexes and relationships, then export SQL for MySQL, PostgreSQL, SQLite, SQL Server, MariaDB and Oracle, plus DBML and Mermaid. Open tool

Certificate and private key aligned in a glowing cryptographic validation matrix

Certificate & Key ValidatorValidate certificate expiry and match certificates, public and private keys. Supports PEM, CRT, CER, DER, PFX and P12. Open tool

Illustration for Certificate Date Changer

Certificate Date ChangerChange the Not Before and Not After dates of a PEM, PFX or P12 certificate, keeping the same keys and data. Open tool

Neon Kanban board with organized task columns, progress indicators and completed cards

KanbanAppKanban board to organize tasks and projects. Visit site

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