The Big LearnThe Big Learn
The Big Learn
Tools
Free · in-browser · no sign-up

Free Online Developer Tools

The Big Learn brings together the utilities developers reach for every day — Base64 and URL encoding, JSON and YAML formatting, JWT and certificate inspection, hash, UUID and password generation, QR codes, OCR and PDF editing. Everything runs in your browser, with no sign-up and no cost.

35 tools 5 categories 44 articles 565 Learn chapters 0 sign-ups required
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Text Tools

Neon text editing workspace with structured lines and transformation controlsText EditorClean, split, replace and transform text. Open tool Neon document template with connected variable placeholders and generated text blocksText TemplateFill in text using reusable variables. Open tool Elegant neon QR matrix with finder patterns, data modules and scanning beamsText to QR CodeGenerate QR codes from text and URLs. Open tool Multiple screens synchronizing glowing text through real-time network channelsText SharerShare temporary text between screens in real time. Open tool Luminous document image being scanned into precise editable text charactersOCR ConverterExtract text from images using OCR. Open tool Two glowing text documents connected by highlighted additions and removalsText DiffCompare two blocks of text and highlight the differences. Open tool

Developer Tools

Glowing binary data transforming into structured Base64 character blocksBase64 Text ConverterEncode and decode text in Base64. Open tool Neon web address branching into identifier, locator and name componentsURL CodecEncode and decode URLs quickly. Open tool Glowing JSON document with nested objects, arrays and formatting guidesJSON EditorFormat, minify and stringify JSON. Open tool Data blocks flowing through a cryptographic hash engine into fixed-length fingerprintsHash 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 badgesSwagger 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 fieldsJSON & 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 nodesUUID GeneratorGenerate v4, v7 and v1 UUIDs with formatting options. Open tool Digital clock and timeline flowing from the Unix epoch into modern systemsUnix TimestampConvert dates and times to Unix timestamps. Open tool Futuristic IPv4 address divided into four binary octets and branching into organized CIDR subnet rangesIPv4 CIDR CalculatorCalculate subnet ranges, masks, network, broadcast and usable addresses. Open tool Three glowing JWT token segments connected to a cryptographic signature shieldJWT ManipulatorInspect header, payload and signature of JWT tokens. Open tool Five encrypted token segments entering a luminous security vaultJWE ManipulatorSplit header, encrypted key, IV, ciphertext and tag of JWE tokens. Open tool Secret key and message entering a dual-layer hash authentication mechanismHMAC GeneratorCompute HMAC with SHA-256, SHA-512 and other algorithms. Open tool Digital X.509 certificate under a magnifying glass with trust-chain connectionsX.509 Certificate ViewerRead information from X.509 digital certificates. Open tool Cryptographic key forge creating a luminous X.509 certificate and RSA key pairX.509 Key & Certificate GeneratorGenerate X.509 and ICP-Brasil e-CNPJ certificates with RSA keys. Open tool Certificate and private key aligned in a glowing cryptographic validation matrixCertificate & Key ValidatorValidate certificate expiry and match certificates, public and private keys. Supports PEM, CRT, CER, DER, PFX and P12. Open tool Neon Kanban board with organized task columns, progress indicators and completed cardsKanbanAppKanban board to organize tasks and projects. Open external tool

Generators

Secure password characters emerging from a cryptographic random generator and lockPassword GeneratorGenerate secure passwords with length and character options. Open tool Abstract Brazilian test document numbers with verification digits and validation marksCPF & CNPJ GeneratorGenerate valid CPF and CNPJ numbers for software testing. Open tool

Audio & Video Tools

Illustration of a video editing workspace: a media library, a preview player with transport controls, a properties panel and a timeline of clips with a title and a music trackVideo EditorCut silence, zoom after long pauses, change the speed, replace or level the sound, add captions and text cards, and export as video or audio. Open tool Neon blue audio waveform on a dark stage, with hatched violet blocks marking the silent sections to be cut, an amber playhead and a timeline belowFree Silence CutterRemove silent sections from video and audio directly in your browser. Open tool Illustration of a video and an audio waveform flowing into an editor with a preview and a timeline, and out again as one finished videoVideo & Audio MergerJoin videos, audio and images into one file, in the order you choose, with fades, and download as video or audio. Open tool Illustration of text, pictures and an audio waveform flowing into an editor with a preview and separate text, picture and sound tracks, and out again as one finished videoText Video & Image MakerAnimate text over a photo or colour and export it as a video or a still image, with fades and background sound. Open tool

Image, Graphics & PDF Tools

Neon flowchart with connected process nodes, decisions and directional pathsFlowchart EditorDraw flowcharts with shapes, arrows and colors; import and export as Mermaid and XML. Open external tool Illustration of an image converter: files in PNG, JPG, WebP, GIF, TIFF, BMP, AVIF and SVG flowing into a panel that lists each one and offers a target format, and out again converted, with a ZIP of all of themImage ConverterConvert images between PNG, JPEG, GIF, WebP, AVIF, BMP, ICO and TIFF, keeping transparency and gradients. Open tool Multiple PDF pages and images converging into one polished digital documentPDF & Image MergerMerge multiple PDFs and images into a single PDF or image file, with reordering. Open tool One PDF document separating into clean individual pages and image previewsPDF SplitterSplit a PDF into individual pages, download as a ZIP of PDFs or JPGs. Open tool Ordered photographs transforming into a professionally bound digital PDF documentPDF CreatorArrange images and create a single PDF in your browser. Open tool Illustration for PDF to Image ConverterPDF to Image ConverterConvert every page of any number of PDFs to PNG or JPG and download them as a ZIP. Open tool Illustration of a book builder: a list of illustrated articles and their text, picture, quote, list and media elements flowing into a bound book on a lit podium, and out again as a PDF and an EPUB fileBook BuilderTurn any selection of Learn chapters and Articles into one Kindle EPUB or printable PDF. Open tool Luminous document image being scanned into precise editable text charactersOCR ConverterExtract text from images using local OCR with Tesseract.js. Open tool

Latest articles

44 guides explaining the standards and concepts behind each tool.

Capa editorial do Guia do Scrum com um ciclo iterativo em azul e roxoAgilidade e gestão de produtosO Guia do Scrum - edição completaTexto integral da tradução comunitária oficial do Guia do Scrum 2020 em português brasileiro, com atribuição, licença e fontes.35 min de leituraEditorial Scrum Guide cover with a blue and purple iterative cycleAgility and product managementThe Scrum Guide - Complete EditionThe complete text of the official 2020 Scrum Guide in English, including attribution, license details, and source references.30 min readPortada editorial de la Guía de Scrum con un ciclo iterativo azul y moradoAgilidad y gestión de productosLa Guía de Scrum - edición completaTexto íntegro de la traducción comunitaria oficial de la Guía de Scrum 2020 en español latinoamericano, con atribución, licencia y fuentes.35 min de lecturaDiagrama neon do Model Context Protocol conectando um modelo de IA a ferramentas, dados e serviçosIA e integraçãoModel Context Protocol (MCP): dos primeiros princípios à produçãoGuia integral de MCP 2026 com arquitetura, primitivas, transportes, servidor Python, clientes reais, OAuth, segurança, observabilidade e produção empresarial.85 min de leituraNeon Model Context Protocol diagram connecting an AI model to tools, data, and servicesAI and integrationModel Context Protocol (MCP): From First Principles to ProductionThe complete MCP 2026 guide to architecture, primitives, transports, a Python server, real clients, OAuth, security, observability, and enterprise production.85 min readDiagrama neón de Model Context Protocol que conecta un modelo de IA con herramientas, datos y serviciosIA e integraciónModel Context Protocol (MCP): de los primeros principios a la producciónGuía integral de MCP 2026 con arquitectura, primitivas, transportes, servidor Python, clientes reales, OAuth, seguridad, observabilidad y producción empresarial.85 min de lecturaNeon blue audio waveform on a dark stage, with hatched violet blocks marking the silent sections to be cut, an amber playhead and a timeline belowAudio and VideoSilence Detection: How Automatic Pause Removal WorksHow a silence cutter measures loudness in dBFS, decides which pauses are removable, and cuts video and audio in the browser without uploading anything.20 min readDocumento de código central conectado a estruturas de padrões de projeto GoF em estilo neonArquitetura de softwarePadrões de Projeto Gang of Four (GoF) em Java: guia completoOs 23 padrões da Gang of Four, exemplos em Java, relações com SOLID, comparações, refatoração de um checkout e quando não usar um padrão.60 min de leituraCentral code document connected to neon-style GoF design pattern structuresSoftware architectureGang of Four (GoF) Design Patterns in Java: Complete GuideAll 23 Gang of Four patterns, Java examples, SOLID relationships, comparisons, an e-commerce checkout refactoring and when not to use a pattern.60 min readDocumento de código central conectado a estructuras de patrones de diseño GoF en estilo neónArquitectura de softwarePatrones de Diseño Gang of Four (GoF) en Java: guía completaLos 23 patrones de la Gang of Four, ejemplos en Java, relaciones con SOLID, comparaciones, refactorización de un checkout y cuándo no usar un patrón.60 min de lecturaEcossistema de inteligência artificial generativa conectado a modelos, código, imagens, áudio e agentesInteligência artificialInteligência Artificial Generativa: guia completoFundamentos, arquiteturas, LLMs, RAG, IA multimodal, agentes, avaliação, segurança, governança, mercado e implementação empresarial.90 min de leituraGenerative artificial intelligence ecosystem connected to models, code, images, audio, and agentsArtificial intelligenceGenerative Artificial Intelligence: Comprehensive GuideFoundations, architectures, LLMs, RAG, multimodal AI, agents, evaluation, security, governance, market, and enterprise implementation.90 min read
See all 44 articles

Certification learning paths

10 study tracks and 565 chapters, with timed practice tests and an explained answer key.

SC-900 Security, Compliance, and Identity FundamentalsStudy path with eleven chapters on security, identity, Microsoft Security Copilot, Azure protection, Microsoft Defender, Microsoft Sentinel, trust, privacy, data security, compliance, retention, auditing, eDiscovery, and Microsoft Purview data governance and discovery, plus timed practice tests.6 practice tests360 questions AZ-900 Azure FundamentalsTimed practice tests on cloud concepts, Azure services, governance, cost management and SLAs.6 practice tests333 questions DP-900 Azure Data FundamentalsLocalized chapters and practice tests on data concepts, SQL, Azure Storage, Azure Cosmos DB, Microsoft Fabric, Azure Databricks, ingestion pipelines, warehouses, lakes, real-time streaming, Spark, Power BI modeling and visualization, governance, and AI.9 practice tests391 questions
See all 10 learning paths

Frequently asked questions

What utily.tools is, how it handles your data and what it costs.

What is utily.tools?

utily.tools is a free collection of online developer tools that run in your browser. It brings together text utilities, encoders and decoders, JSON and YAML tooling, certificate and token inspectors, hash and password generators, PDF utilities and QR code generation in a single place, so you do not need to install anything or jump between sites.

Are the tools really free to use?

Yes. Every tool on utily.tools is free, with no account, no sign-up and no usage limits. There is no paid tier and no trial period.

Do I need to create an account or install anything?

No. You open the tool you need and start using it immediately. utily.tools runs entirely in a modern web browser, on desktop or mobile, with no extension, download or registration required.

Is my data safe? Does anything get uploaded to a server?

The vast majority of the tools process your input locally in the browser, which means the text, files, certificates and tokens you paste never leave your device. The exceptions are the features that need a server by definition, such as the shared text tool that synchronises content between screens. Even so, avoid pasting production secrets or private keys into any online utility, here or elsewhere.

Which tools does utily.tools offer?

The catalogue is grouped into text tools, developer tools, generators and image, graphics and PDF tools. It includes a Base64 converter, URL encoder and decoder, JSON editor, JSON and YAML comparator, JWT and JWE inspectors, X.509 certificate viewer, generator and validator, hash and HMAC generators, UUID and password generators, Unix timestamp converter, IPv4 CIDR calculator, Swagger and OpenAPI editor, text diff, OCR converter, QR code generator and PDF merger, splitter and creator.

Can I use utily.tools offline?

Tools that run fully in the browser keep working while the page stays open, even if the connection drops. However, the site is not installable as an offline application, so the first load and any navigation to another tool require an internet connection.

What is the difference between the Tools and the Learn sections?

The tools solve an immediate task, such as decoding a token or calculating a subnet. The Learn section holds long-form study material on corporate API fundamentals and architecture, published in English, Portuguese and Spanish, while the Articles section explains the standards and concepts behind each individual tool.

Can I use utily.tools for commercial or professional work?

Yes. The tools are intended for everyday professional use by developers, QA engineers, security analysts and infrastructure teams. Bear in mind the usual precaution about sensitive material: use test data when you are inspecting formats and structures.

How can I report a bug or suggest a new tool?

The About page lists the contact details for feedback. Suggestions for new tools, bug reports and corrections to the articles are all welcome, and the catalogue grows regularly based on them.

Pick a tool and get to work

Every utility runs in your browser, ready to use. Prefer to build a deeper foundation first? The Learn section covers networking and API fundamentals step by step.

Explore the Learn section