50+ Free Developer & AI Tools
AI-powered generators, code formatters, text utilities, and network tools — all free, no signup required. Build faster with the developer toolkit that does the heavy lifting.
AI-Powered ToolsNEW
Free AI tools — no signup, no limits. Powered by advanced language models.
AI Business Tools
2 toolsAI Cover Letter Generator
Generate professional, tailored cover letters with AI. Enter job details and get a polished letter in seconds — free, no signup.
AI Contract Generator
Generate NDAs, freelance agreements, service contracts, and consulting agreements with AI. Enter the parties, scope, and terms — get a clean, clause-numbered contract you can copy, download, or hand to your lawyer for review.
Developer & Utility Tools
50+ free tools — 100% client-side, no data sent to any server.
Text Tools
Free online text formatting and processing tools. (16 tools)
Word Counter
Count words, characters (with and without spaces), sentences, and paragraphs instantly. Shows reading time and works for essays, tweets, SEO meta tags, and LinkedIn posts.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, and programmer cases (camelCase, snake_case, kebab-case, PascalCase). Preserves punctuation and Unicode characters.
Text Repeater
Repeat any text or word multiple times with customizable separators — newline, comma, space, or custom. Useful for test data, stress-testing input fields, and bulk content.
Lorem Ipsum Generator
Generate realistic Lorem Ipsum placeholder text by paragraph, sentence, or exact word count. Perfect for Figma mockups, wireframes, CMS previews, and typography testing.
Markdown Converter
Convert Markdown (CommonMark and GitHub-Flavored) to clean semantic HTML with live preview. Handles headings, tables, code blocks, images, and lists for READMEs and blog posts.
Text Diff / Compare
Compare two blocks of text side-by-side with color-coded additions, deletions, and modifications. Supports character-level and line-level diff for contracts, code, logs, and JSON.
Slug Generator
Convert any title into a clean, SEO-friendly URL slug. Handles accented characters, custom separators, lowercase toggling, and length limits for WordPress, Ghost, and static sites.
Text to HTML Converter
Convert plain text with paragraphs and line breaks into semantic HTML. Auto-wraps paragraphs in <p> tags, links URLs and emails, and escapes special characters for safe rendering.
Unicode Text Converter
Transform text into 14 fancy Unicode font styles — bold, italic, script, fraktur, outline, circled, small caps, and more. Copy-paste works on Instagram, LinkedIn, Twitter, and Discord.
Upside Down Text Generator
Flip your text upside down using Unicode characters. Copy and paste upside down text anywhere — social media, messages, usernames.
Cursed Text Generator
Generate cursed, glitchy, zalgo text using Unicode combining marks. Copy and paste creepy corrupted text for Discord, social media, and gaming.
Bold Text Generator
Generate bold, italic, and fancy Unicode text styles. Copy and paste bold text for Instagram, Facebook, LinkedIn, Discord, and more.
Strikethrough Text Generator
Generate strikethrough, crossed out, and line-through text using Unicode. Copy and paste strikethrough text for Discord, social media, and more.
Small Text Generator
Generate superscript, subscript, and small caps text using Unicode. Copy and paste tiny text for Instagram, Discord, gaming usernames, and more.
Italics Generator
Generate italic, bold italic, script, and fancy Unicode text styles. Copy and paste italic text for Instagram, Discord, Twitter/X, and more.
Backwards Text Generator
Reverse, mirror, and flip text instantly. Generate backwards text, reversed words, mirror text, and upside-down reversed text. Copy and paste for social media, pranks, and puzzles.
Developer Tools
Essential utilities for developers and programmers. (16 tools)
JSON Formatter
Format, beautify, and validate JSON with syntax highlighting, a collapsible tree view, auto-fix for trailing commas and single quotes, search, and JSON-to-XML/CSV/YAML conversion.
Base64 Encoder / Decoder
Encode text or binary data to Base64 or decode Base64 strings back to text. Handles UTF-8, emoji, Base64URL (JWT-style), and data URIs entirely in your browser.
URL Encoder / Decoder
Percent-encode URL components or decode encoded strings. Supports encodeURIComponent and encodeURI modes for query parameters, full URLs, and handles Unicode characters correctly.
UUID / GUID Generator
Generate cryptographically secure v4 UUIDs (GUIDs) in bulk using crypto.getRandomValues(). Perfect for database primary keys, API request IDs, and test fixtures — 122 bits of entropy.
HTML Minifier
Compress HTML by stripping comments, whitespace, and redundant attributes. Cuts typical file size by 25-40% to improve Core Web Vitals and speed up page loads without changing rendering.
JWT Decoder
Decode JSON Web Tokens to inspect the header, payload, and claims — all in-browser so tokens never leave your device. Flags expired tokens automatically and handles HS256 and RS256.
Mermaid Diagram Converter
Render Mermaid code for flowcharts, sequence diagrams, ER diagrams, class diagrams, Gantt charts, and pie charts into downloadable PNG (2× Retina) or SVG. Ideal for docs and READMEs.
Unit Converter
Convert between 80+ units across length, weight, temperature, digital data (MB/GB/TB), speed, time, volume, and area. Includes a tip calculator with bill splitting and percentage presets.
Color Code Converter
Convert colors between HEX, RGB, HSL, and CMYK with a visual picker and HSL sliders. Every format updates in real-time — ideal for design-to-dev handoffs, Tailwind themes, and print.
Regex Tester
Test and debug JavaScript regex patterns with real-time match highlighting, numbered capture groups, and flag toggles (g, i, m, s, u). Includes a cheat sheet and common-pattern presets.
Chmod Calculator
Visually calculate Linux file permissions — click read/write/execute for owner, group, and others to get octal (755), symbolic (rwxr-xr-x), and the full chmod command with recursive flag.
Markdown Table Generator
Build GitHub-Flavored Markdown tables visually with per-column alignment, CSV and TSV import, live preview, and one-click copy or .md download. Works on GitHub, GitLab, Notion, and Obsidian.
Random String Generator
Generate cryptographically secure random strings, passwords, API keys, and session tokens using crypto.getRandomValues(). Customize length, character sets, and exclude ambiguous characters.
Gitignore Generator
Build a comprehensive .gitignore by selecting languages (Node, Python, Go, Rust), frameworks (Next.js, Django, Rails), IDEs (VS Code, JetBrains), and OSes. Combines, deduplicates, and downloads instantly.
Code Share
Share code snippets instantly with syntax highlighting for 30+ languages, a short shareable URL, optional expiry, and one-click copy. Ideal for bug reports, interviews, and code reviews.
URL Shortener
Shorten long URLs into clean, shareable links with built-in QR codes and click analytics. Perfect for social media posts, email newsletters, print materials, and marketing campaigns.
Network Tools
Test your connection speed, check your IP address, and analyze network performance. (3 tools)
Internet Speed Test
Measure download speed, upload speed, and ping latency against a fast global network. Uses incompressible random data so QoS-aware middleboxes can't inflate the numbers — no ads, no signup.
IP Address Checker
Check your public IPv4 and IPv6 address with geolocation (country, city, timezone), ISP, ASN, and reverse DNS. Useful for verifying VPN termination and debugging connectivity.
DNS Lookup
Query live DNS records for any domain — A, AAAA, CNAME, MX, TXT, NS, SOA, CAA — with TTLs. Perfect for verifying deploys, SPF/DKIM/DMARC email records, and debugging propagation issues.
JSON Tools
Free online JSON formatting, escaping, and data transformation tools for developers. (10 tools)
JSON Escape
Escape quotes, backslashes, newlines, tabs, and Unicode control characters so raw text becomes a valid JSON string value — perfect for embedding SQL queries, HTML, or logs inside JSON payloads.
JSON Unescape
Unescape JSON-encoded strings back to readable text — turns \n into newlines, \" into quotes, and \uXXXX into Unicode characters. Perfect for decoding log payloads, API errors, and stack traces.
JSON Minifier
Minify and compress JSON by removing all whitespace, newlines, and indentation. Reduce JSON file size instantly with real-time compression stats.
JSON Compare
Compare two JSON objects side by side and find every difference. Visual tree diff and text diff views with additions, deletions, and modifications highlighted.
JSON to CSV Converter
Convert JSON arrays to CSV with nested-object flattening (dot-notation columns), configurable delimiters (comma, semicolon, tab, pipe), and one-click download — safe for Excel, Google Sheets, and bulk imports.
CSV to JSON Converter
Convert CSV or TSV data to structured JSON with automatic delimiter detection, type inference (numbers, booleans, null), RFC 4180 quoted-field handling, and file upload for large datasets.
JSON to YAML Converter
Bidirectional JSON ↔ YAML converter for Docker Compose, Kubernetes manifests, GitHub Actions, and CI configs. Customize indent, inline short arrays, and preserve types across conversions.
XML to JSON Converter
Bidirectional XML ↔ JSON converter with attribute prefixing (@ or _), auto-detection of repeated elements as arrays, CDATA handling, and customizable root element — great for SOAP and RSS.
JSON Schema Generator
Generate a JSON Schema from sample JSON data with auto-detection of types, format patterns (email, UUID, date, IPv4), required fields, and enum values. Supports Draft 2020-12 and Draft-07 plus validation mode.
YAML Formatter
Format, validate, and minify YAML with line-precise error reporting that catches indentation mistakes, stray tabs, and unquoted version strings. Customize indent size, sort keys, and toggle flow style.
CSS Tools
Free online CSS and design tools for developers and designers. Convert between px, rem, em, inches, and more — all running 100% in your browser. (2 tools)
Pixels to Inches Converter
Convert pixels to inches, centimeters, millimeters, and points at any DPI. Includes inches to pixels conversion and a precomputed reference table.
Px to Rem Converter
Convert between px, rem, and em CSS units with a configurable base font size. Includes a reference table for common conversions and one-click copy.
Math Tools
Free online math calculators and converters for business, science, and development. Calculate markup, convert scientific notation, and more — all running 100% in your browser. (2 tools)
Markup Calculator
Calculate markup percentage, profit margin, selling price, and profit — and convert between markup and margin instantly. Includes a reference table for common percentages and formulas explained.
Scientific Notation Converter
Convert numbers to and from scientific notation, E notation, and engineering notation. Includes a scientific notation calculator with step-by-step solutions.
Latest Developer Insights
Practical guides, tutorials, and deep dives into the tools and concepts developers use every day.
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Stanford AI Index 2026: The Report Every Developer Should Read
The 2026 Stanford AI Index reveals $242B+ in investment, models scoring 50% on Humanity's Last Exam, and 74% of AI value captured by just 20% of companies.
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The Ultimate Platform for Free Developer & AI Tools
DevPik is your one-stop destination for free online developer tools, AI-powered utilities, and practical tech insights. Whether you're a software developer, content creator, SEO professional, job seeker, or tech enthusiast, our platform provides everything you need to work smarter and more efficiently.
Our newest addition is a growing suite of free AI-powered tools — including an AI meta description generator for SEO professionals and an AI cover letter generator for job seekers. These tools use advanced language models to deliver professional-quality results in seconds, completely free and with no signup required.
Our collection of 50+ free online tools includes essential utilities for text processing — word counters, case converters, markdown converters, and Lorem Ipsum generators. For developers, we offer JSON formatters, regex testers, Base64 encoders, JWT decoders, UUID generators, HTML minifiers, and more. Every static tool runs 100% client-side with zero data sent to servers, ensuring maximum privacy and speed.
Join thousands of developers and creators who rely on DevPik as their daily toolkit. All our tools are free forever, require no signup, and prioritize your privacy. Start exploring today and discover why DevPik is the ultimate online toolkit for developers and creators.