15 fast, private, browser-based utilities. No signup. No upload. No tracking.
Copy-paste, hand-tested prompts for writing, coding, marketing, productivity & learning. One-click copy, works with ChatGPT, Claude & Gemini. No signup.
14 copy-paste prompts for resumes, cover letters, LinkedIn, interviews & salary negotiation. One-click copy, no signup.
Convert JSON arrays to CSV format. Handles nested objects, custom delimiters, copy & download.
Generate UUID v4, UUID v7, and ULID identifiers. Bulk generate, copy, download.
Beautify, minify and validate JSON instantly in your browser.
Encode text to Base64 or decode Base64 to text, instantly.
Percent-encode URLs or decode encoded URL strings.
Count words, characters, sentences and reading time live.
Generate secure random passwords with custom rules.
Convert colors between HEX, RGB and HSL formats.
Convert text to UPPER, lower, Title, Sentence, camelCase.
Generate placeholder Lorem Ipsum paragraphs and words.
Generate MD5, SHA-1, SHA-256 hashes in your browser.
Compare two texts and highlight the differences.
Generate QR codes from any text or URL, free.
Convert length, weight, temperature and more.
Create linear, radial and conic gradients with live preview.
ToolNest brings together the most-used developer and productivity utilities in one fast, ad-supported site. Every tool here runs entirely client-side: that means your text, passwords and data never leave your browser. There is no server processing, no account required, and nothing stored. This makes our tools ideal for working with sensitive information like JSON config files, credentials or personal notes.
Our JSON Formatter is the fastest way to validate and pretty-print API responses. The Base64 encoder and URL encoder are everyday essentials for developers. Writers love the word counter for essays and tweets, while the password generator creates strong random passwords you can trust.
Speed: tools load instantly and run on your device. Privacy: nothing is sent anywhere. Cost: every tool is free. Bookmark this page — new tools are added regularly.
Battle-tested cheat sheets covering REST conventions, GraphQL query patterns, auth flows (OAuth 2.0, JWT), pagination, rate limiting, error handling, and real-world integration examples for Stripe, Twilio, GitHub and more. Part of the Duc Store — 37 battle-tested products.
Free browser-native AI tools for code, images, speech, and more
Stop paying for subscriptions — use these free alternatives
Merge, split, compress, and convert PDFs for free