Free Online Tools for Developers, Designers & Everyday Use
Formatters, converters, generators, calculators, image utilities, and SEO tools — all running in your browser. No sign-ups. No data leaves your device.
What people use most
JSON Formatter Online
Free online JSON formatter — beautify, minify, and explore JSON in a live tree view. 100% browser-based, no upload, no signup, no data leaves your device.
JSON Validator Online
Free online JSON validator — instant pass/fail verdict with the exact line and column of any syntax error. Browser-based, no upload, no signup, no data sent.
Markdown to HTML Converter
Free online Markdown to HTML Converter with a live preview pane — paste GFM, copy sanitized HTML. 100% browser-based, no upload, no signup, no data sent.
HTML to Markdown Converter
Free online HTML to Markdown Converter — paste rich HTML, get clean GFM Markdown. 100% browser-based, no upload, no signup, no data leaves your device.
Base64 Encoder / Decoder
Encode or decode Base64 strings, with UTF-8 and URL-safe variant support.
Word Counter
Count characters, words, sentences, and paragraphs with live reading-time estimates.
Compress Image Online
Compress image online — shrink JPG, PNG, and WebP by up to 90% with a live quality slider. 100% browser-based, no upload, no signup, photos never leave you.
Hours & Minutes Calculator
Hours and minutes calculator — add and subtract time entries (HH:MM, one per line) for a total in HH:MM, decimal hours, and minutes. Free, no signup.
Browse by category
Tools grouped into 7 focused categories. Each landing page lists everything in that area with a short intro.
Developer Tools
Formatters, validators, encoders, hashes, and converters for everyday dev work.
Design Tools
Interactive CSS generators with live previews. Copy and paste into your project.
Text Tools
Word counters, case converters, diff checkers, and other text utilities.
Image Tools
Compress, convert, resize, and crop images — entirely in your browser.
Calculators & Converters
Unit, age, EMI, percentage, file size, time zone, and timestamp tools.
Utility Tools
Password generators, QR codes, barcodes, invoices, and PDF utilities.
SEO Tools
Build, inspect, and validate the SEO building blocks — meta tags, schema, sitemaps, robots, and OG previews.
Fresh out of the oven
Hours & Minutes Calculator
Hours and minutes calculator — add and subtract time entries (HH:MM, one per line) for a total in HH:MM, decimal hours, and minutes. Free, no signup.
Free Online Screen Recorder
Free online screen recorder that captures your screen, webcam, and microphone right in the browser. No download, no sign-up, no upload — chunks stream straight to disk so multi-hour recordings work without crashing the tab.
UUID Generator
Generate UUID v4, UUID v7 (time-ordered), and ULID identifiers in bulk with format controls.
Regex Tester
Test regular expressions live with match highlighting, capture groups, replace mode, and a cheatsheet.
YAML Formatter
Format and validate YAML, optionally convert to JSON. Line/column error pointing.
HEIC to JPG / PNG
Convert iPhone and Mac HEIC / HEIF photos to JPG or PNG in your browser. Batch ZIP download.
Quick answers
Are these tools really free?+
Yes. Every tool on Free Tools Grid is free to use without an account, without a watermark, and without any payment. We may show small unobtrusive ads to cover hosting, but the tools themselves are free.
Do you upload my files or data to a server?+
No. Almost every tool here runs entirely in your browser using JavaScript and the Web platform APIs. Your images, PDFs, and text never leave your device. We don't have a backend that processes your content.
Can I use these tools offline?+
After the first page load, most tools work offline because all processing happens locally. We're also planning to ship a fully offline-capable PWA build in a future release.
Do you track my activity?+
We use Google Analytics to understand which tools are popular so we can improve them. We never sell data, and we don't read the content you paste into the tools. You can disable analytics from the cookie banner.
Why isn't there a sign-up?+
We deliberately don't ask you to create an account. Most users just want to format some JSON or compress an image — making that gated behind a sign-up is friction with no benefit.
Can I suggest a new tool?+
Absolutely. Email us through the contact page or open an issue on our GitHub repo with what you'd like to see.