Free Developer Tools — Format, Test, Convert, Generate

Nine coding utilities for everyday development work. JSON formatting, regex testing, diff checking, SQL beautifying, CSS gradient and box-shadow generators, color conversion, and more. All browser-based, all private, all free.

JSON Formatterfreejsonformatter.appFree JSON formatter in your browser. Base64 Encoder/Decoderfreebase64.appEncode and decode Base64 for text and files. Regex Testerfreeregextester.appTest regular expressions with live match highlighting, capture groups, and flags. Diff Checkerfreediffchecker.appCompare two texts side-by-side with added and removed lines highlighted. SQL Formatterfreesqlformatter.appFree SQL formatter and beautifier. Code Beautifierfreecodebeautify.appFormat HTML, CSS, JavaScript, TypeScript, JSON, XML with one click. CSS Gradient Generatorfreegradientgen.appVisual CSS gradient generator for linear, radial, and conic gradients. Box Shadow Generatorfreeboxshadow.appDesign CSS box-shadow visually with live preview. Color Converterfreecolorconvert.appConvert colors between HEX, RGB, HSL, HSV, and CMYK formats.

Why Freesuite for developer utilities?

Every tool on this page is a single-purpose web app. Open the URL, paste your data, get your result. There is no account creation, no cookie banner, no "sign in to save your work" popup. This is how developer tools used to work before everything required a SaaS account.

Every tool runs fully in your browser. Your JSON, regex patterns, production SQL queries, proprietary code snippets, and private API keys never leave your device. This matters for anyone working with production data, confidential business logic, or sensitive configuration.

The nine tools in detail

JSON Formatter — freejsonformatter.app

Paste JSON, get instant pretty-printed output with syntax highlighting. Invalid JSON shows the exact line and reason. Minify mode produces compact output for production use.

Regex Tester — freeregextester.app

Live match highlighting as you type. See every capture group, tweak flags (g, i, m, s, u), and get match count at a glance. Built for iterative regex development.

Diff Checker — freediffchecker.app

Side-by-side comparison of two texts with line-by-line additions/removals highlighted. Useful for comparing config file versions, legal doc revisions, or debug output.

SQL Formatter — freesqlformatter.app

Beautify minified SQL into readable indented queries. Dialect-aware (PostgreSQL, MySQL, T-SQL). Can also minify for embedding in code.

Code Beautifier — freecodebeautify.app

Format HTML, CSS, JavaScript, TypeScript, JSON, XML, and more. Detects language automatically or accepts an explicit choice.

Base64 Encoder/Decoder — freebase64.app

Encode text or files into Base64, decode Base64 back to text or binary. Useful for quick data URIs, decoding JWTs, and inspecting encoded payloads.

CSS Gradient Generator — freegradientgen.app

Visual gradient editor producing copy-paste CSS. Supports linear, radial, and conic gradients. Multiple color stops, angle control, and live preview.

Box Shadow Generator — freeboxshadow.app

Visual CSS box-shadow designer. Adjust x-offset, y-offset, blur, spread, color, inset. Stack multiple shadows. Get clean CSS ready to paste.

Color Converter — freecolorconvert.app

Convert between HEX, RGB, HSL, HSV, and CMYK. Pick colors visually, look up named CSS colors, and copy values in any format with one click.

Comparison to JSONLint, RegExr, DevDocs, and others

JSONLint.com is a classic formatter but has ads and no offline mode. RegExr.com is the gold standard for regex with excellent community patterns — Freesuite is simpler, faster to load, and ad-free. DevDocs is a reference tool, not a utility. Freesuite's tools are bundled on one brand so you don't hop between sites for everyday tasks.

Built for privacy

A surprising amount of developer data that gets pasted into "free" online tools ends up in server logs. Regex patterns, JSON payloads, and SQL queries can leak API structures, database schemas, and business logic. Freesuite's tools run in your browser with no upload, so nothing is exposed.

Frequently asked questions

Are Freesuite's developer tools really free?

Yes. All 9 developer tools are 100% free with no usage limits, no signups, no ads, and no API quotas. Everything runs in your browser.

Is my code or data sent to a server?

No. Every developer tool runs fully client-side. JSON, regex patterns, code snippets, SQL queries, and diff inputs stay in your browser. No cloud processing.

Can I use these tools for proprietary or confidential code?

Yes. Since nothing is uploaded, you can safely use them with proprietary code, production SQL queries, or confidential config files. There is no logging, no storage, no analytics on tool contents.

Do the tools work offline?

Yes. All developer tools are installable as Progressive Web Apps and work offline after the first load. Useful on flights or in air-gapped environments.

How does Freesuite compare to JSONLint, RegExr, or DevDocs?

JSONLint and RegExr are excellent focused tools. Freesuite's versions are comparable but ad-free, and bundled together so you can jump between JSON formatting, regex testing, and diff checking without switching sites. Freesuite tools are also PWA-installable and work offline.

What regex flavor does Freeregextester support?

JavaScript regex syntax (ECMAScript), which is the same as what the Freeregextester runs in your browser. For Python, Go, or PCRE-specific patterns, test in the language's native tooling.