Developer Tools

Free Online Developer Tools

Format JSON, compress CSS, generate placeholder text, hash strings, and convert timestamps. No signup, no install, no upload to a server.

29 tools available

.gitignore Generator

Pick your stack and get a clean, combined .gitignore to copy or download.

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Base64 Encode and Decode

Encode and decode Base64 text, with URL-safe output and file encoding.

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Box Shadow Generator

Create CSS box-shadows visually and copy the code.

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Calendar Link Generator Online Free

Generate add-to-calendar links for Google, Outlook, Yahoo, AOL, and an .ics file with reminders and repeat. Free.

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CSS Compressor Online Free

Live-compress CSS in your browser. Paste or upload, see savings as you type, copy or download the minified output. Nothing is uploaded.

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CSS Gradient Generator

Create CSS gradients visually and copy the ready code.

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CSS Grid Generator Online Free

Free CSS grid generator drag and drop tool. Build grid layouts visually and copy production-ready code.

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CSV to JSON Converter

Convert CSV to JSON with quoted-field support, delimiter choice, and type parsing.

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Diff Checker

Compare two texts and highlight the differences, side by side or inline.

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Flexbox Generator

Create CSS flexbox layouts visually and copy the code.

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Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text or files, with hex / Base64 output and built-in verify.

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HTML Formatter

Beautify or minify HTML with correct indentation, in your browser.

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JS Minifier

Minify JavaScript to cut file size. Paste or upload, copy or download.

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JSON Formatter, Validator, and Tree View

Format, minify, and validate JSON right in your browser. Tree view included. 100% private, no signup, no upload.

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JSON to CSV Converter

Convert JSON to CSV with nested flattening, delimiter choice, and live preview.

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JSON to TypeScript

Turn JSON into TypeScript interfaces or types, with nested shapes handled.

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JWT Decoder

Decode JWT header and payload, read claims, and verify HMAC signatures.

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Mailto Link Generator Online Free

Build properly encoded mailto URLs with To, Cc, Bcc, subject and body fields.

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Mock Data Generator

Generate fake test data as JSON, CSV, or SQL with custom fields.

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Number Base Converter

Convert numbers between binary, octal, decimal, hex, and any base 2 to 36.

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Regex Tester

Test regex with live match highlighting, capture groups, and replace.

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SharePad — Online Notepad with Shareable Link

Write rich text and share via short link without any account or signup.

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SQL Formatter

Beautify or minify SQL queries with keyword casing, in your browser.

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SQLite Viewer

Open a SQLite .db file, browse tables, run SQL queries, and export results.

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URL Encode and Decode

Encode and decode URLs and query strings, with component and full modes.

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UUID Generator

Generate v4, v7, v1, and nil UUIDs in bulk, formatted and ready to copy.

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What Is My Display Type

See your screen resolution, pixel ratio, color gamut and refresh rate, free.

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What Is My IP Address

Find your public IP address with country, city, ISP and ASN details.

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XML Formatter

Beautify or minify XML, check it is well formed, with highlighting.

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A focused set of utilities for the small jobs that come up while building and debugging. Format and validate JSON, convert between JSON, YAML, and CSV, generate a hash, encode or decode Base64 and URLs, build a cron expression, pick a color, test a regular expression, and more, all without leaving the browser. Everything runs locally on your machine, so code and data you paste never touch a server. There is nothing to install and no rate limit, which makes these quick to reach for in the middle of a task. Browse the developer tools below and open the one you need.

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