Free Developer Tools tools

Format, validate, and clean up code and data structures directly in your browser.

What belongs in Developer Tools?

Developer tools should handle everyday formatting and validation tasks instantly, without an account and without sending code or data to a server.

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Typical reasons people use these tools

Validate an API response before debugging it
Pretty-print minified JSON for readability
Minify JSON before sending it in a request

Available Developer Tools tools

Open the exact converter, editor, or utility needed for the task. Every published page documents its workflow, privacy behavior, and known limits.

JSON FormatterFormat, validate, and minify JSON instantly in your browser. Base64 Encoder/DecoderEncode and decode Base64 instantly, with correct handling for accented characters and emoji. Password GeneratorGenerate strong, random passwords using your browser's cryptographically secure random number generator. UUID GeneratorGenerate random UUIDs (v4) instantly, one at a time or in bulk. Color Picker / ConverterPick a color and instantly get its HEX, RGB, and HSL values. Google Takeout AnalyzerDiagnose Google Takeout exports: match media with JSON sidecars, find missing dates and unmatched sidecars. Hash GeneratorGenerate SHA-1, SHA-256, SHA-384, and SHA-512 hashes of text or local files directly in your browser. Lorem Ipsum GeneratorGenerate Lorem Ipsum placeholder text by paragraphs, sentences, or words, directly in your browser. Regex TesterTest a JavaScript regular expression, inspect capture groups, and preview replacements directly in your browser. Password Strength CheckerCheck how strong a password is, with an estimated resistance to guessing and a clear checklist, directly in your browser. Slug GeneratorTurn any title or text into a clean, URL-friendly slug, instantly. URL Encoder / DecoderEncode or decode URLs and query parameters instantly, directly in your browser. JWT DecoderDecode a JSON Web Token's header and payload instantly, directly in your browser. Timestamp / Date ConverterConvert a Unix timestamp to a readable date, or a date to a Unix timestamp, instantly. Random Number GeneratorGenerate one or many random numbers within any range, with optional uniqueness and decimals. CSV to JSON ConverterConvert CSV data to formatted JSON, directly in your browser. JSON to CSV ConverterConvert a JSON array of objects to CSV, directly in your browser. Binary / Hex / Decimal ConverterConvert a number between binary, octal, decimal, and hexadecimal instantly, in either direction. Markdown to HTML ConverterConvert Markdown to HTML with a live preview, directly in your browser. HTML Entity Encoder / DecoderEncode text into HTML entities, or decode HTML entities back to plain text, instantly. Color Palette GeneratorGenerate a full color palette — shades, tints, and harmonies — from any base color. CSS Gradient & Box-Shadow GeneratorDesign CSS gradients and box shadows with a live preview and copy the generated CSS, directly in your browser. Meta Tag & Open Graph GeneratorGenerate title, meta description, and Open Graph / Twitter Card tags with a live social preview, directly in your browser. Favicon GeneratorGenerate a favicon.ico and a full favicon package from an image or text, directly in your browser. Code Minifier & BeautifierMinify or beautify CSS, HTML, and JavaScript code, directly in your browser. Robots.txt GeneratorGenerate a valid robots.txt file for your website, directly in your browser. Image to Base64 ConverterEncode an image to Base64 or decode a Base64 string back to an image, directly in your browser. CSS Cubic-Bezier / Easing Curve GeneratorVisually design a CSS cubic-bezier easing curve and preview the animation, directly in your browser. CSS Glassmorphism GeneratorDesign a frosted-glass CSS effect and copy the generated code, directly in your browser. CSS Clip-Path GeneratorPick a custom shape and get its ready-to-use CSS clip-path value, directly in your browser. Cron Expression Generator & ParserBuild a cron expression from a form, or paste one to get a plain-English explanation, directly in your browser. XML to JSON ConverterConvert between XML and JSON, directly in your browser. Color Contrast Checker (WCAG)Check whether a text and background color combination meets WCAG accessibility contrast requirements, directly in your browser. Google Fonts Pairing FinderBrowse curated heading and body font pairings from Google Fonts with a live preview, directly in your browser. SVG OptimizerReduce an SVG file's size by stripping comments, editor metadata, and excess numeric precision, directly in your browser. YAML to JSON ConverterConvert between YAML and JSON, directly in your browser. SQL Formatter / BeautifierFormat and beautify SQL queries for several database dialects, directly in your browser. Code to Image Snippet GeneratorTurn a code snippet into a shareable, styled image, directly in your browser. Mock Test Data GeneratorGenerate realistic-looking sample names, emails, addresses, and other test data as JSON, CSV, or SQL, directly in your browser.