Sixteen free developer tools that run entirely in your browser. Format JSON, generate meta tags, build CSS gradients, decode JWTs, create UUIDs and more. No sign-up, no upload, nothing sent to our servers. Built and maintained by the Pinkontin engineering team.
Free online JSON formatter and validator. Format, minify and validate JSON with syntax highlighting and instant error detection.
Open ToolOnline SEO meta tag generator with live Google SERP and social media card previews. Outputs ready-to-paste HTML and Open Graph tags.
Open ToolCSS gradient generator with Tailwind output. Design linear and radial gradients visually, then copy production-ready CSS or Tailwind classes.
Open ToolFree online Base64 encoder and decoder. Convert text and data with URL-safe mode and full Unicode support, all in your browser.
Open ToolFree regex tester with live highlighting. Test regular expressions against your text in real time, with a library of common patterns and a replace mode.
Open ToolLorem ipsum generator with HTML output. Create placeholder text by paragraphs, sentences or words, with optional wrapped HTML markup.
Open ToolConvert colors between HEX, RGB, and HSL formats with live preview and CSS output.
Open ToolOnline password generator, no sign-up. Create strong, random passwords with customizable length and character sets. Generated locally and never stored.
Open ToolWrite markdown and see live preview with HTML export. Split-pane editor with instant rendering.
Open ToolFree QR code generator with custom colors. Create QR codes for URLs, text or any data, adjust size and color, and download as PNG.
Open ToolCount words, characters, sentences, and paragraphs with reading time estimation.
Open ToolOnline JWT decoder, no login required. Paste a JSON Web Token to inspect its header, payload and expiration. Decoding happens entirely in your browser.
Open ToolConvert text between uppercase, lowercase, title case, camelCase, snake_case, kebab-case, and more.
Open ToolFree online image compressor with no upload limit. Reduce file size with adjustable quality, resize and format conversion. Images never leave your device.
Open ToolOnline UUID v4 and v7 generator, free. Bulk generation with uppercase and no-dash formatting. Cryptographically secure and generated in your browser.
Open ToolFree website SEO analyzer. Audit any site for SEO, security, performance, accessibility and mobile-friendliness, with actionable fixes.
Open ToolFree slowed and reverb maker. Change speed, pitch, bass and reverb on any song and download the result. Runs in your browser, nothing is uploaded.
Open ToolGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text. All four update as you type, and nothing leaves your browser.
Open ToolCompare two texts or code snippets line by line and see exactly what was added, removed and left alone.
Open ToolPercent encode and decode URLs and query strings, with a breakdown of every part of the address.
Open ToolConvert Unix timestamps to readable dates and back, in seconds or milliseconds, with ISO, UTC and local output.
Open ToolFormat messy SQL into readable queries with proper clause breaks and keyword casing, without touching string literals.
Open ToolIndent, validate and minify XML. Catches parse errors before you paste a broken feed or sitemap into production.
Open ToolBuild layered CSS box shadows with a live preview, then copy them as plain CSS or a Tailwind arbitrary value.
Open ToolEvery HTTP status code with what it means and when to send it, searchable by number, phrase or description.
Open ToolTurn titles into clean URL slugs, with proper transliteration for Turkish and accented characters, one per line.
Open ToolConvert between binary, octal, decimal, hexadecimal and any base up to 36, including very large integers.
Open ToolTurn a spreadsheet export into JSON, with quoted fields, custom delimiters and automatic type detection.
Open ToolFlatten JSON into spreadsheet columns using dot paths, then copy it or download the file.
Open ToolConvert config files in both directions, covering nested maps, lists, comments and block scalars.
Open ToolGenerate TypeScript interfaces from a JSON payload, with named interfaces for nested objects.
Open ToolEscape HTML special characters or convert named and numeric entities back into readable text.
Open ToolTurn an image into a data URI you can inline in CSS, HTML or Markdown, without uploading the file.
Open ToolMinify or beautify CSS with strings and data URIs left intact, and see how much smaller it got.
Open ToolIndent messy markup or minify it, with void elements and pre blocks handled correctly.
Open ToolRead any cron expression in plain language and see exactly when it will next run.
Open ToolBuild realistic fake test data from the fields you choose, as JSON, CSV or SQL inserts.
Open ToolRound corners visually, including the slash syntax that produces organic blob shapes.
Open ToolEvery flexbox property with a live preview, plus CSS and Tailwind output.
Open ToolBuild grid layouts visually, including responsive auto-fit columns.
Open ToolDrag the handles to shape a CSS easing curve and watch it animate.
Open ToolDraw clip-path shapes by dragging points, or use circle, ellipse and inset.
Open ToolBuild frosted glass panels with backdrop-filter, previewed on real backdrops.
Open ToolCheck any colour pair against WCAG AA and AAA, and get a suggested fix when it fails.
Open ToolTurn one hex value into a full 50 to 950 scale for Tailwind v4, v3 or CSS variables.
Open ToolURL-encode an SVG into a data URI for CSS backgrounds and masks, smaller than Base64.
Open ToolPull the dominant colours out of an image with hex, HSL and the share of each.
Open ToolBuild valid JSON-LD for Organization, LocalBusiness, FAQ, Article and Product without writing it by hand.
Open ToolWrite crawler rules with presets, including one that blocks AI training crawlers.
Open ToolTurn a list of URLs into a valid XML sitemap you can copy or download.
Open ToolBuild campaign URLs with consistent parameters, so analytics does not split one campaign in two.
Open ToolSee how a title and description will be cut off in Google, measured in pixels rather than characters.
Open ToolCount the phrases your content actually repeats, with stopwords filtered and Turkish supported.
Open ToolBuild hreflang tags or sitemap alternates, with a check for the mistakes that silently break them.
Open ToolFlesch for English and the Ateşman formula for Turkish, with the numbers behind the score.
Open ToolCombine stack, tool and OS templates into one file with no duplicated lines.
Open ToolIndent queries, mutations and SDL, keeping arguments, strings and comments intact.
Open ToolSign a message with a secret key using SHA-1, SHA-256, SHA-384 or SHA-512. Hex and Base64 output.
Open ToolBuild and sign a JSON Web Token with HS256, HS384 or HS512, with one click iat, exp and nbf claims.
Open ToolCreate a two factor secret, see the live 6 or 8 digit code and copy the otpauth URI for any authenticator app.
Open ToolGenerate an Apache or Nginx basic auth line with APR1 MD5 or SHA-1, ready to paste into your .htpasswd file.
Open ToolMeasure entropy in bits, estimate crack time and see exactly which weaknesses a password has.
Open ToolGenerate cryptographically random API keys and tokens in hex, Base64URL, Base62 or UUID v4, with an optional prefix.
Open ToolRemove repeated lines from a list, or keep only the unique ones, only the duplicates, the first or the last.
Open ToolSort lines alphabetically, by length, by number, in reverse or at random, with proper Turkish letter order.
Open ToolJoin broken lines back into flowing text, keep paragraphs, or clean up the extra blank lines a paste left behind.
Open ToolReplace text across a whole document at once, with whole word, case sensitive and regular expression options.
Open ToolResize a photo to exact pixels or a preset width, with the aspect ratio locked, and save as JPEG, PNG or WebP.
Open ToolConvert between JPEG, PNG and WebP in your browser, with quality control and a live size comparison. AVIF where the browser supports it.
Open ToolCrop an image by dragging, or type exact coordinates, with 1:1, 4:3, 16:9 and other fixed ratios.
Open ToolRead the camera, date and GPS data hidden in a JPEG, then strip it out without touching the picture.
Open ToolCut a section out of an MP3 or any audio file on a waveform, preview it, and download it as WAV.
Open ToolFind the right Content-Type for any file extension, and the extension for any MIME type.
Open ToolBreak a user agent string into browser, engine, operating system and device, including bots.
Open ToolWork out network, broadcast, host range and mask from any CIDR block, and split it into smaller subnets.
Open ToolStrip comments and whitespace from JavaScript safely. Nothing is renamed and broken output is never returned.
Open ToolEstimate a project in person days from its type, features and platforms, then apply your own day rate.
Open ToolEvery tool runs client-side, loads fast, and asks for nothing. No account, no upload, no tracking.
All processing happens in your browser; these are genuinely client-side developer tools. Your code, tokens and images are never uploaded or sent to our servers.
Free dev tools with no sign-up required. No accounts, no email gate, no paywall, no trial. Just open the tool and use it.
Built with modern web standards. Works on any device, any browser, any operating system.
Yes, all 16 tools are completely free with no sign-up. There is no account, no email gate, no paywall, and no trial. You open any tool and start using it right away.
No. For the tools that transform text, code, or images, such as the JSON formatter, JWT decoder, password generator, and image compressor, everything is processed inside your browser. Nothing you paste or upload is sent to Pinkontin's servers, and there is no tracking.
Pinkontin offers 16 tools grouped into four categories. Formatters: JSON formatter and validator, Base64 encoder and decoder, regex tester, markdown preview, JWT decoder, and text case converter. SEO tools: meta tag generator, word counter, and website analyzer. CSS tools: CSS gradient generator and color converter. Generators: lorem ipsum generator, password generator, QR code generator, image compressor, and UUID generator.
Yes. The tools are built with modern web standards and work on any device, any browser, and any operating system. There is nothing to install and no extension to add.
Yes. The JWT decoder and password generator run entirely in your browser. Tokens you paste and passwords you generate stay on your device, are not sent to any server, and are not stored.
Yes. Pinkontin provides an embed option so you can place the tools on your own site. If you need a custom tool or application instead, the team also builds web applications, SaaS platforms, and developer tools.
Pinkontin offers 16 free online developer tools that run in your browser with no sign-up and no account. They include a JSON formatter and validator, meta tag generator, CSS gradient generator, Base64 encoder and decoder, regex tester, lorem ipsum generator, color converter, password generator, markdown preview, QR code generator, word counter, JWT decoder, text case converter, image compressor, UUID generator, and a website SEO analyzer. The tools are grouped into four categories (formatters, SEO tools, CSS tools, and generators) and are built and maintained by the Pinkontin engineering team. For the tools that transform text, code, or images, everything runs locally in your browser, so nothing you paste or upload is sent to a server or stored.