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PureDevKit

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All developer tools

Search 114 utilities — filter by suite, or jump straight in with a query.

All tools

114 tools

JSON Formatter

Beautify, minify, sort, and validate JSON entirely in the browser.

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JSON → TS

Infer TypeScript interfaces, type aliases, or Zod schemas from sample JSON.

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JWT Debugger

Decode JWT header, payload, and signature in-browser with expiry countdown.

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cURL → Code

Paste a cURL command and get Go net/http, Python requests, fetch, and Axios.

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Regex Tester

Test JavaScript regular expressions with matches, groups, flags, and replace.

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UUID Generator

Bulk-generate UUID v4, UUID v7, NanoID, and high-entropy API keys locally.

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SQL Formatter

Pretty-print SQL for PostgreSQL, MySQL, SQLite, MariaDB, and T-SQL.

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Base64 Studio

Encode or decode Base64 online — text, images, PDFs, files — free, no upload.

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Hash Generator

SHA-1, SHA-256, SHA-384, SHA-512, MD5, and HMAC from text or files in-browser.

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Unix Timestamp

Convert epoch seconds and milliseconds to ISO time, local time, and time zones.

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YAML / TOML

Convert YAML, JSON, and TOML in the browser.

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XML ↔ JSON

Convert XML to JSON and run XPath locally.

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CSV ↔ JSON

Parse CSV to JSON objects and emit INSERT statements.

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JSON Flatten

Flatten nested JSON, rebuild it, and query with JSONPath.

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JSON Schema

Validate JSON against a schema and infer a draft from a sample.

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JSON Diff

Diff two JSON documents and deep-merge objects locally.

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JSONL

Split, join, and sample newline-delimited JSON.

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HTML ↔ MD

Convert Markdown to HTML and HTML back to Markdown locally.

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.env ↔ JSON

Turn dotenv files into JSON and back.

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Tables

Convert HTML tables, CSV, and Markdown tables locally.

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ULID / KSUID

Generate time-sortable IDs locally with Web Crypto.

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Base32 / 58 / 85

Encode and decode Base32, Base58, and Ascii85 in the browser.

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AES-GCM

Encrypt and decrypt with AES-GCM and PBKDF2 in Web Crypto.

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TOTP / HOTP

Generate TOTP codes and otpauth URIs locally.

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JWT Generator

Sign HS256 tokens locally from a JSON payload.

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Passphrase

Generate high-entropy word phrases with Web Crypto.

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Check digits

Luhn, Verhoeff, ISBN, and GSTIN format checks.

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Redactor

Mask JWTs, PEMs, AWS keys, and password assignments.

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PKCE / OAuth

Build S256 PKCE and an authorize URL. No token endpoint is called.

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CRC32

CRC-32 of text or file bytes in the browser.

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URL tools

Parse URLs, edit UTM params, and slugify paths.

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HTTP status

Look up status codes and common headers without leaving the tab.

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CORS

See if a browser would allow a cross-origin request.

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Cookie builder

Compose Set-Cookie and Cache-Control directives.

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Webhook HMAC

Sign and verify Stripe, GitHub, Slack, and Razorpay webhooks locally.

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MIME detect

Guess MIME type from magic bytes in the browser.

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robots.txt

Generate robots.txt, sitemap.xml, and security.txt stubs.

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User-Agent

Parse browser, OS, and device from a User-Agent string.

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Case converter

camelCase, snake_case, kebab-case, slugs, and accent folding.

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Text diff

Unified diffs and apply patch in the browser.

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Line toolkit

Sort, unique, shuffle, reverse, trim, and grep lines locally.

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Word counter

Count words, characters, lines, and estimate reading time.

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Semver

Parse, bump, compare, and test caret ranges.

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gitignore

Combine Node, Python, Go, Rust, Next, and Android ignore templates.

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Unicode

Code points, UTF-8 bytes, NFC/NFD, and a punycode hostname peek.

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Email syntax

Check email syntax. No SMTP, no mailbox probe.

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JSON → INSERT

Turn JSON arrays or CSV into INSERT or PostgreSQL COPY.

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Connection string

Parse Postgres, MySQL, Mongo, Redis, and AMQP URLs. Never connects.

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Cron

Build and decode cron in plain English — with next runs and a month preview.

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Time zones

Live times across common IANA zones.

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Fake data

Generate fictional people for fixtures. Obviously fake emails.

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Lorem

Placeholder paragraphs as text, Markdown, or HTML.

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Dummy REST

Users, products, orders, and posts as JSON fixtures.

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Dummy webhooks

Sample GitHub, Stripe, Slack, Razorpay, Shopify, and Twilio payloads.

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Test cards

Stripe, Razorpay, Cashfree, PayU, Braintree, Adyen, and more — sandbox test cards, UPI IDs, OTP rules, and Luhn tools.

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Dummy files

Build a file of N bytes in memory and download it.

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Placeholder

PNG/JPEG/WebP placeholders at any size, in-browser.

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QR Code Generator

Free online QR code generator with logo, colors, and shapes. Make a QR code for a URL, Wi-Fi, vCard, UPI, location, PDF, or text — download as PNG, SVG, or PDF. No sign up, no watermark, never expires.

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Color / contrast

HEX, RGB, HSL, and WCAG contrast ratios in the browser.

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ZIP

Build a zip or list files inside one. All in memory.

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INI / JSON5

Convert INI, .properties, JSON5, and JSONC in the browser.

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GraphQL

Pretty-print GraphQL and emit a fetch snippet.

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DynamoDB JSON

Convert AttributeValue maps to plain JSON and back.

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OpenAPI

Parse OpenAPI JSON or YAML and emit cURL / fetch for the first path.

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Hex dump

Dump text or a local file as hex, and decode hex to UTF-8.

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RSA / ECDSA

Generate RSA-PSS 2048 or ECDSA P-256 keys and sign locally.

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PEM / JWK

Convert PEM and JWK, and emit ssh-rsa from an RSA JWK.

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Password KDF

PBKDF2-SHA256, htpasswd {SHA}, and bcrypt in the browser.

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Code → cURL

Turn a fetch, Axios, or requests snippet into cURL.

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Raw HTTP

Parse a raw request or response and emit fetch.

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CSP

Build Content-Security-Policy and related isolation headers.

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HTTP composer

Build a raw HTTP request and fetch snippet. Nothing is sent.

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Auth headers

Build Authorization: Basic, Bearer, and a Digest example.

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Rate limit

Parse Retry-After and X-RateLimit-* headers.

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DNS builder

Build A, AAAA, CNAME, MX, TXT, SRV, and CAA records. No live lookup.

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SPF / DMARC

Build SPF and DMARC TXT records and a DKIM placeholder. No DNS query.

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App links

Build iOS AASA and Android Digital Asset Links files.

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CF _headers

Build Cloudflare Pages _headers and _redirects stubs.

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AWS SigV4

Build a SigV4 canonical request and optional HMAC signature. No AWS call.

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Similarity

Levenshtein, Jaro, and Dice coefficients in the browser.

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Phone

Parse and format numbers with libphonenumber-js. No carrier lookup.

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Intl

Number, date, relative, list, and plural formatting via Intl.

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Line endings

Detect LF, CRLF, CR, convert them, and strip or add a UTF-8 BOM.

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ANSI HTML

Turn ANSI color codes into HTML you can preview.

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SPDX

Browse common SPDX license identifiers and generate a LICENSE file stub.

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Commits

Build a Conventional Commits message with type, scope, and breaking.

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i18n strings

Convert Android, iOS, gettext, ARB, and JSON string maps.

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Excel date

Convert Excel serial numbers to ISO-8601 and back.

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ISO duration

Parse P1DT2H-style durations and test interval overlap.

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Business days

Add weekdays, count them, and compute an SLO error budget.

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OnCalendar

Translate a 5-field cron into a systemd OnCalendar= line.

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Dummy logs

Generate JSON, logfmt, Apache, Nginx, or syslog lines.

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Dummy CSV

Generate a CSV of fake people for importer tests.

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ICS / vCard

Generate a one-event .ics and a simple vCard.

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Dummy .env

Node, Next.js, and Docker Compose .env stubs.

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India fixtures

Format-check PAN, GSTIN, IFSC, and UPI. Sample values included.

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Unicode torture

Zalgo, RTL, ZWJ emoji, homoglyphs, BOM, and long lines for input tests.

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problem+json

Build an application/problem+json document.

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Identicon

SHA-256 identicon PNG from a seed, drawn on canvas.

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Resize

Resize a local image with canvas. PNG, JPEG, or WebP out.

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Image convert

Convert a local image between PNG, JPEG, and WebP on canvas.

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Markdown preview

Preview Markdown as HTML and extract a table of contents.

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Meta tags

Generate title, Open Graph, Twitter card, and WebSite JSON-LD.

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CSS units

Convert px and rem, build clamp(), and a modular type scale.

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Web manifest

Build a web app manifest.json with icons placeholders.

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CIDR

Network, mask, range, host count, and containment for IPv4 CIDR.

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gzip

Compress and decompress gzip or deflate with CompressionStream.

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Deep links

Android intent URLs, iOS associated-domains stub, and custom schemes.

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Money

Format amounts with Intl and a small ISO 4217 catalog.

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Log pretty

Pretty-print JSON lines and logfmt into JSON objects.

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App icons

Design and export iOS, Android adaptive, and PWA icon packs in your browser.

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Image compressor

Free online image compressor that compresses a photo to an exact size in KB or MB — 20 KB, 50 KB, 100 KB, 200 KB, 500 KB, 1 MB — without losing quality. JPG, JPEG, PNG, and WebP. No upload, no sign up, no watermark.

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Screenshot Studio

Design store screenshots with device frames, templates, and text — all in your browser.

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P2P file transfer

Free P2P file sharing online with a 6-digit code or QR. WebRTC sends files straight phone ↔ laptop — nothing uploaded to a server, no size limit from us, bi-directional while you stay connected.

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