Privacy-First Developer & PDF Tools

A highly optimized, server-free, client-side toolkit hosting essential daily utility tools for software engineers. All operations run strictly local inside your browser.

100% SECURE & OFFLINEAll tools process data locally in your browser. Zero server uploads.

Matching Utilities (62)Sorted Alphabetically
Cryptography

AES Encrypt/Decrypt

Encrypt and decrypt text messages securely using robust Advanced Encryption Standard (AES).

#aes#encrypt#decrypt
DateTime

Age Calculator

Calculate exact chronological age, zodiac signs, milestones, and birthday countdowns.

#age#calculator#chronological age
Encoding

Base64 Encoder / Decoder

Convert plain text strings into safe Base64 format and vice-versa.

#base64#encoder#decoder
PDF

Bates Numbering PDF Stamp

Stamp serial numbers and custom labels onto PDF margins for legal and financial archives.

#bates numbering#pdf bates stamp#legal indexing pdf
Generator

Bulk Image Compressor

Compress and resize WebP, JPEG, and PNG images locally in bulk.

#image compressor#bulk image compression#png compression
Encoding

Character Inspector

Inspect string code points, binary bytes, zero-width joiners, and copy HTML entities.

#character inspector#unicode inspector#ascii lookup
Network

CIDR Aggregator

Summarize subnets into minimal CIDR supernet blocks and eliminate route redundancies.

#cidr aggregator#supernetting calculator#ip summarization
DateTime

Countdown Timer

Precision countdown clock and sprint timers with browser chimes.

#countdown clock#timer#pomodoro
DateTime

Cron Expression Builder

Build, parse, test, and translate cron schedule strings into English.

#cron#crontab#cron builder
Generator

CSS Generator

Visually generate multi-layered box shadows and linear/radial CSS gradients.

#css generator#box shadow#gradient generator
JSON

CSV / JSON Converter

Convert CSV data to structured JSON packages and vice versa with custom formatting.

#csv to json#json to csv#excel to json
Encoding

cURL Builder

Visually construct, parse, test, and convert cURL commands into multi-language code snippets.

#curl builder#curl generator#curl parser
Generator

Diff Checker

Compare two text inputs side-by-side or inline to isolate line and character level differences.

#diff checker#text diff#compare text
Network

DNS Record Generator

Generate and validate BIND DNS zone files, SPF/DMARC policies, and provider templates.

#dns record generator#zone file builder#bind zone file
Generator

Fake Data Generator

Build high-fidelity mock datasets containing custom fields in JSON, CSV, and SQL insert scripts.

#fake data generator#mock data#json dataset builder
Generator

Favicon Generator

Create custom favicons from text/initials, emojis, or uploaded images.

#favicon generator#favicon compiler#ico generator
Generator

Flexbox & Grid Visualizer

Interactively test, inspect, design, and export CSS Flexbox and Grid layouts with Tailwind output.

#css flexbox visualizer#css grid visualizer#flexbox generator
Encoding

GraphQL Query Builder

Visually construct GraphQL queries, select nested fields, test live endpoints, and export Apollo or Fetch code.

#graphql query builder#graphql tester#graphql generator
Cryptography

Hash Generator

Compute secure cryptographic hashes of different algorithms for text strings and files.

#hash generator#cryptography#md5
Encoding

HTML Entity Tool

Encode or decode text to and from HTML entity representations.

#html entity#html encoder#html decoder
PDF

HTML to PDF

Convert plain HTML code, uploaded files, or raw web pages into clean digital PDF documents.

#html to pdf#convert page to pdf#webpage to pdf
PDF

Images to PDF

Convert PNG, JPG, WEBP, and SVG images to a single high-quality PDF.

#images to pdf#png to pdf#jpg to pdf
Encoding

JSON Diff Visualizer

Compare two JSON objects side-by-side, highlight additions, removals, and changes, and generate RFC 6902 JSON Patch.

#json diff visualizer#json diff#json compare
JSON

JSON Formatter

Pretty print, format, and sort keys of your JSON data.

#json#formatter#pretty print
JSON

JSON Minifier

Compress and strip unnecessary whitespaces from your JSON.

#json#minifier#compress
Encoding

JSON Path Explorer

Query, evaluate, filter, and extract nodes from JSON payloads with an interactive tree view.

#json path explorer#jsonpath evaluator#jsonpath tester
JSON

JSON to TS Interface

Transform raw JSON into strongly-typed TypeScript interfaces effortlessly.

#json to typescript#json to ts#typescript generator
JSON

JSON Validator

Validate JSON syntax and isolate error locations instantly.

#json#validator#lint
Encoding

JWT Debugger

Decode JSON Web Tokens, customize headers or payloads, and validate HMAC signatures locally.

#jwt debugger#decode jwt token#jsonwebtoken
PDF

Markdown ↔ PDF Exporter

Convert styled markdown documents into print-ready styled PDFs.

#markdown to pdf#markdown editor#md to pdf
Encoding

Mock API Generator

Build custom REST schemas, generate realistic mock JSON data, test simulated endpoints, and export MSW or Express code.

#mock api generator#fake api generator#mock data generator
Network

Network Latency Calculator

Calculate propagation, serialization, queuing, and processing delays with LaTeX equations.

#network latency calculator#propagation delay#serialization delay
Generator

OpenAPI to TypeScript

Convert OpenAPI & Swagger specifications (JSON/YAML) to TypeScript types, interfaces, Zod schemas, and Fetch/Axios clients.

#openapi to typescript#swagger to typescript#openapi to zod
Generator

Password Generator

Generate highly customized, cryptographically secure random passwords instantly.

#password generator#random password#credentials
PDF

Password Protect PDF

Encrypt and secure PDF files with passwords and custom user restrictions.

#password protect pdf#encrypt pdf#lock pdf
PDF

PDF Compressor

Reduce PDF file size locally in your browser sandbox securely. All files are processed locally in your browser.

#pdf compressor#compress pdf#reduce pdf size
PDF

PDF Merger

Combine multiple PDF files into a single document client-side. All files are processed locally in your browser.

#pdf merger#combine pdf#merge pdf
PDF

PDF Metadata & Redact

Inspect PDF metadata tags, scrub private information, and visual-censor content.

#pdf metadata viewer#strip pdf metadata#scrub pdf
PDF

PDF OCR & Text Extractor

Extract text from PDF pages or scanned image documents using browser-side extraction and local OCR.

#pdf ocr#extract text from pdf#pdf text extractor
PDF

PDF Organizer

Sort, add, rotate, and delete PDF pages visually with drag & drop. All files are processed locally in your browser.

#organize pdf#reorder pdf#sort pdf pages
PDF

PDF Splitter

Split a PDF into separate files, extract selected ranges, or download individual pages. All files are processed locally in your browser.

#pdf splitter#split pdf#extract pdf pages
PDF

PDF to Images

Convert PDF pages to JPG or PNG images and download them block-by-block.

#pdf to images#pdf to png#pdf to jpg
PDF

PDF to PDF/A

Convert PDF files to ISO archival compliant PDF/A format locally.

#pdf to pdfa#convert pdf/a#pdf/a converter
Generator

QR Code Gen/Reader

Generate customized QR codes and read/decode QR code images.

#qr code#qrcode#generator
Generator

Regex Tester

Build, test, and analyze regular expressions with live match highlighting and plain-English explanations.

#regex tester#regular expression#regex matcher
Cryptography

RSA Key Generator

Generate secure public and private RSA key pairs with custom bit lengths.

#rsa generator#rsa keys#public key
Network

Security Headers Inspector

Inspect, score, and configure HTTP security headers (CSP, HSTS, XFO) and CORS rules.

#security headers#cors inspector#content security policy
SEO

SEO Page Analyzer

Analyze HTML webpage code for critical SEO on-page ranking signals.

#seo#seo audit#seo analyzer
SQL

SQL Formatter

Beautify, clean, and format database SQL scripts instantly.

#sql formatter#sql beautifier#format sql
Generator

SQL to TypeScript & ORM

Convert CREATE TABLE SQL DDL statements to TypeScript interfaces, Prisma models, Drizzle, Kysely, TypeORM, and Zod.

#sql to typescript#sql to prisma#sql to drizzle
Network

Subnet / CIDR Calculator

Calculate IPv4 and IPv6 subnet masks, CIDR network ranges, usable hosts, VLSM splitting, and supernet summarization.

#subnet calculator#cidr calculator#ip subnet calculator
Generator

SVG Optimizer

Clean, minify, and optimize SVG vector graphics client-side.

#svg optimizer#svg compressor#minify svg
Generator

SVG Path Editor

Edit coordinates visually, draw vector shapes on a scale grid, and compress SVG path outlines.

#svg path editor#svg optimizer#vector path editor
Generator

Tailwind Config Builder

Visually configure colors, typography, shadows, and download your tailwind.config.js layout.

#tailwind config builder#tailwind custom colors#tailwind.config.js generator
DateTime

Unix Time Converter

Convert epoch Unix timestamps to human readable dates and vice-versa.

#unix time#epoch#timestamp converter
PDF

Unlock PDF

Remove user password protection and accessibility limits from secured PDFs.

#unlock pdf#remove password from pdf#pdf decryptor
Encoding

URL Encoder / Decoder

Encode or decode text to and from percent-encoded format for safe web transport.

#url encoder#url decoder#percent-encoding
Generator

UUID Generator

Generate RFC 4122 compliant version 4 UUIDs instantly in bulk.

#uuid#guid#generator
PDF

Watermark PDF

Apply text overlays or copyright stamps to PDF pages in your browser.

#watermark pdf#add watermark to pdf#stamp pdf
DateTime

World Clock

Compare times across multiple global cities simultaneously.

#world clock#time zones#timezone converter
JSON

XML / JSON Converter

Convert hierarchical xml data schemas to JSON structures and vice versa.

#xml to json#json to xml#xml browser parser
JSON

YAML ↔ JSON

Convert between JSON and YAML datasets securely, offline.

#json to yaml#yaml to json#converter

About DevToolkit

DevToolkit.xyz is a comprehensive suite of highly optimized, 100% privacy-first client-side web utilities designed to empower developers, system administrators, and digital professionals. All DevToolkit calculations, formatting actions, and parsing routines execute strictly within your local browser's memory segment (RAM).