Dev Tools

A collection of handy utilities for developers, including JSON formatter, color converter, base64 & image file interconversion, regex tester, and many more local processing tools.

11 tools

Tools

JSON FormatterFormat / Minify / Validate JSON text
URL / HTML Encoder / DecoderEncode and decode URLs and HTML entities
Word CounterCount Chinese‑English words, characters, lines, paragraphs and high‑frequency words
Base64 Encoder / DecoderBase64 encode/decode text, and convert between images and Base64
Case & Sort & DedupeText case conversion, line sorting and deduplication
Timestamp ConverterConvert between Unix timestamps and dates
Base ConverterConvert between binary, octal, decimal, and hexadecimal
Regex TesterOnline regular expression matching tester
Color ConverterHEX / RGB / HSL conversion with color blindness simulation
Password & UUID GeneratorGenerate strong random passwords and UUIDs
MD5 / SHA HashCalculate MD5 / SHA-1 / SHA-256 locally for text or files

Articles

MD5/SHA Hash: Keep a Fingerprint of E-Invoices to Prevent Tampering2026-09-20Password & UUID Generator: Set Strong Initial Passwords for Smart-Home Devices2026-09-20Regex Tester: Batch-Validate a List of URLs2026-09-20Color Converter: Harmonize a Palette for Home and Interior Styling2026-09-20Base Converter: Understand CRC and Checksums Without Guessing2026-09-20Timestamp Converter: Investigate Domain and Certificate Expiry2026-09-20Case & Sort & Dedupe: Organize Open-Ended Survey Answers2026-09-20Word Counter: Resumes and Personal Statements Have Limits — Count First2026-09-20URL/HTML Encoder: Encode Link Parameters Before Embedding in Iframes2026-09-20Base64 Encoder/Decoder: Decode a Base64 Response Body When Debugging APIs2026-09-20JSON Formatter: Validate Before Saving Game Saves and Config Files2026-09-20MD5/SHA Hash: Understand Blockchain Transaction Hashes by Computing One2026-09-19Password & UUID Generator: A Dedicated Password for Every Forum Account2026-09-19Regex Tester: Extract IPs and URLs From Logs for Analysis2026-09-19Color Converter: Build One Coherent Palette for Slides and Reports2026-09-19Base Converter: Convert on the Fly When Reading Binary in a Hex Editor2026-09-19Timestamp Converter: Read the Timestamps When Building a Timeline2026-09-19Case & Sort & Dedupe: Deduplicate the Email List Before a Campaign2026-09-19Word Counter: Keep Chinese and English Abstracts Within Limits2026-09-19URL/HTML Encoder: Decode Long Links in SMS and Emails2026-09-19Base64 Encoder/Decoder: Carry Binary Safely in Data Import/Export2026-09-19JSON Formatter: Read the Form Payload Structure Before Debugging2026-09-19MD5/SHA Hash: Find Truly Duplicate Photos in Your Album2026-09-18Password & UUID Generator: Guest Wi-Fi and One-Time Access Codes2026-09-18Regex Tester: Prove the Rule Before Batch Renaming or Replacing2026-09-18Color Converter: Reference Palettes for Illustration and Game Art2026-09-18Base Converter: Learn Bitwise Operations and Crypto Basics With Binary and Hex2026-09-18Timestamp Converter: Align Log Times Across Multiple Servers2026-09-18Case & Sort & Dedupe: Organize Site Keywords and Link Lists2026-09-18Word Counter: Check Bilingual Contract Lengths Match2026-09-18URL/HTML Encoder: Encode Link Parameters for WeChat Share Cards2026-09-18Base64 Encoder/Decoder: Embed Small Images in Email Signatures Reliably2026-09-18JSON Formatter: Read Local Storage Data When Debugging Mini-Programs2026-09-18MD5/SHA Hash: Understand Why Passwords Are Stored Hashed2026-09-17Password & UUID Generator: Create Random Secrets and Tokens for APIs2026-09-17Regex Tester: Validate ID and Bank Card Formats Before Deploying2026-09-17Color Converter: Sample Colors From Photos to Build a Coherent Palette2026-09-17Base Converter: Understand chmod Bits and Bitmasks Without Memorizing2026-09-17Timestamp Converter: Confirm Cache Expiry When Debugging Scheduled Jobs2026-09-17Case & Sort & Dedupe: Consolidate Duplicates Before Organizing User Feedback2026-09-17Word Counter: SMS, Titles, and Ad Copy Have Character Limits — Count First2026-09-17URL/HTML Encoder: Handle Form POST Encoded Data More Easily2026-09-17Base64 Encoder/Decoder: Inline Small Icons and Captchas in Mobile H52026-09-17JSON Formatter: Tidy Up Responses When Analysing Traffic2026-09-17MD5/SHA Hash: Keep a 'Fingerprint' of E-Contracts to Prevent Tampering2026-09-16Password & UUID Generator: Set a Strong Parental Password for Kids' Devices2026-09-16Regex Tester: Validate Replace Rules Before Batch-Cleaning Text2026-09-16Color Converter: Get the Palette Right for Data Visualization2026-09-16Base Converter: Put the Base Conversion In Front of the Class2026-09-16Timestamp Converter: Convert Exported Database Time Fields Before You Compare2026-09-16Case & Sort & Dedupe: Organize Contacts and Excel Name Lists2026-09-16Word Counter: Essays and Homework Have a Minimum — Reach It First2026-09-16URL/HTML Encoder: Decode Example Links in API Docs to Readable Parameters2026-09-16Base64 Encoder/Decoder: Carry Parameters Safely in QR Codes and Mini-Programs2026-09-16JSON Formatter: Expand the Structure When Learning JSON2026-09-16MD5/SHA Hash: Hash Before Upload to Avoid Sending the Same File Twice2026-09-15Password & UUID Generator: One-Time Passwords for Devices and Guest Accounts2026-09-15Regex Tester: Batch-Extract What You Need From a Pile of Text2026-09-15Color Converter: Reconcile Screen Colors With Print Colors2026-09-15Base Converter: Color Values and Unicode Codepoints in Hex, On the Fly2026-09-15Timestamp Converter: When Front-End Time Is Wrong, Check Zone and Timestamp2026-09-15Case & Sort & Dedupe: Tidy Dictionaries, Tags, and Keyword Libraries2026-09-15Word Counter: Nail Word Counts for Translation and Academic Writing2026-09-15URL/HTML Encoder: Normalize Parameters Before Scraping Links2026-09-15Base64 Encoder/Decoder: Read the Base64 Inside JWTs and API Payloads2026-09-15JSON Formatter: Config File Not Taking Effect? Validate It First2026-09-15MD5/SHA Hash: File 'Fingerprints' for Deduplication and Forensics2026-09-13Password & UUID Generator: Create Test Accounts Without Reusing One Password2026-09-13Regex Tester: Design Form Validation and Test the Pattern First2026-09-13Color Converter: Verify Brand Colors So One Red Doesn't Become Five2026-09-13Base Converter: Convert IPs, Masks, and Color Values on the Fly2026-09-13Timestamp Converter: Check When Tokens and Certificates Expire2026-09-13Case & Sort & Dedupe: Tidy SQL IN Lists and Code Constants2026-09-13Word Counter: Check Length and Keyword Density Before Publishing SEO Content2026-09-13URL/HTML Encoder: Encode Parameters Before Sharing Links and QR Codes2026-09-13Base64 Encoder/Decoder: Inline Small Icons Into CSS to Cut a Request2026-09-13JSON Formatter: Make the Structure Clear Before Migrating Data2026-09-13MD5/SHA Hash: Verify Supply-Chain Files — Source and Content Must Match2026-09-12Password & UUID Generator: Give Every Account Its Own Key2026-09-12Regex Tester: Verify Anonymization Patterns Before You Run Them on Logs2026-09-12Color Converter: Dark Mode Palettes With One-Click HEX/RGB/HSL2026-09-12Base Converter: Binary and Hex Arithmetic for CTF and Bitwise Work2026-09-12Timestamp Converter: Schedule Across Time Zones by Turning Numbers Into Readable Time2026-09-12Case & Sort & Dedupe: Deduplicate Marketing Lists and Stop Double-Touching2026-09-12Word Counter: How Long Is the Script? Count Words, Estimate Duration2026-09-12URL/HTML Encoder: Build UTM Campaign Links Without Breaking Parameters2026-09-12Base64 Encoder/Decoder: Inline data URIs So Emails Don't Depend on External Links2026-09-12JSON Formatter: Validate Structured Output From Large Language Models2026-09-12MD5/SHA Hash: Verify Downloads So Files Aren't Silently Altered2026-09-10Password & UUID Generator: Stop Using '123456'2026-09-10Regex Tester: Test It Before You Bake It Into a Script2026-09-10Color Converter: HEX/RGB/HSL Conversion With Color-Blindness Simulation2026-09-10Base Converter: Convert Between Binary, Octal, Decimal, and Hexadecimal2026-09-10Timestamp Converter: Turn 1710000000 Back Into Readable Time2026-09-10Case & Sort & Dedupe: Tidy Up a Messy List of Text Lines2026-09-10Word Counter: Know the Count, High-Frequency Words, and Paragraphs Before You Hit Publish2026-09-10URL/HTML Encoder: Stop Special Characters From Breaking Links2026-09-10Base64 Encoder/Decoder: Pack an Image Into a Line of Text2026-09-10JSON Formatter: Validate It Before You Debug the API2026-09-10MD5 / SHA Hash: Calculate MD5 / SHA-1 / SHA-256 locally for text or files2026-09-09Password & UUID Generator: Generate strong random passwords and UUIDs2026-09-09Regex Tester: Online regular expression matching tester2026-09-09Color Converter: HEX / RGB / HSL conversion with color blindness simulation2026-09-09Base Converter: Convert between binary, octal, decimal, and hexadecimal2026-09-09Timestamp Converter: Convert between Unix timestamps and dates2026-09-09Case & Sort & Dedupe: Text case conversion, line sorting and deduplication2026-09-09Word Counter: Count Chinese‑English words, characters, lines, paragraphs and high‑frequency words2026-09-09URL / HTML Encoder / Decoder: Encode and decode URLs and HTML entities2026-09-09Base64 Encoder / Decoder: Base64 encode/decode text, and convert between images and Base642026-09-09JSON Formatter: Format / Minify / Validate JSON text2026-09-09MD5 / SHA Hash: Calculate MD5 / SHA-1 / SHA-256 Locally for Text or Files2026-09-08Password & UUID Generator: Generate Strong Random Passwords and UUIDs2026-09-08Regex Tester: Online Regular Expression Matching Tester2026-09-08Color Converter: HEX / RGB / HSL Conversion with Color Blindness Simulation2026-09-08Base Converter: 2/8/10/16 Base Interchange2026-09-08Timestamp Converter: Unix Timestamp & Date Interchange2026-09-08Case & Sort Dedupe: Text Case Conversion, Line Sorting & Deduplication2026-09-08Word Counter: Chinese/English Word Count, Characters, Lines, Paragraphs & High-Frequency Words2026-09-08URL / HTML Encoder/Decoder: URL & HTML Entity Encoding/Decoding2026-09-08Base64 Encoder/Decoder: Encode/Decode Text & Convert Between Images and Base642026-09-08JSON Formatter: Format / Minify / Validate JSON Text2026-09-08

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