Finish JSON, regex, API, image, and file busywork in one browser workspace.
36TDevTools brings the high-frequency jobs developers repeat every day into one place with fast search, saved favorites, recent tools, local history, and export-ready outputs.
Tool library
92
Built around common developer and ops cleanup tasks.
Categories
14
Browse by workflow when you know the job, not the exact tool name.
Continuity
Local
Favorites, recent tools, and saved sessions stay in the browser.
Why this feels faster
Traffic drivers
High-intent tools that compound
JSON Formatter, JSON to Excel, API Tester, Regex Tester, and Image Compressor anchor repeat use and SEO because they solve jobs people actively search for.
Search tools
Search by format, workflow, or output.
Killer tools
Start with the highest-return utilities
JSON Formatter
Format, validate, and beautify your JSON data for clarity.
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JSON to Excel Converter
Convert JSON arrays into Excel or CSV with preview, smart fix, and spreadsheet export.
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API Tester
Send lightweight browser-based API requests, inspect responses, and export the result.
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Regex Tester
Test your regular expressions in real-time, explain the pattern, and export matches.
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Image Compressor
Compress images using quality and max-width settings with auto-run and export-ready output.
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JWT Debugger
Decode JWT header and payload locally to inspect claims, expiry, and issuer fields.
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Workspace memory
Local project workspace is active
Workspace #1b7822a3 is tracking 1 tool in this browser so you can continue across tools without logging in.
Favorites
Pinned for repeat work
Recent tools
Return to your last jobs
Category map
Browse by workflow instead of hunting through tabs
Monetization ready
Ads now, pro later
Sponsored slot
Reserved placement for ad inventory or affiliate offers without interrupting the core workflow.
Future pro plan
No ads, larger history, advanced exports, saved collections, and heavier AI assists.
Built-in sharing loop
Every tool card and tool page now exposes simple save/share actions so useful workflows can spread naturally.
Creator Tools
Script, format, and rehearse content for YouTube, Instagram, reels, and creator workflows.
Teleprompter Tool
Read scripts smoothly with auto-scroll, mirror mode, fullscreen, and speed controls.
Reel Script Tool
Turn rough reel ideas into a hook-body-CTA script with pacing guidance.
YouTube Script Formatter
Format rough video notes into a cleaner YouTube script with sections and chapters.
YouTube Chapter Timestamp Builder
Generate YouTube-ready chapter timestamps from a rough outline or section list.
Instagram Caption Formatter
Clean up Instagram captions with stronger hooks, spacing, CTA, and hashtag placement.
School & Education
Create printable student and classroom documents with browser-based editing and export.
Question Paper Formatter
Format raw text into a clean, print-ready school question paper with automatic numbering.
Activity Sheet Generator
Create print-ready fill-in-the-blanks, match-the-following, and math worksheets with instant preview and PDF export.
Seating Arrangement Generator
Generate classroom exam seating arrangements from a list of students.
Answer Sheet Checker
Fast input grid for teachers to calculate marks, with double-entry mismatch detection.
Fee Defaulter List Generator
Generate and sort fee defaulter lists from student CSV data.
Transport Route List Generator
Organize and print student transport route lists grouped by bus number.
Letter Writing Generator
Generate formatted school letters (leave, TC, complaint, etc.) by filling out simple fields.
Student Name Slip Generator
Create modern printable student name slips with photo, class details, and PDF export.
Certificate Generator
Generate modern school certificates for achievement, participation, merit, attendance, sports, and more.
Timetable Generator
Create printable class timetables with editable periods, days, teacher details, and PDF export.
Report Card Generator
Create printable school report cards with subject marks, grades, remarks, totals, and PDF export.
School Circular Generator
Create clean printable school circulars and notices with heading, audience, body, signatory, and PDF export.
Formatters & Beautifiers
Beautify, format, or minify your code and data structures. Includes support for popular languages like HTML, CSS, JS, JSON, SQL, and more.
HTML Formatter
Beautify or minify your HTML code for readability or performance.
CSS Formatter
Beautify or minify your CSS code for readability or performance.
JavaScript Formatter
Beautify, format, or minify your JavaScript code.
TypeScript Formatter
Beautify and format your TypeScript code using Prettier.
JSON Formatter
Format, validate, and beautify your JSON data for clarity.
SQL Formatter
Format and beautify your SQL queries for better readability.
XML Formatter
Neatly format your XML data into a readable, indented structure.
YAML Formatter
Beautify your YAML files with proper indentation and structure.
Java Formatter
Format your Java source code according to standard conventions.
PHP Formatter
Beautify your PHP code, adhering to PSR-1/PSR-2 standards.
Converters
Convert between different formats and encodings. From data formats like JSON/CSV to visual formats like Colors and Images.
JSON to Excel Converter
Convert JSON arrays into Excel or CSV with preview, smart fix, and spreadsheet export.
URL Encoder / Decoder
Encode or decode Uniform Resource Locators (URLs).
HTML Encoder / Decoder
Encode HTML characters to their entity equivalents or decode them.
Code Converter
Convert data between popular formats like JSON, YAML, and CSV.
Base64 Encoder / Decoder
Encode and decode text using Base64 encoding.
Markdown to HTML
Convert Markdown to HTML with a live preview. 100% client-side and secure.
Color Picker & Converter
Pick a color and convert it between HEX, RGB, and HSL formats.
CSS Unit Converter
A utility to convert between pixels, rems, ems, and other CSS units.
Timestamp Converter
Convert a timestamp to a human-readable date and vice-versa.
Time Converter
Convert between different time units (seconds, minutes, hours, days, etc.).
API & Validation
Test APIs, inspect tokens, validate patterns, and debug request payloads in the browser.
API Tester
Send lightweight browser-based API requests, inspect responses, and export the result.
cURL Command Generator
Build copy-ready cURL commands from methods, params, headers, auth, and body data.
Regex Tester
Test your regular expressions in real-time, explain the pattern, and export matches.
JWT Debugger
Decode JWT header and payload locally to inspect claims, expiry, and issuer fields.
Image Tools
Convert, compress, resize, export, and transform images directly in the browser.
Image Format Converter
Convert images between PNG, JPG, and WEBP with preview and quality settings.
Image to Base64
Convert uploaded image files into Base64 data URLs.
Base64 to Image
Turn Base64 image data into a previewable and downloadable image.
SVG to PNG Converter
Convert SVG markup or files into PNG images in the browser.
PNG to WEBP Converter
Convert PNG images into lighter WEBP files.
JPG to WEBP Converter
Convert JPG or JPEG images into WEBP output.
Image Resizer
Resize images with custom width and height controls.
Image Compressor
Compress images using quality and max-width settings with auto-run and export-ready output.
ICO Converter
Convert PNG and JPG assets into `.ico` favicon files.
Image Effects Studio
Apply blur, grayscale, rotate, flip, and crop controls to images.
Text / String Utilities
Manipulate, analyze, and transform text strings. Perform diffs, sort lines, change case, and more.
Text Difference Highlighter
Compare two blocks of text and highlight the differences.
CSV Diff Viewer
Compare two CSV files side-by-side and highlight the differences.
Text Case Converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, and more.
Find and Replace
Find all occurrences of a word or phrase and replace them.
Add Prefix/Suffix
Add a custom prefix or suffix to every line of text.
Reverse Text
Reverse characters, words, or entire lines of text instantly.
Word & Character Counter
Count words, characters, sentences, and paragraphs in your text.
Remove Duplicate Lines
Effortlessly remove any duplicate lines from a block of text.
Strip HTML Tags
Remove all HTML tags from text, leaving only the plain content.
Whitespace Remover
Remove extra spaces, tabs, and empty lines from your text.
Add Line Numbers
Add sequential line numbers to the beginning of each line.
Sort Text Lines
Sort lines of text alphabetically (A-Z, Z-A) or by line length.
Generators
Generate code, data, hashes, and other useful content for your projects.
Hash Generator
Generate MD5, SHA-1, SHA-256, or SHA-512 hashes from your text instantly.
UUID Generator
Generate random UUIDs (v1 and v4) instantly.
Random Password Generator
Generate secure, strong, and random passwords.
Random String Generator
Generate cryptographically strong random strings with customized characters.
Random Number Generator
Generate single or multiple random numbers between a custom range.
Git Ignore Generator
Generate a .gitignore file for your project by selecting relevant templates.
Data Faker / Mock JSON
Generate massive amounts of fake data (JSON) based on a custom schema.
CSV to SQL Converter
Convert CSV, Excel (XLSX), and JSON files to SQL INSERT/CREATE scripts instantly. Privacy-focused, client-side only.
QR Code Generator
Generate QR codes for URLs, text, Wi-Fi, and more.
CSS Gradient Generator
Create and customize CSS gradients (linear and radial).
Box Shadow Generator
Visually build and customize box-shadow CSS properties.
SVG Placeholder Generator
Generate simple SVG placeholder shapes with custom dimensions and colors.
Typography Scale Generator
Create a harmonious set of font sizes for headings and paragraphs.
CSS Clip-Path Generator
A visual editor to create custom shapes with the clip-path property.
Network & Simulators
Tools to simulate network requests and test APIs.
Date & Time Tools
A collection of tools to help you with date and time calculations.
Fun & Learning Tools
Interactive tools to create puzzles and engage students or audiences.
Calculators
A collection of utility calculators for financial and design tasks.
Aspect Ratio Calculator
Calculate height based on a width and an aspect ratio (e.g., 16:9).
GST Calculator
Calculate Goods and Services Tax (GST) for any amount.
Compound Interest Calculator
Calculate the future value of an investment with compound interest.
Loan Repayment Calculator
Estimate monthly payments and total interest for a loan.
Financial Documents
Generate standard financial documents like vouchers and slips.
Petty Cash Voucher
Generate and download a petty cash voucher.
Accounting Sheet
Create and download a simple accounting ledger sheet.
Expense Voucher
Generate and download an expense voucher/reimbursement slip.
Time Sheet
Create and download a weekly time sheet / attendance card.
Cash Deposit Slip
Generate and download a cash deposit slip.
Cash Withdrawal Slip
Generate and download a cash withdrawal slip.
Health & Fitness Tools
Tools for health and fitness calculations.