DevToolkit - Free Online Developer Tools

YouTube, Reels & TikTok Thumbnail Creator

Design click-worthy thumbnails with custom text shadows, neon strokes, and exact aspect ratio presets. Drag text directly on canvas.

Interactive Canvas (Click & Drag Text to Position) 1280 x 720

High Click-Through-Rate (CTR) Thumbnails

Thumbnails with high-contrast text, clear bold typography (such as Bebas Neue or Montserrat), and contrasting stroke borders dramatically improve video impressions across YouTube, TikTok, and Instagram feeds.

Photo Resizer & Multi-Format Converter

Quickly resize images by custom pixels and convert seamlessly between PNG, JPG, and modern WebP formats in browser memory.

Image Live Preview & Details -
Upload an image to inspect details

Optimizing Modern Web & Media Assets

WebP delivers 25-34% smaller file sizes compared to standard JPEG while preserving pristine visual quality. Resizing large camera files down to target web dimensions accelerates page load times and boosts SEO rankings.

Image to PDF Converter

Convert JPG, PNG, and WebP images into a single clean PDF document directly in your browser without uploading to any server.

No images selected

Privacy-First Client-Side Image to PDF Conversion

Standard online PDF converters upload sensitive photographs or documentation to remote cloud instances. This tool processes every pixel inside local browser memory via JavaScript, providing zero network transmission and enterprise-grade data protection.

Word & Character Counter

Real-time word, character, sentence, paragraph counter, and reading time estimator for essays, blogs, and social posts.

0
Words
0
Characters
0
No Spaces
0
Sentences
0m
Read Time
Input Text / Essay / Post

Social Media Character Count Limits

Track character limits for major platforms: Twitter/X: 280 chars | LinkedIn Post: 3,000 chars | Instagram Caption: 2,200 chars | TikTok Description: 2,200 chars.

Quick QR Code Generator

Create high-quality downloadable PNG QR codes for URLs, text, contacts, and Wi-Fi networks.

Content / URL / Text

Generate Free Dynamic & Static QR Codes

Generate scannable QR codes for restaurant menus, student project portfolios, Wi-Fi logins, and business cards without third-party watermarks.

Social Media Fancy Font Generator

Convert normal text into stylish Unicode bold, italic, script, and monospace fonts for Facebook, Instagram bios, and TikTok captions.

Bold Sans
Italic Sans
Monospace / Code
Circled / Bubble

Unicode Formatting across Social Platforms

These generated fonts utilize standard Unicode character variations, ensuring compatibility across iOS, Android, macOS, and Windows without needing third-party font packs.

JSON to Python Pydantic Model

Generate strongly-typed Pydantic v2 schemas directly from raw JSON payloads for FastAPI and modern Python services.

Raw JSON Payload
Pydantic v2 Class

JSON to Python Dataclass

Generate clean Python 3.10+ standard library @dataclass structures without third-party dependencies.

Raw JSON Payload
Python @dataclass

Docker Run to Docker Compose

Transform command-line docker run commands into clean, reproducible docker-compose.yml configurations.

Docker Run Command
docker-compose.yml

Linux Chmod Permissions Calculator

Calculate octal numbers, symbolic notation, and Linux permission flags interactively.

Permission Level Read (4) Write (2) Execute (1)
Owner / User
Group
Others / Public

JSON Formatter & Validator

Format, beautify, minify, and inspect JSON structures directly in the browser.

Input JSON
Formatted Output

Base64 String Encoder & Decoder

Convert plain ASCII text to Base64 strings or decode encoded payloads securely.

Input Text
Result

JWT Token Claims Decoder

Decode JSON Web Tokens and inspect header configurations and payload claims.

JWT Token
Parsed Claims

SQL Query Beautifier

Format unorganized SQL statements into clean, indented clauses.

Raw SQL
Formatted SQL

Regular Expression Match Tester

Test pattern matches instantly against multi-line test inputs.

Test Strings
Extracted Matches

YAML ↔ JSON Configuration Converter

Bi-directional conversion between YAML infrastructure files and JSON payloads.

Input (YAML or JSON)
Converted Payload

JSON to TypeScript Interface

Generate strongly typed TypeScript interfaces directly from raw API responses.

Sample JSON Payload
TypeScript Interface

cURL Code Generator

Convert command-line cURL network requests into modern JavaScript fetch and Python requests snippets.

cURL Command
Generated Code

String Case Converter

Transform variable and file names across camelCase, PascalCase, snake_case, and kebab-case.

Normalized Case Formats

CSS Fluid Typography Calculator

Generate responsive clamp() formulas based on viewport boundaries.

Generated CSS Clamp
font-size: clamp(1rem, 2vw + 1rem, 1.5rem);

UUID / ULID Generator

Generate secure random UUID v4 identifiers client-side.

Generated Identifiers
Click Generate to produce UUIDs...

Cryptographic Hash Generator

Calculate cryptographic SHA-256 digests securely within your browser.

SHA-256 Checksum
SHA-256:

Unicode Escape Utility

Convert Myanmar text or special characters into \uXXXX escaped strings.

Input Text
Result

CSV / Tabular to Markdown Table

Convert comma-separated or tabbed values into clean Markdown tables.

CSV Data
Markdown Code

.env File to JSON Converter

Parse environment configuration files into structured JSON objects.

.env Contents
JSON Output
Copied to clipboard!