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Momo Toolbox
Online Tools

Momo Toolbox - Free Online Tools

21+ Curated Tools
Tools, but |

All data processed locally in your browser, instant and privacy-friendly.

Text1 tools

Markdown Editor

Live preview, export to HTML

Developer10 tools

JSON Formatter

Format, minify and validate JSON data

Base64 Encode/Decode

Encode and decode text and files

URL Encode/Decode

URL encode and decode conversion

Timestamp Converter

Unix timestamp conversion

Hash Generator

MD5, SHA256 hash calculation

JWT Decoder

Decode JWT tokens

UUID Generator

Generate UUID v4/v7 and ULID

Color Converter

Convert HEX/RGB/HSL/HSV

HTTP Status Code Lookup

Lookup 60+ HTTP status codes

Symmetric Encryption

AES-256-GCM/CBC & SM4 local encryption

Image3 tools

Image Compressor

Compress images locally

Image Splitter

4/9 grid for Instagram,朋友圈

AI Background Removal

ISNet neural network matting, batch supported

Productivity7 tools

QR Code Generator

Generate QR codes with logo

Password Generator

Strong random password generator

Unit Converter

Length, mass, temperature, and more

Pomodoro Timer

25/5/15 classic timer

Screen Recorder

Quality/Resolution/FPS/Format adjustable

Fullscreen Clock

Clock / Stopwatch / Countdown, fullscreen

Random Grouping

Shuffle names into groups, Web Crypto

About Momo Toolbox

Momo Toolbox is a free collection of online tools dedicated to providing fast, secure, and ready-to-use utilities for developers, designers, content creators, and everyday office users. All tools process data locally in the browser without uploading to servers, protecting your privacy at the root.

Currently offers 21 tools covering four categories: Developer tools (JSON formatter, Base64, URL encoder, timestamp converter, hash generator, JWT decoder, UUID generator, HTTP status codes, AES/SM4 encryption), Text tools (Markdown editor), Image tools (image compression, image splitter, AI matting), and Productivity tools (QR code generator, password generator, unit converter, pomodoro timer, screen recorder, fullscreen clock, random group).

The technical architecture is based on Astro + React + TypeScript, deployed on Cloudflare Pages global CDN for extremely fast loading. Supports Chinese-English bilingual interface switching, dark mode, and PWA desktop installation. Each tool comes with a detailed tutorial covering use cases, features, examples, best practices, and FAQ.

Tool Categories

Developer Tools (11)

Designed for frontend/backend development, API debugging, and config file editing. Includes JSON formatter, Base64/URL encoder, Unix timestamp converter, MD5/SHA/SM3 hash, JWT parser, UUID generator, HTTP status codes, AES-256 and SM4 encryption.

Image Tools (3)

Image compression with quality adjustment and format conversion; image splitter for 3x3 grid or custom rows/columns; AI matting based on ISNet neural network with fast/standard models, batch processing and PNG/WebP transparent background export.

Productivity Tools (6)

QR code generator with custom colors, logo embedding, and error correction; password generator with cryptographic random source; pomodoro timer and fullscreen clock for focus; screen recorder up to 120FPS; random group for classrooms and events.

Text Tools (1)

Markdown editor with live preview, GFM syntax (tables, task lists, code highlighting), one-click HTML export, and auto-save to browser.