Simple Tools

Compress HEIC photos, merge PDFs, generate QR codes, and run date calculators fully in your browser—no uploads required.

Document Processing

Online PDF editing, merge, split, and document utilities

PDF Tools

Free PDF merge, split, and rotate — secure processing in your browser

Paper Generator

Instantly generate grid, manuscript, and staff paper A4 PDF templates

PDFGridManuscript

Date & Time

Online date calculators for age, business days, and era conversions

Japanese Era & Age Calculator

Calculate Japanese era, age, zodiac, and school grade from a birthdate

Japanese eraAgeGrade

Business Days Calculator

Count business days, deadlines, and lead times with holiday settings

business dayscalendarworking days

Conversion & Encoding

Convert and compress text or images entirely in the browser

QR Code Generator

Generate high-resolution QR codes and export as SVG, PNG, or PDF with brand colors

QRbarcodegenerator

Image Compressor & Converter

Convert HEIC/HEIF, JPEG, PNG, or WebP and compress with quality or size controls. Runs entirely in your browser

imagecompressionconverter

Word Play

Japanese word search helpers for shiritori and vocabulary drills

Shiritori Word Finder

Filter shiritori-friendly words by starting kana and length, with readings and endings at a glance

shiritoriword finderjapanese

Completely free - No registration required - Secure browser-only processing

Trust & Reliability

We share how the tools are maintained and answer common questions to help you evaluate the service.

About the project

Mochimochi Kit is a collection of tools developed and maintained independently. We focus on providing simple, practical utilities for everyday tasks.

Common questions

Is any data uploaded?: No. All calculations run locally in your browser—no files or text leave your device.
Can I use the tools commercially?: Yes. They are free to use without attribution for business workflows, classrooms, or client projects.
How do I report issues or request features?: Use the contact form in the footer or send a DM to ourmaintainer’s X accountfor a quick response.