Free Tools for Mercari &amp; Yahoo Auctions

Listing Translator

Paste any Japanese Mercari listing and understand it in English. Safety warnings for risky sellers included.

Disposal vs Selling Calculator

Compare sodai-gomi trash disposal fees vs Mercari profit. See how much you save by selling.

Mercari Vocabulary Flashcards

100 essential Japanese terms for flea market apps. Interactive flashcards + quiz mode.

Japan Address Formatter

Format your Japanese address correctly for Mercari shipping labels and official forms.

Market Price Checker

See what items actually sell for on Mercari Japan by category, brand, and condition. Know your price before listing.

Jimoty Listing Template

Create Japanese listings for Jimoty — Japan's zero-fee local classifieds. Bilingual output: read English, paste Japanese.

Trending Categories

What's selling on Mercari Japan this month? Top 10 categories + rising trends + what to avoid.

Japanese Message Generator

Bilingual message templates for Mercari, Yahoo Auctions, and Rakuma. Copy-paste Japanese text with a plain English translation alongside it.

Beginner Guide for Foreigners

Answer 2 quick questions and get personalized tool recommendations for foreign sellers. Free, no login needed.

Seller Type Quiz

Answer 10 quick questions to find your flea market selling style — Careful, Speed, Reseller Pro, Decluttering, or Balanced.

Monthly Report Card

Track your monthly sales and profit, get a report-card grade, and monitor Japan's ¥200,000 tax-filing threshold.

Profit Calculator

Calculate net profit after platform fees and shipping costs.

Reverse Price Calculator

Calculate minimum listing price from your target profit.

Fee Comparison

Compare fees across Mercari, Yahoo Auctions, Rakuma & PayPay.

Shipping Calculator

Find the cheapest shipping method based on size and weight.

ROI Calculator

Calculate return on investment for reselling. Includes hourly wage.

Pricing Assistant

Category benchmarks, negotiation buffer tips, and sold-listing strategy for pricing on Mercari.

Tax Checklist for Foreigners

Do you need to file taxes on Mercari income? Interactive checklist with visa and threshold context.

Tax Calculator

Estimate taxes on flea market income in Japan.

Shops vs Individual Profit Comparison

Compare annual take-home pay between Mercari Shops and an individual account, including tax deductions and ban-risk tolerance.

Side Income Simulator

Calculate how many items you need to sell per month to hit your income goal, plus the Japan tax-filing threshold.

Buyback vs Selling Comparison

Compare selling to a recycle/buyback shop vs listing it yourself on Mercari, accounting for fees, shipping, and effort.

Price Negotiation Simulator

Calculate your minimum acceptable price and get bilingual reply templates for declining or accepting offers.

Template Generator

Generate SEO-optimized product descriptions by category.

Title Generator

Create product titles that sell. Optimized for search.

Hashtag Generator

Get hashtag suggestions for better discoverability.

Prohibited Word Checker

Check for banned words before listing.

Profile Generator

Write a Japanese seller profile in 30 seconds. Paste directly into Mercari — no Japanese needed.

Seasonal Selling Calendar

Month-by-month guide to what sells in Japan. Cultural context included for foreign sellers.

Listing Converter

Convert your Mercari listing to Yahoo Auctions format (or vice versa). Adapts condition grades automatically.

Foreigner Essential

Japanese Comment Templates

Ready-made Japanese replies for price negotiations, questions, and cancellations. Bilingual: read English, copy Japanese.

One-Click Japanese Greetings

Instant copy-paste Japanese messages for Mercari, Yahoo Auctions, and Rakuma. 6 common situations covered — greeting, shipping notice, thanks, delay apology, price decline, and questions.

SEO Keyword Tool

Find high-traffic keywords for Mercari and Yahoo Auction listings. Boost visibility and sell more.

Product Description Translator

Translate your flea market listings between Japanese and English. List on Mercari Japan with ease.

Image Resize & Compress

Resize to platform specs & reduce file size.

Watermark Tool

Add watermarks to protect your photos from theft.

Square Crop

Crop photos to square format for flea market apps.

Photo Grid

Combine multiple photos into one image.

Photography Tips

Lighting, backgrounds, angles, and quick editing tips to take photos that sell faster on Mercari.

White Background Guide

DIY white background setup, recommended apps, and a privacy checklist for your listing photos.

Fake Item Checker

Authentication tips for checking brand items.

Condition Checker

Objectively evaluate and grade item condition.

Review Generator

Generate polite Japanese review comments. Copy & paste ready.

Trouble Resolution Guide

Step-by-step dispute guide for foreigners: item not received, wrong item, cancellations. Japanese terms explained.

Trouble Message Templates

Bilingual dispute templates: item not received, wrong item, damage, fakes, cancellations, unfair reviews. Distinct from the routine Message Generator.

Packing Guide

Category-by-category packing instructions. Materials from 100-yen shops, step-by-step photos.

Convenience Store Shipping

Step-by-step guide for 7-Eleven, FamilyMart, Lawson, and PUDO. What to say at the register.

Packing Size Checker (Mercari)

Enter dimensions and weight — instantly see which Mercari-only shipping methods fit and which is cheapest.

Shipping Size Guide (All Platforms)

Compare every Mercari, Yahoo Auctions, and Rakuma shipping method by size and find the cheapest across all three.

Shipping Method Finder

Answer 3 questions to find the cheapest shipping method. Explains anonymous shipping (匿名配送) and carrier differences.

Sales Tracker

Track sales, purchases, and profits.

Packaging Recommendation Tool

Get packaging recommendations for shipping flea market items in Japan. Protect items and minimize costs.