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Browse 521 free tools by topic, including CSV, e-commerce, images, design, dates, web development, and more.
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CSV & data tools (42)Free tools for inspecting CSV encoding and headers, finding duplicates, merging or splitting files, extracting columns, and filtering rows.Open →E-commerce import tools (49)Preflight tools for product-import CSVs used by Mercari Shops, BASE, STORES, Shopify, WooCommerce, ColorMe, and other e-commerce platforms.Open →Image & print tools (84)Tools for DPI, pixels, print dimensions, image conversion, resizing, compression, cropping, and other image-production tasks.Open →Random pickers & generators (16)Free tools for randomly picking names, numbers, seats, teams, orders, topics, and lightweight gacha-style results.Open →Date, business day & time tools (25)Tools for business-day calculations, date arithmetic, durations, ISO 8601, Unix timestamps, calendars, countdowns, and time conversion.Open →Color & CSS design (18)Tools for converting RGB, HEX, and HSL values and picking colors from images for web and design work.Open →File, storage & transfer (23)Tools for estimating upload, download, network transfer, disk copy, migration time, and storage-unit conversions.Open →Web developer tools (138)Utilities for URLs, HTTP, JSON, HTML, CSS, JWT, regex, hashes, UUIDs, Markdown, SQL, and other everyday web-development tasks.Open →Text & list tools (37)Tools for counting, deduplicating, sorting, comparing, replacing, extracting, and transforming text and line-based lists.Open →Business & everyday calculators (37)Small calculators for margin, markup, discounts, tax, hourly rates, work time, unit prices, electricity, travel costs, and everyday arithmetic.Open →Publishing & event tools (25)Tools for spine width, cover dimensions, DPI, box counts, inventory, break-even, cash float, packing, and publishing or convention preparation.Open →Marketing & CRM tools (27)Tools for preparing and validating Klaviyo, Google Ads Customer Match, Merchant Center, UTM, and other marketing data.Open →