# MetaForge Online Tools

> MetaForge is a free collection of browser-based developer, file, image, spreadsheet, PDF, and ecommerce tools. Files and data are processed locally whenever the selected tool supports it.

Last updated: 2026-08-10

## Primary tools
- [JSON Formatter and Validator](https://www.metaforge.cn/developer/json): Format, validate, fold, and copy JSON. It also normalizes common JSON-like inputs such as single-quoted strings and Python-style True, False, and None values.
- [Merge Excel and CSV Files](https://www.metaforge.cn/utility/excel-merge): Preview XLSX, XLS, and CSV sheets; keep sheets separate or combine rows with user-controlled headers and source labels.
- [Batch Image Cropper](https://www.metaforge.cn/utility/crop-image): Set an output aspect ratio and size, adjust an independent crop area for each image, and download processed images in one batch.
- [ROAS and ROI Calculator](https://www.metaforge.cn/ecommerce/roas-roi): Calculate ROAS, ROI, CPA, break-even ROAS, contribution profit, and target revenue for ecommerce campaigns.

## Categories
- [Developer Tools](https://www.metaforge.cn/developer): JSON, Base64, JWT, timestamps, UUIDs, hashes, format conversion, Cron expressions, regular expressions, and frontend previews.
- [Ecommerce Tools](https://www.metaforge.cn/ecommerce): Profit margin, marketplace fees, ROAS, ROI, discounts, inventory turnover, shipping, and packaging cost calculators.
- [File and Productivity Tools](https://www.metaforge.cn/utility): Excel and CSV merging, PDF and image processing, text differences, media comparison, file metadata, and clipboard workflows.

## Developer tools
- [Base64 Encoder and Decoder](https://www.metaforge.cn/developer/base64): Convert text or files to Data URLs and decode Data URLs back to text, images, media, or downloadable files.
- [JWT Decoder](https://www.metaforge.cn/developer/jwt): Inspect JWT headers and payloads and check expiration timestamps without sending the token to a server.
- [Unix Timestamp Converter](https://www.metaforge.cn/developer/timestamp): Convert Unix timestamps and date-time values with format validation.
- [UUID Generator](https://www.metaforge.cn/developer/uuid): Generate UUID v4 and v7 identifiers in batches.
- [QR Code Generator](https://www.metaforge.cn/developer/qrcode): Generate downloadable PNG or SVG QR codes from text and URLs.
- [Hash Generator](https://www.metaforge.cn/developer/hash): Calculate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text and files.
- [JSON, YAML and ENV Converter](https://www.metaforge.cn/developer/converter): Convert between JSON, YAML, and environment-variable formats.
- [Cron Expression Tool](https://www.metaforge.cn/developer/cron): Build and explain Cron expressions and preview upcoming run times.
- [Regular Expression Tester](https://www.metaforge.cn/developer/regex): Test ECMAScript regular expressions with highlighted matches and capture groups.
- [Frontend Code Preview](https://www.metaforge.cn/developer/frontend-preview): Run and preview HTML, CSS, and JavaScript snippets in the browser.

## Ecommerce tools
- [Profit Margin Calculator](https://www.metaforge.cn/ecommerce/profit-margin): Calculate net profit, net margin, break-even price, and break-even ROAS.
- [Marketplace Fee Calculator](https://www.metaforge.cn/ecommerce/platform-fee): Calculate commission, payment fees, fixed charges, and seller proceeds.
- [Discount Calculator](https://www.metaforge.cn/ecommerce/discount): Calculate final prices and effective discount rates after coupons and stacked discounts.
- [Inventory Turnover Calculator](https://www.metaforge.cn/ecommerce/inventory-turnover): Calculate turnover days, sell-through, stock coverage, and reorder points.
- [Shipping Cost Calculator](https://www.metaforge.cn/ecommerce/shipping-cost): Estimate weight-based shipping, packaging, warehouse, and fulfillment costs.

## File and productivity tools
- [PDF to Image Converter](https://www.metaforge.cn/utility/pdf-to-image): Render PDF pages as PNG or JPEG and download individual images or a ZIP archive.
- [Image Converter, Compressor and Cropper](https://www.metaforge.cn/utility/image-converter): Convert PNG, JPEG, and WebP files, compress images, or crop with per-image selections.
- [Text Difference Checker](https://www.metaforge.cn/utility/text-diff): Compare two texts by character, word, or line in unified and side-by-side views.
- [Image Comparison Tool](https://www.metaforge.cn/utility/image-compare): Compare local images side by side with synchronized zooming.
- [Video Comparison Tool](https://www.metaforge.cn/utility/video-compare): Compare local videos with synchronized playback and seeking.
- [PDF Comparison Tool](https://www.metaforge.cn/utility/pdf-compare): Render local PDFs side by side with synchronized scrolling.
- [File Metadata Inspector](https://www.metaforge.cn/utility/file-meta): Inspect PNG dimensions, color type, gamma, ICC data, text chunks, and chunk structure.

## Site information
- [About MetaForge](https://www.metaforge.cn/about)
- [Privacy Policy](https://www.metaforge.cn/privacy)
- [Terms of Service](https://www.metaforge.cn/terms)
- [XML Sitemap](https://www.metaforge.cn/sitemap.xml)
- [Robots Rules](https://www.metaforge.cn/robots.txt)