Precision Tools for Modern Builders

Convert JSON ↔ YAML ↔ XML ↔ CSV ↔ Excel in your browser.

Free browser‑based Excel utilities: Merge sheets, Pivot builder, and SQL Studio.

Client‑side CSV tools: 15 converters, validators, and analyzers. No upload.

Convert CSV files to JSON instantly in your browser. No uploads required. Perfect for APIs, web apps, and data pipelines. Free, private, and secure.

Convert JSON arrays into CSV in your browser with upload, copy and download.

Convert CSV to Excel (.xlsx) instantly and download the file.

Upload multiple CSV files and merge them into one download.

Split a large CSV into multiple files by row count.

Remove duplicate rows by entire row or a specific column.

Format, validate, and minify JSON with a raw and tree view.

Free CSV validator that checks for malformed rows, duplicate headers, delimiter issues, and encoding problems. Runs entirely in your browser - no uploads required.

Render bar, line, or pie charts from CSV data.

Fix BOMs, normalize quotes, trim fields, and standardize delimiters.

Decode JWT header, payload, and signature fully client-side, with formatted JSON and copy/download.

Generate perfect SEO meta tags, Open Graph, and Twitter Cards with live previews. Free, instant, and privacy-focused. No uploads required.

Generate JSON‑LD for Article, FAQ, HowTo, Product, LocalBusiness, Breadcrumbs and more.

Create valid XML sitemaps by crawling a site or pasting URLs, with changefreq, priority, and lastmod options.

Generate robots.txt with allow/disallow rules, user-agents, crawl-delay, and sitemap.

Analyze keyword frequency and density from text; copy or download CSV/Excel.

Compare two texts side‑by‑side and copy changes.

Convert text between camelCase, PascalCase, snake_case, SCREAMING_SNAKE_CASE, kebab-case, Title Case, and sentence case.

Paste CSV and export a printable PDF of Avery 5160 labels (optional Code128 barcodes).

Combine images into a single PDF. Drag, reorder, export — all offline.

Combine multiple PDFs into one file in your browser.

Create .ics calendar events with timezone support.

Generate QR codes and download PNG/SVG.

Convert epoch ↔ date and across timezones.

Build URLs with query params and UTM presets.

Encode/decode text, files, and images to/from Base64 with copy/download and image preview.