Free browser tools

One job per page, no account, nothing uploaded. Each tool is a single HTML file that runs locally.

• CSV Diff — Compare Two Price Lists

  Paste a before and an after CSV and see exactly which rows were added, removed, or changed, column by column.

• CSV to JSON Converter

  Turn a CSV table into a JSON array with proper quoting, delimiter auto-detection and header mapping. No upload.

• Remove Duplicate Lines

  Paste any list and drop the duplicates instantly — case and whitespace aware. Runs in your browser, nothing uploaded.

• Excel (XLSX) to JSON

  Drop an .xlsx file and get a JSON array back. Parsed in your browser with the built-in decompressor, no upload, no library.

• Feed Validator for Google & Meta

  Paste a product CSV and see which row breaks the import: missing columns, non-numeric prices, impossible GTIN lengths.

• JSON Validator & Formatter

  Validate JSON, find the exact line and column of a syntax error, then format or minify it in one click.

• GTIN & Barcode Validator

  Check GTIN-8/12/13/14 lengths and check digits in bulk, and see the zero-padded value you probably meant.

• JSON Schema Validator

  Validate a payload against a JSON Schema and see the exact path of every violation: type, required fields, enum, nested items.

• Title & Meta Description Length Checker

  See how long your page title and meta description really are in characters and estimated pixels, and where Google will cut them.

• Strip Tracking Parameters from URLs

  Remove utm_*, fbclid and other tracking junk from any list of links in one paste, while keeping the parameters that matter.