OPENVIST TOOLS · FREE TO USE
Small tools. Useful answers.
Validate data, compare documents, test patterns and create code images. Clear inputs, useful results, no account required.
Runs locally in your browserJSON & structured data
JSON Validator & Formatter
Validate, format or minify JSON while preserving the original numeric tokens.
Open toolJSON Compare
Compare two JSON documents by structure and find added, removed or modified values.
Open toolCSV ↔ JSON Converter
Convert CSV records to JSON or flat JSON objects to CSV, with optional column selection.
Open toolCSV Comparator
Compare two CSV files by an identifier column and find added, removed and modified rows.
Open toolDuplicate & Conflict Finder
Find repeated identifiers and identifiers associated with different text values in CSV or JSON.
Open toolText & code
Text Diff
Compare two texts line by line and identify additions, removals and unchanged lines.
Open toolRegex Tester — JavaScript
Test a JavaScript regular expression locally, highlight matches and inspect numbered and named capture groups.
Open toolCode to Image
Turn a short code example into a polished PNG for documentation, tutorials or social posts, locally in your browser.
Open toolEncoding & checksums
Base64 Encoder & Decoder
Encode text or a file as Base64, or decode Base64 as UTF-8 text or a binary download.
Open toolURL Encoder & Decoder
Encode or decode a URL component and inspect query parameters, including repeated names.
Open toolSHA-256 Checksum Calculator
Calculate a SHA-256 checksum from text or a file and compare it with an expected value locally.
Open toolWebsite checks
Your inputs stay with you
These tools process pasted text and selected files locally. Data tools use a browser worker; sitemap XML uses the local XML parser, and Code to Image draws text using Canvas. Their processing code does not upload your inputs, use an AI API or save them to browser storage. Site analytics, when enabled by your consent, follow the site's privacy policy.
Start with an example before using your own data. These tools do not replace validation for your own system or workflow.