Privacy-first web utilities (NO UPLOAD)

Simple tools that run 100% in your browser. Files never leave your browser. No accounts, no backend, no tracking.

JSON Validator

Validate JSON syntax locally in your browser. Clear errors, copy, and reset in one click.

Open tool Client-side only

Convert CSV (auto-detect delimiter, headers) into pretty JSON. Includes file upload (local only).

Open tool NO UPLOAD

Convert a JSON array of objects into CSV with simple 1-level flattening and instant download.

Open tool NO UPLOAD

Convert XML to JSON using DOMParser with clear errors. Copy or download the result.

Open tool NO UPLOAD

Turn each non-empty line into a JSON array element. Great for lists, allowlists, and configs.

Open tool NO UPLOAD

Content-first pages that answer long-tail questions and link to the right no-upload tools.

How to choose converters that run locally in your browser, and which tools to use for CSV/JSON/XML.

Read guide Privacy-first

Common “Unexpected token” causes, quick checks, and a no-upload validator workflow.

Read guide NO UPLOAD

Comma vs semicolon vs tab: why columns shift and how to detect the right delimiter quickly.

Read guide CSV

Fast “validate → pinpoint → fix” routine for debugging JSON locally without uploads.

Read guide JSON

How to keep columns stable with nested fields, missing keys, and 1-level flattening.

Read guide Export

Attributes, arrays, text nodes, namespaces: what to expect when converting XML locally.

Read guide XML

Quick audit to verify “no upload” claims and avoid leaking sensitive files.

Read guide Privacy

When to quote fields, how to escape quotes, and why newlines break rows.

Read guide Rules

Fix weird characters, broken headers, and BOM issues before converting CSV/JSON.

Read guide Encoding

View all guides