Local-first data workbench · No account

Serious data tools. Nothing leaves your browser.

Format payloads, convert tabular data, debug patterns, and encode files in purpose-built workspaces—not one generic textarea repeated across hundreds of pages.

Open the workbench How local processing works

workspace.jsonlocal

{
  "input": "your browser",
  "upload": false,
  "tools": [
    "json", "csv", "regex", "base64"
  ]
}

4 Focused tools

0 Accounts needed

Local Input processing

Free To use

The working set

Four tools, each built as a product.

Find a data workflow

4 shown

BE Local tool

Base64 Encoder & Decoder

Encode or decode UTF-8 text and files with standard or URL-safe Base64, optional padding, previews, copy, and downloads entirely in your browser.

Updated 2026-08-03

Ct Local tool

CSV to JSON Converter

Convert CSV, TSV, semicolon, or pipe data to JSON with header controls, type inference, null handling, table preview, import, copy, and download.

Updated 2026-08-03

JR Local tool

JavaScript Regex Tester

Test JavaScript regular expressions with live match highlighting, flags, capture groups, indexes, replacement preview, presets, and copyable results.

Updated 2026-08-03

JF Local tool

JSON Formatter & Validator

Format, validate, minify, sort, search, and explore JSON in a collapsible tree. Import, copy, or download without uploading your data.

Updated 2026-08-03

01 / LOAD

Paste, drop, or open a file.

Each workspace accepts the formats people actually use and includes realistic samples for a quick check.

02 / REVIEW

Inspect before exporting.

Validation, tree or table previews, match groups, file metadata, and precise errors stay beside the output.

03 / EXPORT

Copy or download the exact result.

Choose the output shape, indentation, alphabet, or replacement you need—then take only that result.