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Developer Tools

Browser-based developer utilities for code, data, passwords, and QR. Your text stays on your device.

Developer Tools

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JSON Formatter & Diff

Developer Tools

Pretty-print, minify, and validate JSON, or compare two JSON documents to find added, removed, and changed values. Everything runs in your browser.

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Base64 Encode & Decode

Developer Tools

Encode text or a file to Base64, decode Base64 to text or a file, and use Base64URL. Conversion stays in your browser.

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Encode URL

Developer Tools

URL-encode or decode a component or a full URL with percent encoding in your browser. Unicode and emoji are supported.

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Generate UUID

Developer Tools

Create random UUID v4 values (GUIDs) in your browser. Make 1 to 100 at a time.

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Password Generator

Developer Tools

Generate a random password, passphrase, or PIN in your browser. Uses cryptographically secure randomness. Nothing is sent or stored.

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Generate Hash

Developer Tools

Hash text with SHA-1, SHA-256, SHA-384, or SHA-512 and copy hex or Base64. Hashing stays on your device.

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Date & Time Converter

Developer Tools

Convert date formats, Unix timestamps (epoch), time zones with DST, and calculate the difference between dates in your browser. Nothing is uploaded.

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QR & Barcode Maker

Developer Tools

Generate a QR code or barcode, or read a QR code from an image or camera. Scan a QR code from a photo in your browser. Nothing is uploaded to NEXNARA.

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Excel·CSV·JSON Converter

Developer Tools

Convert Excel, CSV, JSON, XML, and TSV in your browser. Turn CSV into XLSX, Excel into CSV, or JSON into a spreadsheet, then download the file. Nothing is uploaded.

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Excel·CSV Data Cleaner

Developer Tools

Clean Excel, CSV, and TSV in your browser. Find duplicates, filter and sort rows, drop empty data, edit columns, then download. Nothing is uploaded.

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Excel·CSV Merge & Compare

Developer Tools

Merge Excel, CSV, and TSV files or compare two spreadsheets in your browser. Find added, removed, and changed rows. Nothing is uploaded.

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File Utility

Developer Tools

Batch rename files with prefix, suffix, numbering, and find & replace, or export a file inventory to CSV, TXT, or JSON in your browser. Nothing is uploaded.

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