Free Private Developer Tools

Validate, compare, encode, and verify data without pasting sensitive values into a remote service. These tools run in this browser tab. Nothing you enter or select is uploaded.

JSON Schema Validator

Check JSON data against a JSON Schema locally.

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JSON Diff

Compare two JSON documents and find every change.

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File Hash Checker

Create and verify a SHA-256, SHA-1, SHA-512, or MD5 checksum for a file in your browser.

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Base64 Encoder & Decoder

Encode or decode text as Base64 without sending it anywhere.

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QR Code Generator

Create a QR code from text or a link, download as PNG or SVG.

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QR Code Scanner

Read a QR code from an image file.

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Password Generator

Generate a strong random password locally.

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Password Entropy Checker

Type a password and see its real bit-entropy and rough crack time.

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UUID Generator

Generate random UUIDs (v4), one or in bulk.

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Favicon Generator

Generate a full favicon set — all sizes, favicon.ico, and a web manifest — from one image.

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Create a ZIP File

Combine multiple files into one compressed ZIP archive.

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Extract Files From a ZIP

Unzip a ZIP archive and download the files inside.

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