Developer Tools

Public Webpage Source Viewer

Fetch and inspect bounded public HTML source with line numbers and a downloadable text copy.

PWA Manifest Generator & Validator

Create and validate a web app manifest with names, icons, display mode, colours and start URL.

Regex Tester

Test regular expressions against sample text.

Responsive Image srcset Generator

Create responsive srcset, sizes and picture markup from image filenames and width variants.

SQL Formatter

Format and indent SQL queries for easier reading.

SRI Hash Generator

Generate SHA-256, SHA-384 or SHA-512 Subresource Integrity values for a local file or public asset.

SSH Public Key Fingerprint Viewer

Calculate SHA-256 and legacy MD5 fingerprints from an OpenSSH public key.

SSL Certificate Decoder

Decode a pasted PEM certificate without transmitting it.

Text Encoding Converter

Read UTF-8, UTF-16 or Latin-1 text and export it as UTF-8 or UTF-16.

Timestamp Converter

Convert Unix timestamps and readable dates.

URL Encoder Decoder

Encode and decode URLs or query strings.

URL Parser & Query Builder

Parse URL components, edit query parameters and rebuild an encoded URL.

User-Agent Parser

Identify common browser, rendering engine, operating system and device signals in a user-agent string.

UUID Generator

Generate random UUID v4 values.

ZIP / TAR Archive Converter

Convert between ZIP and uncompressed TAR archives locally.

ZIP File Creator

Compress multiple files into a ZIP archive in your browser.

ZIP File Extractor

Inspect and securely extract selected ZIP contents.