Small tools developers actually reach for.
Test files, JSON, Markdown, UUIDs, Base64, hashes, timestamps, entirely in your browser. Nothing is uploaded anywhere, there's no watermark, and no account to create.
Developer tools
Test File Generator
Generate a file of any size and extension: 100 KB PDF, 5 MB JPG, 20 MB BIN, 500 KB ZIP, for testing upload limits, dummy logins, or QA.
Open toolJSON Formatter
Format, validate, and minify JSON live as you type, with inline error location and a collapsible tree view.
Open toolMarkdown Editor
Split-pane markdown editor with a live rendered preview side by side. Export as HTML or Markdown.
Open toolUUID Generator
Bulk-generate random UUID v4 identifiers. Uppercase or no-hyphens formatting, copy one or copy all.
Open toolBase64 Encode / Decode
Text to and from Base64, UTF-8 safe. URL-safe variant, swap direction with one click.
Open toolHash Generator
MD5, SHA-1, SHA-256, and SHA-512 hashes computed live as you type, right in your browser.
Open toolTimestamp Converter
Unix timestamp to human-readable date, both ways. Local time, UTC, ISO 8601, and relative time.
Open toolJSON Diff
Compare two JSON documents and see what was added, removed, and changed.
Open toolJWT Decoder
Decode a JWT's header and payload, with expiry explained.
Open toolRegex Tester
Test a regular expression against sample text with live match highlighting.
Open toolCSV to JSON
Convert a CSV file into clean JSON.
Open toolCSV Viewer
View and edit a CSV as an editable table.
Open toolURL Encoder / Decoder
Percent-encode or decode a URL or component.
Open toolHTML Entity Encoder
Escape or unescape HTML entities.
Open toolYAML to JSON Converter
Convert YAML and JSON, both directions.
Open toolCron Expression Parser
Explain a cron schedule and preview next runs.
Open toolNumber Base Converter
Binary, octal, decimal, hex, and any base 2-36.
Open toolText Diff
Compare two texts line by line.
Open toolCSS Specificity Calculator
Paste selectors and see each one's specificity broken down and ranked in cascade order.
Open tool.gitignore Generator
Check off your stack, get a merged .gitignore with no duplicate lines.
Open toolJSON Schema Generator
Paste a JSON sample and get a draft-07 JSON Schema describing its shape and types.
Open toolUser-Agent Parser
Paste any User-Agent string and see the browser, engine, OS, and device type it identifies.
Open toolURL Parser
Paste any full URL and see its protocol, host, port, path, query, and hash broken out.
Open toolSVG Optimizer
Strip comments, metadata, editor cruft, and excess whitespace. See the size drop live.
Open toolSVG to React Component
Paste SVG markup, get a ready-to-import React functional component.
Open toolCSS Variable Extractor
Paste a stylesheet and pull out every custom property, grouped by prefix, duplicates flagged.
Open toolSVG Sprite Generator
Combine multiple SVG icons into one symbol-based sprite sheet with collision-safe IDs.
Open tool