Free Developer Tools
26 free browser-based tools for developers. Format JSON, encode Base64, generate hashes and UUIDs, decode JWTs, test regex patterns, send API requests and more. No signup, no installs — just open and use.
26 developer tools · No signup · No installs
JSON Formatter
Format, validate and minify JSON data with syntax highlighting. Detects errors and shows line numbers. Essential for debugging API responses.
JSON to TypeScript
Paste JSON and get TypeScript interfaces generated automatically. Handles nested objects, arrays and optional fields.
Base64 Encode/Decode
Encode text or files to Base64 and decode Base64 strings. Supports UTF-8, binary data and data URIs.
Base64 Image Encoder
Convert images to Base64 data URIs for embedding in HTML and CSS. Decode Base64 strings back to downloadable images.
URL Encode/Decode
Encode special characters for URLs or decode percent-encoded strings. Handles full URLs and individual components.
HTML Encode/Decode
Escape HTML entities to prevent XSS attacks or decode escaped HTML back to readable markup.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text input. Compare hashes to verify file integrity.
UUID Generator
Generate random v4 UUIDs/GUIDs. Bulk generate up to 100 at once. Copy individual IDs or the full list.
JWT Decoder
Decode JSON Web Tokens and inspect headers, payloads and signatures. Verify expiration times and claims.
JWT Generator
Create JWT tokens with custom claims, expiration times and signing algorithms. Test your auth flows.
Regex Tester
Test regular expressions with real-time highlighting, capture groups and match details. Supports JavaScript regex syntax.
API Tester
Send HTTP requests (GET, POST, PUT, DELETE) and inspect responses with headers. Add custom headers and request bodies.
CSV to JSON
Convert CSV data to JSON arrays or objects. Auto-detects delimiters and handles quoted fields.
Text Diff
Compare two texts side-by-side with highlighted additions, deletions and modifications. Works with code and prose.
Color Picker
Pick colours visually and get HEX, RGB, HSL and CSS values. Includes complementary and analogous colour suggestions.
Color Converter
Convert between HEX, RGB, HSL, CMYK and CSS named colours. Batch convert multiple values at once.
CSS Gradient Generator
Create linear, radial and conic CSS gradients with a visual builder. Export production-ready CSS.
Box Shadow Generator
Design CSS box shadows with multiple layers, blur, spread and colour controls. Live preview and one-click CSS copy.
Chmod Calculator
Calculate Linux file permissions with toggles for owner, group and others. Shows numeric and symbolic notation.
Cron Parser
Parse cron expressions into plain English descriptions. Shows next 10 execution times.
Cron Builder
Build cron expressions with a visual UI. Select minutes, hours, days and months without memorising syntax.
Slug Generator
Convert any text into URL-friendly slugs. Strips accents, special characters and normalises whitespace.
IP Info Lookup
Look up your IP address and get geolocation, ISP, timezone and network details.
HTML Preview
Write HTML, CSS and JavaScript and see a live preview. Useful for quick prototyping and testing snippets.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences or words. Customise the amount of dummy content.
SVG Optimizer
Minify SVG files by removing metadata, comments and unnecessary attributes. Reduce file size by 30-60%.
Why Browser-Based Developer Tools?
You do not always have access to your local dev environment. Maybe you are on a work laptop, pairing with a colleague, or reviewing code on a tablet. Browser-based tools give you instant access to essential utilities without installing anything.
Every tool on Toolpile processes data locally in your browser. Your code, tokens and API keys never leave your device — making these tools safe to use with sensitive data.
Toolpile — free developer tools, no nonsense. Browse all 194 tools