Developer Tools That Run in Your Browser
Free. Fast. Secure. No tracking. All processing happens locally in your browser. Your data never leaves your device.
Popular Tools
Most used developer utilities and converters
Number Base Converter — Binary, Hex, Decimal & Octal
conversion
Convert between binary, hex, decimal, octal and any base (2-36) instantly. Free, private — all processing in your browser.
Base64 Decoder & Encoder
encoding
Decode and encode Base64 online for free. Real-time conversion with full UTF-8 and emoji support. 100% private — runs in your browser. No signup needed.
Compress Images Online — JPEG, PNG & WebP
conversion
Compress JPEG, PNG, WebP & AVIF up to 80% smaller — in your browser, no upload. Batch 20 images, resize, compare before & after, download as ZIP. Free & private.
JSON Diff & Compare
encoding
Compare two JSON files instantly in your browser. Side-by-side highlighting, RFC 6902 JSON Patch output, ignore noisy fields like timestamps and IDs. 100% private, no upload.
JSON Formatter & Validator
encoding
Format, validate and beautify JSON instantly in your browser. Free online tool with syntax validation, error detection, minify and one-click copy. 100% private.
JSON to YAML Converter
encoding
Paste JSON, get YAML instantly. Live conversion in your browser. K8s/Compose-ready, 2/4-space indent, smart quoting. 100% private, no upload.
JWT Decoder
security
Decode JWT tokens online with our free JWT decoder. Instantly inspect header, payload, signature, expiration, algorithm, and claims. 100% browser-based — your token never leaves your device. No signup, no tracking.
Length Unit Converter — Metric, Imperial & More
conversion
Convert between 16 length units instantly — metric, imperial, nautical & astronomical. 1 inch = 2.54 cm. Free, private, runs in your browser.
MD5 Hash Generator & File Checksum Tool
security
Generate MD5, SHA-256, SHA-1 & SHA-512 hashes online for free. Hash text or files in your browser, verify checksums and copy results. No signup needed.
QR Code Generator — URL, WiFi, vCard, Email, SMS, Geo
encoding
Free QR code generator. Make static QR codes for URL, WiFi, vCard, email & SMS. SVG & PNG download. No expiration, no signup, 100% in your browser.
Random Password Generator — Customizable, Strong & Secure
security
Generate strong random passwords instantly — free, 100% in your browser. Customize length & characters, batch up to 50 with entropy analysis.
Temperature Converter — Celsius, Fahrenheit, Kelvin, Rankine
conversion
Convert Celsius, Fahrenheit, Kelvin and Rankine instantly. Free online browser-based tool with conversion formulas, step-by-step guides and reference charts.
Browse by Category
Find tools organized by their function
Encoding & Formatting
7 toolsConvert and format data between different encodings and formats
Security Tools
4 toolsHash generators, encryption utilities, and security validation tools
Date & Time
1 toolUnix timestamp converters, timezone tools, and date formatters
Conversion Tools
6 toolsUnit converters, number system converters, and data transformation utilities
Latest from the Blog
Developer tutorials, guides, and insights
Static vs Dynamic QR Codes — Why Yours Stops Working
Dynamic QR codes expire when their redirect service shuts down. Static QR codes never expire. Why the difference matters and how to choose.
How to Ignore Timestamps and IDs in JSON Diff (Without Writing jq)
API regression diffs are 80% noise — timestamps, request IDs, UUIDs that mutate per-request. Use Extended JSON Pointer patterns to surface only meaningful changes.
Your Data Stays Private
All processing happens in your browser — nothing is sent to external servers. No tracking, no cookies, no data collection. Most tools even work offline.