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 up to 80% smaller — in your browser, no upload. Batch 20 images, adjust quality, compare before & after. Free & private.
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.
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.
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 & Rankine instantly. Free online browser-based tool with conversion formulas, step-by-step guides and reference charts.
Unix Timestamp & Epoch Converter — Multi-Precision
datetime
Convert Unix timestamps to dates instantly. Auto-detects seconds, milliseconds & microseconds. Live clock, bidirectional. Free & private.
URL Encoder & Decoder with Built-in URL Parser
encoding
Decode or encode URLs in real time with built-in URL parser. Dual mode: encodeURI & encodeURIComponent. 100% private, no data sent to any server.
UUID Generator & Decoder — v1, v4, v5, v7 Batch Mode
security
Free UUID generator — create v1, v4, v5, v7 UUIDs instantly. Decode & validate any UUID. Batch generate up to 50. No signup, 100% browser-based.
Volume & Liquid Measurement Converter — 15 Units
conversion
Convert volume & liquid capacity between 15 units — metric, US customary, imperial & cooking. Free online converter, 100% private, runs in your browser.
Browse by Category
Find tools organized by their function
Encoding & Formatting
3 toolsConvert and format data between different encodings and formats
Security Tools
3 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
CSV to JSON Conversion: Methods, Pitfalls & Code Examples
Convert CSV to JSON (and back) with Python, JavaScript & CLI tools. Covers encoding traps, type coercion and streaming large files.
Password Entropy: Calculate & Strengthen Your Passwords
Master password entropy: the formula, brute-force math, and why length beats complexity. Includes JS/Python code and a free generator.
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.