Conversion Tools
21 tools
Unit converters, number system converters, and data transformation utilities
Number Base Converter — Binary, Hex, Decimal & Octal
Conversion Tools
Convert between binary, hex, decimal, octal and any base (2-36) instantly. Free, private — all processing in your browser.
Two's Complement & Signed Integer Encoding Calculator
Conversion Tools
Type a signed integer and get sign-magnitude, ones' complement, two's complement and offset binary at once, at 4 to 64 bits. Or paste a bit pattern or hex byte and see all five readings side by side. Local, free, no sign-up.
chmod Calculator — Linux File Permissions
Conversion Tools
Convert Linux file permissions between octal (755, 644) and rwx symbols. Get chmod commands, spot risky settings like 777 — free, right in your browser.
Color Converter — HEX, RGB, HSL & OKLCH
Conversion Tools
Convert HEX to RGB, HSL, OKLCH, OKLAB and CMYK in your browser — copy any format with one click. Free, no signup, your colors never leave the page.
Lat Long & Coordinate Converter: DMS, UTM, GCJ-02
Conversion Tools
Free lat long converter: paste decimal, DMS or DDM in either order and get WGS84, UTM, Web Mercator plus China's GCJ-02 (AMap) and BD-09 (Baidu) at once. Iterative GCJ-02 inverse under 1 mm, batch CSV, runs in your browser.
Hex to CMYK Converter
Conversion Tools
Convert HEX colors to CMYK in your browser. Naive sRGB-based approximation for print previews. Free, no signup, your colors stay local.
Hex to HSL Converter
Conversion Tools
Convert any hex color to HSL in your browser — 3-digit, 6-digit, 8-digit alpha all supported. Free, instant, no signup, your colors never leave the page.
Hex to OKLCH Converter
Conversion Tools
Convert HEX to OKLCH for Tailwind v4 design tokens. Live perceptually-uniform output with Display P3 gamut warnings. Free, browser-only.
Hex to RGB Converter
Conversion Tools
Convert any hex color code to RGB in your browser — 3-digit, 6-digit, and 8-digit alpha hex all supported. Free, instant, no signup, your colors never leave the page.
IEEE 754 Floating-Point Converter
Conversion Tools
Convert floats to IEEE 754 hex & binary, or decode hex to float — FP16, FP32, FP64 and bfloat16. See the exact stored value, rounding error and bit layout. 100% in your browser.
Compress Images Online — JPEG, PNG & WebP
Conversion Tools
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.
LCD & OLED Font Generator (Bitmap to C Array)
Conversion Tools
Turn Chinese or English text and images into C arrays for SSD1306, SH1106, ST7920 and Adafruit GFX. Crisp 12×12 and 16×16 pixel fonts, all four PCtoLCD2002 scan modes, plus a decoder for unknown arrays.
Length Unit Converter — Metric, Imperial & More
Conversion Tools
Convert between 16 length units instantly — metric, imperial, nautical & astronomical. 1 inch = 2.54 cm. Free, private, runs in your browser.
PNG to ICO Converter (and ICO to PNG)
Conversion Tools
Convert PNG, JPG, SVG or WebP into a real multi-size .ico — 16, 32 and 48 px in one file, full alpha kept. Choose PNG or uncompressed BMP storage and see both sizes. Opens .ico files back up too.
PX to REM Converter — Convert Pixels to Rem
Conversion Tools
Convert px to rem instantly. 16px = 1rem at the default base, plus any custom root font-size. Free, live two-way conversion that runs 100% in your browser.
Q-Format Fixed-Point Converter
Conversion Tools
Convert Q7, Q15, Q31, Q1.15, and Q16.16 values between decimal, raw integer, hex, and binary. Inspect exact stored values, quantization error, rounding, and overflow locally.
REM to PX Converter — Convert Rem to Pixels
Conversion Tools
Convert rem to px instantly. 1rem = 16px at the default base, plus any custom root font-size. Free, live two-way conversion that runs 100% in your browser.
RGB to Hex Converter
Conversion Tools
Convert RGB to hex in your browser — integers, percentages, and rgba alpha all supported. Free, instant, no signup, your colors never leave the page.
Temperature Converter — Celsius, Fahrenheit, Kelvin, Rankine
Conversion Tools
Convert Celsius, Fahrenheit, Kelvin and Rankine instantly. Free online browser-based tool with conversion formulas, step-by-step guides and reference charts.
Volume & Liquid Measurement Converter — 15 Units
Conversion Tools
Convert volume & liquid capacity between 15 units — metric, US customary, imperial & cooking. Free online converter, 100% private, runs in your browser.
Weight Converter — kg, lbs, oz, g, Stone & 13 Units Total
Conversion Tools
Convert weight between 13 units instantly — metric, imperial & troy. Conversion tables, formulas & references. Free, runs in your browser.