Why a character count and a byte limit disagree
Compare Unicode code points, visible characters, JavaScript length, and UTF-8 bytes with Korean text, emoji, and combining accents.
Read the worked example →Text, color, and image tools.
Choose a tool and enter your values. These calculations run in your browser; your inputs are not saved or uploaded.
Text and byte counter
Paste text to compare Unicode characters, UTF-16 units, and UTF-8 bytes. Spaces and line breaks are included.
HEX color converter
Convert a HEX color to RGB and HSL, and check the color change caused by rounding HSL to whole numbers.
Image fit and crop calculator
Enter pixel dimensions to compare a centered crop with fitting the whole image. This calculates geometry, not an image file.
Understand your results.
Worked examples, edge cases, and the limits of each calculation.
Resize a photo without confusing crop, dimensions, and file size
Work through a 4032 × 3024 photo exported at 1200 × 630, choose Fill or Fit, and preserve transparency with the right format.
Read the worked example →Convert HEX, RGB, and HSL without losing track of rounding
Decode #D9FF68, reproduce its RGB and HSL values, and understand why an integer HSL round trip can change the final HEX.
Read the worked example →More tools and services.
HaloBench and PicFit work without an account. Try myOS with fictional schedules before signing in to your private workspace.
HaloBench
A searchable collection of focused tools for text, dates, calculations, images, color, and developer work.
- 33 working utilities
- Tool-specific guidance in eight languages
- Search tools; save favorites in this browser
PicFit
Turn one source image into the sizes required by creator platforms and app stores, then download the selected outputs together.
- Preset and custom dimensions
- Crop focus, quality, and format controls
- Image processing in the browser
myOS
Connect schedules, projects, study, finance, notes, ideas, and frequently used accounts in one personal workspace.
- Try recurring schedules without an account
- Encrypted workspace synchronization
- Optional user-configured AI providers