Everything you need. Nothing to install.

• GPU Tests WebGL GPU tests that run in the browser and report FPS and stability.
• Developer Tools Checksums, inspect jobs, and text tools that run in this browser.
• Converters Encodings, units, time zones, and letter case on this device.
• Generators Create UUIDs, passwords, random values, and wheel picks on this device.
• Calculators Interest, loans, percentages, dates, and everyday figures in the browser.

Tools, converters, generators, and calculators

• Hash MD5 Hash Generator 128-bit MD5 digest of the input bytes. Prefer SHA-256 for new integrity work; keep MD5 to match a published legacy checksum.
• Hash SHA-256 Hash Generator 256-bit SHA-256 digest of the input bytes. This is the default integrity hash on CZNull.
• Text Case Converter Rewrite letter case in the paste you provide. Unicode letters follow the en-US locale rules in this browser.
• UUID UUID Generator Create RFC 4122 / RFC 9562 UUIDs. Version 4 is random; v1 and v6 are time-based; v7 is Unix-time ordered; v3 and v5 are name-based.
• Password Password Generator Generate random passwords with unbiased Web Crypto sampling. Choose length, sets, and exclusions.
• Investment Compound Interest Calculator Future value of a lump sum that compounds on a fixed schedule. Figures stay on this device. They are not a forecast or advice.
• Math Percentage Calculator Everyday percentage jobs: of, what percent, change, increase, and decrease. Figures stay on this device.
• Date and time Age Calculator Civil calendar age in the local timezone of this device. Leave As of blank to use today.
• Loans Loan Calculator Standard amortization of a fixed-rate loan. Informational, not lending advice.
• Units Unit Converter Pick a dimension, then convert. Temperature uses offset formulas. Fuel economy uses the mpg and L/100 km relation.
• Wheels Spin the Wheel One name per line. The winner is chosen with Web Crypto, then the wheel animates to that slice. This session counts wins per name. Reset restores the list and clears those scores.
• Wheels Yes or No Wheel Two slices, one spin. Yes is green, No is red. The answer is chosen with Web Crypto before the wheel moves. Session counts show how many times Yes and No came up. Reset clears those scores.

GPU tests

• Shaders and volumetrics Volume shader BM test Timed official volume shader BM: Mandelbulb kernel and ray marcher. Pick Simple, Standard, Advanced, or Extreme, then read FPS, frame time, and stability.
• Shaders and volumetrics Volume shader test The official CZNull volume shader, interactive: same Mandelbulb kernel and ray marcher as the BM test, without a timer or auto-spin. Drag to orbit, pick a complexity level, and watch FPS.
• Stress GPU stress test Keep the fragment shader busy for a timed window. Raise complexity and iterations, then watch FPS and stability as the GPU warms.

Why people open CZNull

• Tools

  Checksums, JSON, Unix time, and word counts for jobs you already have.

• Converters

  Encodings, units, time zones, and letter case. Reversible encodings are not encryption.

• Generators

  New values on this device: identifiers, passwords, random numbers, and a spin wheel.

• Calculators

  Figures for money, math, dates, and health. Output is informational, not advice.

• Tests

  WebGL scenes that load the graphics chip and report FPS on this device.

Common questions