About CZNull
CZNull is a catalog of single-purpose pages. You open a URL, do one job, and leave with a result: a checksum, an encoding, a UUID, a password, a figure, or a GPU reading.
What you came to do
People land here with a concrete task: match a published MD5, encode a string as Base64, tidy JSON, change letter case, mint a UUID of a specific version, generate a password with known rules, project compound interest, or see how a GPU behaves under a WebGL scene.
Each page is built around that task. Settings sit next to the work so you can match the encoding, format, UUID version, compounding schedule, or test preset you actually need.
How to use a page
Open the page for the job. Paste or type input, or set generator and test options. Read the result on the same screen. Copy or download when you need the value elsewhere.
Search in the header if you already know the name (MD5, UUID, volume shader). Use Tools, Converters, Generators, Calculators, or Tests if you are browsing. Category pages such as hash tools or encoding converters list every page in that group.
Which section to open
Tools transform something you already have: checksums, JSON format or minify, Unix time, and word counts.
Converters change representation: Base64, URL encoding, HTML entities, units, time zones, and letter case. Encoding is reversible. It is not encryption.
Generators create new values: UUID versions, passwords, random integers, list picks, and a spin wheel. A UUID is an identifier. A password is a secret.
Calculators apply a formula to numbers you type: interest, loans, percentages, age, BMI, and similar figures. They are informational, not tax, lending, medical, or investment advice.
Tests load the graphics chip in this browser and report FPS, frame time, and related readings. They are not a game benchmark you submit anywhere, and they are not a hardware certification.
What stays on this device
Hash, JSON, converter, UUID, password, and calculator pages run in the tab you opened. CZNull does not receive the text you paste or the values you generate. GPU tests draw in that same tab. We do not receive the frames.
You still requested a web page, so the usual visit information that any site may see can exist. That is separate from tool input. Details are on the privacy policy.
Using GPU tests
A test page tells you what the scene is exercising: shader load, particles, texture pressure, or a timed overload. That way an FPS number has a cause. Start on a lighter preset on a phone. Plug into power when you can. Stop the run if the device is uncomfortably hot or the fans stay loud after you leave the page.
Scores move with drivers, background tabs, battery modes, and display scaling. Compare runs only when those conditions are similar. Nothing on a test page certifies a purchase or an overclock.
Reading a result
A hash is only useful if the input bytes and output format match the checksum you are comparing. If your digest disagrees with another page, check encoding (UTF-8 vs hex), HMAC, and whether you hashed a file's bytes or the characters of a hex dump.
Base64 and URL encoding are reversible. They are not encryption. JSON format and minify need a successful parse (repair is optional on those pages). UUID versions are not interchangeable: v4 is random, v3 and v5 are name-based, and v1, v6, and v7 encode time.
What CZNull is not
There is no account, no install, and no app store package. We do not store your pastes, generated secrets, or GPU traces as a login history.
Pages are helpers, not professional advice. A checksum is not a security audit. A password from the generator is only as strong as the options you chose and where you store it. Calculator output is not tax, lending, or investment advice. GPU figures are not a warranty.
Limits of the information we publish are on the disclaimer. How you may use the site is on the terms of use.