LocalBench
Privacy-first developer tools that run entirely in your browser.
Guides
Plain-English explainers on JWTs, Base64, cron syntax, CIDR notation, and more — the concepts behind LocalBench's tools, not just the tools themselves.
What Is a JWT, and How Do You Read One Without a Server?
A plain-English explanation of JSON Web Tokens: what the three parts actually mean, how to decode one yourself, and why decoding a token is not the same as verifying it.
Base64 Explained: What It Is and When to Use It
What Base64 encoding actually does, why it exists, when it is the right tool and when it is not, and how to encode or decode a value yourself.
JSON vs. XML vs. CSV: Choosing a Data Format
A practical comparison of JSON, XML, and CSV — what each format is actually good at, where each one falls apart, and how to pick the right one for an API, a config file, or a data export.
Cron Syntax Cheat Sheet, With Examples
A field-by-field reference for standard cron syntax — minute, hour, day-of-month, month, day-of-week — plus ranges, steps, lists, and the @daily-style shorthands, with worked examples.
CIDR Notation Explained for Developers
What CIDR notation actually means, how the prefix length determines a network's size, and how to work out the usable host range from a block like 192.168.1.0/24.
OKLCH vs. HSL vs. HEX: A Practical 2026 CSS Color Guide
What HEX, RGB, HSL, and OKLCH each actually represent, why OKLCH is gaining ground in modern CSS, and when reaching for it is worth the switch from the color format you already know.
Unix Timestamps Explained: Seconds vs. Milliseconds
What a Unix timestamp actually counts, why some systems use seconds and others milliseconds, how to tell which one you have, and what happens in 2038.
HTTP Status Codes Explained: The Complete Guide
What each class of HTTP status code (1xx-5xx) actually means, the codes worth knowing by number, and the difference between easily confused pairs like 401 vs. 403 and 502 vs. 503.
How to Merge, Split, and Compress PDFs Without Uploading Them
Why "paste your PDF here" tools mean uploading potentially sensitive documents to a server, how client-side PDF processing avoids that entirely, and which local tool handles which task.
camelCase vs. snake_case vs. kebab-case, Across Languages
A field guide to the common identifier casing styles, the naming convention each mainstream language and context actually expects, and how to convert between them.