23.02.2026
4 min
1
365
In the second part of the review, we take a closer look at another set of free online tools designed for working with numbers, data formats, encoding, and text transformations. This collection includes web utilities that allow you to quickly convert number systems, handle Base64, change text case, translate data into Unicode or ASCII, and convert between YAML, JSON, and TOML formats — all without unnecessary configuration.
The same idea, but for files. You can convert a file or an image to Base64 and back again. It’s especially useful when you need to embed a file directly into code or send it via an API without handling a separate upload.
Converts Roman numerals into regular numbers and vice versa. It may seem like a niche tool, but it does come in handy from time to time — especially when dealing with documents or older numbering systems.
Encodes and decodes strings in Base64. It’s commonly used in APIs, tokens, and configuration files. When you come across a strange string of characters and suspect it’s Base64, you just paste it in, decode it, and immediately see what’s inside.
Lets you quickly convert a number from one numeral system to another — decimal, binary, hexadecimal, and more. It’s especially handy when working with logs, bits, or network data and you need to figure out what a particular sequence of digits actually represents.
Converts colors between different formats — HEX, RGB, HSL, and others. If you work with frontend development or design, this kind of tool is something you’ll need all the time. It lets you quickly check how the same color is represented across different formats.
Changes text case — uppercase, lowercase, snake_case, camelCase, and other variations. It may seem like a small thing, but when you’re working with code or a large block of text, it saves a lot of time. No need to rewrite everything manually or look for extra plugins.
Converts text into the NATO phonetic alphabet — Alpha, Bravo, Charlie, and so on. Useful for transmitting information verbally or simply to see how it’s structured in phonetic form.
Converts text into binary ASCII code and back. A great tool for learning or for quickly checking encoding. It lets you clearly see how regular characters are represented at the bit level.
Converts YAML to TOML. It’s useful when working with different configuration formats and you need to quickly switch the structure. Especially helpful in DevOps scenarios.
Converts YAML to JSON in just a few clicks. If you’re working with configuration files or Kubernetes, it’s basically a must-have. No need to manually restructure anything — it’s all handled automatically.
Converts text to its Unicode representation and back. It’s useful when dealing with special characters or emojis and you need to identify their code points. It often comes in handy when working with JSON or web requests.
Performs the reverse operation — JSON to YAML. It’s often used when you want to make a configuration more readable. Helps you quickly switch formats without running into indentation errors.
