Developer Tools FAQ
Answers to the most common questions about JSON, encoding, text tools, images, and CSS. Find what you need fast.
JSON Tools FAQ
10 questionsAnswers to the most common questions about JSON formatting, validation, minification, and conversion. Learn what JSON is, when to minify it, and how to fix common errors.
Encoding Tools FAQ
9 questionsEverything you need to know about Base64 encoding, URL encoding, JWT decoding, and HTML entities. Answers common questions about when and why to use each encoding format.
Text Tools FAQ
9 questionsCommon questions about text manipulation tools: hash generation, word counting, case conversion, and text comparison. Learn the difference between MD5 and SHA, when to use hashes, and how diff tools work.
Image Tools FAQ
9 questionsAnswers to common questions about image tools: converting images to Base64, understanding WebP format, why images should be compressed, and how QR codes work.
CSS Tools FAQ
9 questionsAnswers to common questions about CSS tools: minification benefits, color format differences, CSS validation, and optimization best practices for production websites.
Time Tools FAQ
8 questionsAnswers to common questions about Unix timestamps, epoch time, date conversion, time zones, and timestamp precision. Learn when and why developers use Unix time.
Generator Tools FAQ
8 questionsCommon questions about generating UUIDs, secure passwords, placeholder text, and random data. Learn when to use UUIDs, what makes a password strong, and how lorem ipsum generators work.
Security Tools FAQ
8 questionsSecurity-focused answers about hashing vs encryption, password storage best practices, JWT security, and how to protect sensitive data. Essential reading for developers handling authentication.
Tool-Specific FAQs
Deep-dive FAQ pages for each of our 20 free developer tools — 20+ questions per tool.
Popular Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data format used to exchange data between systems. It stores data as key-value...
See full answer in JSON Tools FAQ →How do I validate JSON online?
Paste your JSON into the JSON Formatter tool and click "Format". If the JSON is valid, it will be pretty-printed with indentation. If invalid,...
See full answer in JSON Tools FAQ →What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that converts arbitrary data into a sequence of 64 printable ASCII characters (A–Z, a–z, 0–9, +, /)....
See full answer in Encoding Tools FAQ →Is Base64 encoding the same as encryption?
No — Base64 is encoding, not encryption. Anyone can decode Base64 without a key. It's designed for data transport, not security. If you need to...
See full answer in Encoding Tools FAQ →What is a cryptographic hash?
A cryptographic hash is a fixed-length fingerprint generated from any input data. The same input always produces the same hash, but even a single...
See full answer in Text Tools FAQ →What is the difference between MD5 and SHA-256?
MD5 produces a 128-bit (32 hex characters) hash and is fast but cryptographically broken — collisions have been found. SHA-256 produces a 256-bit...
See full answer in Text Tools FAQ →How do I convert an image to Base64?
Use the Image to Base64 Converter. Drag and drop or select an image file (PNG, JPG, GIF, SVG, WebP) and the tool generates a complete...
See full answer in Image Tools FAQ →What is a Base64 data URI and when should I use it?
A Base64 data URI embeds image data directly in HTML or CSS instead of referencing an external file. Format: data:image/png;base64,[encoded-data]....
See full answer in Image Tools FAQ →Why should I minify CSS?
CSS minification removes whitespace, newlines, and comments, reducing file size by 20–40%. Smaller CSS files download faster, especially on mobile...
See full answer in CSS Tools FAQ →How do I minify CSS online?
Paste your CSS into the CSS Minifier and click Minify. The tool removes all whitespace, line breaks, and comments. Copy the result and use it in...
See full answer in CSS Tools FAQ →What is a Unix timestamp?
A Unix timestamp (also called epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC — a date...
See full answer in Time Tools FAQ →How do I convert a Unix timestamp to a human-readable date?
Paste your timestamp into the Timestamp Converter to instantly see the date and time in your local timezone and UTC. In code: JavaScript — new...
See full answer in Time Tools FAQ →What is a UUID and when should I use one?
A UUID (Universally Unique Identifier) is a 128-bit identifier written as 32 hex digits in 5 groups: 550e8400-e29b-41d4-a716-446655440000. UUIDs...
See full answer in Generator Tools FAQ →What is the difference between UUID v4 and UUID v7?
UUID v4 is completely random (122 random bits) and is the most widely used version. UUID v7 (RFC 9562, 2024) encodes a Unix timestamp in the first...
See full answer in Generator Tools FAQ →What is the difference between hashing and encryption?
Hashing is a one-way function — you cannot recover the original data from a hash. It's used for verifying integrity (file checksums) and storing...
See full answer in Security Tools FAQ →How should I store passwords in a database?
Never store passwords in plain text or with simple hashing (MD5, SHA-256). Use a dedicated password hashing algorithm: bcrypt, Argon2, or scrypt....
See full answer in Security Tools FAQ →Browse by Tool
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