Frequently Asked Questions

Yes, all OneDevKit tools are 100% free to use with no hidden costs, subscriptions, or premium tiers. We believe essential developer utilities should be accessible to everyone.

Absolutely. All our tools run entirely in your browser using JavaScript. Your data never leaves your device and is never sent to any server.

No. Simply visit the tool you need and start using it immediately. We believe in frictionless access to developer utilities.

JSON formatting (also called beautifying) adds proper indentation and line breaks to make JSON human-readable.

Formatting adds whitespace for readability. Minifying removes all unnecessary whitespace to reduce file size.

Yes. All processing happens in your browser. Your data never leaves your device.

This formatter works with standard SQL syntax used by MySQL, PostgreSQL, SQL Server, SQLite, and Oracle. It handles common keywords and clauses across all dialects.

Minify removes all unnecessary whitespace and newlines, condensing your SQL into a single line. Useful for embedding in code or reducing query size.

Yes. All formatting happens in your browser. Your SQL queries never leave your device.

XML formatting adds proper indentation and line breaks to make XML human-readable. It organizes nested elements visually while preserving the document structure.

When enabled, empty elements like <tag></tag> are converted to self-closing form: <tag/>. This makes the output more concise.

Yes. All processing happens in your browser. Your XML data never leaves your device.

The Format button beautifies your Markdown by: standardizing list markers to dashes, fixing ordered list numbering, normalizing horizontal rules, ensuring consistent spacing around headers and code blocks, converting underscores to asterisks for emphasis, and removing extra blank lines.

This tool supports GitHub Flavored Markdown (GFM) including: headers, bold, italic, strikethrough, links, images, code blocks, blockquotes, lists, tables, task lists, and horizontal rules.

Yes! Click "Copy Markdown" to copy the formatted source, or "Copy HTML" to get the rendered HTML for your website or application.

Content is not automatically saved. Copy your Markdown or HTML before leaving the page if you want to keep it.

Base64 is a binary-to-text encoding scheme that converts binary data into ASCII text. It's commonly used for embedding images in HTML/CSS, email attachments, and data transmission.

No. Base64 is encoding, not encryption. Anyone can decode it. Never use Base64 to protect sensitive data.

Yes. All processing happens in your browser. Your data never leaves your device.

URL encoding (percent encoding) replaces special characters with a % followed by their hexadecimal value. For example, a space becomes %20. This ensures URLs are valid and can be transmitted safely.

Component mode (encodeURIComponent) encodes everything except A-Z, a-z, 0-9, and - _ . ~. Use this for query parameter values.Full URL mode (encodeURI) also preserves : / ? # [ ] @ ! $ & ' ( ) * + , ; = for valid URL structure.

Yes. All encoding/decoding happens in your browser. Your data never leaves your device.

JSON Web Token (JWT) is a compact, URL-safe way to represent claims between two parties. It consists of three parts: Header, Payload, and Signature, separated by dots.

iss (issuer), sub (subject), aud (audience), exp (expiration time), iat (issued at), nbf (not before). You can also add custom claims.

This tool decodes and displays the JWT but does not verify the signature. Signature verification requires the secret key, which should never be shared publicly.

Yes. All decoding happens in your browser. Your token never leaves your device.

This tool works best with JSON arrays of objects, where each object has the same structure. Single objects are also supported and converted to a single row.

Nested objects are automatically flattened using dot notation (e.g., "address.city"). Arrays within objects are joined with semicolons.

The tool automatically detects whether your CSV uses commas, semicolons, tabs, or pipes as delimiters by analyzing the first few lines.

Yes. All conversion happens in your browser. Your data never leaves your device.

YAML is more human-readable with indentation-based structure, while JSON uses braces and brackets. YAML supports comments; JSON doesn't. Both are commonly used for configuration files and data exchange.

No. YAML comments are not preserved when converting to JSON since JSON doesn't support comments. Converting back to YAML will not restore them.

Yes. All conversion happens in your browser. Your data never leaves your device.

This converter supports headings, paragraphs, bold, italic, strikethrough, links, images, lists (ordered and unordered), code blocks, blockquotes, tables, and horizontal rules.

HTML comments are not converted to Markdown as Markdown doesn't have a standard comment syntax. They will be removed during conversion.

Script and style tags are ignored during HTML to Markdown conversion for security and cleanliness.

Yes. All conversion happens in your browser. Your data never leaves your device.

Our generator uses the browser's cryptographic API (crypto.getRandomValues) for true randomness. Passwords are generated locally and never sent to any server.

A strong password is at least 12-16 characters long with a mix of uppercase, lowercase, numbers, and symbols. Avoid personal information and common words.

Yes. All processing happens in your browser. Your passwords never leave your device.

A UUID is a 128-bit identifier guaranteed to be unique across all systems. It's commonly used for database primary keys, session IDs, and API references.

UUID and GUID are the same thing. UUID is the standard term, while GUID is Microsoft's terminology. Both follow the same format.

Nil UUID is all zeros (00000000-0000-0000-0000-000000000000) and represents an empty or null UUID. Max UUID is all ones (ffffffff-ffff-ffff-ffff-ffffffffffff) and is useful for range queries as the maximum possible value.

Theoretically possible, but the probability is astronomically low (about 1 in 2^122). For practical purposes, collisions are considered impossible.

A hash function takes input data and produces a fixed-size string of characters (the hash). The same input always produces the same hash, but it's computationally infeasible to reverse the process or find two inputs with the same hash.

SHA-256 or SHA-3 are recommended for most security use cases. Here's a quick guide:

This tool supports 8 hash algorithms:

No. Hashing is one-way - you cannot recover the original data from a hash. Encryption is two-way - you can decrypt encrypted data with the right key.

Yes. All hashing happens in your browser. Your data never leaves your device.

Lorem Ipsum is placeholder text used in design since the 1500s when a printer scrambled classical Latin literature to create a type specimen book.

It has a natural letter distribution that mimics real text without being distracting, so reviewers focus on design rather than content.

It's derived from Latin but intentionally scrambled. It resembles Latin but has no actual meaning.

URLs, plain text, phone numbers, email addresses, WiFi credentials, geographic coordinates, calendar events, and contact information (vCards).

Error correction allows QR codes to be read even if partially damaged. Level L (7%), M (15%), Q (25%), H (30%). Higher levels mean larger but more resilient codes. When adding a center logo, High (H) level is recommended as the logo covers part of the code.

No. QR codes are generated entirely in your browser. No data is sent to any server.

A cron expression is a string of 5 fields (minute, hour, day of month, month, day of week) that defines a schedule for automated tasks. It's used in Unix/Linux crontab, CI/CD pipelines, cloud schedulers, and many scheduling systems.

Standard cron uses 5 fields: minute (0-59), hour (0-23), day of month (1-31), month (1-12), day of week (0-6). Some systems like Quartz and Spring add a 6th field for seconds at the beginning. This tool generates standard 5-field expressions.

The asterisk means 'every' or 'any value'. For example, * in the hour field means every hour, and * * * * * means every minute of every hour of every day.

Use 1-5 or MON-FRI in the day of week field (5th field). For example, '0 9 * * 1-5' runs at 9 AM Monday through Friday.

Yes. All processing happens in your browser. Your cron expressions never leave your device.

Reading time is calculated based on an average reading speed of 200 words per minute, which is typical for adult readers.

Speaking time uses an average of 150 words per minute, which is a comfortable speaking pace for presentations.

No. All processing happens in your browser. Your text never leaves your device.

A word is any sequence of characters separated by spaces or line breaks. Numbers and hyphenated words count as single words.

Case conversion changes the capitalization of text. For example, converting "Hello World" to "HELLO WORLD" is an uppercase conversion.

camelCase is commonly used in JavaScript and Java. snake_case is preferred in Python and Ruby. kebab-case is used for URLs and CSS class names.

No. All conversion happens in your browser. Your text never leaves your device.

This tool uses JavaScript's native RegExp engine. It supports standard regex syntax including character classes, quantifiers, groups, lookahead/lookbehind, and Unicode properties.

g (global): Find all matches. i: Case-insensitive. m (multiline): ^ and $ match line boundaries. s (dotAll): . matches newlines. u (unicode): Enable Unicode features.

Use parentheses to create groups: (pattern). Named groups use (?<name>pattern). Groups are shown in the match details section.

Yes. All regex processing happens in your browser. Your patterns and test strings never leave your device.

This tool uses a line-by-line diff algorithm similar to the Unix diff command. It identifies additions, deletions, and unchanged lines between the two texts.

Green indicates lines added in the modified text. Red indicates lines deleted from the original. White/unchanged lines appear in both texts.

Unified shows all changes in a single column with +/- prefixes. Side by side shows original and modified texts in parallel columns for easier comparison.

The tool works best with texts up to 10,000 lines. Larger texts may be slower to process. All processing happens in your browser.

We use smart compression that adjusts quality and dimensions to hit your target file size. The algorithm uses binary search to find the optimal quality setting.

No! All compression happens in your browser using JavaScript. Your images never leave your device, ensuring complete privacy.

For very small targets, we may need to reduce image dimensions. The tool will find the best balance between size and quality.

JPG, PNG, and WebP. Output is always JPG for best compression results.

Yes! This passport photo maker is completely free. No signup, no watermarks, no hidden fees.

No. All processing happens in your browser. Your photos never leave your device.

This tool helps with sizing and compression. For official acceptance, ensure your original photo meets all requirements (lighting, expression, background, etc.).

Using the correct dimensions ensures your images display properly without cropping or quality loss. Each platform has optimal sizes for different content types.

JPG is best for photos (smaller file size). PNG is better for graphics with text or transparency (higher quality but larger files).

No. All processing happens in your browser. Your images never leave your device.

This tool accepts images up to 20MB. Most social platforms have their own limits (usually 5-10MB for uploads).

HEX uses hexadecimal values (e.g., #FF5733). RGB defines colors by Red, Green, Blue values (0-255). HSL uses Hue (0-360), Saturation (0-100%), and Lightness (0-100%).

HEX is compact and widely used in CSS. RGB is intuitive for mixing colors. HSL is best for creating variations (adjusting lightness/saturation while keeping the hue).

Shades are darker variations (adding black). Tints are lighter variations (adding white). These help create consistent color hierarchies in your designs.

Complementary colors are opposite on the color wheel (180 degrees apart in hue). They create strong contrast and visual interest when used together.

A Unix timestamp (or Epoch time) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC. It's a standard way to represent time in computing.

Unix timestamps are timezone-independent, easy to store (just a number), and simple to compare. They're widely used in databases, APIs, and programming.

Standard Unix timestamps are in seconds. JavaScript and some APIs use milliseconds (1000x larger). This tool provides both formats.

DST (Daylight Saving Time) is when clocks are adjusted forward/backward seasonally. This tool automatically accounts for DST rules in each timezone.

UTC (Coordinated Universal Time) and GMT (Greenwich Mean Time) are essentially the same for practical purposes. UTC is the modern standard used in computing.

Yes. All conversions happen in your browser. No data is sent to any server.