Docify guides

Base64 vs Base64URL: URL-Safe Alphabet

Thu, 01 Oct 2026 00:00:00 GMT

Standard Base64 uses + and /, which break URLs. Base64URL replaces them with - and _, making encoded strings safe for query parameters and filenames.

JSON vs YAML: Configuration Files

Thu, 01 Oct 2026 00:00:00 GMT

Compare JSON and YAML syntax for configuration files. JSON uses braces and quotes; YAML uses indentation and allows comments. Learn when to use each format.

Hex vs Base64 vs Base32: RFC 4648 Encodings

Thu, 01 Oct 2026 00:00:00 GMT

Hex expands bytes 100%, Base64 expands 33%, Base32 expands 60%. Compare encoding density, character sets, and use cases.

WHATWG new URL vs encodeURI: Punycode vs Percent-Encoding

Thu, 01 Oct 2026 00:00:00 GMT

WHATWG URL parses and normalizes URLs including Punycode for international domains. encodeURI percent-encodes without parsing structure. Learn when to use each.

Punycode vs IDNA: RFC 3492 and UTS #46

Thu, 01 Oct 2026 00:00:00 GMT

Compare RFC 3492 Punycode (label encoding) vs UTS #46 IDNA (full domain ToASCII). Learn when each applies to internationalized domains.

URLSearchParams vs encodeURIComponent: Form vs Percent-Encoding

Thu, 01 Oct 2026 00:00:00 GMT

URLSearchParams uses + for spaces (form encoding). encodeURIComponent uses %20 (RFC 3986). Choose based on whether you need HTML form compatibility.

RFC 4648 Base32 vs Base32hex: Alphabet and Sort Order

Thu, 01 Oct 2026 00:00:00 GMT

Base32 uses A-Z and 2-7. Base32hex uses 0-9 and A-V for natural sort order. Both are RFC 4648 compliant with different alphabets.

NFC vs NFD vs NFKC: Canonical vs Compatibility

Tue, 29 Sep 2026 00:00:00 GMT

NFC composes characters (é). NFD decomposes them (e + combining acute). NFKC and NFKD also normalize compatibility characters. Learn which form to use.

Convert JSON to CSV in JavaScript: Papa.unparse vs Papa.parse

Sat, 26 Sep 2026 00:00:00 GMT

Raw Papa.unparse writes [object Object] for nested values. IEEE-754 rounding happens at JSON.parse. This article compares them and does not convert JSON.

How to Convert JPG & PNG Images to PDF (Combine Multiple Images into One PDF)

Thu, 08 Oct 2026 00:00:00 GMT

jsPDF addImage always passes JPEG, even for PNG sources. Each image gets one A4 portrait page. This article explains jsPDF image-to-PDF and does not convert images.

How to Sign a PDF Online Free

Thu, 24 Sep 2026 00:00:00 GMT

pdf-lib embedPng and drawImage stamp a PNG on page 1 at x:50, y:50 (150×50 pt). This is not PKCS#7. This article explains pdf-lib stamping and does not sign PDFs.

Convert Markdown to HTML: marked + DOMPurify

Tue, 29 Sep 2026 00:00:00 GMT

marked does not sanitize HTML. DOMPurify strips scripts after parse. This article explains marked plus DOMPurify and does not convert Markdown.

Encode Text to Base64: btoa + UTF-8

Mon, 28 Sep 2026 00:00:00 GMT

Encode text to Base64 using btoa() with UTF-8 encoding. Handles Unicode characters correctly by converting to UTF-8 first.

Markdown to PDF Converter: jsPDF Plain-Text Export

Tue, 29 Sep 2026 00:00:00 GMT

jsPDF splitTextToSize draws stripped Markdown lines at 12pt (width 170, 7 units per wrap). marked HTML is never passed to jsPDF. This article explains the jsPDF text dump and does not export PDFs.

YAML 1.2 Core vs 1.1: Norway, Comments, JSON

Wed, 23 Sep 2026 00:00:00 GMT

YAML 1.2 Core schema treats yes/no as strings, not booleans. JSON is valid YAML 1.2. Learn the key differences from YAML 1.1.

Calculate Blog Reading Time: Words Per Minute

Mon, 28 Sep 2026 00:00:00 GMT

Calculate reading time at 200 words per minute using whitespace-split word counts. Useful for blog post metadata.

Convert a File to Base64: FileReader

Mon, 28 Sep 2026 00:00:00 GMT

Convert files to Base64 using FileReader. The file never leaves your browser. Useful for embedding images in data URLs.

Convert Text to UPPERCASE in the Browser

Mon, 28 Sep 2026 00:00:00 GMT

Convert text to UPPERCASE using JavaScript toUpperCase(). Spaces and punctuation are preserved. Also supports lowercase, Title Case, and snake_case.

CSV to JSON in the Browser with Papa Parse

Sat, 26 Sep 2026 00:00:00 GMT

Quoted numeric cells become numbers under dynamicTyping. CSV quotes only escape delimiters. This article explains Papa Parse and does not convert CSV.

Decode Base64 to UTF-8: atob

Mon, 28 Sep 2026 00:00:00 GMT

Decode Base64 strings to UTF-8 text using atob(). Handles Unicode when the original was properly UTF-8 encoded.

JavaScript RegExp vs PCRE: Flags and Lookbehind

Tue, 29 Sep 2026 00:00:00 GMT

JavaScript RegExp differs from PCRE. The u flag enables Unicode mode. Lookbehind was added in ES2018. Some PCRE syntax is unsupported.

Named vs Numeric HTML Entities: Names vs Code Points

Mon, 28 Sep 2026 00:00:00 GMT

HTML entities encode special characters: < for <, & for &. Named entities are readable; numeric work everywhere.

snake_case Converter: Python Variables and Database Columns

Mon, 21 Sep 2026 00:00:00 GMT

Convert text to snake_case: lowercase with underscores replacing spaces. Useful for variable names in Python and database columns.

UUID Versions Explained: v4 vs v1, v5, v7 and v8 (Format & Length)

Fri, 09 Oct 2026 00:00:00 GMT

Compare UUID versions: v4 random, v1/v7 time-based, v5 name-hashed, v8 custom. All UUIDs are 128 bits (36 chars with hyphens, 32 without).

Compact JWS vs JWE: Decode Is Not Verify

Tue, 29 Sep 2026 00:00:00 GMT

Compact JWS is three base64url segments; compact JWE is five. This article compares them and does not decode tokens.

Compare Two Texts with diff-match-patch

Tue, 29 Sep 2026 00:00:00 GMT

diff_main then diff_cleanupSemantic paints delete, insert, and equal spans. Replacements are delete-plus-insert. This article explains the character-level diff and does not compare texts.

How to Format JSON Online: Parse and Prettify

Tue, 29 Sep 2026 00:00:00 GMT

Format JSON with proper indentation for readability, or minify to remove whitespace. Validates syntax and shows error messages.

Letraset Dummy vs Cicero: Not Random Latin

Sun, 20 Sep 2026 00:00:00 GMT

Lorem ipsum comes from a scrambled passage of Cicero. The Letraset version has specific sentence patterns. Not random Latin.

Minify JSON Without Breaking Unicode

Tue, 29 Sep 2026 00:00:00 GMT

Minify JSON while preserving Unicode characters. Unlike some tools, special characters remain readable instead of being escaped.

Positional BigInt vs Number.parseInt

Sun, 27 Sep 2026 00:00:00 GMT

Number.parseInt stops at the first invalid digit. Exact integers end at 2^53-1. This article compares it with Horner's method on BigInt and does not convert numbers.

SHA-256 vs SHA-1 vs MD5: Differences and Which to Use

Mon, 28 Sep 2026 00:00:00 GMT

SHA-256 is the standard for checksums. SHA-1 and MD5 are deprecated for security. None are suitable for password hashing.

sRGB Hex vs rgb() vs hsl(): Same Triple, Three Spellings

Wed, 30 Sep 2026 00:00:00 GMT

Compare sRGB hex, rgb(), and hsl() notations. Same opaque color, three CSS spellings. Use the browser converter — nothing is uploaded.

Unix Seconds vs Milliseconds: UTC vs Local

Tue, 29 Sep 2026 00:00:00 GMT

POSIX seconds and JavaScript Date milliseconds are two integer clocks. Digit length is not a unit.

UTF-16 vs Locale Sort: Code Units vs localeCompare

Mon, 28 Sep 2026 00:00:00 GMT

JavaScript sort uses UTF-16 code units by default, so 10 sorts before 2. Use localeCompare for natural sorting.

Validate JSON Syntax with JSON.parse

Tue, 29 Sep 2026 00:00:00 GMT

Validate JSON syntax using JSON.parse(). Invalid JSON shows the error message and position. Valid JSON can be formatted or minified.

Vixie Crontab vs Quartz: 5-Field vs 6/7

Sun, 20 Sep 2026 00:00:00 GMT

Vixie crontab is five fields (minute through day-of-week). Quartz adds seconds and an optional year. This article compares them and does not parse expressions.

How to Count Words Online: Whitespace Split

Mon, 28 Sep 2026 00:00:00 GMT

Count words by splitting on whitespace. Unspaced CJK text counts as one word since the split is whitespace-only. Character count includes spaces.