Guides
How to use each tool, with tips and best practices
How to Format and Validate JSON
Pretty-print, minify, and validate JSON with instant syntax error highlighting.
How to Convert JSON to CSV and CSV to JSON
Convert between JSON and CSV formats — handles nested objects, arrays, and RFC 4180.
How to Join and Compare Two CSV Files
Learn how to match two CSVs by key column and find matches, differences, and missing rows.
How to Convert JSON to YAML and YAML to JSON
Convert between JSON and YAML for DevOps, configuration, and API workflows.
How to Find a JSON Path
Navigate JSON structures and copy paths in dot or bracket notation for API debugging.
How to Count Words and Characters Online
Count words, characters, and paragraphs. Check reading time and social media character limits.
How to Convert Text Case
Convert between UPPERCASE, camelCase, snake_case, kebab-case, and 5 more formats.
How to Compare Two Texts and Find Differences
Compare texts side by side and see additions, deletions, and changes highlighted.
How to Clean Up Transcripts and Remove Filler Words
Learn how to automatically remove um, uh, you know, and other fillers from meeting transcripts.
How to Check Text Style Consistency
Learn how to detect fullwidth characters, fullwidth spaces, and halfwidth katakana in CJK content.
How to Generate Lorem Ipsum Placeholder Text
Generate Lorem Ipsum by paragraphs, sentences, or words with optional HTML tags.
How to Preview Markdown Online
Preview Markdown with GFM support and export as a self-contained HTML file.
How to Encode and Decode Base64
Learn how to encode text to Base64, decode Base64 strings, and convert images to data URIs.
How to Encode and Decode URLs
URL-encode text for query parameters and decode percent-encoded strings back to readable text.
How to Generate MD5, SHA-256, and Other Hashes
Generate cryptographic hashes from text in real time. Understand when to use each algorithm.
How to Decode and Inspect JWT Tokens
Decode JWTs to view header, payload, claims, and expiration status.
How to Encode HTML Entities
Convert special characters to HTML entities — named, numeric, and hex formats with examples.
How to Generate a QR Code
Create custom QR codes from text or URLs. Adjust size and colors, download as PNG or SVG.
How to Generate a Strong Password
Create cryptographically secure passwords with customizable length, character types, and strength meter.
How to Generate UUIDs (v4 and v7)
Generate UUID v4 (random) and v7 (time-sortable). Understand when to use each version.
How to Batch Resize Images for Free
Learn how to resize, convert, and rename multiple images at once — then download as a zip.
How to Compress Images Without Losing Quality
Reduce image file size by 60-80% while keeping visual quality. Covers JPEG, PNG, and WebP.
How to Convert Colors Between HEX, RGB, and HSL
Convert colors between formats, pick visually, and copy CSS-ready values.
How to Convert SVG to PNG
Convert SVG vector images to PNG with custom sizes, backgrounds, and preset icon dimensions.
How to Generate Favicons for Your Website
Create multi-size favicons from a single image — ICO, PNG, Apple Touch Icon, and Android Chrome.
How to Extract Web Tables to CSV
Learn how to convert HTML tables to CSV with one click — no more broken formatting from copy-paste.
How to Check Heading Structure
Learn how to audit H1–H6 hierarchy for SEO and accessibility issues.
How to Create a robots.txt File
Control search engine crawling with user-agent rules, allow/disallow paths, and sitemaps.
How to Create Open Graph Meta Tags
Generate OG and Twitter Card meta tags with live previews for Facebook and Twitter.
How to Test Regular Expressions
Test regex with real-time matching, capture groups, and replace preview.
How to Convert Unix Timestamps
Convert between Unix epoch timestamps and human-readable dates with timezone support.
How to Parse Cron Expressions
Understand cron syntax, common scheduling patterns, and how to preview execution times.