Unix Timestamp Seconds vs Milliseconds
Learn how to identify 10-digit Unix seconds, 13-digit Unix milliseconds, UTC ISO output, and common timestamp conversion mistakes.
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AppHelp guides
Guides for utility workflows and format decisions
Short English guides that explain AppHelp utility workflows, common format mistakes, safe encoding choices, and which browser-local tool to use.
Quick answer
Use AppHelp guides when you need the rule behind a conversion, not only the conversion itself. Each guide explains the practical decision and then points to browser-local tools that handle the task.
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These pages are written as stable answers for search engines, AI answer systems, and people comparing tool behavior.
JSON Escape vs JSON.stringify
Understand the difference between escaping JSON string content, formatting a JSON document, and using JSON.stringify in JavaScript.
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Base64 Is Encoding, Not Encryption
Learn what Base64 does, when to use it, why it does not protect secrets, and how to decode Base64 safely for debugging.
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URL Encoding vs Percent Encoding
Understand reserved URL characters, percent-encoded bytes, plus signs, query strings, and common double-encoding mistakes.
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Image Compression: WebP vs JPEG vs PNG
Choose WebP, JPEG, or PNG output for web images, screenshots, transparency, and file-size savings.
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Line Sorter: Alphabetize, Deduplicate, and Sort Text
Learn how to sort lines alphabetically, numerically, or naturally, remove duplicates safely, and prepare clean lists for spreadsheets, docs, and code review.
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Hex Encoding for Text, Bytes, and Debugging
Understand when hexadecimal encoding is useful, how UTF-8 text becomes byte pairs, and what to check before decoding hex strings.
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JSON Formatter vs Validator for API Debugging
Learn when to pretty-print JSON, when to validate syntax, and how to debug API payloads without changing the data.
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HEX, RGB, and HSL Color Conversion
Learn how HEX, RGB, and HSL describe the same color, when designers and developers use each format, and how to avoid alpha and shorthand mistakes.
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Merge and Split PDF Files in Browser-Local Workflows
Learn when to merge PDFs, when to split page ranges, and how to keep page order, file size, and privacy in mind.
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Text Case Conversion for Titles, Slugs, and Cleanup
Learn when to use title case, sentence case, uppercase, lowercase, camelCase, kebab-case, and slug-style text cleanup.
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Markdown TOC and Documentation Cleanup Workflows
Learn how to generate Markdown tables of contents, prepare heading structure, and connect Markdown output to HTML, README, and document workflows.
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CSV to Markdown Table Cleanup
Learn how to prepare CSV rows for Markdown tables, avoid delimiter mistakes, and choose between CSV, JSON, and Markdown table formats.
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Regex Tester Workflow for Pattern Debugging
Learn how to test regular expressions against sample text, debug anchors and groups, and avoid over-matching during cleanup tasks.
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QR Code and Barcode Content Sharing
Learn when to use QR codes, when to use barcodes, and how to prepare links, labels, and print assets for reliable scanning.
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Unicode Escape and HTML Entity Encoding
Learn when to use Unicode escapes, HTML entities, and width conversion for text that must survive code, HTML, JSON, and documentation contexts.
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SQL Formatter vs SQL Minifier Workflows
Learn when to format SQL for review, when to minify SQL for transport, and how to keep query meaning stable while changing whitespace.
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JSON, YAML, XML, Schema, and Diff Conversion
Learn how to choose between JSON, YAML, XML, JSON Schema, and JSON diff tools when moving structured data between systems.
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Image Crop, Resize, Rotate, Convert, and Data URL Workflows
Learn how to prepare web images with crop, resize, rotation, format conversion, and Data URL output without uploading files by default.
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API Request Conversion, Headers, and Client Debugging
Learn how to convert cURL commands into client snippets, inspect headers, format GraphQL, and read user-agent strings during API debugging.
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UUIDs, Passwords, and Random Identifier Workflows
Learn when to generate UUIDs, when to generate passwords, and why identifiers, random tokens, hashes, and secrets solve different problems.
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CSS Gradients, Clamp Sizes, and SVG Asset Cleanup
Learn how to prepare gradients, clamp-based responsive values, SVG optimization, and SVG-to-PNG exports for front-end UI work.
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JSONPath and XML Inspection Workflows
Learn how to inspect nested JSON with JSONPath, format XML for review, and convert XML to JSON only after understanding the source structure.
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PDF Page Rotation, Deletion, Watermarks, and Page Numbers
Learn how to finish PDF page sets with rotation, deletion, page numbering, watermarking, and image-to-PDF conversion.
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Subtitle and Caption Timing Workflows
Learn how to convert SRT to VTT, shift subtitle timing, merge bilingual captions, and count caption text before publishing.
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DOCX, Markdown, Resume, and Document Export Workflows
Learn how to move between DOCX and Markdown, prepare resume content, and choose the right export path for docs, websites, and applications.
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Social Images, Favicons, Watermarks, and Sharing Assets
Learn how to prepare social preview images, favicons, watermarked assets, Markdown images, and 9-grid image splits for publishing workflows.
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Developer toolsAppHelp developer tools run in the browser for fast JSON, API, encoding, hashing, JWT, cURL, GraphQL, SQL, XML, YAML, and request-inspection workflows without uploading input by default.Data toolsAppHelp data tools help convert between common operational formats such as timestamps, query strings, JSON, CSV, Markdown tables, PDFs, and text-friendly encodings without requiring accounts or uploads by default.Writing toolsAppHelp writing tools support Markdown, README, changelog, meeting note, subtitle, text sorting, word counting, case conversion, and copy cleanup workflows directly in the browser.Image toolsAppHelp image tools cover compression, resizing, cropping, conversion, metadata removal, SVG export, QR codes, color conversion, social images, favicons, and PDF page workflows with local processing by default.