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XLToolLab

Tutorial Center

Browse practical guides by tool category to quickly find the right workflow for image, document, table, text, and developer tasks.

This page focuses on real workflows instead of generic marketing copy. Each category gives you direct entry points into the right tool, plus a reserved article path for deeper how-to content.

Image Tools

Practical guides for compression, resizing, cropping, format conversion, and simple image editing.

How to resize an image without distortion

Lock the aspect ratio first, then adjust width and height gradually so the image stays proportional.

How to compress images while keeping them clear

Start from medium or high quality, preview edges and text carefully, then lower the size step by step.

How to choose between PNG, JPG, and WebP

Pick the output format based on transparency, file size, compatibility, and how the image will be used.

Unit Conversion

Useful for study, office work, print sizing, and checking values across different measurement systems.

How to convert centimeters and inches

Open the length converter and enter a value on either side to see the common length units instantly.

How to calculate A4 size in pixels

Combine paper size and DPI values to estimate pixel dimensions for export and printing.

How to convert KB, MB, and GB quickly

Use the data storage tool to compare file sizes before upload, download, or compression decisions.

PDF Tools

Guides for merging, splitting, rotating, reordering, and turning images into PDF documents.

How to merge multiple PDF files

Upload several PDFs, adjust the order, and generate one combined file for sharing or filing.

How to split PDF pages

Split by page range, single pages, or fixed intervals when you only need part of a document.

How to convert images to PDF in batches

Upload screenshots, scans, or receipts and export them together as a PDF document.

Word Tools

Useful for batch replacement, extraction, renaming, and template-driven document workflows.

How to replace multiple keywords in Word files

Set up multiple find-and-replace rules and process repeated updates across contracts or notices.

How to extract images from Word documents

Upload a document and export the embedded images for review, reuse, or asset cleanup.

How to replace template variables in Word

Detect placeholders and swap them with actual values when generating repeated documents.

Spreadsheet Tools

Built for CSV, Excel, JSON, and Markdown table conversion, cleanup, and restructuring tasks.

How to convert CSV to Excel

Turn plain CSV exports into easier-to-share Excel files for coworkers or clients.

How to convert JSON data to CSV

Transform API responses or structured datasets into CSV for download, filtering, or import.

How to deduplicate rows and keep only needed columns

Clean signup lists, order sheets, or reports by removing duplicates and selecting the right fields.

Developer Tools

Fast utility workflows for JSON, Base64, URL, timestamps, JWT, hash, SQL, YAML, and more.

How to format JSON quickly

Turn minified or messy JSON into readable structure for debugging and inspection.

How to read a JWT payload

Decode the header and payload to inspect expiry time and claims without editing the token.

How to format SQL into readable layout

Expand one-line SQL into a cleaner structure so fields, conditions, and joins are easier to review.

Text Tools

Handy for text cleanup, replacement, counting, delimiter conversion, and lightweight diff checks.

How to remove extra spaces and blank lines

Clean copied text first so the next step is easier and more reliable.

How to compare two pieces of text

Use text diff to find additions, deletions, and edits in copy, notes, or configuration snippets.

How to switch between comma-separated and line-separated text

Useful for tags, lists, parameters, and quick text restructuring tasks.

View FAQ

If you are not sure whether a tool matches your file type or input, check the FAQ first.

Open Support

If uploads fail, conversions break, or consent and ad rendering look wrong, use the support page guidance.

Original Articles

Articles are loaded from content/articles. Each article lives in its own folder with localized markdown files.

2026-05-01Featured

What Is a PDF? A Simple Guide to Uses, Features, and Common Tasks

Learn what a PDF is, when to use it, how it differs from Word documents, and how to handle common PDF tasks.

PDFDocumentsOffice
2026-05-01

PDF vs Word: What Is the Difference and When Should You Use Each?

Understand the differences between PDF and Word in editing, layout, printing, collaboration, and delivery.

PDFWordFile Formats
2026-05-01

How to Merge PDF Files Online: Contracts, Invoices, and Document Packs

Learn when to merge PDFs, how to check page order, and what to watch for when combining PDF files online.

PDFMerge PDFOffice
2026-05-01

How to Split a PDF File by Pages: A Practical Guide

Learn when to split PDFs, how to choose page ranges, extract pages, and save clean new PDF files.

PDFSplit PDFExtract Pages
2026-05-01

How to Convert Images to PDF: Scans, Receipts, and Document Packs

Learn how to convert JPG and PNG images into PDF files while managing order, orientation, clarity, and file size.

PDFImage to PDFScans
2026-05-01

Image Compression Guide: How to Balance Quality, Size, and Format

Understand image compression, quality settings, resizing, file formats, and practical use cases.

Image CompressionImage ToolsWebP
2026-05-01

JPG vs PNG vs WebP vs AVIF: Which Image Format Should You Choose?

Compare JPG, PNG, WebP, and AVIF by use case, transparency, compression efficiency, and compatibility.

Image FormatsJPGWebP
2026-05-01

How to Resize Images: Width, Height, Ratio, and Pixels Explained

Learn image resizing basics, including width, height, pixels, aspect ratio lock, scaling, and upload size requirements.

Image ResizePixelsAspect Ratio
2026-05-01

How to Crop Images: Common Aspect Ratios and Practical Use Cases

Learn why cropping matters, common aspect ratios, avatar and cover cropping, document cropping, and how to avoid cutting important content.

Image CropAspect RatioImage Tools
2026-05-01

Brightness, Contrast, Saturation, and Sharpness Explained

Understand brightness, contrast, saturation, and sharpness, including what each setting does and how to adjust images safely.

Image EditingBrightnessContrast
2026-05-01

What Is Aspect Ratio? Common Image, Video, and Screen Ratios Explained

Understand what aspect ratio means, why it matters, and how to choose common ratios for images, videos, and screens.

Aspect RatioImage SizeDesign
2026-05-01

Image Size, Pixels, and Resolution Explained

Learn the difference between image size, pixels, resolution, and DPI, and how to choose the right settings for web, print, and uploads.

Image SizePixelsResolution
2026-05-01

Print Size Guide: Pixels, DPI, and Paper Sizes Explained

Understand how print size relates to pixels, DPI, and paper formats so printed photos, posters, and documents stay sharp.

Print SizeDPIPaper Size
2026-05-01

A4, A3, and Letter Paper Sizes Explained

Compare common paper sizes such as A4, A3, and Letter, and learn how to choose paper formats for office work, printing, and PDF export.

Paper SizeA4Printing
2026-05-01

KB, MB, GB, and TB Explained: File Size Units and Conversions

Understand common file size units and why images, videos, documents, and archives can have very different sizes.

File SizeUnit ConversionStorage
2026-05-01

How to Batch Replace Text in Word Documents

A practical guide to batch replacing text in Word documents such as contracts, notices, certificates, and project files.

WordBatch ReplaceDocuments
2026-05-01

How to Extract Images from Word Documents

Learn common ways to extract images from DOCX files for archiving, reuse, and content organization.

WordExtract ImagesDOCX
2026-05-01

Word to TXT: When and Why to Use Plain Text

Understand when converting Word to TXT is useful, what formatting is lost, and how plain text helps with search, copying, and processing.

WordTXTPlain Text
2026-05-01

Markdown vs HTML: Differences and Conversion Tips

Compare Markdown and HTML, including their strengths, use cases, and conversion tips for blogs, README files, knowledge bases, and web pages.

MarkdownHTMLConversion
2026-05-01

Why Convert DOCX to Markdown? Writing, Publishing, and Archiving Use Cases

Learn why converting Word to Markdown is useful for publishing, knowledge bases, developer docs, and long-term content maintenance.

DOCXMarkdownPublishing
2026-05-01Featured

CSV vs Excel: Which One Should You Use?

Understand the differences between CSV and Excel, when to use each format, and common issues in everyday data work.

CSVExcelSpreadsheets
2026-05-01Featured

How to Convert CSV to Excel: Encoding, Delimiters, and Common Issues

Learn how CSV-to-Excel conversion works, including encoding, delimiters, date formats, and garbled text issues.

CSVExcelConversion
2026-05-01Featured

CSV and JSON Conversion Guide for Developers and Data Work

Explain the structure of CSV and JSON, when to convert between them, and what to check during development.

CSVJSONData Conversion
2026-05-01Featured

CSV Data Cleaning Guide: Deduplicate, Remove Empty Rows, Sort, Split, and Merge

A practical guide to cleaning CSV files, including deduplication, empty row removal, sorting, splitting, and merging.

CSVData CleaningTables
2026-05-01Featured

How to Create Markdown Tables for Docs, Blogs, and README Files

Learn Markdown table syntax, alignment, common mistakes, and how to convert CSV data into Markdown tables.

MarkdownTablesDocs
2026-05-01Featured

What Is JSON Formatting and Why Is It Useful for Debugging?

Explain what JSON formatting does, the difference between minified and pretty JSON, and how it helps debugging.

JSONDeveloper ToolsFormatting
2026-05-01Featured

JSON Validation: Common Errors and How to Fix Them

Review common JSON validation errors, including commas, quotes, brackets, escape characters, and data types.

JSONValidationDebugging
2026-05-01Featured

What Is Base64? Encoding, Decoding, and Common Use Cases

A beginner-friendly guide to Base64 encoding, decoding, common use cases, and why it is not encryption.

Base64EncodingDeveloper Tools
2026-05-01Featured

What Is JWT and How to Decode Header, Payload, and Expiration?

Understand JWT structure, what Header and Payload mean, how to check expiration, and safety tips while debugging.

JWTDeveloper ToolsDebugging
2026-05-01Featured

Text Cleaning Guide: Remove Empty Lines, Deduplicate, Sort, and Replace

A practical guide to common text cleaning tasks such as removing empty lines, deduplicating, sorting, replacing, and delimiter conversion.

Text ToolsText CleaningProductivity