Guides and How-Tos
These practical guides explain how to get everyday file tasks done and why the steps work. Learn how to compress, merge and protect PDFs, pick the right image format, prepare images for the web and social media, print QR codes that scan, and understand developer formats such as JSON, Base64 and JWT. Each guide links to the free browser-based tool that does the job.
Image
JPG vs PNG vs WebP: Choosing the Right Image FormatJPG, PNG or WebP? Learn how each image format compresses images, how they handle transparency and quality, and which one to choose for photos, logos and the web.How to Compress Images for the WebMake images load faster: resize to the right dimensions, choose a modern format, set quality and strip metadata. A practical workflow with free browser tools.Social media image sizes and aspect ratiosPrepare square, portrait, vertical and banner images with common working sizes. Learn crop versus contain, export quality and what to verify before posting.How to Make a Favicon for Your WebsiteCreate a favicon package from one image: favicon.ico, PNG icons, an Apple touch icon and a web manifest. Learn which sizes you need and how to add them to a site.How to Remove Metadata from PhotosPhotos can reveal where and when they were taken. Learn what EXIF, GPS and XMP metadata contain, how to check a photo and how to remove metadata before sharing.
How to Compress a PDFLearn how to reduce PDF file size in your browser, when lossless compression is enough, when to flatten scans, and how to keep text, links and forms intact.How to Merge PDF FilesCombine several PDFs into one file in your browser. Learn how to set the order, prepare pages, handle passwords and forms, and finish the merged document.How to Sign a PDF OnlineSign a PDF in your browser by drawing your signature or using an image of it. Learn how visual and digital signatures differ and how to place a signature well.How to Password Protect a PDFAdd a password to a PDF with AES-256 encryption in your browser. Learn how PDF passwords work, how to choose a strong one and how to remove it later.How to Split a PDFSplit a PDF into single pages or custom page ranges in your browser. Learn the range syntax, when to extract or delete pages instead, and how to name results.
QR & Barcode
How to create a WiFi QR codeMake a WiFi QR code that lets guests join your network with one scan. Learn the WIFI: payload format, security types, safety tips and how to fix scan issues.QR code printing best practicesPrint QR codes that scan the first time. Learn quiet zone, contrast, minimum size, error correction, file formats and testing for labels, posters and packaging.Barcode types explainedCompare EAN-13, UPC-A, Code 128, Code 39 and ITF barcodes. Learn which type to use for retail, shipping or inventory and how check digits catch scan errors.
Text
How to count words and estimate reading timeLearn how word counters decide what a word is, how characters, sentences and paragraphs are counted, and how reading and speaking time are estimated from them.Text case styles explainedA guide to camelCase, PascalCase, snake_case, kebab-case, Title Case and Sentence case: where each convention is used and how to convert text between them fast.
Developer
How to format and validate JSONFormat messy JSON into readable, indented text, validate it, and fix the most common syntax errors: trailing commas, single quotes, unquoted keys and comments.What is Base64 encoding?Base64 turns binary data into plain text using 64 safe characters. Learn how it works, why it adds about 33% to size, Base64url, and why it is not encryption.How JWT tokens workUnderstand JSON Web Tokens: the header, payload and signature, standard claims like exp and iat, how signing works, and why decoding a JWT is not verifying it.Regex cheat sheetA practical regex cheat sheet: character classes, anchors, quantifiers, groups, lookarounds and flags, with tested examples you can try in your browser.Unix timestamps explainedWhat a Unix timestamp is, how to tell seconds from milliseconds, how time zones affect display, why 2038 matters, and how to convert epoch time to dates.YAML vs JSONCompare YAML and JSON: syntax, comments, data types, readability and pitfalls like the Norway problem, plus when to use each and how to convert between them.