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Practical guides on privacy, documents, images and text
How to Calculate Percentage Increase (Formula + Examples)
Learn the percentage increase formula, see worked examples for percent change and percentage decrease, and avoid the mistakes that give wrong answers.
Read article →WiFi QR Code Generator: How to Create and Share One Safely
Learn how to create a WiFi QR code guests can scan to join your network in one tap, what the WIFI: string contains, and the security rules before you print it.
Read article →How to Compress Images Without Losing Quality: Resize First, Then Encode
Learn how to reduce image file size without visible quality loss. Resize first, pick the right format, and compress images in your browser with no upload.
Read article →How to Remove Duplicate Lines From Text Without Breaking Your Data
Deduplicate a list of emails, IDs or keywords in seconds. Learn how case sensitivity, whitespace and sort order change the result, all done in your browser.
Read article →How to Format and Validate JSON: A Practical JSON Formatter Guide
Fix invalid JSON fast: trailing commas, quotes, comments and brackets explained, plus how a JSON formatter, validator and beautifier work in your browser.
Read article →Unix Timestamp Converter Guide: Epoch Time, Seconds vs Milliseconds
A practical epoch time converter guide: what Unix timestamps count, the seconds vs milliseconds trap, time zones, negative values, Y2038 and local conversion.
Read article →UTM Parameters Explained: A Practical UTM Builder Guide
What UTM parameters actually do, the five tags every campaign tracking URL needs, and the naming habits that quietly corrupt your analytics reports.
Read article →Passport Photo Requirements and Size: What Gets Accepted
Passport photo requirements by country: print size in mm and inches, head height, pixel dimensions for online applications, and the reasons photos get rejected.
Read article →Title Case vs Sentence Case: Which Capitalization Rules Apply
Title case converter rules explained: which words stay lowercase, how APA, Chicago and AP differ, and where sentence case now beats title case in UI.
Read article →Social Media Character Limits 2026: X, Instagram, TikTok, LinkedIn
Twitter character count, Instagram caption length, TikTok and LinkedIn post limits as of late 2026, plus how URLs and emoji change the numbers you plan around.
Read article →How to Count Chinese Characters: Words vs. Characters Explained
Chinese has no spaces between words, so counting is different from English. Learn what a character count really means and how to count accurately.
Read article →Why In-Browser Tools Are Safer: Understanding Local File Processing
Most online tools upload your file to a server. In-browser tools do not. Here is what local processing means and why it matters for sensitive documents.
Read article →File Metadata Explained: The Hidden Data You Share Without Knowing
Photos, PDFs and documents carry hidden metadata like GPS location, author names and edit history. Learn what is stored and how to remove it.
Read article →How to Reduce PDF File Size Without Losing Quality
Large PDFs are slow to email and upload. Learn why PDFs get big and the practical techniques to shrink them while keeping text and images sharp.
Read article →JPG vs PNG vs WebP vs HEIC: Which Image Format Should You Use?
A plain-language comparison of the common image formats, when each one wins, and how to convert between them for the web and for sharing.
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