How-to guides
Practical, no-nonsense guides for our free tools — how to actually get the job done.
How to Reduce Video File Size (Keep Quality, Just Make It Smaller)
Having trouble sending videos via KakaoTalk or email because they're too big? We've compiled methods to reduce the file size while minimizing quality loss, including free options.
Read →How to Combine Multiple Photos into One PDF
Need to combine receipt, documents, and handwritten notes into one PDF? We've compiled tips on how to combine photos into a PDF, including the order, specifications, and file size, in a neat and organized way.
Read →How to Make a Barcode for Free (EAN, UPC, Code 128: Which One to Use?)
Need a barcode for products, inventory, or labels but unsure which type to use? We summarize the differences in barcode types, how to choose by use case, free generation, and tips for printing and scanning.
Read →How to Make a KakaoTalk Theme (iPhone vs. Android Differences and Application)
Want to create your own KakaoTalk theme but it seems complicated? We've summarized the differences in file formats between iPhone (.ktheme) and Android (.apk), application methods, how to make one without coding, and what to check if it doesn't work.
Read →What's a Good Reaction Time — and How Do You Improve It?
What counts as a good reaction time, what affects how fast you react, and practical ways to improve it — plus a free test to measure yours.
Read →Word Count and Character Count: How to Check Text Length Online
Learn how to check word count and character count online, why the two differ, and why essay limits, tweets, and meta descriptions use different rules.
Read →How to Turn a Video Into a GIF
How to turn a video into a GIF that's actually usable — picking clip length, dimensions, and frame rate to keep file size down without losing clarity.
Read →How to Format and Validate JSON: A Practical Guide
Learn how to format and validate JSON — fix syntax errors like trailing commas, pretty-print for readability, and minify safely for production.
Read →How to Create a Strong Password You'll Actually Remember
Real advice on creating strong, unique passwords: why length beats complexity, how passphrases work, and when to use a generator or password manager.
Read →How to Remove the Background From an Image — Free, in Your Browser
A practical guide to removing image backgrounds for product photos, profile pics, and logos — free, in your browser, with tips for clean edges.
Read →How to Merge Multiple PDFs Into One File
Learn how to merge multiple PDF files into a single document in the right order, for free, directly in your browser — no install required.
Read →How to Compress a PDF File Online — Free and Fast
How to compress a PDF file online for free — why scanned PDFs get huge, how compression works, email/upload size limits, and keeping text sharp.
Read →How to Convert HEIC to JPG (Your iPhone Photos, Anywhere)
Stuck with an iPhone photo that won't open? Here's what HEIC is, why it causes trouble on Windows and some websites, and how to convert HEIC to JPG.
Read →How to Compress Images for the Web Without Losing Quality
How to compress images for the web the right way: lossy vs. lossless, target file size, WebP vs. JPEG, and checking your result before publishing.
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