Guides
Straight answers to the questions behind the tools — formats, quality, privacy and encodings, explained without fluff.
PNG vs JPG vs WebP: Which Image Format Should You Use?PNG vs JPG vs WebP compared: lossless vs lossy, transparency, file size, and exactly when to use each format for photos, logos, and fast web pages.Image ToolsHow to Compress Images Without Losing QualityLearn how to compress images without visible quality loss: what 70–85% quality really means, lossy vs lossless, resizing first, and mistakes to avoid.Image ToolsHow to Merge PDFs Without Uploading Them AnywhereMerge PDFs without uploading them to a server. Learn why most online PDF tools upload your files, the privacy risks, and how in-browser merging keeps them local.PDF ToolsWhat Is Base64? A Clear Explainer for DevelopersWhat is Base64? How the encoding works (6 bits per character, padding =), why it exists, common uses in data URLs and JWTs, and why it is not encryption.Developer ToolsHow to Convert HEIC to JPG on Windows (Free, No Upload)Convert HEIC to JPG on Windows 11 for free without installing anything. Bulk-convert iPhone photos in your browser — files never leave your device.Image ToolsHow to Reduce PDF File Size Without Losing QualityShrink a PDF that's too big to email or upload without wrecking quality. Learn why PDFs get large and the image-first workflow that keeps text crisp.PDF ToolsHow to Convert JPG to PDF for Free (No Watermark, No Upload)Combine JPGs into one PDF for free with no watermark and no upload. Order pages, choose JPG or PNG, and keep scanned IDs and contracts private.PDF ToolsHow Base64 Encoding Works (and Why It's Not Encryption)Base64 maps every 3 bytes to 4 ASCII characters, adding about 33% size overhead. Learn the bit-level mechanics, the = padding, Base64URL, and why it is not encryption.Developer ToolsSocial Media Image Sizes: The 2026 Cheat SheetThe current 2026 image dimensions for Instagram, YouTube, Facebook, X, LinkedIn, TikTok, Pinterest, and more, in one table, plus why aspect ratio beats exact pixels.Image ToolsHow to Decode a JWT Token Safely (What's Inside It)A JWT is three Base64URL-encoded parts anyone can decode without a secret. Learn to read the header, payload, and standard claims, and why decoding is not verifying.Developer Tools