Guides
Practical how-to guides for everyday PDF, image, text, and developer tasks — each one links to the free tool that gets it done.
How to Merge PDF Files Online for Free (No Upload)
Combine multiple PDFs into one file in seconds, right in your browser. Step-by-step guide with a free, private PDF merge tool — no signup.
Read guideHow to Convert JPG to PNG (Free, in Your Browser)
Convert JPG photos to lossless PNG in seconds. Learn when to use PNG vs JPG and convert for free in your browser — no upload, no signup.
Read guideHow to Format and Validate JSON (Free Online Guide)
Beautify messy JSON, fix syntax errors, and validate structure in your browser. A practical guide with free JSON formatter and validator tools.
Read guideHow to Create a WiFi QR Code (Free, Guests Scan to Connect)
Make a QR code that connects phones to your WiFi instantly — no typing the password. Free WiFi QR code generator, all in your browser.
Read guideHow to Compress Images for the Web (Faster Pages, Free)
Reduce image file size without obvious quality loss to speed up your site. A practical guide using free, browser-based image tools — no upload.
Read guideHow to Calculate a Percentage (Simple Formulas + Free Tool)
Learn the three percentage formulas — percent of a number, percent change, and 'X is what percent of Y' — with examples and a free calculator.
Read guideHow to Calculate a Discount and Sale Price (Free Guide)
Work out the sale price and how much you save from a percent-off deal, with a simple formula and a free discount calculator.
Read guideHow to Convert CSV to JSON (Free, in Your Browser)
Turn CSV rows into a clean JSON array for APIs and code. Step-by-step guide with a free, private CSV to JSON converter — no upload.
Read guideHow to Generate a Strong Password (and Why It Matters)
What makes a password strong, how to create one, and how to manage it. Includes a free, private password generator that never stores anything.
Read guideHow to Decode a JWT (Header, Payload, and a Safety Note)
Understand JSON Web Tokens and read their header and payload safely in your browser. Free JWT decoder — decode only, signatures never verified.
Read guideHow to Compress a PDF Without Losing Too Much Quality (Free)
Shrink a large PDF so it fits an email or upload limit, without ruining readability. Free, private, browser-based — no signup, nothing uploaded.
Read guideHow to Make a Favicon From an Image (Free, No Signup)
Turn any image into a favicon with all the sizes modern browsers and phones need, plus the .ico file. Free, browser-based, no signup.
Read guideHow to Convert Images to AVIF (and Why It's Worth It)
AVIF makes images dramatically smaller than JPEG or WebP at the same quality. Learn when to use it, browser support, and how to convert for free.
Read guideHow to View and Remove EXIF Data From Your Photos
Photos can carry hidden EXIF metadata, including GPS coordinates. Learn how to view it and strip it before sharing — free and in your browser.
Read guideHow to Generate QR Codes in Bulk From a CSV (Free)
Create hundreds of QR codes at once from a CSV or list and download them as a ZIP. Free, private, browser-based bulk QR code generator — no signup.
Read guideWebP vs JPG: Which Image Format Should You Use?
WebP or JPG? A clear, practical breakdown of when each format wins — file size, quality, and compatibility — so you pick the right one every time.
Read guideWhat Is a SHA-256 Hash (and When to Use It)?
SHA-256 in plain English: what a hash is, why it's one-way and deterministic, and the right (and wrong) ways to use it. With a free hash generator.
Read guideWhat Is a UUID? Version 4 Explained Simply
A plain-English guide to UUIDs and UUID v4: how these 128-bit IDs work, why collisions are practically impossible, and when to use them. Free generator.
Read guideHow to URL-Encode a String (and Why It Matters)
Learn what URL encoding (percent-encoding) is, which characters need it, and when to use encodeURIComponent vs encodeURI. Free online URL encoder included.
Read guideHow to Reorder or Delete PDF Pages (Free, No Upload)
Rearrange or remove pages in a PDF right in your browser — no signup, no upload. A simple, private workflow for fixing page order and deleting extras.
Read guidePNG vs JPG: Which Format Should You Use?
Photos go in JPG, screenshots and transparency go in PNG — here's why, with real file-size numbers and a decision table so you never guess again.
Read guideMD5 vs SHA-256: Why MD5 Is Broken (and What to Use)
MD5 collisions can be forged in seconds on a laptop. Learn why MD5 fails for security, where it's still acceptable, and when SHA-256 is the answer.
Read guideIs Base64 Encryption? No — Here's the Difference
Base64 is encoding, not encryption — anyone can reverse it instantly with no key. What Base64 actually does, how it differs from encryption and hashing.
Read guideWhy Is My PDF So Large? (And How to Shrink It)
Oversized PDFs almost always come down to high-DPI scanned images, embedded fonts, or duplicated graphics. Find the cause and shrink it free in-browser.
Read guideQR Code vs Barcode: Which One Do You Need?
QR codes hold ~4,000 characters and scan with any phone; barcodes hold ~20 digits and need the right format for retail. How to pick the correct code.
Read guideEdit PDFs in Your Browser: The Complete Guide (No Upload)
Merge, split, reorder, rotate, compress, watermark, and number PDF pages — entirely in your browser. The complete guide to editing PDFs without uploads.
Read guideOptimize Images for the Web: The Complete Guide
Images are ~50% of page weight. Resize, pick WebP or AVIF, compress, and strip metadata — a complete, ordered workflow with free in-browser tools.
Read guideHow to Convert an Image to Base64 (for CSS & HTML)
Turn an image into a Base64 data URI you can paste straight into CSS or HTML. How the data:image format works, and when inlining helps vs hurts.
Read guideHow to Split a PDF Into Separate Files (Free, No Upload)
Split a PDF by page range, extract only the pages you need, or delete the ones you don't — all free in your browser, with nothing uploaded.
Read guideHow to Convert HEX to RGB (and Back)
What does a hex color like #1E90FF mean, and how do you turn it into rgb(30,144,255)? The format, the simple math, alpha channels, and a worked example.
Read guideHow to Add a Watermark to a PDF (Free)
Stamp DRAFT, CONFIDENTIAL, or a copyright line across every page of a PDF — free, in your browser, nothing uploaded. Positioning, opacity, and real limits.
Read guideCSV vs Excel (XLSX): Which Should You Use?
CSV or XLSX? CSV is plain, portable, and formatting-free; XLSX holds formulas, styles, and multiple sheets. A clear comparison table and when each wins.
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