Guides & Tutorials
Detailed step-by-step guides for every tool on our platform — image conversion, AI PDF editing, developer utilities, and forex & finance calculators.
SEO Guides
On-page SEO, meta tags, keyword research, search intent and link building that actually works (6 Guides)
On-Page SEO Checklist: 15 Steps to Optimize Any Page
A practical on-page SEO checklist: indexability, titles, meta descriptions, headings, content, links, images and schema, with free tools.
How to Do Keyword Research for Free
How to do keyword research for free: find seed keywords, expand them with Autocomplete, check search intent and cluster them into pages.
How to Write Meta Titles and Descriptions That Get Clicks
How to write meta titles and descriptions that rank and get clicks: pixel length, keyword placement, formulas and why Google rewrites them.
Search Intent: The 5 Types and How to Match Them
What search intent is, its five types, how to identify the intent behind any keyword, and how to create content that ranks for each.
How to Get Backlinks for Your Website (Safely)
How to get backlinks safely: 12 white-hat link building strategies for new and small sites, and what Google considers link spam.
Heading Tags and Alt Text: The SEO & Accessibility Guide
How to use H1–H6 headings and image alt text for SEO and accessibility: one clear H1, a logical hierarchy and good alt text.
Security & Privacy Guides
Email authentication, strong passwords, SSL, security headers, safe links, checksums & JWTs (7 Guides)
How to Check and Set Up SPF, DKIM and DMARC
How to check SPF, DKIM and DMARC for any domain, what each record does, and how to set them up in Google Workspace and Microsoft 365.
How to Create a Strong Password You Can Remember
How to create a strong password you can actually remember: the passphrase method, how long it should be, examples, and what to avoid.
How to Verify a File Checksum (SHA-256, MD5)
How to verify a download's SHA-256 or MD5 checksum on Windows, Mac and Linux, with exact commands and a no-install online method.
How to Check an SSL Certificate (and When It Expires)
How to check a site's SSL certificate and expiry date in Chrome, online or on a server, and how to fix the most common SSL errors.
How to Add HTTP Security Headers to Your Website
How to add security headers — CSP, HSTS, X-Frame-Options and more — in Nginx, Apache, WordPress, Cloudflare and Next.js, with examples.
How to Check if a Link Is Safe Before You Click
How to check if a link is safe before you click it — on a computer, iPhone or Android — and the warning signs of phishing links.
How to Verify a JWT Signature
How to verify a JWT: decode vs verify, checking HS256 and RS256 signatures with a secret, public key or JWKS, and code for Node.js.
Developer & Security Utilities Guides
JWT decoding, Base64 encoding, SHA hashing, QR codes, & Unix timestamps (10 Guides)
App Store & Google Play Asset Specs & Mockups
The 2026 checklist of App Store and Google Play screenshot sizes, app icon specs, feature graphics and device mockup tips.
Generating Custom Vector QR Codes Offline
Generate custom high-resolution QR codes for URLs, Wi-Fi passwords, and contact cards with high error correction and vector SVG/PNG export.
Generating Web & App Favicon Packages
Convert any logo image into a full favicon package containing favicon.ico, apple-touch-icon.png (180x180), and Android manifest PNG icons.
Word Count, Character & Reading Time Analysis
Analyze text length, word count, character count (with/without spaces), sentence count, paragraph count, and estimated reading time offline.
JSON Formatting, Validation & Minification
Beautify messy single-line JSON responses with 2-space or 4-space indentation, validate syntax errors, and minify JSON for production.
Base64 Encoding & Decoding Guide
Translate text and binary data into ASCII Base64 strings for HTTP headers, data URLs, and API authorization tokens.
Generating Cryptographic Hashes (SHA & MD5)
Compute secure cryptographic hashes for text strings and API payloads using SHA-256, SHA-512, SHA-1, and MD5 hash functions offline.
Decoding & Inspecting JSON Web Tokens (JWT)
Inspect OAuth2 / OpenID JWT header claims, payload JSON data, expiration dates (exp, iat), and issuer signatures without leaking token secrets.
URL Encoding & Percent-Decoding Guide
Sanitize URL strings, query parameters, and URI components using standard percent-encoding (%20, %2F) to prevent HTTP request syntax errors.
Unix Epoch Timestamp Conversion Guide
Convert Unix epoch timestamps (seconds and milliseconds) to ISO 8601, UTC, and local date formats, or convert dates back to Unix timestamps.
Image & Converter Tools Guides
HEIC, PNG, JPG, WebP, SVG DPI scaling, image resizing & cropping (15 Guides)
How to Convert HEIC to JPG Privately
Step-by-step guide on converting Apple HEIC images to JPG format on PC, Mac, or mobile without losing photo quality or uploading files.
Converting iPhone HEIC Photos to Lossless PNG
Learn how to decode Apple HEIC files into high-resolution, lossless 32-bit PNG images with full transparency and zero compression artifacts.
How to Compress JPG, PNG & WebP Images
Master image optimization. Learn the difference between lossy and lossless compression, target file sizes, and batch shrinking images in browser.
How to Resize Images to Exact Dimensions
Complete guide to resizing photos and graphics. Master aspect ratio locking, percentage scaling, and social media image standard dimensions.
Mastering Interactive Photo Cropping & Framing
Learn how to use interactive crop handles, rule of thirds grid lines, and aspect ratio locks to frame photos perfectly on mobile and desktop.
Converting SVG Vectors to High-Resolution PNG & WebP
Learn how to rasterize SVG vector graphics to PNG or WebP images up to 8x scale or 600 DPI with custom background colors and live preview.
Converting PNG to JPG for Faster Load Times
Convert heavy PNG screenshots and graphics into lightweight JPG files. Learn when to convert and how to handle background transparency.
Converting JPG to PNG for Graphics & Editing
Convert JPG photos to PNG format for graphics editing, printing, and digital asset preparation with zero quality loss.
Converting JPG to Next-Gen WebP
Boost Google PageSpeed scores by converting JPG photos to Google WebP format for 30%+ file size savings at identical visual quality.
Converting PNG to WebP with Transparency
Shrink heavy PNG logos, illustrations, and screenshots by up to 70% by converting them to WebP while retaining full transparent backgrounds.
Converting WebP to JPG for Any Device
Convert WebP photos downloaded from websites back into standard JPG format for easy viewing, printing, and sharing on any software.
Converting WebP to Lossless PNG
Convert WebP images to lossless PNG format for graphic design editing, Figma layer imports, and Photoshop compatibility.
What Is a HEIC File?
HEIC is the image format iPhones use by default. Learn what a .heic file is, why Apple uses it, and how to open or convert it anywhere.
HEIC vs JPG vs PNG Comparison
HEIC vs JPG vs PNG compared — file size, quality, transparency and compatibility — so you know which format to use and when to convert.
Image Format Conversion Guide: PNG, JPG & WebP
When to convert PNG to JPG, JPG to WebP or WebP to PNG for faster pages, smaller files and compatibility everywhere.
PDF & Document Tools Guides
AI PDF editing, compression, watermarking, merging, splitting, & page organizing (9 Guides)
How to Edit PDF Text & Sign Documents Privately
How to edit text in a PDF, replace names and dates, add a signature and rotate pages — without uploading sensitive files.
How to Compress a PDF Without Uploading It
Most PDF compressors upload your file to a server. Here's how to shrink a PDF entirely in your browser — free and private.
Adding Text & Image Watermarks to PDF Contracts
How to protect PDFs with text watermarks and diagonal stamps: opacity, placement and page ranges, done privately in your browser.
Merging Multiple PDFs Into One Document
Combine PDF contracts, reports, scans, and invoices into a single unified document with visual thumbnail reordering and zero server uploads.
Splitting & Extracting PDF Pages
Extract specific page ranges (e.g., pages 1-5, 8, 12-15) or split a large PDF document into individual single-page files locally.
Organizing & Re-arranging PDF Pages
How to rotate PDF pages, reorder them and delete blank pages from scanned PDFs, without installing any desktop software.
Converting JPG Photos & Scans to PDF
Convert photos, receipts, or document scans saved as JPG into a single, professional multi-page PDF document.
Converting PDF Pages to JPG Images
Extract every page of a PDF document into high-definition 300 DPI JPG images for social media sharing, presentations, and design editing.
Converting PDF Pages to Transparent PNG
Convert PDF vector artwork, charts, and document pages into 32-bit PNG images with transparent backgrounds and sharp typography.
Video & Animation Tools Guides
Video compression, video to GIF conversion, trimming & privacy-first FFmpeg processing (1 Guides)
Forex Calculator Guides
Pip value, position sizing, margin, leverage, swap & risk management walkthroughs (10 Guides)
How to Calculate Pip Value in Forex
Step-by-step guide to calculating pip value for any currency pair, lot size and account currency, with worked EUR/USD and USD/JPY examples.
How to Size Your Forex Positions Correctly
Learn the position-sizing formula that risk-manages every forex trade to a fixed percentage of your account, with a worked example.
How to Calculate Forex Profit & Loss
Learn the exact formula for calculating profit or loss on a forex trade, for both long and short positions, converted to your account currency.
How Forex Margin Requirements Work
Learn how required margin is calculated from lot size, leverage and currency pair, with a worked example and margin-call explanation.
Forex Leverage Explained
Understand how leverage, margin and position value relate, with the formula to solve for any one given the other two.
Forex Lot Sizes Explained
Understand the four forex lot-size conventions and how to convert between units and lots in any of them.
Risk/Reward Ratio in Forex Explained
Learn how to calculate risk/reward ratio from entry, stop-loss and take-profit price, and the win rate it implies you need.
Forex Swap & Rollover Fees Explained
Understand how overnight swap/rollover costs are calculated, and why one weekday charges triple the normal rate.
Forex Broker Commission Explained
Understand the two common ways forex brokers quote commission, and how to calculate your exact trading cost either way.
How Currency Conversion Works
Learn how currency conversion works, the difference between direct and inverse rates, and how to convert any amount correctly.
Finance & Accounting Guides
Pricing, tax, break-even, depreciation & loan math for freelancers and small business (16 Guides)
How to Charge Late Payment Interest
Learn how to calculate late payment interest correctly and communicate it professionally when a client invoice goes overdue.
How to Calculate Your Freelance Rate
Learn the formula freelancers use to calculate an hourly or day rate that actually accounts for taxes, expenses and non-billable time.
Markup vs Margin Explained
Understand the difference between markup and margin, the two formulas, and why mixing them up quietly under-prices your products.
Quarterly Estimated Tax for the Self-Employed
Understand how self-employment tax is calculated and what the IRS safe-harbor rule means for your quarterly estimated payments.
How to Calculate Your Break-Even Point
Learn how to calculate the exact number of units and revenue you need to cover costs before turning a profit.
Splitting Business vs Personal Expenses
Mixing personal and business finances is the most common small-business bookkeeping mistake — here's how to split mixed expenses properly.
How to Calculate Discount Percentage
Learn how to calculate a discounted price from a percentage off, and how to work backward to find what discount was actually applied.
Straight-Line vs Declining Balance Depreciation
Understand the two standard depreciation methods, when to use each, and how to build a full depreciation schedule.
How to Calculate Sales Tax and VAT
Learn the correct formula for adding tax to a price, and for extracting tax from a tax-inclusive total — the two aren't symmetric.
How Loan EMI Is Calculated
Understand the standard EMI formula behind every fixed-rate amortizing loan, and why early payments are mostly interest.
How Much to Save for Taxes as a Freelancer
A practical, per-payment approach to setting aside money for taxes as a freelancer or self-employed person, so you're never caught short.
How to Calculate Cash Flow Runway
How to calculate how many months your business can survive at its current burn rate, and why most small businesses underestimate it.
No Tax on Tips & Overtime, Explained
A plain-English guide to the No Tax on Tips and Overtime deductions: who qualifies, the income phase-out and why FICA still applies.
Trump Account vs 529 Plan
How the new Trump Account (§530A) compares with a 529 plan: the $1,000 federal seed, contribution caps, taxes and when each wins.
RAP vs IBR: How to Choose
How the new Repayment Assistance Plan (RAP) compares with IBR: payments, forgiveness timelines and the traps most borrowers miss.
Landed Cost & Margin for Importers
How to turn supplier cost, tariffs, freight and fees into true landed cost and real margin — and why markup isn't margin.
AI Face Analysis Guides
How face analysis works, face shape & symmetry, and reading eyes, nose, lips & skin tone (3 Guides)
How AI Face Analysis Actually Works
How AI face analysis detects landmarks and estimates age and expression, what it can and can't tell you, and what happens to your photo.
Understanding Face Shape, Symmetry & the Golden Ratio
What face shape and symmetry mean, how AI measures them, why the golden ratio is only a guide, and how to use your results.
Reading Your Facial Features: Eyes, Nose, Lips & Skin Tone
How AI classifies eye, nose and lip shape and skin tone from a photo, what each category means, and how to use it for makeup and style.