Tool guides
Practical tutorials to get the most out of our free online tools.
Tool guidesWebP, JPG, PNG, AVIF: Which Image Format Should You Choose?
JPG for photos, PNG for transparency, WebP and AVIF for a fast web: we clarify each format, its uses and the right way to convert without losing quality.
Tool guidesHow to Merge PDFs for Free (No Software Needed)
Combine several PDFs into one clean document, with no software to install and without uploading your files to a server. Full method, tips and mistakes to avoid.
Tool guidesHow to Add a Watermark to a PDF (Confidential, Draft)
Mark a PDF as Confidential or Draft in a few clicks: style settings, preview before export, real-world cases and best practices for small businesses.
Tool guidesHow to Calculate VAT (Net and Gross) the Simple Way
Net/gross formulas, up-to-date French rates, worked examples and a step-by-step method to price your quotes and check your invoices without VAT errors.
Tool guidesHow to Calculate the Number of Days Between Two Dates
Calendar days, business days, holidays excluded or exact age: the reliable methods and common pitfalls to count days between two dates without ever getting it wrong.
Tool guidesHow to Calculate Your BMI and Interpret It Correctly
WHO formula, threshold table, step-by-step method, common mistakes and the limits of the index: the clear guide to calculate and interpret your BMI with confidence.
Tool guidesHow to Calculate a Percentage Without Mistakes
Discounts, increases, VAT, changes: the coefficient method to calculate a percentage without errors and dodge the successive-percentage trap, with concrete examples for small businesses.
Tool guidesHow to Calculate a Weighted Average With Coefficients
The weighted average formula explained step by step: coefficients, concrete examples, target-score calculation and everyday uses in small businesses.
Tool guidesOnline Stopwatch and Timer: Everyday Uses
Time-boxing, Pomodoro, cooking, sport, billing: see how a simple online stopwatch and timer can structure your days and those of your small business.
Tool guidesHow to Split a PDF Into Multiple Files for Free
Extract pages, break up a large PDF, or split a batch scan with no software: step-by-step method, real small-business cases, and 100% local processing.
Tool guidesHow to Compress a PDF Without Losing Quality: The Guide
Why a PDF gets heavy, how to compress it without losing quality, the step-by-step method, common mistakes, the limits to know and the alternatives when compression isn't enough.
Tool guidesCompress an Image Without Any Visible Loss of Quality
Shrink an image without degrading it: the right five-step method, the formats to choose, the settings that matter and the mistakes to avoid for a faster site.
Tool guidesCount Words and Characters of a Text Online
Social media, SEO, essays, writing quotes: every context sets its own word and character limits. Here is the method to master them effortlessly and error-free.
Tool guidesConvert a PDF to an Image (JPG, PNG) the Easy Way
JPG or PNG? Which resolution? The clear guide to turning your PDFs into sharp images, with no software to install and no compromise on privacy.
Tool guidesHow to Convert an iPhone HEIC Photo to JPG
The iPhone's HEIC format often blocks your shares, emails and prints. Here's why, and how to convert your photos to JPG easily, with no software to install.
Tool guidesHow to create a strong, secure password
Length, passphrases, password managers and two-factor authentication: the step-by-step method to build genuinely strong passwords and keep your business from being hacked.
Tool guidesHow to Unlock a Password-Protected PDF You Own
You know the password but have to type it every single time? Here is how to remove the protection legally, cleanly and in seconds, without putting your sensitive data at risk.
Tool guidesEdit a PDF Online: Add Text and Annotations
Filling in a form, adding a note or marking up a contract: editing a PDF online is now simple. Step-by-step method, use cases and pitfalls to avoid for small businesses.
Tool guidesEstimating Closing Costs on a Property Purchase
Existing or new-build, real breakdown, worked examples and a step-by-step method to estimate your closing costs before signing, with no nasty surprises.
Tool guidesExtract Text From an Image or Scan (OCR)
How to extract text from a photo or scan using OCR: a step-by-step method, supported languages, common mistakes, and privacy best practices.
Tool guidesGenerate Lorem Ipsum placeholder text for your mockups
Origin, design uses, a method for dosing it, and clean HTML integration of Lorem Ipsum placeholder text to build credible mockups without waiting for final content.
Tool guidesGenerate an original, available username
Find a username that is original, memorable and still free everywhere: selection criteria, five generation methods, availability checks and lasting protection.
Tool guidesCreate a Custom QR Code for Free
QR code types, colors, logos, marketing uses and mistakes to avoid: the practical guide to creating a free custom QR code that actually scans on the first try.
Tool guidesHow to Number PDF Pages Automatically
Numbering formats, on-page position, custom ranges, and mistakes to avoid: the complete guide to paginating your PDFs automatically, without installing any software.
Tool guidesHow to Rotate Wrongly Oriented PDF Pages
Scans upside down or sideways: the step-by-step way to fix a PDF's pages, pick the right angle and save a clean, ready-to-send document.
Tool guidesHow to Password-Protect a PDF for Free
Encrypt a PDF without paid software: the step-by-step method, a truly strong password, mistakes to avoid and real small-business use cases.
Tool guidesResizing an Image to the Right Dimensions
Social formats, ratio, resolution, file size: the complete method to resize your images without distorting or bloating them, with the right benchmarks per platform.
Tool guidesReorder and Delete Pages in a PDF
Reordering, deleting or rotating pages in a PDF is simple with drag and drop. Step-by-step method, real cases and mistakes to avoid for small businesses.
Tool guidesHow to Sign a PDF Electronically for Free
Drawn or typed signature, legal value, a step-by-step method and mistakes to avoid: sign your PDFs for free, with no software to install.
Tool guidesSimulating a Mortgage: Monthly Payment and Total Cost
Principal, rate, term, insurance and amortization schedule: the step-by-step method to calculate your monthly payment and the real cost of a mortgage.
Tool guidesHow to Remove an Image Background Automatically
AI cutout, transparent background, consistent product photos: the complete method to remove an image background in seconds, with no software and no design skills.
Tool guidesTurn Images Into a PDF in Just a Few Clicks
Combine several images into a single, well-ordered PDF that's ready to send: step-by-step method, real cases for small businesses, mistakes to avoid and how to choose.
Tool guidesUsing an Online Metronome to Improve Your Musicianship
Tempo, time signatures, tap tempo, a step-by-step method: how an online metronome turns intuitive practice into measurable, lasting progress.