Guides
Every guide here is long enough to actually answer the question, names the sources it relies on, and carries the date it was last reviewed. Where a rule depends on your country, we say so rather than pretending there is one global answer.
You downloaded an image and it will not open. Or your site is slow and someone said convert to WebP. These are opposite problems — here is which one you have, and what each conversion costs.
Why forms ask for a PDF rather than photos, how to combine several images into one file on any device without installing anything, and the page-size and orientation traps that make the result look wrong.
Upload forms give you a byte limit, not a quality setting. How to hit a specific file size without guessing, why the limit exists, and what to do when the image will not go small enough.
Two different problems that both get called 'making an image smaller' — and why reaching for the quality slider when you needed to resize is the most common reason images stay too heavy.
Why an iPhone photo arrives as a .heic file that Windows, older software and half the web will not open — and the four ways to convert it, including the setting that stops it happening again.
Email has different rules from the web: hard attachment limits, encoding overhead that inflates every file by a third, and clients that cannot open WebP. Here is how to get photographs small enough to send while still looking right.
Images are the single largest lever on LCP and a common cause of layout shift. Here is what each Core Web Vital measures, the thresholds Google uses, and exactly which image decisions move which metric.
The quality slider is the third most important decision, not the first. Work through dimensions, format and quality in that order and you can routinely cut image weight by 80% with no visible difference.
The difference between these formats is not quality — it is what each one assumes about your image. Understand the assumption and the choice becomes obvious, including why compressing a PNG sometimes makes it bigger.
QR codes are useful in exactly one situation — where typing would be awkward and a tap is not available. Here are the uses that earn their place, the ones that waste your printing budget, and how to make a code that actually scans.
Electronic signatures have the same legal effect as ink in almost every US transaction — but 'almost' is carrying real weight. Here is what ESIGN and UETA actually say, the categories they explicitly exclude, and how to sign in a way that survives a challenge.
Emailing a PDF is not the same thing as e-invoicing, and in a growing list of countries the difference is now a legal one. What online invoicing actually involves, what it costs, and which rules are coming for you.
Almost every 'free' invoicing product is free to send and paid to get paid. Here is where the money really sits, which limits you will hit first, and how to tell whether you need software at all.
A proforma invoice is not an invoice, does not create a VAT liability, and cannot be used to reclaim VAT. Here is a free proforma invoice template and the rules that make the distinction matter.
A VAT invoice is a different document with its own mandatory list. Here is a free UK VAT invoice template, every field HMRC requires, how the tax point works, and when a simplified invoice is allowed instead.
A free invoice template for UK sole traders and self-employed workers, with the fields GOV.UK actually requires, when you must add VAT, and how long HMRC expects you to keep the records.
A copy-paste freelance invoice template, and the fields that matter specifically to freelance work — deposits, hourly versus project billing, expenses, kill fees, and what to do when a client goes quiet.
A complete walkthrough of making an invoice online at no cost — what every field is for, which free tools attach strings, and how to send it so it actually gets paid rather than sitting in an approval queue.
A complete invoice template you can copy and use today, plus what every field is for, how US and UK requirements differ, and the template mistakes that quietly delay payment.
You do not need QuickBooks to send your first invoice. Four approaches that work with what you already have, what each one is genuinely good at, and the point at which you should stop and buy something.
A professional invoice is not a design problem. It is a document that gets approved by someone who has never met you, on the first pass, without a single email. Here is how to build one.
Net 30 is the default because it is the default, not because it is right for you. Here is what each term actually costs a freelancer in cash-flow terms, when a shorter term backfires, and the legal limits on how long a client can make you wait.
UK invoicing has actual legal requirements — different ones for sole traders, limited companies and VAT-registered businesses. Here is exactly what GOV.UK requires on each, plus the statutory late-payment rights most freelancers never use.
There is no federal law dictating what a US invoice must contain — but there is a list of fields that gets you paid, and a shorter list the IRS cares about. Here is what belongs on the document, what does not, and where the rules actually come from.
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