Remove Duplicate Lines
Deduplicate line-based lists while optionally preserving first-seen order — useful for exports and keyword sheets.
Guides
Practical explanations that pair with our tools — read a minute, then run the numbers.
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How to Calculate Reading Time
Estimated reading time ≈ word count ÷ words-per-minute. Many publishers use ~200–250 WPM.
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Text Case Conventions
Case conversion standardises strings for titles, code and campaign naming. Analytics parameters should stay lowercase.
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Word and Character Counts
Live word and character counts help you hit limits for ads, titles and briefs.
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Unix Timestamps Explained
Unix time counts seconds (or milliseconds) since 1970-01-01 UTC. Logs and APIs use it constantly.
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URL Encoding Explained
Percent-encoding makes reserved characters safe in query strings and paths.
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What Is Base64 Encoding?
Base64 encodes bytes into ASCII for transport. It is encoding — not encryption.
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What Is JSON and How to Format It?
JSON is structured text for data interchange. Invalid commas, quotes or brackets cause parse errors.
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How to Compress PDF Files
Shrink PDF payloads for email and portals. Results vary by embedded images — there is no fixed reduction…
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How to Split PDF Files
Extract page ranges or split a PDF into parts without uploading for basic jobs.
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How to Merge PDF Files Online
Order files carefully, keep originals, and prefer browser-local merge for sensitive docs.
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Browser-Local Tools vs Upload Suites
Upload suites send bytes to a vendor. Browser-local tools keep drafts on-device with Canvas, pdf-lib or pdf.js.
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How to Crop Images for Channels
Crop for story and safe zones first, then resize to exact pixel specs for each channel.
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JPG vs PNG vs WebP: Which Format Should You Use?
JPG for photos, PNG for sharp graphics/transparency, WebP when you want strong modern compression.
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How to Resize Images for the Web
Serve images close to the largest size you actually display. Upscaling soft sources will not invent detail.
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How to Compress Images Without Losing Too Much Quality
Resize to display size, prefer modern formats when allowed, then compress — and keep originals.
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How to Set a Freelance Hourly Rate
Divide target income by realistic billable weeks and hours so your rate funds non-billable time.
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How to Calculate VAT
VAT calculators add tax to a net amount or extract tax from a gross amount at a rate…
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Margin vs Markup Worked Examples
Markup and margin are related but not interchangeable. Quote the right one when briefing freelancers or finance.
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How to Calculate Gross Profit Margin
Gross profit = Revenue − COGS. Gross margin % = Gross profit ÷ Revenue × 100.
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Profit Margin vs Markup: What’s the Difference?
Markup is profit as a percentage of cost. Margin is profit as a percentage of revenue. A 50%…
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ROAS by Channel: Planning Benchmarks Without False Precision
Channels do not share one efficient ROAS. Prefer your own history over generic internet tables.
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UTM Hygiene for Teams
Agree a lowercase taxonomy for source, medium and campaign. Ban spaces and personal data. Document who owns naming.
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How to Build UTM Tracking Links
UTM parameters tag campaign traffic. Set at least utm_source, utm_medium and utm_campaign — lowercase and consistent.
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How Much Should You Spend on Google Ads?
Start with a test budget large enough to exit learning, then scale campaigns that hit your target CPA…
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CPM vs CPC vs CPA: What’s the Difference?
CPM prices impressions, CPC prices clicks, and CPA prices acquisitions. Match the buying model to the objective.
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How to Calculate CTR
Click-through rate is clicks divided by impressions. It measures creative and relevance — not conversion by itself.
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How to Calculate CPM
CPM is the cost of one thousand impressions. It is useful for reach and awareness buying — not…
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How to Calculate Cost Per Click
Cost per click (CPC) is total ad spend divided by clicks. A low CPC helps only when those…
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What Is ROAS? Formula, Examples and Interpretation
ROAS (return on ad spend) answers how much revenue you generated for each unit of currency spent on…