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Ordering clothes or shoes from a foreign online store and not sure about the size? We explain how to convert sizes between the Russian, American, European, and British systems.

Need to figure out what changed between two versions of a document, config, or article? We explain how to compare two texts online and see added and removed lines.

Your regular expression isn't matching what you expect, or it's catching too much? We explain how to test a regex online in real time and see matches and capture groups.

Bought a 1 TB drive, but your system shows 931 GB? We explain how to convert between bits, bytes, KB, MB, GB, and TB — and why that discrepancy happens.

Your gauge reads PSI, but you're used to bar or atmospheres? We explain how to convert pressure between bar, atmospheres, PSI, pascals, and mmHg.

A car's specs are listed in mph, but you're used to km/h? We explain how to convert speed between kilometers per hour, meters per second, miles per hour, and knots.

Need to convert milliseconds to seconds, or figure out how many hours are in a work week? We explain how an online time unit converter works.

Writing a README, docs, or a blog post in Markdown and want to see how it'll look? We explain how to convert Markdown to HTML online with a live preview.

Need to flip text backwards, check a palindrome, or reverse a list of lines? We explain the three reversal modes for text and when each one is useful.

Need to fit within a character limit for a post, meta tag, or listing? We explain how an online counter tracks characters, words, and estimated reading time.

Came across meaningless Latin text in a design mockup? We explain what Lorem Ipsum is, where it came from, and how to quickly generate placeholder text for your own project.

Does your bank let you choose a loan payment schedule? We explain the difference between annuity (level) payments and declining-balance payments, and which ends up cheaper.

Need to know what Bitcoin or Ethereum is worth right now in your currency? We explain how an online crypto calculator works and where the exchange rates come from.

A document won't open in the program you need? We explain the difference between DOCX, ODT, RTF, and TXT, and how to convert a text document between these formats online.

A scanned document in a PDF won't let you select or search for text? We explain how to recognize text in a PDF online via OCR — and get copyable text or a PDF with a text layer.

Need to quickly turn a brochure, report, or image into a presentation format? We explain how to create a PPTX from a PDF document or an image online.

Need to send a presentation so the recipient can't accidentally change it, or get the slides as images? We explain the difference between PPTX to PDF and PPTX to JPG.

Need to send a spreadsheet so the recipient can't accidentally change it? We explain how to convert Excel (XLSX) to PDF online — and what happens with wide tables.

A table only exists as a PDF, but you need to work with it as regular data? We explain how to extract a table from PDF into Excel or CSV online — and when it won't work.

A program won't accept XLSX, or you need a proper spreadsheet from a CSV export? We explain the difference between the formats and how to convert between them online.

Need to cut a segment out of a recording or clip? We explain how to trim audio and video by start and end time online — quickly, with no re-encoding.

Need a short GIF from a video for a chat or social post? We explain how to trim a video clip and turn it into an animated GIF online, with no video-editing software.

Video too big for a messaging app or email limit? We explain how to reduce a video file's size online by changing its resolution, with no software to install.

A video won't open, or a platform rejects your file? We explain the difference between MP4, MOV, MKV, AVI, and WebM, and how to convert a clip to the format you need online.

A player won't open your audio file, or a recording takes up too much space? We explain the difference between MP3, WAV, FLAC, AAC, and OGG, and how to convert a file to the format you need.

Collecting receipts for an expense report or your accounting software? Photograph the document and turn it into a searchable PDF — no scanner, free, no sign-up.

WhatsApp recompresses almost every photo you send. Here's why that happens and how to send a photo at full quality — either as a document, or by compressing it yourself first.

Your site's icon not showing up in the browser tab? We explain what favicon.ico is, what kind of image works best for it, and how to create one online in a single step.

Need to cut out a product, portrait, or logo without a background? We explain how to automatically remove a photo's background online using AI — and get a transparent PNG.

How to apply a filter to a photo (black-and-white, sepia, blur) and add a watermark online — text or logo, with adjustable opacity and position.

Site loading slowly because of heavy photos, or an email rejected for exceeding the attachment limit? We explain how to properly compress JPG, PNG, GIF, and WebP without a visible quality loss.

SVG won’t open where a plain image file is expected? We explain how raster formats differ from vector SVG, and whether to choose PNG or JPG.

PDF is awkward to read on a small screen, and FB2 won’t open on an iPhone? Here’s how to convert PDF and FB2 to EPUB — and when PDF-to-EPUB conversion won’t work.

Kindle doesn’t read EPUB directly. Here’s how to convert EPUB to MOBI to send to a Kindle — and what to do the other way around if you need to read the book elsewhere.

Downloaded a book in an unfamiliar format? We explain the difference between EPUB, MOBI, FB2, and PDF, and which format to convert to for your specific device.

A spreadsheet export or email list turned into a mess? Five online tools for cleaning up text: duplicates, sorting, blank lines, numbering, find and replace.

What a WHOIS query shows, how to look up a domain's registrar and registration date online, and why the owner's name isn't always visible in the result.

What DNS record types exist (A, AAAA, MX, TXT, NS, SOA), what each is for, and how to quickly check them for any domain without opening a terminal.

Why compress code before publishing it on a site, what actually happens to HTML, CSS, and JS during minification, and how to turn compressed code back into something readable.

What CIDR notation means, how to calculate the network address, broadcast address, and host range from an IP/prefix, and what's special about /31 and /32 subnets.

How a SQL formatter adds indentation and line breaks to a query, which dialects it supports, and why that matters before a code review or a debugging session.

How XML and JSON differ, how attributes and repeated tags map onto JSON, and how to quickly convert data in both directions online.

What the five fields in a cron expression mean, how to read entries like */5 * * * * or 30 8 * * 1-5, and a free online cron expression decoder.

How to convert a number from decimal to binary and back: a clear step-by-step method with examples, a value table, and a free number base converter.

How many pounds are in one kilogram, the formula for converting kg to lbs and back, a table of common weight values, and a free mass converter.

What a HEX color code is, how the #RRGGBB format works, the formula for converting to RGB and back, a table of common colors, and a free color tool.

How to convert horsepower to kilowatts and back: the exact formula, a table of common engine power values, and a handy online power converter.

How to convert fuel consumption between liters per 100 km, kilometers per liter, and miles per gallon (MPG), with formulas, a table, and a free tool.

How Roman numerals work, the rules for writing them, a value table with examples for centuries and years, plus a free online converter tool.

What a slug is, why it matters for SEO, and how to turn any title into a clean, readable URL — the rules to follow, plus a free online generator tool.

What a JWT is, the three parts it’s made of, how to view its contents online for free, and why a token can be "decoded" but never forged by anyone.

A simple explanation of what Base64 is, why it exists, why it’s encoding rather than encryption, and how to encode or decode a string online.

Need to find the number of days between two dates — until an event, for a contract term, or to calculate age? Here are the methods and a handy date calculator.

How many centimeters are in an inch, the formula for converting cm to inches and back, a table of common sizes (screen diagonals, height), and a length converter.

A simple formula for converting Celsius to Fahrenheit and back, a handy table of common values, and a fast, accurate online temperature converter tool.

How many calories do you burn on a run? We break down what affects calorie burn while running, how much a 30-minute run burns, and how to calculate your own.

Need PDF pages as JPG images — for a presentation, sharing, or posting online? Here’s how to convert a PDF into images online, step by step.

Need to shrink an image down to a specific size in KB? Here’s how file size differs from resolution, and how to reduce a file online without losing quality.

Government portals and official forms often reject photos that are too large. Here’s how to shrink an image to a specific KB limit without losing quality.

How to correctly write a number and amount in words for a contract, invoice, or payment order: the rules, examples with cents, and how to do it automatically.

A simple explanation of what a UUID (GUID) is, how it’s structured, how versions differ, and where it’s used. Plus how to generate a UUID online in a second.

We explain the difference between PNG and JPG in plain terms: when each format works best, why PNG files are larger, and what to choose for photos, logos, screenshots.

How many calories does walking burn, and what does it depend on? We explain how calorie burn is calculated and compare walking with running and other activities.

What does body mass index show, how do you calculate it from height and weight, which values count as normal, and what are the limits of BMI as a health measure?

How many calories do you need per day? We explain in plain terms how the calorie norm is calculated (BMR and TDEE), how to set a deficit, and how to split macros.

How many grams are in a cup of flour? What about sugar? We explain why the weight depends on the ingredient and give a conversion table for cups, spoons, and milliliters.

A strong password protects your accounts from being hacked. We explain what makes a good password and how to generate one securely, right in your browser.

A QR code is a fast way to share a link, Wi-Fi password, or contact. Learn how to create a QR code online for free and download it for printing.

To make sure a document looks the same for everyone and doesn’t fall apart when opened, save it as PDF. Here’s how to convert Word (DOC, DOCX) to PDF online.

Need to edit text from a PDF? We explain how to convert PDF to Word (DOCX), what carries over well and what doesn’t, and why scans aren’t so easy to edit.

Need to send a photo or scan as a PDF document? Here’s how to convert JPG to PDF online and combine several images into one PDF in the right page order.

Windows won’t open your iPhone HEIC photos? Here are 4 fixes: convert to JPG online, install codecs from Microsoft Store, switch iPhone’s format, or use another app.

Is your PDF too big to upload or email? We explain why PDFs get so large and how to compress one without losing readability — online, no software needed.

Downloaded an image that won’t open because it’s WebP? Here’s what the format is, how to open it, and how to quickly convert WebP to JPG or PNG.

Need to pull music, a voiceover, or a podcast out of a video? Here’s how to extract the audio track from an MP4 and save it as MP3 online, no software needed.

Is Instagram cropping or compressing your photos in ways you don’t like? Here are the right dimensions and how to crop a photo to a clean 1080×1080 square online.

Need to combine a contract with its attachments, or several scanned pages, into a single document? Here’s how to merge PDFs online and set the right page order.