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Practical guides for real tasks — written by the people building the tools on this site.
Showing 1,954–1,974 of 2,464 articles
📡 Network
How to Check a Domain's Mail Server MX Records
Look up how a domain's MX (mail server) records would be reported, with a clear priority and host table, for email deliverability troubleshooting.
🎓 Education
How to Check a Passage's Reading Grade Level
Paste any passage and get its Flesch Reading Ease and Flesch-Kincaid Grade Level, computed live as you type, before you publish or send it to an audience.
📐 Design & Color
How to Check a Photo's Composition With a Rule-of-Thirds Grid
Overlay a rule-of-thirds grid and power points on any photo to check composition, then download the result, for stronger, more balanced framing.
🛡️ Security & Privacy
How to Check a URL's Structure for Red Flags Offline
Check a URL's structure against common red flags, with honest hand-verified notes for a few reference domains — no live threat-database call is made.
📹 Video & Audio
How to Check a Video File's Duration and Bitrate
View a video file's duration, dimensions, aspect ratio, and estimated bitrate instantly, without opening dedicated video editing software just to check.
📊 Data & CSV
How to Check If Your A/B Test Is Significant
Run a two-proportion z-test on your A/B test conversion rates to check statistical significance, uplift, and p-value before you decide the result is real.
🌐 Network
How to Check If Your DNS Changes Have Propagated
Check whether a domain's DNS record has propagated across resolvers in multiple regions, shown in a clean location-by-location table, before you assume it's broken.
🚫 Social Media
How to Check If Your Hashtags Are Shadowbanned
Paste a caption or hashtag list and check it against a reference list of previously reported flagged or shadowbanned hashtags before your post goes live.
📌 SEO & Web
How to Check if Your Image Fits Pinterest's Pin Ratio
Enter your image dimensions and instantly see whether it matches Pinterest's recommended 2:3 Pin ratio, with a live preview, before you post.
🔎 SEO & Web
How to Check Keyword Density Before You Publish
Paste any page content and see keyword and phrase density, ranked and filtered for common stop words, updated live as you type, before it goes live.
🕵️ Security & Privacy
How to Check What Your Browser Reveals About You
See the user agent, screen, timezone, language, and canvas fingerprint data any website can read from your browser, all displayed locally with nothing sent anywhere.
🎬 Social Media
How to Check Your Video Caption Line Length
Check video caption lines against a max character limit and estimate reading speed for a given video duration, before viewers complain captions fly by too fast.
🗓️ Data & CSV
How to Clean Up a List of Mixed Date Formats
Paste a list of dates in mixed formats and convert them all to a single consistent format, with unrecognized dates flagged, before an import fails silently.
📄 PDF Tools
How to Combine JPG Images Into a Single PDF
Combine one or more JPG or PNG images into a single PDF document, for sending scanned pages, receipts, or a photo set as one clean file instead of loose images.
🔍 Developer
How to Compare Two Blocks of Text or Code Side by Side
Compare two blocks of text or code side by side with an LCS line diff, added and removed lines highlighted, and a running change count, right in your browser.
🧾 Developer
How to Compare Two JSON Objects Structurally
Compare two JSON objects field by field, ignoring key order, with added, removed, and changed values clearly color-coded, instead of eyeballing two blobs.
🏛️ Date & Time
How to Convert a Date Into Roman Numerals
Convert any date into a Roman numeral string in DD.MM.YYYY, MM/DD/YYYY, or year-only format, popular for tattoos, engravings, and anniversary gifts.
🐳 Developer
How to Convert a Docker Run Command to Compose
Paste a docker run command and get an equivalent docker-compose.yml, with ports, environment variables, and volumes mapped correctly, without hand-translating flags.
🎬 Video & Audio
How to Convert a Video File Without Uploading It Anywhere
Convert video files between MP4, WebM, MOV, AVI, and MKV using WebAssembly, entirely in your browser, without your video ever leaving your device.
📖 PDF Tools
How to Convert an FB2 File to EPUB
Convert an FB2 e-book's title, author, and chapter text into a valid, downloadable EPUB file, for reading on devices and apps that don't support FB2.
🎬 Video & Audio
How to Convert an MKV File to MP4 Without Re-Encoding
Remux an MKV file into an MP4 container without re-encoding, keeping the original quality, for the times a device or app just won't play MKV.