The Carbide blog
Practical articles, tips and comparisons for getting more done with free online tools — private, in your browser, no sign-up.
Age calculator — your exact age and days between dates
Free age calculator — exact age in years, months and days, plus days between any two dates. Instant, private — your birth date stays on your device.
Read articleImage ConverterAVIF converter — AVIF to JPG, PNG, WebP and back
Convert AVIF to JPG, PNG or WebP — and encode images to AVIF — free in your browser. Nothing uploaded, no sign-up, no daily limits. Quality slider included.
Read articleEditorsBase64 decode, URL encode & HTML entities explained
Decode Base64, percent-encode URLs and escape HTML entities free in your browser. Understand what each does — nothing is uploaded.
Read articleDocuments & PDFThe best free online PDF tools (no uploads, no sign-up)
The best free online PDF tools for merging, splitting, rotating and converting — running entirely in your browser with no uploads, no sign-up and no watermarks.
Read articleCalculators & ConvertersBMI calculator — healthy ranges and what BMI means
Check your BMI with a free calculator and see the healthy range (18.5–24.9). Formula in kg and lb, category table and limits — all in your browser.
Read articleText & ProductivityCharacter counter & case converter — count, transform text
Free character counter and case converter — count characters, words, sentences and reading time, then change case in one tap. Text stays in your browser.
Read articleEditorsCode formatter & minifier — HTML, CSS, JS and XML
Free code formatter and minifier for HTML, CSS, JavaScript and XML. Beautify messy code or minify it to ship smaller — all in your browser, nothing uploaded.
Read articleEditorsCode to image — beautiful code screenshots free
Turn code into beautiful, shareable images free — syntax themes, gradient backgrounds and PNG export, all in your browser. Your code never leaves your device.
Read articleMedia & FunColor picker & CSS gradient generator for designers
Free online color picker and CSS gradient generator — read HEX, RGB and HSL instantly, grab a color code from an image and copy gradient CSS in one click.
Read articleMeasurementCompass & altimeter apps — find north and altitude
How a phone compass and altimeter app work — find magnetic north, calibrate, and read your altitude. Free and offline in the Carbide app, coming soon.
Read articleImage ConverterSVG, GIF, BMP, TIFF & ICO — convert legacy image formats
Convert SVG to PNG plus GIF, BMP, TIFF and ICO to modern image formats — free, in your browser, nothing uploaded. No sign-up, no limits.
Read articleCalculators & ConvertersCurrency converter — live rates and how conversion works
Free currency converter with live exchange rates for 150+ currencies — no sign-up, no upsells. See how the mid-market rate works and check USD to EGP fast.
Read articleEditorsDiff checker — compare two texts or code side by side
Free diff checker to compare two texts or code blocks side by side — added, removed and changed lines highlighted, running entirely in your browser with no upload.
Read articleNetworkingDNS lookup & WHOIS — check any domain's records and owner
Free DNS lookup for A, MX, TXT and NS records plus WHOIS via RDAP — see any domain's registrar, expiry and status. No sign-up, right in your browser.
Read articleEmail ToolsEmail signature generator, mail merge & mailto links
Free email signature generator — no sign-up, no watermark. Plus in-browser mail merge with {{placeholders}} and a mailto link builder with subject and cc.
Read articleEmail ToolsEmail validator & extractor — check and pull addresses
Free email validator and extractor: check syntax, domain and MX records, fix typos, and pull every address out of any text. No sign-up, nothing stored.
Read articleCodes & GeneratorsQR code generator — free codes that never expire
Free QR code generator for links, text and Wi-Fi — codes never expire, no sign-up, generated in your browser. Download and print at any size.
Read articleMedia & FunGIF maker & photo video — turn photos into GIFs and clips
Turn photos into an animated GIF or a video with music — free GIF maker from images, no watermark, no sign-up, and nothing is uploaded from your browser.
Read articleGold & SilverGold calculator — value by karat, making charge & bullion
Free gold calculator: value your gold by weight, karat and making charge, convert between karats and price bars, pounds and coins in your currency.
Read articleGold & SilverGold price today — live gold and silver rates by karat
Gold price today, live by karat — 24K, 22K, 21K, 18K and 14K per gram by country, plus silver by purity. Free, no sign-up, phone-friendly.
Read articleSecurity & PrivacyHash generator — MD5, SHA-256 and can you decrypt them?
Free hash generator for MD5, SHA-1, SHA-256 and SHA-512 — runs in your browser, nothing uploaded. Plus the honest answer: can a hash be decrypted?
Read articleImage ConverterHEIC to JPG, PNG or WebP — open iPhone photos anywhere
Convert HEIC to JPG, PNG or WebP free in your browser — iPhone photos are never uploaded. No sign-up, no caps: batch a whole camera roll at once.
Read articleImage ConverterImage converter — change any image format in your browser
Convert images between PNG, JPG, WebP, AVIF, HEIC and more with a free image converter that runs in your browser — nothing uploaded, no sign-up, no limits.
Read articleMedia & FunImage editor online — crop, filter and annotate free
Edit photos with a free image editor online — crop, rotate, resize, add text, filters and watermark in your browser. No sign-up, nothing is uploaded.
Read articleCodes & GeneratorsImage to text — free OCR in English and Arabic
Convert an image to text with free OCR in English and Arabic — right in your browser, nothing uploaded. Copy text from any photo or screenshot in seconds.
Read articleNetworkingInternet speed test — download, upload, ping and jitter
Run a free internet speed test in your browser — download, upload, ping and jitter in one run, no app or sign-up — and learn what the numbers mean.
Read articleDocuments & PDFJPG to PDF & PDF to JPG — convert both ways free
Convert JPG to PDF and PDF back to JPG or PNG free in your browser — multiple photos into one PDF, no upload, no sign-up, no watermark. Works on your phone.
Read articleEditorsJSON formatter — validate, fix and beautify JSON
Format, validate and minify JSON online free with sorted keys and clear line-and-column errors. Runs in your browser — your data never leaves it.
Read articleEditorsMarkdown editor online — plus HTML and rich text editors
A free Markdown editor online with live preview, plus HTML and rich text editors — write, preview and export .md or HTML in your browser, nothing uploaded.
Read articleDocuments & PDFMerge PDF files free — combine PDFs without uploading
Merge PDF files free, right in your browser: add files, drag to reorder, combine into one PDF. No upload, no sign-up, no watermark — phone or desktop.
Read articleNetworkingSignal, ports & traceroute — pro network apps for phones
A free signal strength app reading real dBm, plus a port scanner and traceroute for your phone — with free browser tools for ping and speed test.
Read articleText & ProductivityOnline notepad & secure notes — private notes, no account
A free online notepad that autosaves in your browser, plus PIN-locked secure notes — no account, nothing uploaded, your notes stay on your device.
Read articleText & ProductivityOnline timer & stopwatch — countdowns, laps and alarms
Set a free online timer with a real alarm or run a millisecond stopwatch with laps — no sign-up, works in your browser and on your phone.
Read articleSecurity & PrivacyPassword generator — strong random passwords explained
How a password generator makes truly random passwords, why length beats complexity, and how to create a strong one free — on your device, nothing uploaded.
Read articleDocuments & PDFPDF to Markdown — convert PDFs to clean MD files
Convert PDF to Markdown free in your browser — headings, lists and paragraphs detected automatically, nothing uploaded. Get a clean .md file in seconds.
Read articleCalculators & ConvertersPercentage calculator — discounts, tips and % change
Free percentage calculator guide: find % of a number, take 20% off a price, reverse a discount and split the tip — with worked examples you can copy.
Read articleMeasurementPhone measuring apps — ruler, level & AR measure
Turn your phone into a ruler, spirit level, protractor and AR tape measure — free measuring apps for Android and iPhone, with honest accuracy notes.
Read articleDevice ToolsPhone utility tools — battery, storage, flashlight & more
Phone utility tools all in one: check your device specs online free, plus battery health, storage, sensor tests, flashlight, mirror and magnifier — no sign-up.
Read articleSecurity & PrivacyPrivate browser & app lock — real phone privacy
A private browser app with no history, cookies or cache, plus an app lock with PIN or fingerprint — free in the Carbide toolkit for Android and iOS.
Read articleText & ProductivityRandom generators — numbers, dice, lorem ipsum and UUIDs
Random number generator plus dice, coin flips, lorem ipsum text and bulk v4 UUIDs — free, instant and private, right in your browser.
Read articleMedia & FunRemove background from image — free, nothing uploaded
Remove the background from an image free, right in your browser — nothing uploaded, no sign-up, no credit limits. Export a transparent PNG in seconds.
Read articleCodes & GeneratorsScanner apps — QR, barcode and document scanning
A free document scanner app, QR reader and barcode scanner in one toolkit — no watermark, no cloud, and your scans stay on your phone.
Read articleMeasurementDecibel, vibration & heart rate — phone sensor meters
Free decibel meter, vibration seismograph and camera heart rate — measure sound, motion and pulse with your phone's sensors. Nothing recorded or uploaded.
Read articleNetworkingSubnet calculator — CIDR, masks and hosts cheat sheet
Free subnet calculator plus a CIDR cheat sheet: masks and host counts from /8 to /30, a worked example and network vs broadcast — all in your browser.
Read articleMedia & FunTrim video online & record voice — free browser studio
Trim video online free — no watermark, no upload. Compress for WhatsApp, convert to GIF, extract MP3 audio and record voice memos in your browser.
Read articleCalculators & ConvertersUnit converter — cm to inches, kg to lbs and more
Free unit converter for cm to inches, kg to lbs, °C to °F and 200+ more units — instant, in your browser, no sign-up. Plus the exact factors cheat sheet.
Read articleImage ConverterWebP to PNG or JPG (and back) — convert WebP images free
Convert WebP to PNG or JPG free in your browser — nothing uploaded. Keep transparency with PNG, get smaller JPGs, or convert back to WebP for faster pages.
Read articleNetworkingWhat is my IP? Public vs private IP addresses explained
What is my IP? See your public IP free with city, ISP and timezone — plus public vs private IPs, IPv4 vs IPv6, and how to change your IP address.
Read articleNetworkingWho is on my WiFi? Find every device on your network
Who is on my WiFi? See every device on your network with IP, MAC and vendor — free, no account — and learn the honest way to kick Wi-Fi thieves off.
Read articleGold & SilverZakat calculator — zakat on gold, silver and cash
Free zakat calculator for gold, silver and cash — using today's live nisab, the 2.5% rate and your local currency. Neutral, private, no donation funnel.
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